diff --git a/components/service/common/component.cmake b/components/service/common/include/component.cmake
similarity index 100%
rename from components/service/common/component.cmake
rename to components/service/common/include/component.cmake
diff --git a/components/service/common/psa/error.h b/components/service/common/include/psa/error.h
similarity index 100%
rename from components/service/common/psa/error.h
rename to components/service/common/include/psa/error.h
diff --git a/components/service/crypto/client/psa/component.cmake b/components/service/crypto/client/psa/component.cmake
new file mode 100644
index 0000000..8d7fa99
--- /dev/null
+++ b/components/service/crypto/client/psa/component.cmake
@@ -0,0 +1,24 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+if (NOT DEFINED TGT)
+	message(FATAL_ERROR "mandatory parameter TGT is not defined.")
+endif()
+
+target_sources(${TGT} PRIVATE
+	"${CMAKE_CURRENT_LIST_DIR}/psa_crypto_client.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_crypto_client_key_attributes.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_asymmetric_decrypt.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_asymmetric_encrypt.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_destroy_key.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_export_key.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_export_public_key.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_generate_key.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_generate_random.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_import_key.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_sign_hash.c"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_verify_hash.c"
+	)
diff --git a/components/service/crypto/client/psa/psa_asymmetric_decrypt.c b/components/service/crypto/client/psa/psa_asymmetric_decrypt.c
new file mode 100644
index 0000000..a997051
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_asymmetric_decrypt.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/asymmetric_decrypt.h>
+#include <common/tlv/tlv.h>
+
+
+psa_status_t psa_asymmetric_decrypt(psa_key_id_t id, psa_algorithm_t alg,
+                        const uint8_t *input, size_t input_length,
+                        const uint8_t *salt, size_t salt_length,
+                        uint8_t *output, size_t output_size, size_t *output_length)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_asymmetric_decrypt_in req_msg;
+    size_t req_fixed_len = sizeof(struct ts_crypto_asymmetric_decrypt_in);
+    size_t req_len = req_fixed_len;
+
+    *output_length = 0;  /* For failure case */
+
+    req_msg.id = id;
+    req_msg.alg = alg;
+
+    /* Mandatory parameter */
+    struct tlv_record ciphertext_record;
+    ciphertext_record.tag = TS_CRYPTO_ASYMMETRIC_DECRYPT_IN_TAG_CIPHERTEXT;
+    ciphertext_record.length = input_length;
+    ciphertext_record.value = input;
+    req_len += tlv_required_space(ciphertext_record.length);
+
+    /* Optional parameter */
+    struct tlv_record salt_record;
+    salt_record.tag = TS_CRYPTO_ASYMMETRIC_DECRYPT_IN_TAG_SALT;
+    salt_record.length = (salt) ? salt_length : 0;
+    salt_record.value = salt;
+    if (salt) req_len += tlv_required_space(salt_record.length);
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+        struct tlv_iterator req_iter;
+
+        memcpy(req_buf, &req_msg, req_fixed_len);
+
+        tlv_iterator_begin(&req_iter, &req_buf[req_fixed_len], req_len - req_fixed_len);
+        tlv_encode(&req_iter, &ciphertext_record);
+        if (salt) tlv_encode(&req_iter, &salt_record);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                    TS_CRYPTO_OPCODE_ASYMMETRIC_DECRYPT, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) {
+
+            psa_status = opstatus;
+
+            if (psa_status == PSA_SUCCESS) {
+
+                struct tlv_const_iterator resp_iter;
+                struct tlv_record decoded_record;
+                tlv_const_iterator_begin(&resp_iter, resp_buf, resp_len);
+
+                if (tlv_find_decode(&resp_iter,
+                    TS_CRYPTO_ASYMMETRIC_DECRYPT_OUT_TAG_PLAINTEXT, &decoded_record)) {
+
+                    if (decoded_record.length <= output_size) {
+
+                        memcpy(output, decoded_record.value, decoded_record.length);
+                        *output_length = decoded_record.length;
+                    }
+                    else {
+                        /* Provided buffer is too small */
+                        psa_status = PSA_ERROR_BUFFER_TOO_SMALL;
+                    }
+                }
+                else {
+                    /* Mandatory response parameter missing */
+                    psa_status = PSA_ERROR_GENERIC_ERROR;
+                }
+            }
+        }
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_asymmetric_encrypt.c b/components/service/crypto/client/psa/psa_asymmetric_encrypt.c
new file mode 100644
index 0000000..881ef7b
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_asymmetric_encrypt.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/asymmetric_encrypt.h>
+#include <common/tlv/tlv.h>
+
+
+psa_status_t psa_asymmetric_encrypt(psa_key_id_t id, psa_algorithm_t alg,
+                        const uint8_t *input, size_t input_length,
+                        const uint8_t *salt, size_t salt_length,
+                        uint8_t *output, size_t output_size, size_t *output_length)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_asymmetric_encrypt_in req_msg;
+    size_t req_fixed_len = sizeof(struct ts_crypto_asymmetric_encrypt_in);
+    size_t req_len = req_fixed_len;
+
+    *output_length = 0;  /* For failure case */
+
+    req_msg.id = id;
+    req_msg.alg = alg;
+
+    /* Mandatory parameter */
+    struct tlv_record plaintext_record;
+    plaintext_record.tag = TS_CRYPTO_ASYMMETRIC_ENCRYPT_IN_TAG_PLAINTEXT;
+    plaintext_record.length = input_length;
+    plaintext_record.value = input;
+    req_len += tlv_required_space(plaintext_record.length);
+
+    /* Optional parameter */
+    struct tlv_record salt_record;
+    salt_record.tag = TS_CRYPTO_ASYMMETRIC_ENCRYPT_IN_TAG_SALT;
+    salt_record.length = (salt) ? salt_length : 0;
+    salt_record.value = salt;
+    if (salt) req_len += tlv_required_space(salt_record.length);
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus = PSA_ERROR_GENERIC_ERROR;
+        struct tlv_iterator req_iter;
+
+        memcpy(req_buf, &req_msg, req_fixed_len);
+
+        tlv_iterator_begin(&req_iter, &req_buf[req_fixed_len], req_len - req_fixed_len);
+        tlv_encode(&req_iter, &plaintext_record);
+        if (salt) tlv_encode(&req_iter, &salt_record);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                    TS_CRYPTO_OPCODE_ASYMMETRIC_ENCRYPT, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) {
+
+            psa_status = opstatus;
+
+            if (psa_status == PSA_SUCCESS) {
+
+                struct tlv_const_iterator resp_iter;
+                struct tlv_record decoded_record;
+                tlv_const_iterator_begin(&resp_iter, resp_buf, resp_len);
+
+                if (tlv_find_decode(&resp_iter,
+                        TS_CRYPTO_ASYMMETRIC_ENCRYPT_OUT_TAG_CIPHERTEXT, &decoded_record)) {
+
+                    if (decoded_record.length <= output_size) {
+
+                        memcpy(output, decoded_record.value, decoded_record.length);
+                        *output_length = decoded_record.length;
+                    }
+                    else {
+                        /* Provided buffer is too small */
+                        psa_status = PSA_ERROR_BUFFER_TOO_SMALL;
+                    }
+                }
+                else {
+                    /* Mandatory response parameter missing */
+                    psa_status = PSA_ERROR_GENERIC_ERROR;
+                }
+            }
+        }
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_crypto_client.c b/components/service/crypto/client/psa/psa_crypto_client.c
new file mode 100644
index 0000000..41c53b3
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_crypto_client.c
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stddef.h>
+#include "psa_crypto_client.h"
+
+/* The singleton psa_crypto_client state */
+struct psa_crypto_client psa_crypto_client_instance;
+
+psa_status_t psa_crypto_client_init(struct rpc_caller *caller)
+{
+    psa_crypto_client_instance.caller = caller;
+    return PSA_SUCCESS;
+}
+
+void psa_crypto_client_deinit(void)
+{
+    psa_crypto_client_instance.caller = NULL;
+}
+
+int psa_crypto_client_rpc_status(void)
+{
+    return psa_crypto_client_instance.rpc_status;
+}
diff --git a/components/service/crypto/client/psa/psa_crypto_client.h b/components/service/crypto/client/psa/psa_crypto_client.h
new file mode 100644
index 0000000..e161e8b
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_crypto_client.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PSA_CRYPTO_CLIENT_H
+#define PSA_CRYPTO_CLIENT_H
+
+#include <psa/error.h>
+#include <rpc_caller.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief      The singleton psa_crypto_client state
+ *
+ * The psa crypto C API assumes a single instance of the backend provider.  This
+ * structure defines the state used by the psa_cryypto_client that communicates
+ * with a remote provider using the provided rpc caller.
+ */
+struct psa_crypto_client
+{
+    struct rpc_caller *caller;
+    int rpc_status;
+};
+
+extern struct psa_crypto_client psa_crypto_client_instance;
+
+/**
+ * @brief      Initialises the single psa crypto client
+ *
+ * Assignes a concrete rpc caller to the psa crypto client and performs any other
+ * initialisation needed.
+ *
+ * @param[in]  caller An initailised rpc_caller
+ *
+ * @return     A status indicating the success/failure of the operation
+ */
+psa_status_t psa_crypto_client_init(struct rpc_caller *caller);
+
+/**
+ * @brief      De-initialises the single psa crypto client
+ *
+ * Performs clean-up when the crypto client is no longer needed
+ */
+void psa_crypto_client_deinit(void);
+
+/**
+ * @brief      Get most recent rpc status
+ *
+ * Returns the error status for the most recent RPC operation
+ *
+ * @return     RPC status code
+ */
+int psa_crypto_client_rpc_status(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PSA_CRYPTO_CLIENT_H */
diff --git a/components/service/crypto/client/psa/psa_crypto_client_key_attributes.c b/components/service/crypto/client/psa/psa_crypto_client_key_attributes.c
new file mode 100644
index 0000000..3c69b28
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_crypto_client_key_attributes.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "psa_crypto_client_key_attributes.h"
+
+
+void psa_crypto_client_translate_key_attributes(struct ts_crypto_key_attributes *proto_attributes,
+                            const psa_key_attributes_t *psa_attributes)
+{
+    proto_attributes->type = psa_get_key_type(psa_attributes);
+    proto_attributes->key_bits = psa_get_key_bits(psa_attributes);
+    proto_attributes->lifetime = psa_get_key_lifetime(psa_attributes);
+    proto_attributes->id = psa_get_key_id(psa_attributes);
+
+    proto_attributes->policy.usage = psa_get_key_usage_flags(psa_attributes);
+    proto_attributes->policy.alg = psa_get_key_algorithm(psa_attributes);
+ }
+
+/*
+ * The key attributes structure used on the client API doesn't
+ * contain an dynamically allocated members so resetting it is
+ * a nop.
+ */
+void psa_reset_key_attributes(psa_key_attributes_t *attributes)
+{
+    /* Nothing to free for client structure */
+}
diff --git a/components/service/crypto/client/psa/psa_crypto_client_key_attributes.h b/components/service/crypto/client/psa/psa_crypto_client_key_attributes.h
new file mode 100644
index 0000000..e9519bb
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_crypto_client_key_attributes.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PSA_CRYPTO_CLIENT_KEY_ATTRIBUTES_H
+#define PSA_CRYPTO_CLIENT_KEY_ATTRIBUTES_H
+
+#include <psa/crypto.h>
+#include <protocols/service/crypto/packed-c/key_attributes.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief      Translate psa key attributes to packed-c serialization
+ *
+ * @param[out]  proto_attributes    The serialized key attributes
+ * @param[in]   psa_attributes      psa key attributes from crypto api
+ */
+void psa_crypto_client_translate_key_attributes(
+                    struct ts_crypto_key_attributes *proto_attributes,
+                    const psa_key_attributes_t *psa_attributes);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PSA_CRYPTO_CLIENT_KEY_ATTRIBUTES_H */
diff --git a/components/service/crypto/client/psa/psa_destroy_key.c b/components/service/crypto/client/psa/psa_destroy_key.c
new file mode 100644
index 0000000..62fac40
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_destroy_key.c
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/destroy_key.h>
+
+
+psa_status_t psa_destroy_key(psa_key_id_t id)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_destroy_key_in req_msg;
+    size_t req_len = sizeof(struct ts_crypto_destroy_key_in);
+
+    req_msg.id = id;
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+
+        memcpy(req_buf, &req_msg, req_len);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                        TS_CRYPTO_OPCODE_DESTROY_KEY, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) psa_status = opstatus;
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_export_key.c b/components/service/crypto/client/psa/psa_export_key.c
new file mode 100644
index 0000000..3e71a05
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_export_key.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/export_key.h>
+#include <protocols/service/crypto/packed-c/export_public_key.h>
+#include <common/tlv/tlv.h>
+
+
+psa_status_t psa_export_key(psa_key_id_t id,
+                        uint8_t *data, size_t data_size,
+                        size_t *data_length)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_export_key_in req_msg;
+    size_t req_len = sizeof(struct ts_crypto_export_key_in);
+
+    req_msg.id = id;
+
+    *data_length = 0; /* For failure case */
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+
+        memcpy(req_buf, &req_msg, req_len);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                    TS_CRYPTO_OPCODE_EXPORT_KEY, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) {
+
+            psa_status = opstatus;
+
+            if (psa_status == PSA_SUCCESS) {
+
+                struct tlv_const_iterator resp_iter;
+                struct tlv_record decoded_record;
+                tlv_const_iterator_begin(&resp_iter, resp_buf, resp_len);
+
+                if (tlv_find_decode(&resp_iter,
+                        TS_CRYPTO_EXPORT_KEY_OUT_TAG_DATA, &decoded_record)) {
+
+                    if (decoded_record.length <= data_size) {
+
+                        memcpy(data, decoded_record.value, decoded_record.length);
+                        *data_length = decoded_record.length;
+                    }
+                    else {
+                        /* Provided buffer is too small */
+                        psa_status = PSA_ERROR_BUFFER_TOO_SMALL;
+                    }
+                }
+                else {
+                    /* Mandatory response parameter missing */
+                    psa_status = PSA_ERROR_GENERIC_ERROR;
+                }
+            }
+        }
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_export_public_key.c b/components/service/crypto/client/psa/psa_export_public_key.c
new file mode 100644
index 0000000..150a752
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_export_public_key.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/export_public_key.h>
+#include <common/tlv/tlv.h>
+
+
+psa_status_t psa_export_public_key(psa_key_id_t id,
+                                uint8_t *data, size_t data_size, size_t *data_length)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_export_public_key_in req_msg;
+    size_t req_len = sizeof(struct ts_crypto_export_public_key_in);
+
+    req_msg.id = id;
+
+    *data_length = 0; /* For failure case */
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+
+        memcpy(req_buf, &req_msg, req_len);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                TS_CRYPTO_OPCODE_EXPORT_PUBLIC_KEY, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) {
+
+            psa_status = opstatus;
+
+            if (psa_status == PSA_SUCCESS) {
+
+                struct tlv_const_iterator resp_iter;
+                struct tlv_record decoded_record;
+                tlv_const_iterator_begin(&resp_iter, resp_buf, resp_len);
+
+                if (tlv_find_decode(&resp_iter,
+                        TS_CRYPTO_EXPORT_PUBLIC_KEY_OUT_TAG_DATA, &decoded_record)) {
+
+                    if (decoded_record.length <= data_size) {
+
+                        memcpy(data, decoded_record.value, decoded_record.length);
+                        *data_length = decoded_record.length;
+                    }
+                    else {
+                        /* Provided buffer is too small */
+                        psa_status = PSA_ERROR_BUFFER_TOO_SMALL;
+                    }
+                }
+                else {
+                    /* Mandatory response parameter missing */
+                    psa_status = PSA_ERROR_GENERIC_ERROR;
+                }
+            }
+        }
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_generate_key.c b/components/service/crypto/client/psa/psa_generate_key.c
new file mode 100644
index 0000000..eb94b8a
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_generate_key.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include "psa_crypto_client_key_attributes.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/key_attributes.h>
+#include <protocols/service/crypto/packed-c/generate_key.h>
+
+
+psa_status_t psa_generate_key(const psa_key_attributes_t *attributes, psa_key_id_t *id)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_generate_key_in req_msg;
+    size_t req_len = sizeof(struct ts_crypto_generate_key_in);
+
+    psa_crypto_client_translate_key_attributes(&req_msg.attributes, attributes);
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+
+        memcpy(req_buf, &req_msg, req_len);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                        TS_CRYPTO_OPCODE_GENERATE_KEY, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) {
+
+            psa_status = opstatus;
+
+            if (psa_status == PSA_SUCCESS) {
+
+                if (resp_len >= sizeof(struct ts_crypto_generate_key_out)) {
+
+                    struct ts_crypto_generate_key_out resp_msg;
+                    memcpy(&resp_msg, resp_buf, sizeof(struct ts_crypto_generate_key_out));
+                    *id = resp_msg.id;
+                }
+                else {
+                    /* Failed to decode response message */
+                    psa_status = PSA_ERROR_GENERIC_ERROR;
+                }
+            }
+        }
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_generate_random.c b/components/service/crypto/client/psa/psa_generate_random.c
new file mode 100644
index 0000000..25fdbe2
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_generate_random.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include "psa_crypto_client.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/generate_random.h>
+#include <common/tlv/tlv.h>
+
+psa_status_t psa_generate_random(uint8_t *output, size_t output_size)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_generate_random_in req_msg;
+    size_t req_len = sizeof(struct ts_crypto_generate_random_in);
+
+    req_msg.size = output_size;
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+
+        memcpy(req_buf, &req_msg, req_len);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                    TS_CRYPTO_OPCODE_GENERATE_RANDOM, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) {
+
+            psa_status = opstatus;
+
+            if (psa_status == PSA_SUCCESS) {
+
+                struct tlv_const_iterator resp_iter;
+                struct tlv_record decoded_record;
+                tlv_const_iterator_begin(&resp_iter, resp_buf, resp_len);
+
+                if (tlv_find_decode(&resp_iter,
+                            TS_CRYPTO_GENERATE_RANDOM_OUT_TAG_RANDOM_BYTES, &decoded_record)) {
+
+                    if (decoded_record.length <= output_size) {
+
+                        memcpy(output, decoded_record.value, decoded_record.length);
+                    }
+                    else {
+                        /* Provided buffer is too small */
+                        psa_status = PSA_ERROR_BUFFER_TOO_SMALL;
+                    }
+                }
+                else {
+                    /* Mandatory response parameter missing */
+                    psa_status = PSA_ERROR_GENERIC_ERROR;
+                }
+            }
+        }
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_import_key.c b/components/service/crypto/client/psa/psa_import_key.c
new file mode 100644
index 0000000..34f1d01
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_import_key.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include "psa_crypto_client_key_attributes.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/key_attributes.h>
+#include <protocols/service/crypto/packed-c/import_key.h>
+#include <common/tlv/tlv.h>
+
+
+psa_status_t psa_import_key(const psa_key_attributes_t *attributes,
+                        const uint8_t *data, size_t data_length, psa_key_id_t *id)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_import_key_in req_msg;
+    size_t req_fixed_len = sizeof(struct ts_crypto_import_key_in);
+    size_t req_len = req_fixed_len + tlv_required_space(data_length);
+
+    psa_crypto_client_translate_key_attributes(&req_msg.attributes, attributes);
+
+    struct tlv_record key_record;
+    key_record.tag = TS_CRYPTO_IMPORT_KEY_IN_TAG_DATA;
+    key_record.length = data_length;
+    key_record.value = data;
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+        struct tlv_iterator req_iter;
+
+        memcpy(req_buf, &req_msg, req_fixed_len);
+
+        tlv_iterator_begin(&req_iter, &req_buf[req_fixed_len], req_len - req_fixed_len);
+        tlv_encode(&req_iter, &key_record);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                        TS_CRYPTO_OPCODE_IMPORT_KEY, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) {
+
+            psa_status = opstatus;
+
+            if (psa_status == PSA_SUCCESS) {
+
+                if (resp_len >= sizeof(struct ts_crypto_import_key_out)) {
+
+                    struct ts_crypto_import_key_out resp_msg;
+                    memcpy(&resp_msg, resp_buf, sizeof(struct ts_crypto_import_key_out));
+                    *id = resp_msg.id;
+                }
+                else {
+                    /* Failed to decode response message */
+                    psa_status = PSA_ERROR_GENERIC_ERROR;
+                }
+            }
+        }
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_sign_hash.c b/components/service/crypto/client/psa/psa_sign_hash.c
new file mode 100644
index 0000000..2c9e0c5
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_sign_hash.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/sign_hash.h>
+#include <common/tlv/tlv.h>
+
+psa_status_t psa_sign_hash(psa_key_id_t id, psa_algorithm_t alg,
+                            const uint8_t *hash, size_t hash_length,
+                            uint8_t *signature, size_t signature_size, size_t *signature_length)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_sign_hash_in req_msg;
+    size_t req_fixed_len = sizeof(struct ts_crypto_sign_hash_in);
+    size_t req_len = req_fixed_len + tlv_required_space(hash_length);
+
+    *signature_length = 0;  /* For failure case */
+
+    req_msg.id = id;
+    req_msg.alg = alg;
+
+    struct tlv_record hash_record;
+    hash_record.tag = TS_CRYPTO_SIGN_HASH_IN_TAG_HASH;
+    hash_record.length = hash_length;
+    hash_record.value = hash;
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+        struct tlv_iterator req_iter;
+
+        memcpy(req_buf, &req_msg, req_fixed_len);
+
+        tlv_iterator_begin(&req_iter, &req_buf[req_fixed_len], req_len - req_fixed_len);
+        tlv_encode(&req_iter, &hash_record);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                        TS_CRYPTO_OPCODE_SIGN_HASH, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) {
+
+            psa_status = opstatus;
+
+            if (psa_status == PSA_SUCCESS) {
+
+                struct tlv_const_iterator resp_iter;
+                struct tlv_record decoded_record;
+                tlv_const_iterator_begin(&resp_iter, resp_buf, resp_len);
+
+                if (tlv_find_decode(&resp_iter,
+                            TS_CRYPTO_SIGN_HASH_OUT_TAG_SIGNATURE, &decoded_record)) {
+
+                    if (decoded_record.length <= signature_size) {
+
+                        memcpy(signature, decoded_record.value, decoded_record.length);
+                        *signature_length = decoded_record.length;
+                    }
+                    else {
+                        /* Provided buffer is too small */
+                        psa_status = PSA_ERROR_BUFFER_TOO_SMALL;
+                    }
+                }
+                else {
+                    /* Mandatory response parameter missing */
+                    psa_status = PSA_ERROR_GENERIC_ERROR;
+                }
+            }
+        }
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/crypto/client/psa/psa_verify_hash.c b/components/service/crypto/client/psa/psa_verify_hash.c
new file mode 100644
index 0000000..66a87fd
--- /dev/null
+++ b/components/service/crypto/client/psa/psa_verify_hash.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <psa/crypto.h>
+#include "psa_crypto_client.h"
+#include <protocols/rpc/common/packed-c/status.h>
+#include <protocols/service/crypto/packed-c/opcodes.h>
+#include <protocols/service/crypto/packed-c/verify_hash.h>
+#include <common/tlv/tlv.h>
+
+
+psa_status_t psa_verify_hash(psa_key_id_t id, psa_algorithm_t alg,
+                        const uint8_t *hash, size_t hash_length,
+                        const uint8_t *signature, size_t signature_length)
+{
+    psa_status_t psa_status = PSA_ERROR_GENERIC_ERROR;
+    struct ts_crypto_verify_hash_in req_msg;
+    size_t req_fixed_len = sizeof(struct ts_crypto_verify_hash_in);
+    size_t req_len = req_fixed_len +
+        tlv_required_space(hash_length) + tlv_required_space(signature_length);
+
+    req_msg.id = id;
+    req_msg.alg = alg;
+
+    struct tlv_record hash_record;
+    hash_record.tag = TS_CRYPTO_VERIFY_HASH_IN_TAG_HASH;
+    hash_record.length = hash_length;
+    hash_record.value = hash;
+
+    struct tlv_record sig_record;
+    sig_record.tag = TS_CRYPTO_VERIFY_HASH_IN_TAG_SIGNATURE;
+    sig_record.length = signature_length;
+    sig_record.value = signature;
+
+    rpc_call_handle call_handle;
+    uint8_t *req_buf;
+
+    call_handle = rpc_caller_begin(psa_crypto_client_instance.caller, &req_buf, req_len);
+
+    if (call_handle) {
+
+        uint8_t *resp_buf;
+        size_t resp_len;
+        int opstatus;
+        struct tlv_iterator req_iter;
+
+        memcpy(req_buf, &req_msg, req_fixed_len);
+
+        tlv_iterator_begin(&req_iter, &req_buf[req_fixed_len], req_len - req_fixed_len);
+        tlv_encode(&req_iter, &hash_record);
+        tlv_encode(&req_iter, &sig_record);
+
+        psa_crypto_client_instance.rpc_status =
+            rpc_caller_invoke(psa_crypto_client_instance.caller, call_handle,
+                    TS_CRYPTO_OPCODE_VERIFY_HASH, &opstatus, &resp_buf, &resp_len);
+
+        if (psa_crypto_client_instance.rpc_status == TS_RPC_CALL_ACCEPTED) psa_status = opstatus;
+
+        rpc_caller_end(psa_crypto_client_instance.caller, call_handle);
+    }
+
+    return psa_status;
+}
diff --git a/components/service/common/component.cmake b/components/service/crypto/include/component.cmake
similarity index 100%
copy from components/service/common/component.cmake
copy to components/service/crypto/include/component.cmake
diff --git a/components/service/crypto/include/psa/crypto.h b/components/service/crypto/include/psa/crypto.h
new file mode 100644
index 0000000..8d03b75
--- /dev/null
+++ b/components/service/crypto/include/psa/crypto.h
@@ -0,0 +1,3758 @@
+/*
+ * Copyright (c) 2018-2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+/**
+ * \file psa/crypto.h
+ * \brief Platform Security Architecture cryptography module
+ */
+
+#ifndef PSA_CRYPTO_H
+#define PSA_CRYPTO_H
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* The file "crypto_types.h" declares types that encode errors,
+ * algorithms, key types, policies, etc. */
+#include "psa/crypto_types.h"
+
+/** \defgroup version API version
+ * @{
+ */
+
+/**
+ * The major version of this implementation of the PSA Crypto API
+ */
+#define PSA_CRYPTO_API_VERSION_MAJOR 1
+
+/**
+ * The minor version of this implementation of the PSA Crypto API
+ */
+#define PSA_CRYPTO_API_VERSION_MINOR 0
+
+/**@}*/
+
+/* The file "crypto_values.h" declares macros to build and analyze values
+ * of integral types defined in "crypto_types.h". */
+#include "psa/crypto_values.h"
+
+/** \defgroup initialization Library initialization
+ * @{
+ */
+
+/**
+ * \brief Library initialization.
+ *
+ * Applications must call this function before calling any other
+ * function in this module.
+ *
+ * Applications may call this function more than once. Once a call
+ * succeeds, subsequent calls are guaranteed to succeed.
+ *
+ * If the application calls other functions before calling psa_crypto_init(),
+ * the behavior is undefined. Implementations are encouraged to either perform
+ * the operation as if the library had been initialized or to return
+ * #PSA_ERROR_BAD_STATE or some other applicable error. In particular,
+ * implementations should not return a success status if the lack of
+ * initialization may have security implications, for example due to improper
+ * seeding of the random number generator.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_INSUFFICIENT_STORAGE
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_DATA_INVALID
+ * \retval #PSA_ERROR_DATA_CORRUPT
+ */
+psa_status_t psa_crypto_init(void);
+
+/**@}*/
+
+/** \addtogroup attributes
+ * @{
+ */
+
+/** \def PSA_KEY_ATTRIBUTES_INIT
+ *
+ * This macro returns a suitable initializer for a key attribute structure
+ * of type #psa_key_attributes_t.
+ */
+#ifdef __DOXYGEN_ONLY__
+/* This is an example definition for documentation purposes.
+ * Implementations should define a suitable value in `crypto_struct.h`.
+ */
+#define PSA_KEY_ATTRIBUTES_INIT {0}
+#endif
+
+/** Return an initial value for a key attributes structure.
+ */
+static psa_key_attributes_t psa_key_attributes_init(void);
+
+/** Declare a key as persistent and set its key identifier.
+ *
+ * If the attribute structure currently declares the key as volatile (which
+ * is the default content of an attribute structure), this function sets
+ * the lifetime attribute to #PSA_KEY_LIFETIME_PERSISTENT.
+ *
+ * This function does not access storage, it merely stores the given
+ * value in the structure.
+ * The persistent key will be written to storage when the attribute
+ * structure is passed to a key creation function such as
+ * psa_import_key(), psa_generate_key(),
+ * psa_key_derivation_output_key() or psa_copy_key().
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate each of its arguments exactly once.
+ *
+ * \param[out] attributes  The attribute structure to write to.
+ * \param key              The persistent identifier for the key.
+ */
+static void psa_set_key_id( psa_key_attributes_t *attributes,
+                            psa_key_id_t key );
+
+#ifdef MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER
+/** Set the owner identifier of a key.
+ *
+ * When key identifiers encode key owner identifiers, psa_set_key_id() does
+ * not allow to define in key attributes the owner of volatile keys as
+ * psa_set_key_id() enforces the key to be persistent.
+ *
+ * This function allows to set in key attributes the owner identifier of a
+ * key. It is intended to be used for volatile keys. For persistent keys,
+ * it is recommended to use the PSA Cryptography API psa_set_key_id() to define
+ * the owner of a key.
+ *
+ * \param[out] attributes  The attribute structure to write to.
+ * \param owner_id         The key owner identifier.
+ */
+static void mbedtls_set_key_owner_id( psa_key_attributes_t *attributes,
+                                      mbedtls_key_owner_id_t owner_id );
+#endif
+
+/** Set the location of a persistent key.
+ *
+ * To make a key persistent, you must give it a persistent key identifier
+ * with psa_set_key_id(). By default, a key that has a persistent identifier
+ * is stored in the default storage area identifier by
+ * #PSA_KEY_LIFETIME_PERSISTENT. Call this function to choose a storage
+ * area, or to explicitly declare the key as volatile.
+ *
+ * This function does not access storage, it merely stores the given
+ * value in the structure.
+ * The persistent key will be written to storage when the attribute
+ * structure is passed to a key creation function such as
+ * psa_import_key(), psa_generate_key(),
+ * psa_key_derivation_output_key() or psa_copy_key().
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate each of its arguments exactly once.
+ *
+ * \param[out] attributes       The attribute structure to write to.
+ * \param lifetime              The lifetime for the key.
+ *                              If this is #PSA_KEY_LIFETIME_VOLATILE, the
+ *                              key will be volatile, and the key identifier
+ *                              attribute is reset to 0.
+ */
+static void psa_set_key_lifetime(psa_key_attributes_t *attributes,
+                                 psa_key_lifetime_t lifetime);
+
+/** Retrieve the key identifier from key attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate its argument exactly once.
+ *
+ * \param[in] attributes        The key attribute structure to query.
+ *
+ * \return The persistent identifier stored in the attribute structure.
+ *         This value is unspecified if the attribute structure declares
+ *         the key as volatile.
+ */
+static psa_key_id_t psa_get_key_id(
+    const psa_key_attributes_t *attributes);
+
+/** Retrieve the lifetime from key attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate its argument exactly once.
+ *
+ * \param[in] attributes        The key attribute structure to query.
+ *
+ * \return The lifetime value stored in the attribute structure.
+ */
+static psa_key_lifetime_t psa_get_key_lifetime(
+    const psa_key_attributes_t *attributes);
+
+/** Declare usage flags for a key.
+ *
+ * Usage flags are part of a key's usage policy. They encode what
+ * kind of operations are permitted on the key. For more details,
+ * refer to the documentation of the type #psa_key_usage_t.
+ *
+ * This function overwrites any usage flags
+ * previously set in \p attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate each of its arguments exactly once.
+ *
+ * \param[out] attributes       The attribute structure to write to.
+ * \param usage_flags           The usage flags to write.
+ */
+static void psa_set_key_usage_flags(psa_key_attributes_t *attributes,
+                                    psa_key_usage_t usage_flags);
+
+/** Retrieve the usage flags from key attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate its argument exactly once.
+ *
+ * \param[in] attributes        The key attribute structure to query.
+ *
+ * \return The usage flags stored in the attribute structure.
+ */
+static psa_key_usage_t psa_get_key_usage_flags(
+    const psa_key_attributes_t *attributes);
+
+/** Declare the permitted algorithm policy for a key.
+ *
+ * The permitted algorithm policy of a key encodes which algorithm or
+ * algorithms are permitted to be used with this key. The following
+ * algorithm policies are supported:
+ * - 0 does not allow any cryptographic operation with the key. The key
+ *   may be used for non-cryptographic actions such as exporting (if
+ *   permitted by the usage flags).
+ * - An algorithm value permits this particular algorithm.
+ * - An algorithm wildcard built from #PSA_ALG_ANY_HASH allows the specified
+ *   signature scheme with any hash algorithm.
+ * - An algorithm built from #PSA_ALG_AT_LEAST_THIS_LENGTH_MAC allows
+ *   any MAC algorithm from the same base class (e.g. CMAC) which
+ *   generates/verifies a MAC length greater than or equal to the length
+ *   encoded in the wildcard algorithm.
+ * - An algorithm built from #PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG
+ *   allows any AEAD algorithm from the same base class (e.g. CCM) which
+ *   generates/verifies a tag length greater than or equal to the length
+ *   encoded in the wildcard algorithm.
+ *
+ * This function overwrites any algorithm policy
+ * previously set in \p attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate each of its arguments exactly once.
+ *
+ * \param[out] attributes       The attribute structure to write to.
+ * \param alg                   The permitted algorithm policy to write.
+ */
+static void psa_set_key_algorithm(psa_key_attributes_t *attributes,
+                                  psa_algorithm_t alg);
+
+
+/** Retrieve the algorithm policy from key attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate its argument exactly once.
+ *
+ * \param[in] attributes        The key attribute structure to query.
+ *
+ * \return The algorithm stored in the attribute structure.
+ */
+static psa_algorithm_t psa_get_key_algorithm(
+    const psa_key_attributes_t *attributes);
+
+/** Declare the type of a key.
+ *
+ * This function overwrites any key type
+ * previously set in \p attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate each of its arguments exactly once.
+ *
+ * \param[out] attributes       The attribute structure to write to.
+ * \param type                  The key type to write.
+ *                              If this is 0, the key type in \p attributes
+ *                              becomes unspecified.
+ */
+static void psa_set_key_type(psa_key_attributes_t *attributes,
+                             psa_key_type_t type);
+
+
+/** Declare the size of a key.
+ *
+ * This function overwrites any key size previously set in \p attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate each of its arguments exactly once.
+ *
+ * \param[out] attributes       The attribute structure to write to.
+ * \param bits                  The key size in bits.
+ *                              If this is 0, the key size in \p attributes
+ *                              becomes unspecified. Keys of size 0 are
+ *                              not supported.
+ */
+static void psa_set_key_bits(psa_key_attributes_t *attributes,
+                             size_t bits);
+
+/** Retrieve the key type from key attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate its argument exactly once.
+ *
+ * \param[in] attributes        The key attribute structure to query.
+ *
+ * \return The key type stored in the attribute structure.
+ */
+static psa_key_type_t psa_get_key_type(const psa_key_attributes_t *attributes);
+
+/** Retrieve the key size from key attributes.
+ *
+ * This function may be declared as `static` (i.e. without external
+ * linkage). This function may be provided as a function-like macro,
+ * but in this case it must evaluate its argument exactly once.
+ *
+ * \param[in] attributes        The key attribute structure to query.
+ *
+ * \return The key size stored in the attribute structure, in bits.
+ */
+static size_t psa_get_key_bits(const psa_key_attributes_t *attributes);
+
+/** Retrieve the attributes of a key.
+ *
+ * This function first resets the attribute structure as with
+ * psa_reset_key_attributes(). It then copies the attributes of
+ * the given key into the given attribute structure.
+ *
+ * \note This function may allocate memory or other resources.
+ *       Once you have called this function on an attribute structure,
+ *       you must call psa_reset_key_attributes() to free these resources.
+ *
+ * \param[in] key               Identifier of the key to query.
+ * \param[in,out] attributes    On success, the attributes of the key.
+ *                              On failure, equivalent to a
+ *                              freshly-initialized structure.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_DATA_CORRUPT
+ * \retval #PSA_ERROR_DATA_INVALID
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_get_key_attributes(psa_key_id_t key,
+                                    psa_key_attributes_t *attributes);
+
+/** Reset a key attribute structure to a freshly initialized state.
+ *
+ * You must initialize the attribute structure as described in the
+ * documentation of the type #psa_key_attributes_t before calling this
+ * function. Once the structure has been initialized, you may call this
+ * function at any time.
+ *
+ * This function frees any auxiliary resources that the structure
+ * may contain.
+ *
+ * \param[in,out] attributes    The attribute structure to reset.
+ */
+void psa_reset_key_attributes(psa_key_attributes_t *attributes);
+
+/**@}*/
+
+/** \defgroup key_management Key management
+ * @{
+ */
+
+/** Remove non-essential copies of key material from memory.
+ *
+ * If the key identifier designates a volatile key, this functions does not do
+ * anything and returns successfully.
+ *
+ * If the key identifier designates a persistent key, then this function will
+ * free all resources associated with the key in volatile memory. The key
+ * data in persistent storage is not affected and the key can still be used.
+ *
+ * \param key Identifier of the key to purge.
+ *
+ * \retval #PSA_SUCCESS
+ *         The key material will have been removed from memory if it is not
+ *         currently required.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not a valid key identifier.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_purge_key(psa_key_id_t key);
+
+/** Make a copy of a key.
+ *
+ * Copy key material from one location to another.
+ *
+ * This function is primarily useful to copy a key from one location
+ * to another, since it populates a key using the material from
+ * another key which may have a different lifetime.
+ *
+ * This function may be used to share a key with a different party,
+ * subject to implementation-defined restrictions on key sharing.
+ *
+ * The policy on the source key must have the usage flag
+ * #PSA_KEY_USAGE_COPY set.
+ * This flag is sufficient to permit the copy if the key has the lifetime
+ * #PSA_KEY_LIFETIME_VOLATILE or #PSA_KEY_LIFETIME_PERSISTENT.
+ * Some secure elements do not provide a way to copy a key without
+ * making it extractable from the secure element. If a key is located
+ * in such a secure element, then the key must have both usage flags
+ * #PSA_KEY_USAGE_COPY and #PSA_KEY_USAGE_EXPORT in order to make
+ * a copy of the key outside the secure element.
+ *
+ * The resulting key may only be used in a way that conforms to
+ * both the policy of the original key and the policy specified in
+ * the \p attributes parameter:
+ * - The usage flags on the resulting key are the bitwise-and of the
+ *   usage flags on the source policy and the usage flags in \p attributes.
+ * - If both allow the same algorithm or wildcard-based
+ *   algorithm policy, the resulting key has the same algorithm policy.
+ * - If either of the policies allows an algorithm and the other policy
+ *   allows a wildcard-based algorithm policy that includes this algorithm,
+ *   the resulting key allows the same algorithm.
+ * - If the policies do not allow any algorithm in common, this function
+ *   fails with the status #PSA_ERROR_INVALID_ARGUMENT.
+ *
+ * The effect of this function on implementation-defined attributes is
+ * implementation-defined.
+ *
+ * \param source_key        The key to copy. It must allow the usage
+ *                          #PSA_KEY_USAGE_COPY. If a private or secret key is
+ *                          being copied outside of a secure element it must
+ *                          also allow #PSA_KEY_USAGE_EXPORT.
+ * \param[in] attributes    The attributes for the new key.
+ *                          They are used as follows:
+ *                          - The key type and size may be 0. If either is
+ *                            nonzero, it must match the corresponding
+ *                            attribute of the source key.
+ *                          - The key location (the lifetime and, for
+ *                            persistent keys, the key identifier) is
+ *                            used directly.
+ *                          - The policy constraints (usage flags and
+ *                            algorithm policy) are combined from
+ *                            the source key and \p attributes so that
+ *                            both sets of restrictions apply, as
+ *                            described in the documentation of this function.
+ * \param[out] target_key   On success, an identifier for the newly created
+ *                          key. For persistent keys, this is the key
+ *                          identifier defined in \p attributes.
+ *                          \c 0 on failure.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ *         \p source_key is invalid.
+ * \retval #PSA_ERROR_ALREADY_EXISTS
+ *         This is an attempt to create a persistent key, and there is
+ *         already a persistent key with the given identifier.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The lifetime or identifier in \p attributes are invalid.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The policy constraints on the source and specified in
+ *         \p attributes are incompatible.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p attributes specifies a key type or key size
+ *         which does not match the attributes of the source key.
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ *         The source key does not have the #PSA_KEY_USAGE_COPY usage flag.
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ *         The source key is not exportable and its lifetime does not
+ *         allow copying it to the target's lifetime.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_INSUFFICIENT_STORAGE
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_DATA_INVALID
+ * \retval #PSA_ERROR_DATA_CORRUPT
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_copy_key(psa_key_id_t source_key,
+                          const psa_key_attributes_t *attributes,
+                          psa_key_id_t *target_key);
+
+
+/**
+ * \brief Destroy a key.
+ *
+ * This function destroys a key from both volatile
+ * memory and, if applicable, non-volatile storage. Implementations shall
+ * make a best effort to ensure that that the key material cannot be recovered.
+ *
+ * This function also erases any metadata such as policies and frees
+ * resources associated with the key.
+ *
+ * If a key is currently in use in a multipart operation, then destroying the
+ * key will cause the multipart operation to fail.
+ *
+ * \param key  Identifier of the key to erase. If this is \c 0, do nothing and
+ *             return #PSA_SUCCESS.
+ *
+ * \retval #PSA_SUCCESS
+ *         \p key was a valid identifier and the key material that it
+ *         referred to has been erased. Alternatively, \p key is \c 0.
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ *         The key cannot be erased because it is
+ *         read-only, either due to a policy or due to physical restrictions.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ *         \p key is not a valid identifier nor \c 0.
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ *         There was an failure in communication with the cryptoprocessor.
+ *         The key material may still be present in the cryptoprocessor.
+ * \retval #PSA_ERROR_DATA_INVALID
+ *         This error is typically a result of either storage corruption on a
+ *         cleartext storage backend, or an attempt to read data that was
+ *         written by an incompatible version of the library.
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ *         The storage is corrupted. Implementations shall make a best effort
+ *         to erase key material even in this stage, however applications
+ *         should be aware that it may be impossible to guarantee that the
+ *         key material is not recoverable in such cases.
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ *         An unexpected condition which is not a storage corruption or
+ *         a communication failure occurred. The cryptoprocessor may have
+ *         been compromised.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_destroy_key(psa_key_id_t key);
+
+/**@}*/
+
+/** \defgroup import_export Key import and export
+ * @{
+ */
+
+/**
+ * \brief Import a key in binary format.
+ *
+ * This function supports any output from psa_export_key(). Refer to the
+ * documentation of psa_export_public_key() for the format of public keys
+ * and to the documentation of psa_export_key() for the format for
+ * other key types.
+ *
+ * The key data determines the key size. The attributes may optionally
+ * specify a key size; in this case it must match the size determined
+ * from the key data. A key size of 0 in \p attributes indicates that
+ * the key size is solely determined by the key data.
+ *
+ * Implementations must reject an attempt to import a key of size 0.
+ *
+ * This specification supports a single format for each key type.
+ * Implementations may support other formats as long as the standard
+ * format is supported. Implementations that support other formats
+ * should ensure that the formats are clearly unambiguous so as to
+ * minimize the risk that an invalid input is accidentally interpreted
+ * according to a different format.
+ *
+ * \param[in] attributes    The attributes for the new key.
+ *                          The key size is always determined from the
+ *                          \p data buffer.
+ *                          If the key size in \p attributes is nonzero,
+ *                          it must be equal to the size from \p data.
+ * \param[out] key          On success, an identifier to the newly created key.
+ *                          For persistent keys, this is the key identifier
+ *                          defined in \p attributes.
+ *                          \c 0 on failure.
+ * \param[in] data    Buffer containing the key data. The content of this
+ *                    buffer is interpreted according to the type declared
+ *                    in \p attributes.
+ *                    All implementations must support at least the format
+ *                    described in the documentation
+ *                    of psa_export_key() or psa_export_public_key() for
+ *                    the chosen type. Implementations may allow other
+ *                    formats, but should be conservative: implementations
+ *                    should err on the side of rejecting content if it
+ *                    may be erroneous (e.g. wrong type or truncated data).
+ * \param data_length Size of the \p data buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ *         If the key is persistent, the key material and the key's metadata
+ *         have been saved to persistent storage.
+ * \retval #PSA_ERROR_ALREADY_EXISTS
+ *         This is an attempt to create a persistent key, and there is
+ *         already a persistent key with the given identifier.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         The key type or key size is not supported, either by the
+ *         implementation in general or in this particular persistent location.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The key attributes, as a whole, are invalid.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The key data is not correctly formatted.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The size in \p attributes is nonzero and does not match the size
+ *         of the key data.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_INSUFFICIENT_STORAGE
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_DATA_CORRUPT
+ * \retval #PSA_ERROR_DATA_INVALID
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_import_key(const psa_key_attributes_t *attributes,
+                            const uint8_t *data,
+                            size_t data_length,
+                            psa_key_id_t *key);
+
+
+
+/**
+ * \brief Export a key in binary format.
+ *
+ * The output of this function can be passed to psa_import_key() to
+ * create an equivalent object.
+ *
+ * If the implementation of psa_import_key() supports other formats
+ * beyond the format specified here, the output from psa_export_key()
+ * must use the representation specified here, not the original
+ * representation.
+ *
+ * For standard key types, the output format is as follows:
+ *
+ * - For symmetric keys (including MAC keys), the format is the
+ *   raw bytes of the key.
+ * - For DES, the key data consists of 8 bytes. The parity bits must be
+ *   correct.
+ * - For Triple-DES, the format is the concatenation of the
+ *   two or three DES keys.
+ * - For RSA key pairs (#PSA_KEY_TYPE_RSA_KEY_PAIR), the format
+ *   is the non-encrypted DER encoding of the representation defined by
+ *   PKCS\#1 (RFC 8017) as `RSAPrivateKey`, version 0.
+ *   ```
+ *   RSAPrivateKey ::= SEQUENCE {
+ *       version             INTEGER,  -- must be 0
+ *       modulus             INTEGER,  -- n
+ *       publicExponent      INTEGER,  -- e
+ *       privateExponent     INTEGER,  -- d
+ *       prime1              INTEGER,  -- p
+ *       prime2              INTEGER,  -- q
+ *       exponent1           INTEGER,  -- d mod (p-1)
+ *       exponent2           INTEGER,  -- d mod (q-1)
+ *       coefficient         INTEGER,  -- (inverse of q) mod p
+ *   }
+ *   ```
+ * - For elliptic curve key pairs (key types for which
+ *   #PSA_KEY_TYPE_IS_ECC_KEY_PAIR is true), the format is
+ *   a representation of the private value as a `ceiling(m/8)`-byte string
+ *   where `m` is the bit size associated with the curve, i.e. the bit size
+ *   of the order of the curve's coordinate field. This byte string is
+ *   in little-endian order for Montgomery curves (curve types
+ *   `PSA_ECC_FAMILY_CURVEXXX`), and in big-endian order for Weierstrass
+ *   curves (curve types `PSA_ECC_FAMILY_SECTXXX`, `PSA_ECC_FAMILY_SECPXXX`
+ *   and `PSA_ECC_FAMILY_BRAINPOOL_PXXX`).
+ *   For Weierstrass curves, this is the content of the `privateKey` field of
+ *   the `ECPrivateKey` format defined by RFC 5915.  For Montgomery curves,
+ *   the format is defined by RFC 7748, and output is masked according to §5.
+ * - For Diffie-Hellman key exchange key pairs (key types for which
+ *   #PSA_KEY_TYPE_IS_DH_KEY_PAIR is true), the
+ *   format is the representation of the private key `x` as a big-endian byte
+ *   string. The length of the byte string is the private key size in bytes
+ *   (leading zeroes are not stripped).
+ * - For public keys (key types for which #PSA_KEY_TYPE_IS_PUBLIC_KEY is
+ *   true), the format is the same as for psa_export_public_key().
+ *
+ * The policy on the key must have the usage flag #PSA_KEY_USAGE_EXPORT set.
+ *
+ * \param key               Identifier of the key to export. It must allow the
+ *                          usage #PSA_KEY_USAGE_EXPORT, unless it is a public
+ *                          key.
+ * \param[out] data         Buffer where the key data is to be written.
+ * \param data_size         Size of the \p data buffer in bytes.
+ * \param[out] data_length  On success, the number of bytes
+ *                          that make up the key data.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ *         The key does not have the #PSA_KEY_USAGE_EXPORT flag.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p data buffer is too small. You can determine a
+ *         sufficient buffer size by calling
+ *         #PSA_EXPORT_KEY_OUTPUT_SIZE(\c type, \c bits)
+ *         where \c type is the key type
+ *         and \c bits is the key size in bits.
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_export_key(psa_key_id_t key,
+                            uint8_t *data,
+                            size_t data_size,
+                            size_t *data_length);
+
+/**
+ * \brief Export a public key or the public part of a key pair in binary format.
+ *
+ * The output of this function can be passed to psa_import_key() to
+ * create an object that is equivalent to the public key.
+ *
+ * This specification supports a single format for each key type.
+ * Implementations may support other formats as long as the standard
+ * format is supported. Implementations that support other formats
+ * should ensure that the formats are clearly unambiguous so as to
+ * minimize the risk that an invalid input is accidentally interpreted
+ * according to a different format.
+ *
+ * For standard key types, the output format is as follows:
+ * - For RSA public keys (#PSA_KEY_TYPE_RSA_PUBLIC_KEY), the DER encoding of
+ *   the representation defined by RFC 3279 &sect;2.3.1 as `RSAPublicKey`.
+ *   ```
+ *   RSAPublicKey ::= SEQUENCE {
+ *      modulus            INTEGER,    -- n
+ *      publicExponent     INTEGER  }  -- e
+ *   ```
+ * - For elliptic curve public keys (key types for which
+ *   #PSA_KEY_TYPE_IS_ECC_PUBLIC_KEY is true), the format is the uncompressed
+ *   representation defined by SEC1 &sect;2.3.3 as the content of an ECPoint.
+ *   Let `m` be the bit size associated with the curve, i.e. the bit size of
+ *   `q` for a curve over `F_q`. The representation consists of:
+ *      - The byte 0x04;
+ *      - `x_P` as a `ceiling(m/8)`-byte string, big-endian;
+ *      - `y_P` as a `ceiling(m/8)`-byte string, big-endian.
+ * - For Diffie-Hellman key exchange public keys (key types for which
+ *   #PSA_KEY_TYPE_IS_DH_PUBLIC_KEY is true),
+ *   the format is the representation of the public key `y = g^x mod p` as a
+ *   big-endian byte string. The length of the byte string is the length of the
+ *   base prime `p` in bytes.
+ *
+ * Exporting a public key object or the public part of a key pair is
+ * always permitted, regardless of the key's usage flags.
+ *
+ * \param key               Identifier of the key to export.
+ * \param[out] data         Buffer where the key data is to be written.
+ * \param data_size         Size of the \p data buffer in bytes.
+ * \param[out] data_length  On success, the number of bytes
+ *                          that make up the key data.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The key is neither a public key nor a key pair.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p data buffer is too small. You can determine a
+ *         sufficient buffer size by calling
+ *         #PSA_EXPORT_KEY_OUTPUT_SIZE(#PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(\c type), \c bits)
+ *         where \c type is the key type
+ *         and \c bits is the key size in bits.
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_export_public_key(psa_key_id_t key,
+                                   uint8_t *data,
+                                   size_t data_size,
+                                   size_t *data_length);
+
+
+
+/**@}*/
+
+/** \defgroup hash Message digests
+ * @{
+ */
+
+/** Calculate the hash (digest) of a message.
+ *
+ * \note To verify the hash of a message against an
+ *       expected value, use psa_hash_compare() instead.
+ *
+ * \param alg               The hash algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_HASH(\p alg) is true).
+ * \param[in] input         Buffer containing the message to hash.
+ * \param input_length      Size of the \p input buffer in bytes.
+ * \param[out] hash         Buffer where the hash is to be written.
+ * \param hash_size         Size of the \p hash buffer in bytes.
+ * \param[out] hash_length  On success, the number of bytes
+ *                          that make up the hash value. This is always
+ *                          #PSA_HASH_LENGTH(\p alg).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a hash algorithm.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         \p hash_size is too small
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_hash_compute(psa_algorithm_t alg,
+                              const uint8_t *input,
+                              size_t input_length,
+                              uint8_t *hash,
+                              size_t hash_size,
+                              size_t *hash_length);
+
+/** Calculate the hash (digest) of a message and compare it with a
+ * reference value.
+ *
+ * \param alg               The hash algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_HASH(\p alg) is true).
+ * \param[in] input         Buffer containing the message to hash.
+ * \param input_length      Size of the \p input buffer in bytes.
+ * \param[out] hash         Buffer containing the expected hash value.
+ * \param hash_length       Size of the \p hash buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         The expected hash is identical to the actual hash of the input.
+ * \retval #PSA_ERROR_INVALID_SIGNATURE
+ *         The hash of the message was calculated successfully, but it
+ *         differs from the expected hash.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a hash algorithm.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p input_length or \p hash_length do not match the hash size for \p alg
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_hash_compare(psa_algorithm_t alg,
+                              const uint8_t *input,
+                              size_t input_length,
+                              const uint8_t *hash,
+                              size_t hash_length);
+
+/** The type of the state data structure for multipart hash operations.
+ *
+ * Before calling any function on a hash operation object, the application must
+ * initialize it by any of the following means:
+ * - Set the structure to all-bits-zero, for example:
+ *   \code
+ *   psa_hash_operation_t operation;
+ *   memset(&operation, 0, sizeof(operation));
+ *   \endcode
+ * - Initialize the structure to logical zero values, for example:
+ *   \code
+ *   psa_hash_operation_t operation = {0};
+ *   \endcode
+ * - Initialize the structure to the initializer #PSA_HASH_OPERATION_INIT,
+ *   for example:
+ *   \code
+ *   psa_hash_operation_t operation = PSA_HASH_OPERATION_INIT;
+ *   \endcode
+ * - Assign the result of the function psa_hash_operation_init()
+ *   to the structure, for example:
+ *   \code
+ *   psa_hash_operation_t operation;
+ *   operation = psa_hash_operation_init();
+ *   \endcode
+ *
+ * This is an implementation-defined \c struct. Applications should not
+ * make any assumptions about the content of this structure except
+ * as directed by the documentation of a specific implementation. */
+typedef struct psa_hash_operation_s psa_hash_operation_t;
+
+/** \def PSA_HASH_OPERATION_INIT
+ *
+ * This macro returns a suitable initializer for a hash operation object
+ * of type #psa_hash_operation_t.
+ */
+#ifdef __DOXYGEN_ONLY__
+/* This is an example definition for documentation purposes.
+ * Implementations should define a suitable value in `crypto_struct.h`.
+ */
+#define PSA_HASH_OPERATION_INIT {0}
+#endif
+
+/** Return an initial value for a hash operation object.
+ */
+static psa_hash_operation_t psa_hash_operation_init(void);
+
+/** Set up a multipart hash operation.
+ *
+ * The sequence of operations to calculate a hash (message digest)
+ * is as follows:
+ * -# Allocate an operation object which will be passed to all the functions
+ *    listed here.
+ * -# Initialize the operation object with one of the methods described in the
+ *    documentation for #psa_hash_operation_t, e.g. #PSA_HASH_OPERATION_INIT.
+ * -# Call psa_hash_setup() to specify the algorithm.
+ * -# Call psa_hash_update() zero, one or more times, passing a fragment
+ *    of the message each time. The hash that is calculated is the hash
+ *    of the concatenation of these messages in order.
+ * -# To calculate the hash, call psa_hash_finish().
+ *    To compare the hash with an expected value, call psa_hash_verify().
+ *
+ * If an error occurs at any step after a call to psa_hash_setup(), the
+ * operation will need to be reset by a call to psa_hash_abort(). The
+ * application may call psa_hash_abort() at any time after the operation
+ * has been initialized.
+ *
+ * After a successful call to psa_hash_setup(), the application must
+ * eventually terminate the operation. The following events terminate an
+ * operation:
+ * - A successful call to psa_hash_finish() or psa_hash_verify().
+ * - A call to psa_hash_abort().
+ *
+ * \param[in,out] operation The operation object to set up. It must have
+ *                          been initialized as per the documentation for
+ *                          #psa_hash_operation_t and not yet in use.
+ * \param alg               The hash algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_HASH(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not a supported hash algorithm.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p alg is not a hash algorithm.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_hash_setup(psa_hash_operation_t *operation,
+                            psa_algorithm_t alg);
+
+/** Add a message fragment to a multipart hash operation.
+ *
+ * The application must call psa_hash_setup() before calling this function.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_hash_abort().
+ *
+ * \param[in,out] operation Active hash operation.
+ * \param[in] input         Buffer containing the message fragment to hash.
+ * \param input_length      Size of the \p input buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it muct be active).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_hash_update(psa_hash_operation_t *operation,
+                             const uint8_t *input,
+                             size_t input_length);
+
+/** Finish the calculation of the hash of a message.
+ *
+ * The application must call psa_hash_setup() before calling this function.
+ * This function calculates the hash of the message formed by concatenating
+ * the inputs passed to preceding calls to psa_hash_update().
+ *
+ * When this function returns successfuly, the operation becomes inactive.
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_hash_abort().
+ *
+ * \warning Applications should not call this function if they expect
+ *          a specific value for the hash. Call psa_hash_verify() instead.
+ *          Beware that comparing integrity or authenticity data such as
+ *          hash values with a function such as \c memcmp is risky
+ *          because the time taken by the comparison may leak information
+ *          about the hashed data which could allow an attacker to guess
+ *          a valid hash and thereby bypass security controls.
+ *
+ * \param[in,out] operation     Active hash operation.
+ * \param[out] hash             Buffer where the hash is to be written.
+ * \param hash_size             Size of the \p hash buffer in bytes.
+ * \param[out] hash_length      On success, the number of bytes
+ *                              that make up the hash value. This is always
+ *                              #PSA_HASH_LENGTH(\c alg) where \c alg is the
+ *                              hash algorithm that is calculated.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p hash buffer is too small. You can determine a
+ *         sufficient buffer size by calling #PSA_HASH_LENGTH(\c alg)
+ *         where \c alg is the hash algorithm that is calculated.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_hash_finish(psa_hash_operation_t *operation,
+                             uint8_t *hash,
+                             size_t hash_size,
+                             size_t *hash_length);
+
+/** Finish the calculation of the hash of a message and compare it with
+ * an expected value.
+ *
+ * The application must call psa_hash_setup() before calling this function.
+ * This function calculates the hash of the message formed by concatenating
+ * the inputs passed to preceding calls to psa_hash_update(). It then
+ * compares the calculated hash with the expected hash passed as a
+ * parameter to this function.
+ *
+ * When this function returns successfuly, the operation becomes inactive.
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_hash_abort().
+ *
+ * \note Implementations shall make the best effort to ensure that the
+ * comparison between the actual hash and the expected hash is performed
+ * in constant time.
+ *
+ * \param[in,out] operation     Active hash operation.
+ * \param[in] hash              Buffer containing the expected hash value.
+ * \param hash_length           Size of the \p hash buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         The expected hash is identical to the actual hash of the message.
+ * \retval #PSA_ERROR_INVALID_SIGNATURE
+ *         The hash of the message was calculated successfully, but it
+ *         differs from the expected hash.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_hash_verify(psa_hash_operation_t *operation,
+                             const uint8_t *hash,
+                             size_t hash_length);
+
+/** Abort a hash operation.
+ *
+ * Aborting an operation frees all associated resources except for the
+ * \p operation structure itself. Once aborted, the operation object
+ * can be reused for another operation by calling
+ * psa_hash_setup() again.
+ *
+ * You may call this function any time after the operation object has
+ * been initialized by one of the methods described in #psa_hash_operation_t.
+ *
+ * In particular, calling psa_hash_abort() after the operation has been
+ * terminated by a call to psa_hash_abort(), psa_hash_finish() or
+ * psa_hash_verify() is safe and has no effect.
+ *
+ * \param[in,out] operation     Initialized hash operation.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_hash_abort(psa_hash_operation_t *operation);
+
+/** Clone a hash operation.
+ *
+ * This function copies the state of an ongoing hash operation to
+ * a new operation object. In other words, this function is equivalent
+ * to calling psa_hash_setup() on \p target_operation with the same
+ * algorithm that \p source_operation was set up for, then
+ * psa_hash_update() on \p target_operation with the same input that
+ * that was passed to \p source_operation. After this function returns, the
+ * two objects are independent, i.e. subsequent calls involving one of
+ * the objects do not affect the other object.
+ *
+ * \param[in] source_operation      The active hash operation to clone.
+ * \param[in,out] target_operation  The operation object to set up.
+ *                                  It must be initialized but not active.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The \p source_operation state is not valid (it must be active).
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The \p target_operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_hash_clone(const psa_hash_operation_t *source_operation,
+                            psa_hash_operation_t *target_operation);
+
+/**@}*/
+
+/** \defgroup MAC Message authentication codes
+ * @{
+ */
+
+/** Calculate the MAC (message authentication code) of a message.
+ *
+ * \note To verify the MAC of a message against an
+ *       expected value, use psa_mac_verify() instead.
+ *       Beware that comparing integrity or authenticity data such as
+ *       MAC values with a function such as \c memcmp is risky
+ *       because the time taken by the comparison may leak information
+ *       about the MAC value which could allow an attacker to guess
+ *       a valid MAC and thereby bypass security controls.
+ *
+ * \param key               Identifier of the key to use for the operation. It
+ *                          must allow the usage PSA_KEY_USAGE_SIGN_MESSAGE.
+ * \param alg               The MAC algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_MAC(\p alg) is true).
+ * \param[in] input         Buffer containing the input message.
+ * \param input_length      Size of the \p input buffer in bytes.
+ * \param[out] mac          Buffer where the MAC value is to be written.
+ * \param mac_size          Size of the \p mac buffer in bytes.
+ * \param[out] mac_length   On success, the number of bytes
+ *                          that make up the MAC value.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a MAC algorithm.
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         \p mac_size is too small
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ *         The key could not be retrieved from storage.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_mac_compute(psa_key_id_t key,
+                             psa_algorithm_t alg,
+                             const uint8_t *input,
+                             size_t input_length,
+                             uint8_t *mac,
+                             size_t mac_size,
+                             size_t *mac_length);
+
+/** Calculate the MAC of a message and compare it with a reference value.
+ *
+ * \param key               Identifier of the key to use for the operation. It
+ *                          must allow the usage PSA_KEY_USAGE_VERIFY_MESSAGE.
+ * \param alg               The MAC algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_MAC(\p alg) is true).
+ * \param[in] input         Buffer containing the input message.
+ * \param input_length      Size of the \p input buffer in bytes.
+ * \param[out] mac          Buffer containing the expected MAC value.
+ * \param mac_length        Size of the \p mac buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         The expected MAC is identical to the actual MAC of the input.
+ * \retval #PSA_ERROR_INVALID_SIGNATURE
+ *         The MAC of the message was calculated successfully, but it
+ *         differs from the expected value.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a MAC algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ *         The key could not be retrieved from storage.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_mac_verify(psa_key_id_t key,
+                            psa_algorithm_t alg,
+                            const uint8_t *input,
+                            size_t input_length,
+                            const uint8_t *mac,
+                            size_t mac_length);
+
+/** The type of the state data structure for multipart MAC operations.
+ *
+ * Before calling any function on a MAC operation object, the application must
+ * initialize it by any of the following means:
+ * - Set the structure to all-bits-zero, for example:
+ *   \code
+ *   psa_mac_operation_t operation;
+ *   memset(&operation, 0, sizeof(operation));
+ *   \endcode
+ * - Initialize the structure to logical zero values, for example:
+ *   \code
+ *   psa_mac_operation_t operation = {0};
+ *   \endcode
+ * - Initialize the structure to the initializer #PSA_MAC_OPERATION_INIT,
+ *   for example:
+ *   \code
+ *   psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
+ *   \endcode
+ * - Assign the result of the function psa_mac_operation_init()
+ *   to the structure, for example:
+ *   \code
+ *   psa_mac_operation_t operation;
+ *   operation = psa_mac_operation_init();
+ *   \endcode
+ *
+ * This is an implementation-defined \c struct. Applications should not
+ * make any assumptions about the content of this structure except
+ * as directed by the documentation of a specific implementation. */
+typedef struct psa_mac_operation_s psa_mac_operation_t;
+
+/** \def PSA_MAC_OPERATION_INIT
+ *
+ * This macro returns a suitable initializer for a MAC operation object of type
+ * #psa_mac_operation_t.
+ */
+#ifdef __DOXYGEN_ONLY__
+/* This is an example definition for documentation purposes.
+ * Implementations should define a suitable value in `crypto_struct.h`.
+ */
+#define PSA_MAC_OPERATION_INIT {0}
+#endif
+
+/** Return an initial value for a MAC operation object.
+ */
+static psa_mac_operation_t psa_mac_operation_init(void);
+
+/** Set up a multipart MAC calculation operation.
+ *
+ * This function sets up the calculation of the MAC
+ * (message authentication code) of a byte string.
+ * To verify the MAC of a message against an
+ * expected value, use psa_mac_verify_setup() instead.
+ *
+ * The sequence of operations to calculate a MAC is as follows:
+ * -# Allocate an operation object which will be passed to all the functions
+ *    listed here.
+ * -# Initialize the operation object with one of the methods described in the
+ *    documentation for #psa_mac_operation_t, e.g. #PSA_MAC_OPERATION_INIT.
+ * -# Call psa_mac_sign_setup() to specify the algorithm and key.
+ * -# Call psa_mac_update() zero, one or more times, passing a fragment
+ *    of the message each time. The MAC that is calculated is the MAC
+ *    of the concatenation of these messages in order.
+ * -# At the end of the message, call psa_mac_sign_finish() to finish
+ *    calculating the MAC value and retrieve it.
+ *
+ * If an error occurs at any step after a call to psa_mac_sign_setup(), the
+ * operation will need to be reset by a call to psa_mac_abort(). The
+ * application may call psa_mac_abort() at any time after the operation
+ * has been initialized.
+ *
+ * After a successful call to psa_mac_sign_setup(), the application must
+ * eventually terminate the operation through one of the following methods:
+ * - A successful call to psa_mac_sign_finish().
+ * - A call to psa_mac_abort().
+ *
+ * \param[in,out] operation The operation object to set up. It must have
+ *                          been initialized as per the documentation for
+ *                          #psa_mac_operation_t and not yet in use.
+ * \param key               Identifier of the key to use for the operation. It
+ *                          must remain valid until the operation terminates.
+ *                          It must allow the usage PSA_KEY_USAGE_SIGN_MESSAGE.
+ * \param alg               The MAC algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_MAC(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a MAC algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ *         The key could not be retrieved from storage.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_mac_sign_setup(psa_mac_operation_t *operation,
+                                psa_key_id_t key,
+                                psa_algorithm_t alg);
+
+/** Set up a multipart MAC verification operation.
+ *
+ * This function sets up the verification of the MAC
+ * (message authentication code) of a byte string against an expected value.
+ *
+ * The sequence of operations to verify a MAC is as follows:
+ * -# Allocate an operation object which will be passed to all the functions
+ *    listed here.
+ * -# Initialize the operation object with one of the methods described in the
+ *    documentation for #psa_mac_operation_t, e.g. #PSA_MAC_OPERATION_INIT.
+ * -# Call psa_mac_verify_setup() to specify the algorithm and key.
+ * -# Call psa_mac_update() zero, one or more times, passing a fragment
+ *    of the message each time. The MAC that is calculated is the MAC
+ *    of the concatenation of these messages in order.
+ * -# At the end of the message, call psa_mac_verify_finish() to finish
+ *    calculating the actual MAC of the message and verify it against
+ *    the expected value.
+ *
+ * If an error occurs at any step after a call to psa_mac_verify_setup(), the
+ * operation will need to be reset by a call to psa_mac_abort(). The
+ * application may call psa_mac_abort() at any time after the operation
+ * has been initialized.
+ *
+ * After a successful call to psa_mac_verify_setup(), the application must
+ * eventually terminate the operation through one of the following methods:
+ * - A successful call to psa_mac_verify_finish().
+ * - A call to psa_mac_abort().
+ *
+ * \param[in,out] operation The operation object to set up. It must have
+ *                          been initialized as per the documentation for
+ *                          #psa_mac_operation_t and not yet in use.
+ * \param key               Identifier of the key to use for the operation. It
+ *                          must remain valid until the operation terminates.
+ *                          It must allow the usage
+ *                          PSA_KEY_USAGE_VERIFY_MESSAGE.
+ * \param alg               The MAC algorithm to compute (\c PSA_ALG_XXX value
+ *                          such that #PSA_ALG_IS_MAC(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \c key is not compatible with \c alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \c alg is not supported or is not a MAC algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ *         The key could not be retrieved from storage
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_mac_verify_setup(psa_mac_operation_t *operation,
+                                  psa_key_id_t key,
+                                  psa_algorithm_t alg);
+
+/** Add a message fragment to a multipart MAC operation.
+ *
+ * The application must call psa_mac_sign_setup() or psa_mac_verify_setup()
+ * before calling this function.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_mac_abort().
+ *
+ * \param[in,out] operation Active MAC operation.
+ * \param[in] input         Buffer containing the message fragment to add to
+ *                          the MAC calculation.
+ * \param input_length      Size of the \p input buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_mac_update(psa_mac_operation_t *operation,
+                            const uint8_t *input,
+                            size_t input_length);
+
+/** Finish the calculation of the MAC of a message.
+ *
+ * The application must call psa_mac_sign_setup() before calling this function.
+ * This function calculates the MAC of the message formed by concatenating
+ * the inputs passed to preceding calls to psa_mac_update().
+ *
+ * When this function returns successfuly, the operation becomes inactive.
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_mac_abort().
+ *
+ * \warning Applications should not call this function if they expect
+ *          a specific value for the MAC. Call psa_mac_verify_finish() instead.
+ *          Beware that comparing integrity or authenticity data such as
+ *          MAC values with a function such as \c memcmp is risky
+ *          because the time taken by the comparison may leak information
+ *          about the MAC value which could allow an attacker to guess
+ *          a valid MAC and thereby bypass security controls.
+ *
+ * \param[in,out] operation Active MAC operation.
+ * \param[out] mac          Buffer where the MAC value is to be written.
+ * \param mac_size          Size of the \p mac buffer in bytes.
+ * \param[out] mac_length   On success, the number of bytes
+ *                          that make up the MAC value. This is always
+ *                          #PSA_MAC_LENGTH(\c key_type, \c key_bits, \c alg)
+ *                          where \c key_type and \c key_bits are the type and
+ *                          bit-size respectively of the key and \c alg is the
+ *                          MAC algorithm that is calculated.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be an active mac sign
+ *         operation).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p mac buffer is too small. You can determine a
+ *         sufficient buffer size by calling PSA_MAC_LENGTH().
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_mac_sign_finish(psa_mac_operation_t *operation,
+                                 uint8_t *mac,
+                                 size_t mac_size,
+                                 size_t *mac_length);
+
+/** Finish the calculation of the MAC of a message and compare it with
+ * an expected value.
+ *
+ * The application must call psa_mac_verify_setup() before calling this function.
+ * This function calculates the MAC of the message formed by concatenating
+ * the inputs passed to preceding calls to psa_mac_update(). It then
+ * compares the calculated MAC with the expected MAC passed as a
+ * parameter to this function.
+ *
+ * When this function returns successfuly, the operation becomes inactive.
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_mac_abort().
+ *
+ * \note Implementations shall make the best effort to ensure that the
+ * comparison between the actual MAC and the expected MAC is performed
+ * in constant time.
+ *
+ * \param[in,out] operation Active MAC operation.
+ * \param[in] mac           Buffer containing the expected MAC value.
+ * \param mac_length        Size of the \p mac buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         The expected MAC is identical to the actual MAC of the message.
+ * \retval #PSA_ERROR_INVALID_SIGNATURE
+ *         The MAC of the message was calculated successfully, but it
+ *         differs from the expected MAC.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be an active mac verify
+ *         operation).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_mac_verify_finish(psa_mac_operation_t *operation,
+                                   const uint8_t *mac,
+                                   size_t mac_length);
+
+/** Abort a MAC operation.
+ *
+ * Aborting an operation frees all associated resources except for the
+ * \p operation structure itself. Once aborted, the operation object
+ * can be reused for another operation by calling
+ * psa_mac_sign_setup() or psa_mac_verify_setup() again.
+ *
+ * You may call this function any time after the operation object has
+ * been initialized by one of the methods described in #psa_mac_operation_t.
+ *
+ * In particular, calling psa_mac_abort() after the operation has been
+ * terminated by a call to psa_mac_abort(), psa_mac_sign_finish() or
+ * psa_mac_verify_finish() is safe and has no effect.
+ *
+ * \param[in,out] operation Initialized MAC operation.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_mac_abort(psa_mac_operation_t *operation);
+
+/**@}*/
+
+/** \defgroup cipher Symmetric ciphers
+ * @{
+ */
+
+/** Encrypt a message using a symmetric cipher.
+ *
+ * This function encrypts a message with a random IV (initialization
+ * vector). Use the multipart operation interface with a
+ * #psa_cipher_operation_t object to provide other forms of IV.
+ *
+ * \param key                   Identifier of the key to use for the operation.
+ *                              It must allow the usage #PSA_KEY_USAGE_ENCRYPT.
+ * \param alg                   The cipher algorithm to compute
+ *                              (\c PSA_ALG_XXX value such that
+ *                              #PSA_ALG_IS_CIPHER(\p alg) is true).
+ * \param[in] input             Buffer containing the message to encrypt.
+ * \param input_length          Size of the \p input buffer in bytes.
+ * \param[out] output           Buffer where the output is to be written.
+ *                              The output contains the IV followed by
+ *                              the ciphertext proper.
+ * \param output_size           Size of the \p output buffer in bytes.
+ * \param[out] output_length    On success, the number of bytes
+ *                              that make up the output.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a cipher algorithm.
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_encrypt(psa_key_id_t key,
+                                psa_algorithm_t alg,
+                                const uint8_t *input,
+                                size_t input_length,
+                                uint8_t *output,
+                                size_t output_size,
+                                size_t *output_length);
+
+/** Decrypt a message using a symmetric cipher.
+ *
+ * This function decrypts a message encrypted with a symmetric cipher.
+ *
+ * \param key                   Identifier of the key to use for the operation.
+ *                              It must remain valid until the operation
+ *                              terminates. It must allow the usage
+ *                              #PSA_KEY_USAGE_DECRYPT.
+ * \param alg                   The cipher algorithm to compute
+ *                              (\c PSA_ALG_XXX value such that
+ *                              #PSA_ALG_IS_CIPHER(\p alg) is true).
+ * \param[in] input             Buffer containing the message to decrypt.
+ *                              This consists of the IV followed by the
+ *                              ciphertext proper.
+ * \param input_length          Size of the \p input buffer in bytes.
+ * \param[out] output           Buffer where the plaintext is to be written.
+ * \param output_size           Size of the \p output buffer in bytes.
+ * \param[out] output_length    On success, the number of bytes
+ *                              that make up the output.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a cipher algorithm.
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_decrypt(psa_key_id_t key,
+                                psa_algorithm_t alg,
+                                const uint8_t *input,
+                                size_t input_length,
+                                uint8_t *output,
+                                size_t output_size,
+                                size_t *output_length);
+
+/** The type of the state data structure for multipart cipher operations.
+ *
+ * Before calling any function on a cipher operation object, the application
+ * must initialize it by any of the following means:
+ * - Set the structure to all-bits-zero, for example:
+ *   \code
+ *   psa_cipher_operation_t operation;
+ *   memset(&operation, 0, sizeof(operation));
+ *   \endcode
+ * - Initialize the structure to logical zero values, for example:
+ *   \code
+ *   psa_cipher_operation_t operation = {0};
+ *   \endcode
+ * - Initialize the structure to the initializer #PSA_CIPHER_OPERATION_INIT,
+ *   for example:
+ *   \code
+ *   psa_cipher_operation_t operation = PSA_CIPHER_OPERATION_INIT;
+ *   \endcode
+ * - Assign the result of the function psa_cipher_operation_init()
+ *   to the structure, for example:
+ *   \code
+ *   psa_cipher_operation_t operation;
+ *   operation = psa_cipher_operation_init();
+ *   \endcode
+ *
+ * This is an implementation-defined \c struct. Applications should not
+ * make any assumptions about the content of this structure except
+ * as directed by the documentation of a specific implementation. */
+typedef struct psa_cipher_operation_s psa_cipher_operation_t;
+
+/** \def PSA_CIPHER_OPERATION_INIT
+ *
+ * This macro returns a suitable initializer for a cipher operation object of
+ * type #psa_cipher_operation_t.
+ */
+#ifdef __DOXYGEN_ONLY__
+/* This is an example definition for documentation purposes.
+ * Implementations should define a suitable value in `crypto_struct.h`.
+ */
+#define PSA_CIPHER_OPERATION_INIT {0}
+#endif
+
+/** Return an initial value for a cipher operation object.
+ */
+static psa_cipher_operation_t psa_cipher_operation_init(void);
+
+/** Set the key for a multipart symmetric encryption operation.
+ *
+ * The sequence of operations to encrypt a message with a symmetric cipher
+ * is as follows:
+ * -# Allocate an operation object which will be passed to all the functions
+ *    listed here.
+ * -# Initialize the operation object with one of the methods described in the
+ *    documentation for #psa_cipher_operation_t, e.g.
+ *    #PSA_CIPHER_OPERATION_INIT.
+ * -# Call psa_cipher_encrypt_setup() to specify the algorithm and key.
+ * -# Call either psa_cipher_generate_iv() or psa_cipher_set_iv() to
+ *    generate or set the IV (initialization vector). You should use
+ *    psa_cipher_generate_iv() unless the protocol you are implementing
+ *    requires a specific IV value.
+ * -# Call psa_cipher_update() zero, one or more times, passing a fragment
+ *    of the message each time.
+ * -# Call psa_cipher_finish().
+ *
+ * If an error occurs at any step after a call to psa_cipher_encrypt_setup(),
+ * the operation will need to be reset by a call to psa_cipher_abort(). The
+ * application may call psa_cipher_abort() at any time after the operation
+ * has been initialized.
+ *
+ * After a successful call to psa_cipher_encrypt_setup(), the application must
+ * eventually terminate the operation. The following events terminate an
+ * operation:
+ * - A successful call to psa_cipher_finish().
+ * - A call to psa_cipher_abort().
+ *
+ * \param[in,out] operation     The operation object to set up. It must have
+ *                              been initialized as per the documentation for
+ *                              #psa_cipher_operation_t and not yet in use.
+ * \param key                   Identifier of the key to use for the operation.
+ *                              It must remain valid until the operation
+ *                              terminates. It must allow the usage
+ *                              #PSA_KEY_USAGE_ENCRYPT.
+ * \param alg                   The cipher algorithm to compute
+ *                              (\c PSA_ALG_XXX value such that
+ *                              #PSA_ALG_IS_CIPHER(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a cipher algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_encrypt_setup(psa_cipher_operation_t *operation,
+                                      psa_key_id_t key,
+                                      psa_algorithm_t alg);
+
+/** Set the key for a multipart symmetric decryption operation.
+ *
+ * The sequence of operations to decrypt a message with a symmetric cipher
+ * is as follows:
+ * -# Allocate an operation object which will be passed to all the functions
+ *    listed here.
+ * -# Initialize the operation object with one of the methods described in the
+ *    documentation for #psa_cipher_operation_t, e.g.
+ *    #PSA_CIPHER_OPERATION_INIT.
+ * -# Call psa_cipher_decrypt_setup() to specify the algorithm and key.
+ * -# Call psa_cipher_set_iv() with the IV (initialization vector) for the
+ *    decryption. If the IV is prepended to the ciphertext, you can call
+ *    psa_cipher_update() on a buffer containing the IV followed by the
+ *    beginning of the message.
+ * -# Call psa_cipher_update() zero, one or more times, passing a fragment
+ *    of the message each time.
+ * -# Call psa_cipher_finish().
+ *
+ * If an error occurs at any step after a call to psa_cipher_decrypt_setup(),
+ * the operation will need to be reset by a call to psa_cipher_abort(). The
+ * application may call psa_cipher_abort() at any time after the operation
+ * has been initialized.
+ *
+ * After a successful call to psa_cipher_decrypt_setup(), the application must
+ * eventually terminate the operation. The following events terminate an
+ * operation:
+ * - A successful call to psa_cipher_finish().
+ * - A call to psa_cipher_abort().
+ *
+ * \param[in,out] operation     The operation object to set up. It must have
+ *                              been initialized as per the documentation for
+ *                              #psa_cipher_operation_t and not yet in use.
+ * \param key                   Identifier of the key to use for the operation.
+ *                              It must remain valid until the operation
+ *                              terminates. It must allow the usage
+ *                              #PSA_KEY_USAGE_DECRYPT.
+ * \param alg                   The cipher algorithm to compute
+ *                              (\c PSA_ALG_XXX value such that
+ *                              #PSA_ALG_IS_CIPHER(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not a cipher algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_decrypt_setup(psa_cipher_operation_t *operation,
+                                      psa_key_id_t key,
+                                      psa_algorithm_t alg);
+
+/** Generate an IV for a symmetric encryption operation.
+ *
+ * This function generates a random IV (initialization vector), nonce
+ * or initial counter value for the encryption operation as appropriate
+ * for the chosen algorithm, key type and key size.
+ *
+ * The application must call psa_cipher_encrypt_setup() before
+ * calling this function.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_cipher_abort().
+ *
+ * \param[in,out] operation     Active cipher operation.
+ * \param[out] iv               Buffer where the generated IV is to be written.
+ * \param iv_size               Size of the \p iv buffer in bytes.
+ * \param[out] iv_length        On success, the number of bytes of the
+ *                              generated IV.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active, with no IV set).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p iv buffer is too small.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_generate_iv(psa_cipher_operation_t *operation,
+                                    uint8_t *iv,
+                                    size_t iv_size,
+                                    size_t *iv_length);
+
+/** Set the IV for a symmetric encryption or decryption operation.
+ *
+ * This function sets the IV (initialization vector), nonce
+ * or initial counter value for the encryption or decryption operation.
+ *
+ * The application must call psa_cipher_encrypt_setup() before
+ * calling this function.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_cipher_abort().
+ *
+ * \note When encrypting, applications should use psa_cipher_generate_iv()
+ * instead of this function, unless implementing a protocol that requires
+ * a non-random IV.
+ *
+ * \param[in,out] operation     Active cipher operation.
+ * \param[in] iv                Buffer containing the IV to use.
+ * \param iv_length             Size of the IV in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be an active cipher
+ *         encrypt operation, with no IV set).
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The size of \p iv is not acceptable for the chosen algorithm,
+ *         or the chosen algorithm does not use an IV.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_set_iv(psa_cipher_operation_t *operation,
+                               const uint8_t *iv,
+                               size_t iv_length);
+
+/** Encrypt or decrypt a message fragment in an active cipher operation.
+ *
+ * Before calling this function, you must:
+ * 1. Call either psa_cipher_encrypt_setup() or psa_cipher_decrypt_setup().
+ *    The choice of setup function determines whether this function
+ *    encrypts or decrypts its input.
+ * 2. If the algorithm requires an IV, call psa_cipher_generate_iv()
+ *    (recommended when encrypting) or psa_cipher_set_iv().
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_cipher_abort().
+ *
+ * \param[in,out] operation     Active cipher operation.
+ * \param[in] input             Buffer containing the message fragment to
+ *                              encrypt or decrypt.
+ * \param input_length          Size of the \p input buffer in bytes.
+ * \param[out] output           Buffer where the output is to be written.
+ * \param output_size           Size of the \p output buffer in bytes.
+ * \param[out] output_length    On success, the number of bytes
+ *                              that make up the returned output.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active, with an IV set
+ *         if required for the algorithm).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p output buffer is too small.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_update(psa_cipher_operation_t *operation,
+                               const uint8_t *input,
+                               size_t input_length,
+                               uint8_t *output,
+                               size_t output_size,
+                               size_t *output_length);
+
+/** Finish encrypting or decrypting a message in a cipher operation.
+ *
+ * The application must call psa_cipher_encrypt_setup() or
+ * psa_cipher_decrypt_setup() before calling this function. The choice
+ * of setup function determines whether this function encrypts or
+ * decrypts its input.
+ *
+ * This function finishes the encryption or decryption of the message
+ * formed by concatenating the inputs passed to preceding calls to
+ * psa_cipher_update().
+ *
+ * When this function returns successfuly, the operation becomes inactive.
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_cipher_abort().
+ *
+ * \param[in,out] operation     Active cipher operation.
+ * \param[out] output           Buffer where the output is to be written.
+ * \param output_size           Size of the \p output buffer in bytes.
+ * \param[out] output_length    On success, the number of bytes
+ *                              that make up the returned output.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The total input size passed to this operation is not valid for
+ *         this particular algorithm. For example, the algorithm is a based
+ *         on block cipher and requires a whole number of blocks, but the
+ *         total input size is not a multiple of the block size.
+ * \retval #PSA_ERROR_INVALID_PADDING
+ *         This is a decryption operation for an algorithm that includes
+ *         padding, and the ciphertext does not contain valid padding.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active, with an IV set
+ *         if required for the algorithm).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p output buffer is too small.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_finish(psa_cipher_operation_t *operation,
+                               uint8_t *output,
+                               size_t output_size,
+                               size_t *output_length);
+
+/** Abort a cipher operation.
+ *
+ * Aborting an operation frees all associated resources except for the
+ * \p operation structure itself. Once aborted, the operation object
+ * can be reused for another operation by calling
+ * psa_cipher_encrypt_setup() or psa_cipher_decrypt_setup() again.
+ *
+ * You may call this function any time after the operation object has
+ * been initialized as described in #psa_cipher_operation_t.
+ *
+ * In particular, calling psa_cipher_abort() after the operation has been
+ * terminated by a call to psa_cipher_abort() or psa_cipher_finish()
+ * is safe and has no effect.
+ *
+ * \param[in,out] operation     Initialized cipher operation.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_cipher_abort(psa_cipher_operation_t *operation);
+
+/**@}*/
+
+/** \defgroup aead Authenticated encryption with associated data (AEAD)
+ * @{
+ */
+
+/** Process an authenticated encryption operation.
+ *
+ * \param key                     Identifier of the key to use for the
+ *                                operation. It must allow the usage
+ *                                #PSA_KEY_USAGE_ENCRYPT.
+ * \param alg                     The AEAD algorithm to compute
+ *                                (\c PSA_ALG_XXX value such that
+ *                                #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param[in] nonce               Nonce or IV to use.
+ * \param nonce_length            Size of the \p nonce buffer in bytes.
+ * \param[in] additional_data     Additional data that will be authenticated
+ *                                but not encrypted.
+ * \param additional_data_length  Size of \p additional_data in bytes.
+ * \param[in] plaintext           Data that will be authenticated and
+ *                                encrypted.
+ * \param plaintext_length        Size of \p plaintext in bytes.
+ * \param[out] ciphertext         Output buffer for the authenticated and
+ *                                encrypted data. The additional data is not
+ *                                part of this output. For algorithms where the
+ *                                encrypted data and the authentication tag
+ *                                are defined as separate outputs, the
+ *                                authentication tag is appended to the
+ *                                encrypted data.
+ * \param ciphertext_size         Size of the \p ciphertext buffer in bytes.
+ *                                This must be at least
+ *                                #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(\p alg,
+ *                                \p plaintext_length).
+ * \param[out] ciphertext_length  On success, the size of the output
+ *                                in the \p ciphertext buffer.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not an AEAD algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         \p ciphertext_size is too small
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_encrypt(psa_key_id_t key,
+                              psa_algorithm_t alg,
+                              const uint8_t *nonce,
+                              size_t nonce_length,
+                              const uint8_t *additional_data,
+                              size_t additional_data_length,
+                              const uint8_t *plaintext,
+                              size_t plaintext_length,
+                              uint8_t *ciphertext,
+                              size_t ciphertext_size,
+                              size_t *ciphertext_length);
+
+/** Process an authenticated decryption operation.
+ *
+ * \param key                     Identifier of the key to use for the
+ *                                operation. It must allow the usage
+ *                                #PSA_KEY_USAGE_DECRYPT.
+ * \param alg                     The AEAD algorithm to compute
+ *                                (\c PSA_ALG_XXX value such that
+ *                                #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param[in] nonce               Nonce or IV to use.
+ * \param nonce_length            Size of the \p nonce buffer in bytes.
+ * \param[in] additional_data     Additional data that has been authenticated
+ *                                but not encrypted.
+ * \param additional_data_length  Size of \p additional_data in bytes.
+ * \param[in] ciphertext          Data that has been authenticated and
+ *                                encrypted. For algorithms where the
+ *                                encrypted data and the authentication tag
+ *                                are defined as separate inputs, the buffer
+ *                                must contain the encrypted data followed
+ *                                by the authentication tag.
+ * \param ciphertext_length       Size of \p ciphertext in bytes.
+ * \param[out] plaintext          Output buffer for the decrypted data.
+ * \param plaintext_size          Size of the \p plaintext buffer in bytes.
+ *                                This must be at least
+ *                                #PSA_AEAD_DECRYPT_OUTPUT_SIZE(\p alg,
+ *                                \p ciphertext_length).
+ * \param[out] plaintext_length   On success, the size of the output
+ *                                in the \p plaintext buffer.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_INVALID_SIGNATURE
+ *         The ciphertext is not authentic.
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not an AEAD algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         \p plaintext_size or \p nonce_length is too small
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_decrypt(psa_key_id_t key,
+                              psa_algorithm_t alg,
+                              const uint8_t *nonce,
+                              size_t nonce_length,
+                              const uint8_t *additional_data,
+                              size_t additional_data_length,
+                              const uint8_t *ciphertext,
+                              size_t ciphertext_length,
+                              uint8_t *plaintext,
+                              size_t plaintext_size,
+                              size_t *plaintext_length);
+
+/** The type of the state data structure for multipart AEAD operations.
+ *
+ * Before calling any function on an AEAD operation object, the application
+ * must initialize it by any of the following means:
+ * - Set the structure to all-bits-zero, for example:
+ *   \code
+ *   psa_aead_operation_t operation;
+ *   memset(&operation, 0, sizeof(operation));
+ *   \endcode
+ * - Initialize the structure to logical zero values, for example:
+ *   \code
+ *   psa_aead_operation_t operation = {0};
+ *   \endcode
+ * - Initialize the structure to the initializer #PSA_AEAD_OPERATION_INIT,
+ *   for example:
+ *   \code
+ *   psa_aead_operation_t operation = PSA_AEAD_OPERATION_INIT;
+ *   \endcode
+ * - Assign the result of the function psa_aead_operation_init()
+ *   to the structure, for example:
+ *   \code
+ *   psa_aead_operation_t operation;
+ *   operation = psa_aead_operation_init();
+ *   \endcode
+ *
+ * This is an implementation-defined \c struct. Applications should not
+ * make any assumptions about the content of this structure except
+ * as directed by the documentation of a specific implementation. */
+typedef struct psa_aead_operation_s psa_aead_operation_t;
+
+/** \def PSA_AEAD_OPERATION_INIT
+ *
+ * This macro returns a suitable initializer for an AEAD operation object of
+ * type #psa_aead_operation_t.
+ */
+#ifdef __DOXYGEN_ONLY__
+/* This is an example definition for documentation purposes.
+ * Implementations should define a suitable value in `crypto_struct.h`.
+ */
+#define PSA_AEAD_OPERATION_INIT {0}
+#endif
+
+/** Return an initial value for an AEAD operation object.
+ */
+static psa_aead_operation_t psa_aead_operation_init(void);
+
+/** Set the key for a multipart authenticated encryption operation.
+ *
+ * The sequence of operations to encrypt a message with authentication
+ * is as follows:
+ * -# Allocate an operation object which will be passed to all the functions
+ *    listed here.
+ * -# Initialize the operation object with one of the methods described in the
+ *    documentation for #psa_aead_operation_t, e.g.
+ *    #PSA_AEAD_OPERATION_INIT.
+ * -# Call psa_aead_encrypt_setup() to specify the algorithm and key.
+ * -# If needed, call psa_aead_set_lengths() to specify the length of the
+ *    inputs to the subsequent calls to psa_aead_update_ad() and
+ *    psa_aead_update(). See the documentation of psa_aead_set_lengths()
+ *    for details.
+ * -# Call either psa_aead_generate_nonce() or psa_aead_set_nonce() to
+ *    generate or set the nonce. You should use
+ *    psa_aead_generate_nonce() unless the protocol you are implementing
+ *    requires a specific nonce value.
+ * -# Call psa_aead_update_ad() zero, one or more times, passing a fragment
+ *    of the non-encrypted additional authenticated data each time.
+ * -# Call psa_aead_update() zero, one or more times, passing a fragment
+ *    of the message to encrypt each time.
+ * -# Call psa_aead_finish().
+ *
+ * If an error occurs at any step after a call to psa_aead_encrypt_setup(),
+ * the operation will need to be reset by a call to psa_aead_abort(). The
+ * application may call psa_aead_abort() at any time after the operation
+ * has been initialized.
+ *
+ * After a successful call to psa_aead_encrypt_setup(), the application must
+ * eventually terminate the operation. The following events terminate an
+ * operation:
+ * - A successful call to psa_aead_finish().
+ * - A call to psa_aead_abort().
+ *
+ * \param[in,out] operation     The operation object to set up. It must have
+ *                              been initialized as per the documentation for
+ *                              #psa_aead_operation_t and not yet in use.
+ * \param key                   Identifier of the key to use for the operation.
+ *                              It must remain valid until the operation
+ *                              terminates. It must allow the usage
+ *                              #PSA_KEY_USAGE_ENCRYPT.
+ * \param alg                   The AEAD algorithm to compute
+ *                              (\c PSA_ALG_XXX value such that
+ *                              #PSA_ALG_IS_AEAD(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not an AEAD algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_encrypt_setup(psa_aead_operation_t *operation,
+                                    psa_key_id_t key,
+                                    psa_algorithm_t alg);
+
+/** Set the key for a multipart authenticated decryption operation.
+ *
+ * The sequence of operations to decrypt a message with authentication
+ * is as follows:
+ * -# Allocate an operation object which will be passed to all the functions
+ *    listed here.
+ * -# Initialize the operation object with one of the methods described in the
+ *    documentation for #psa_aead_operation_t, e.g.
+ *    #PSA_AEAD_OPERATION_INIT.
+ * -# Call psa_aead_decrypt_setup() to specify the algorithm and key.
+ * -# If needed, call psa_aead_set_lengths() to specify the length of the
+ *    inputs to the subsequent calls to psa_aead_update_ad() and
+ *    psa_aead_update(). See the documentation of psa_aead_set_lengths()
+ *    for details.
+ * -# Call psa_aead_set_nonce() with the nonce for the decryption.
+ * -# Call psa_aead_update_ad() zero, one or more times, passing a fragment
+ *    of the non-encrypted additional authenticated data each time.
+ * -# Call psa_aead_update() zero, one or more times, passing a fragment
+ *    of the ciphertext to decrypt each time.
+ * -# Call psa_aead_verify().
+ *
+ * If an error occurs at any step after a call to psa_aead_decrypt_setup(),
+ * the operation will need to be reset by a call to psa_aead_abort(). The
+ * application may call psa_aead_abort() at any time after the operation
+ * has been initialized.
+ *
+ * After a successful call to psa_aead_decrypt_setup(), the application must
+ * eventually terminate the operation. The following events terminate an
+ * operation:
+ * - A successful call to psa_aead_verify().
+ * - A call to psa_aead_abort().
+ *
+ * \param[in,out] operation     The operation object to set up. It must have
+ *                              been initialized as per the documentation for
+ *                              #psa_aead_operation_t and not yet in use.
+ * \param key                   Identifier of the key to use for the operation.
+ *                              It must remain valid until the operation
+ *                              terminates. It must allow the usage
+ *                              #PSA_KEY_USAGE_DECRYPT.
+ * \param alg                   The AEAD algorithm to compute
+ *                              (\c PSA_ALG_XXX value such that
+ *                              #PSA_ALG_IS_AEAD(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p key is not compatible with \p alg.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not supported or is not an AEAD algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_decrypt_setup(psa_aead_operation_t *operation,
+                                    psa_key_id_t key,
+                                    psa_algorithm_t alg);
+
+/** Generate a random nonce for an authenticated encryption operation.
+ *
+ * This function generates a random nonce for the authenticated encryption
+ * operation with an appropriate size for the chosen algorithm, key type
+ * and key size.
+ *
+ * The application must call psa_aead_encrypt_setup() before
+ * calling this function.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_aead_abort().
+ *
+ * \param[in,out] operation     Active AEAD operation.
+ * \param[out] nonce            Buffer where the generated nonce is to be
+ *                              written.
+ * \param nonce_size            Size of the \p nonce buffer in bytes.
+ * \param[out] nonce_length     On success, the number of bytes of the
+ *                              generated nonce.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be an active aead encrypt
+ *         operation, with no nonce set).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p nonce buffer is too small.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_generate_nonce(psa_aead_operation_t *operation,
+                                     uint8_t *nonce,
+                                     size_t nonce_size,
+                                     size_t *nonce_length);
+
+/** Set the nonce for an authenticated encryption or decryption operation.
+ *
+ * This function sets the nonce for the authenticated
+ * encryption or decryption operation.
+ *
+ * The application must call psa_aead_encrypt_setup() or
+ * psa_aead_decrypt_setup() before calling this function.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_aead_abort().
+ *
+ * \note When encrypting, applications should use psa_aead_generate_nonce()
+ * instead of this function, unless implementing a protocol that requires
+ * a non-random IV.
+ *
+ * \param[in,out] operation     Active AEAD operation.
+ * \param[in] nonce             Buffer containing the nonce to use.
+ * \param nonce_length          Size of the nonce in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active, with no nonce
+ *         set).
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The size of \p nonce is not acceptable for the chosen algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_set_nonce(psa_aead_operation_t *operation,
+                                const uint8_t *nonce,
+                                size_t nonce_length);
+
+/** Declare the lengths of the message and additional data for AEAD.
+ *
+ * The application must call this function before calling
+ * psa_aead_update_ad() or psa_aead_update() if the algorithm for
+ * the operation requires it. If the algorithm does not require it,
+ * calling this function is optional, but if this function is called
+ * then the implementation must enforce the lengths.
+ *
+ * You may call this function before or after setting the nonce with
+ * psa_aead_set_nonce() or psa_aead_generate_nonce().
+ *
+ * - For #PSA_ALG_CCM, calling this function is required.
+ * - For the other AEAD algorithms defined in this specification, calling
+ *   this function is not required.
+ * - For vendor-defined algorithm, refer to the vendor documentation.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_aead_abort().
+ *
+ * \param[in,out] operation     Active AEAD operation.
+ * \param ad_length             Size of the non-encrypted additional
+ *                              authenticated data in bytes.
+ * \param plaintext_length      Size of the plaintext to encrypt in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active, and
+ *         psa_aead_update_ad() and psa_aead_update() must not have been
+ *         called yet).
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         At least one of the lengths is not acceptable for the chosen
+ *         algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_set_lengths(psa_aead_operation_t *operation,
+                                  size_t ad_length,
+                                  size_t plaintext_length);
+
+/** Pass additional data to an active AEAD operation.
+ *
+ * Additional data is authenticated, but not encrypted.
+ *
+ * You may call this function multiple times to pass successive fragments
+ * of the additional data. You may not call this function after passing
+ * data to encrypt or decrypt with psa_aead_update().
+ *
+ * Before calling this function, you must:
+ * 1. Call either psa_aead_encrypt_setup() or psa_aead_decrypt_setup().
+ * 2. Set the nonce with psa_aead_generate_nonce() or psa_aead_set_nonce().
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_aead_abort().
+ *
+ * \warning When decrypting, until psa_aead_verify() has returned #PSA_SUCCESS,
+ *          there is no guarantee that the input is valid. Therefore, until
+ *          you have called psa_aead_verify() and it has returned #PSA_SUCCESS,
+ *          treat the input as untrusted and prepare to undo any action that
+ *          depends on the input if psa_aead_verify() returns an error status.
+ *
+ * \param[in,out] operation     Active AEAD operation.
+ * \param[in] input             Buffer containing the fragment of
+ *                              additional data.
+ * \param input_length          Size of the \p input buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active, have a nonce
+ *         set, have lengths set if required by the algorithm, and
+ *         psa_aead_update() must not have been called yet).
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The total input length overflows the additional data length that
+ *         was previously specified with psa_aead_set_lengths().
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_update_ad(psa_aead_operation_t *operation,
+                                const uint8_t *input,
+                                size_t input_length);
+
+/** Encrypt or decrypt a message fragment in an active AEAD operation.
+ *
+ * Before calling this function, you must:
+ * 1. Call either psa_aead_encrypt_setup() or psa_aead_decrypt_setup().
+ *    The choice of setup function determines whether this function
+ *    encrypts or decrypts its input.
+ * 2. Set the nonce with psa_aead_generate_nonce() or psa_aead_set_nonce().
+ * 3. Call psa_aead_update_ad() to pass all the additional data.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_aead_abort().
+ *
+ * \warning When decrypting, until psa_aead_verify() has returned #PSA_SUCCESS,
+ *          there is no guarantee that the input is valid. Therefore, until
+ *          you have called psa_aead_verify() and it has returned #PSA_SUCCESS:
+ *          - Do not use the output in any way other than storing it in a
+ *            confidential location. If you take any action that depends
+ *            on the tentative decrypted data, this action will need to be
+ *            undone if the input turns out not to be valid. Furthermore,
+ *            if an adversary can observe that this action took place
+ *            (for example through timing), they may be able to use this
+ *            fact as an oracle to decrypt any message encrypted with the
+ *            same key.
+ *          - In particular, do not copy the output anywhere but to a
+ *            memory or storage space that you have exclusive access to.
+ *
+ * This function does not require the input to be aligned to any
+ * particular block boundary. If the implementation can only process
+ * a whole block at a time, it must consume all the input provided, but
+ * it may delay the end of the corresponding output until a subsequent
+ * call to psa_aead_update(), psa_aead_finish() or psa_aead_verify()
+ * provides sufficient input. The amount of data that can be delayed
+ * in this way is bounded by #PSA_AEAD_UPDATE_OUTPUT_SIZE.
+ *
+ * \param[in,out] operation     Active AEAD operation.
+ * \param[in] input             Buffer containing the message fragment to
+ *                              encrypt or decrypt.
+ * \param input_length          Size of the \p input buffer in bytes.
+ * \param[out] output           Buffer where the output is to be written.
+ * \param output_size           Size of the \p output buffer in bytes.
+ *                              This must be at least
+ *                              #PSA_AEAD_UPDATE_OUTPUT_SIZE(\c alg,
+ *                              \p input_length) where \c alg is the
+ *                              algorithm that is being calculated.
+ * \param[out] output_length    On success, the number of bytes
+ *                              that make up the returned output.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active, have a nonce
+ *         set, and have lengths set if required by the algorithm).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p output buffer is too small.
+ *         You can determine a sufficient buffer size by calling
+ *         #PSA_AEAD_UPDATE_OUTPUT_SIZE(\c alg, \p input_length)
+ *         where \c alg is the algorithm that is being calculated.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The total length of input to psa_aead_update_ad() so far is
+ *         less than the additional data length that was previously
+ *         specified with psa_aead_set_lengths().
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The total input length overflows the plaintext length that
+ *         was previously specified with psa_aead_set_lengths().
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_update(psa_aead_operation_t *operation,
+                             const uint8_t *input,
+                             size_t input_length,
+                             uint8_t *output,
+                             size_t output_size,
+                             size_t *output_length);
+
+/** Finish encrypting a message in an AEAD operation.
+ *
+ * The operation must have been set up with psa_aead_encrypt_setup().
+ *
+ * This function finishes the authentication of the additional data
+ * formed by concatenating the inputs passed to preceding calls to
+ * psa_aead_update_ad() with the plaintext formed by concatenating the
+ * inputs passed to preceding calls to psa_aead_update().
+ *
+ * This function has two output buffers:
+ * - \p ciphertext contains trailing ciphertext that was buffered from
+ *   preceding calls to psa_aead_update().
+ * - \p tag contains the authentication tag. Its length is always
+ *   #PSA_AEAD_TAG_LENGTH(\c alg) where \c alg is the AEAD algorithm
+ *   that the operation performs.
+ *
+ * When this function returns successfuly, the operation becomes inactive.
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_aead_abort().
+ *
+ * \param[in,out] operation     Active AEAD operation.
+ * \param[out] ciphertext       Buffer where the last part of the ciphertext
+ *                              is to be written.
+ * \param ciphertext_size       Size of the \p ciphertext buffer in bytes.
+ *                              This must be at least
+ *                              #PSA_AEAD_FINISH_OUTPUT_SIZE(\c alg) where
+ *                              \c alg is the algorithm that is being
+ *                              calculated.
+ * \param[out] ciphertext_length On success, the number of bytes of
+ *                              returned ciphertext.
+ * \param[out] tag              Buffer where the authentication tag is
+ *                              to be written.
+ * \param tag_size              Size of the \p tag buffer in bytes.
+ *                              This must be at least
+ *                              #PSA_AEAD_TAG_LENGTH(\c alg) where \c alg is
+ *                              the algorithm that is being calculated.
+ * \param[out] tag_length       On success, the number of bytes
+ *                              that make up the returned tag.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be an active encryption
+ *         operation with a nonce set).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p ciphertext or \p tag buffer is too small.
+ *         You can determine a sufficient buffer size for \p ciphertext by
+ *         calling #PSA_AEAD_FINISH_OUTPUT_SIZE(\c alg)
+ *         where \c alg is the algorithm that is being calculated.
+ *         You can determine a sufficient buffer size for \p tag by
+ *         calling #PSA_AEAD_TAG_LENGTH(\c alg).
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The total length of input to psa_aead_update_ad() so far is
+ *         less than the additional data length that was previously
+ *         specified with psa_aead_set_lengths().
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The total length of input to psa_aead_update() so far is
+ *         less than the plaintext length that was previously
+ *         specified with psa_aead_set_lengths().
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_finish(psa_aead_operation_t *operation,
+                             uint8_t *ciphertext,
+                             size_t ciphertext_size,
+                             size_t *ciphertext_length,
+                             uint8_t *tag,
+                             size_t tag_size,
+                             size_t *tag_length);
+
+/** Finish authenticating and decrypting a message in an AEAD operation.
+ *
+ * The operation must have been set up with psa_aead_decrypt_setup().
+ *
+ * This function finishes the authenticated decryption of the message
+ * components:
+ *
+ * -  The additional data consisting of the concatenation of the inputs
+ *    passed to preceding calls to psa_aead_update_ad().
+ * -  The ciphertext consisting of the concatenation of the inputs passed to
+ *    preceding calls to psa_aead_update().
+ * -  The tag passed to this function call.
+ *
+ * If the authentication tag is correct, this function outputs any remaining
+ * plaintext and reports success. If the authentication tag is not correct,
+ * this function returns #PSA_ERROR_INVALID_SIGNATURE.
+ *
+ * When this function returns successfuly, the operation becomes inactive.
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_aead_abort().
+ *
+ * \note Implementations shall make the best effort to ensure that the
+ * comparison between the actual tag and the expected tag is performed
+ * in constant time.
+ *
+ * \param[in,out] operation     Active AEAD operation.
+ * \param[out] plaintext        Buffer where the last part of the plaintext
+ *                              is to be written. This is the remaining data
+ *                              from previous calls to psa_aead_update()
+ *                              that could not be processed until the end
+ *                              of the input.
+ * \param plaintext_size        Size of the \p plaintext buffer in bytes.
+ *                              This must be at least
+ *                              #PSA_AEAD_VERIFY_OUTPUT_SIZE(\c alg) where
+ *                              \c alg is the algorithm that is being
+ *                              calculated.
+ * \param[out] plaintext_length On success, the number of bytes of
+ *                              returned plaintext.
+ * \param[in] tag               Buffer containing the authentication tag.
+ * \param tag_length            Size of the \p tag buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_SIGNATURE
+ *         The calculations were successful, but the authentication tag is
+ *         not correct.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be an active decryption
+ *         operation with a nonce set).
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p plaintext buffer is too small.
+ *         You can determine a sufficient buffer size for \p plaintext by
+ *         calling #PSA_AEAD_VERIFY_OUTPUT_SIZE(\c alg)
+ *         where \c alg is the algorithm that is being calculated.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The total length of input to psa_aead_update_ad() so far is
+ *         less than the additional data length that was previously
+ *         specified with psa_aead_set_lengths().
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The total length of input to psa_aead_update() so far is
+ *         less than the plaintext length that was previously
+ *         specified with psa_aead_set_lengths().
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_verify(psa_aead_operation_t *operation,
+                             uint8_t *plaintext,
+                             size_t plaintext_size,
+                             size_t *plaintext_length,
+                             const uint8_t *tag,
+                             size_t tag_length);
+
+/** Abort an AEAD operation.
+ *
+ * Aborting an operation frees all associated resources except for the
+ * \p operation structure itself. Once aborted, the operation object
+ * can be reused for another operation by calling
+ * psa_aead_encrypt_setup() or psa_aead_decrypt_setup() again.
+ *
+ * You may call this function any time after the operation object has
+ * been initialized as described in #psa_aead_operation_t.
+ *
+ * In particular, calling psa_aead_abort() after the operation has been
+ * terminated by a call to psa_aead_abort(), psa_aead_finish() or
+ * psa_aead_verify() is safe and has no effect.
+ *
+ * \param[in,out] operation     Initialized AEAD operation.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_aead_abort(psa_aead_operation_t *operation);
+
+/**@}*/
+
+/** \defgroup asymmetric Asymmetric cryptography
+ * @{
+ */
+
+/**
+ * \brief Sign a hash or short message with a private key.
+ *
+ * Note that to perform a hash-and-sign signature algorithm, you must
+ * first calculate the hash by calling psa_hash_setup(), psa_hash_update()
+ * and psa_hash_finish(). Then pass the resulting hash as the \p hash
+ * parameter to this function. You can use #PSA_ALG_SIGN_GET_HASH(\p alg)
+ * to determine the hash algorithm to use.
+ *
+ * \param key                   Identifier of the key to use for the operation.
+ *                              It must be an asymmetric key pair. The key must
+ *                              allow the usage #PSA_KEY_USAGE_SIGN_HASH.
+ * \param alg                   A signature algorithm that is compatible with
+ *                              the type of \p key.
+ * \param[in] hash              The hash or message to sign.
+ * \param hash_length           Size of the \p hash buffer in bytes.
+ * \param[out] signature        Buffer where the signature is to be written.
+ * \param signature_size        Size of the \p signature buffer in bytes.
+ * \param[out] signature_length On success, the number of bytes
+ *                              that make up the returned signature value.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p signature buffer is too small. You can
+ *         determine a sufficient buffer size by calling
+ *         #PSA_SIGN_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
+ *         where \c key_type and \c key_bits are the type and bit-size
+ *         respectively of \p key.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_sign_hash(psa_key_id_t key,
+                           psa_algorithm_t alg,
+                           const uint8_t *hash,
+                           size_t hash_length,
+                           uint8_t *signature,
+                           size_t signature_size,
+                           size_t *signature_length);
+
+/**
+ * \brief Verify the signature a hash or short message using a public key.
+ *
+ * Note that to perform a hash-and-sign signature algorithm, you must
+ * first calculate the hash by calling psa_hash_setup(), psa_hash_update()
+ * and psa_hash_finish(). Then pass the resulting hash as the \p hash
+ * parameter to this function. You can use #PSA_ALG_SIGN_GET_HASH(\p alg)
+ * to determine the hash algorithm to use.
+ *
+ * \param key               Identifier of the key to use for the operation. It
+ *                          must be a public key or an asymmetric key pair. The
+ *                          key must allow the usage
+ *                          #PSA_KEY_USAGE_VERIFY_HASH.
+ * \param alg               A signature algorithm that is compatible with
+ *                          the type of \p key.
+ * \param[in] hash          The hash or message whose signature is to be
+ *                          verified.
+ * \param hash_length       Size of the \p hash buffer in bytes.
+ * \param[in] signature     Buffer containing the signature to verify.
+ * \param signature_length  Size of the \p signature buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         The signature is valid.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_SIGNATURE
+ *         The calculation was perfomed successfully, but the passed
+ *         signature is not a valid signature.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_verify_hash(psa_key_id_t key,
+                             psa_algorithm_t alg,
+                             const uint8_t *hash,
+                             size_t hash_length,
+                             const uint8_t *signature,
+                             size_t signature_length);
+
+/**
+ * \brief Encrypt a short message with a public key.
+ *
+ * \param key                   Identifer of the key to use for the operation.
+ *                              It must be a public key or an asymmetric key
+ *                              pair. It must allow the usage
+ *                              #PSA_KEY_USAGE_ENCRYPT.
+ * \param alg                   An asymmetric encryption algorithm that is
+ *                              compatible with the type of \p key.
+ * \param[in] input             The message to encrypt.
+ * \param input_length          Size of the \p input buffer in bytes.
+ * \param[in] salt              A salt or label, if supported by the
+ *                              encryption algorithm.
+ *                              If the algorithm does not support a
+ *                              salt, pass \c NULL.
+ *                              If the algorithm supports an optional
+ *                              salt and you do not want to pass a salt,
+ *                              pass \c NULL.
+ *
+ *                              - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ *                                supported.
+ * \param salt_length           Size of the \p salt buffer in bytes.
+ *                              If \p salt is \c NULL, pass 0.
+ * \param[out] output           Buffer where the encrypted message is to
+ *                              be written.
+ * \param output_size           Size of the \p output buffer in bytes.
+ * \param[out] output_length    On success, the number of bytes
+ *                              that make up the returned output.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p output buffer is too small. You can
+ *         determine a sufficient buffer size by calling
+ *         #PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
+ *         where \c key_type and \c key_bits are the type and bit-size
+ *         respectively of \p key.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_asymmetric_encrypt(psa_key_id_t key,
+                                    psa_algorithm_t alg,
+                                    const uint8_t *input,
+                                    size_t input_length,
+                                    const uint8_t *salt,
+                                    size_t salt_length,
+                                    uint8_t *output,
+                                    size_t output_size,
+                                    size_t *output_length);
+
+/**
+ * \brief Decrypt a short message with a private key.
+ *
+ * \param key                   Identifier of the key to use for the operation.
+ *                              It must be an asymmetric key pair. It must
+ *                              allow the usage #PSA_KEY_USAGE_DECRYPT.
+ * \param alg                   An asymmetric encryption algorithm that is
+ *                              compatible with the type of \p key.
+ * \param[in] input             The message to decrypt.
+ * \param input_length          Size of the \p input buffer in bytes.
+ * \param[in] salt              A salt or label, if supported by the
+ *                              encryption algorithm.
+ *                              If the algorithm does not support a
+ *                              salt, pass \c NULL.
+ *                              If the algorithm supports an optional
+ *                              salt and you do not want to pass a salt,
+ *                              pass \c NULL.
+ *
+ *                              - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ *                                supported.
+ * \param salt_length           Size of the \p salt buffer in bytes.
+ *                              If \p salt is \c NULL, pass 0.
+ * \param[out] output           Buffer where the decrypted message is to
+ *                              be written.
+ * \param output_size           Size of the \c output buffer in bytes.
+ * \param[out] output_length    On success, the number of bytes
+ *                              that make up the returned output.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         The size of the \p output buffer is too small. You can
+ *         determine a sufficient buffer size by calling
+ *         #PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
+ *         where \c key_type and \c key_bits are the type and bit-size
+ *         respectively of \p key.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
+ * \retval #PSA_ERROR_INVALID_PADDING
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_asymmetric_decrypt(psa_key_id_t key,
+                                    psa_algorithm_t alg,
+                                    const uint8_t *input,
+                                    size_t input_length,
+                                    const uint8_t *salt,
+                                    size_t salt_length,
+                                    uint8_t *output,
+                                    size_t output_size,
+                                    size_t *output_length);
+
+/**@}*/
+
+/** \defgroup key_derivation Key derivation and pseudorandom generation
+ * @{
+ */
+
+/** The type of the state data structure for key derivation operations.
+ *
+ * Before calling any function on a key derivation operation object, the
+ * application must initialize it by any of the following means:
+ * - Set the structure to all-bits-zero, for example:
+ *   \code
+ *   psa_key_derivation_operation_t operation;
+ *   memset(&operation, 0, sizeof(operation));
+ *   \endcode
+ * - Initialize the structure to logical zero values, for example:
+ *   \code
+ *   psa_key_derivation_operation_t operation = {0};
+ *   \endcode
+ * - Initialize the structure to the initializer #PSA_KEY_DERIVATION_OPERATION_INIT,
+ *   for example:
+ *   \code
+ *   psa_key_derivation_operation_t operation = PSA_KEY_DERIVATION_OPERATION_INIT;
+ *   \endcode
+ * - Assign the result of the function psa_key_derivation_operation_init()
+ *   to the structure, for example:
+ *   \code
+ *   psa_key_derivation_operation_t operation;
+ *   operation = psa_key_derivation_operation_init();
+ *   \endcode
+ *
+ * This is an implementation-defined \c struct. Applications should not
+ * make any assumptions about the content of this structure except
+ * as directed by the documentation of a specific implementation.
+ */
+typedef struct psa_key_derivation_s psa_key_derivation_operation_t;
+
+/** \def PSA_KEY_DERIVATION_OPERATION_INIT
+ *
+ * This macro returns a suitable initializer for a key derivation operation
+ * object of type #psa_key_derivation_operation_t.
+ */
+#ifdef __DOXYGEN_ONLY__
+/* This is an example definition for documentation purposes.
+ * Implementations should define a suitable value in `crypto_struct.h`.
+ */
+#define PSA_KEY_DERIVATION_OPERATION_INIT {0}
+#endif
+
+/** Return an initial value for a key derivation operation object.
+ */
+static psa_key_derivation_operation_t psa_key_derivation_operation_init(void);
+
+/** Set up a key derivation operation.
+ *
+ * A key derivation algorithm takes some inputs and uses them to generate
+ * a byte stream in a deterministic way.
+ * This byte stream can be used to produce keys and other
+ * cryptographic material.
+ *
+ * To derive a key:
+ * -# Start with an initialized object of type #psa_key_derivation_operation_t.
+ * -# Call psa_key_derivation_setup() to select the algorithm.
+ * -# Provide the inputs for the key derivation by calling
+ *    psa_key_derivation_input_bytes() or psa_key_derivation_input_key()
+ *    as appropriate. Which inputs are needed, in what order, and whether
+ *    they may be keys and if so of what type depends on the algorithm.
+ * -# Optionally set the operation's maximum capacity with
+ *    psa_key_derivation_set_capacity(). You may do this before, in the middle
+ *    of or after providing inputs. For some algorithms, this step is mandatory
+ *    because the output depends on the maximum capacity.
+ * -# To derive a key, call psa_key_derivation_output_key().
+ *    To derive a byte string for a different purpose, call
+ *    psa_key_derivation_output_bytes().
+ *    Successive calls to these functions use successive output bytes
+ *    calculated by the key derivation algorithm.
+ * -# Clean up the key derivation operation object with
+ *    psa_key_derivation_abort().
+ *
+ * If this function returns an error, the key derivation operation object is
+ * not changed.
+ *
+ * If an error occurs at any step after a call to psa_key_derivation_setup(),
+ * the operation will need to be reset by a call to psa_key_derivation_abort().
+ *
+ * Implementations must reject an attempt to derive a key of size 0.
+ *
+ * \param[in,out] operation       The key derivation operation object
+ *                                to set up. It must
+ *                                have been initialized but not set up yet.
+ * \param alg                     The key derivation algorithm to compute
+ *                                (\c PSA_ALG_XXX value such that
+ *                                #PSA_ALG_IS_KEY_DERIVATION(\p alg) is true).
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \c alg is not a key derivation algorithm.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \c alg is not supported or is not a key derivation algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be inactive).
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_setup(
+    psa_key_derivation_operation_t *operation,
+    psa_algorithm_t alg);
+
+/** Retrieve the current capacity of a key derivation operation.
+ *
+ * The capacity of a key derivation is the maximum number of bytes that it can
+ * return. When you get *N* bytes of output from a key derivation operation,
+ * this reduces its capacity by *N*.
+ *
+ * \param[in] operation     The operation to query.
+ * \param[out] capacity     On success, the capacity of the operation.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active).
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_get_capacity(
+    const psa_key_derivation_operation_t *operation,
+    size_t *capacity);
+
+/** Set the maximum capacity of a key derivation operation.
+ *
+ * The capacity of a key derivation operation is the maximum number of bytes
+ * that the key derivation operation can return from this point onwards.
+ *
+ * \param[in,out] operation The key derivation operation object to modify.
+ * \param capacity          The new capacity of the operation.
+ *                          It must be less or equal to the operation's
+ *                          current capacity.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p capacity is larger than the operation's current capacity.
+ *         In this case, the operation object remains valid and its capacity
+ *         remains unchanged.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active).
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_set_capacity(
+    psa_key_derivation_operation_t *operation,
+    size_t capacity);
+
+/** Use the maximum possible capacity for a key derivation operation.
+ *
+ * Use this value as the capacity argument when setting up a key derivation
+ * to indicate that the operation should have the maximum possible capacity.
+ * The value of the maximum possible capacity depends on the key derivation
+ * algorithm.
+ */
+#define PSA_KEY_DERIVATION_UNLIMITED_CAPACITY ((size_t)(-1))
+
+/** Provide an input for key derivation or key agreement.
+ *
+ * Which inputs are required and in what order depends on the algorithm.
+ * Refer to the documentation of each key derivation or key agreement
+ * algorithm for information.
+ *
+ * This function passes direct inputs, which is usually correct for
+ * non-secret inputs. To pass a secret input, which should be in a key
+ * object, call psa_key_derivation_input_key() instead of this function.
+ * Refer to the documentation of individual step types
+ * (`PSA_KEY_DERIVATION_INPUT_xxx` values of type ::psa_key_derivation_step_t)
+ * for more information.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_key_derivation_abort().
+ *
+ * \param[in,out] operation       The key derivation operation object to use.
+ *                                It must have been set up with
+ *                                psa_key_derivation_setup() and must not
+ *                                have produced any output yet.
+ * \param step                    Which step the input data is for.
+ * \param[in] data                Input data to use.
+ * \param data_length             Size of the \p data buffer in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \c step is not compatible with the operation's algorithm.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \c step does not allow direct inputs.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid for this input \p step.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_input_bytes(
+    psa_key_derivation_operation_t *operation,
+    psa_key_derivation_step_t step,
+    const uint8_t *data,
+    size_t data_length);
+
+/** Provide an input for key derivation in the form of a key.
+ *
+ * Which inputs are required and in what order depends on the algorithm.
+ * Refer to the documentation of each key derivation or key agreement
+ * algorithm for information.
+ *
+ * This function obtains input from a key object, which is usually correct for
+ * secret inputs or for non-secret personalization strings kept in the key
+ * store. To pass a non-secret parameter which is not in the key store,
+ * call psa_key_derivation_input_bytes() instead of this function.
+ * Refer to the documentation of individual step types
+ * (`PSA_KEY_DERIVATION_INPUT_xxx` values of type ::psa_key_derivation_step_t)
+ * for more information.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_key_derivation_abort().
+ *
+ * \param[in,out] operation       The key derivation operation object to use.
+ *                                It must have been set up with
+ *                                psa_key_derivation_setup() and must not
+ *                                have produced any output yet.
+ * \param step                    Which step the input data is for.
+ * \param key                     Identifier of the key. It must have an
+ *                                appropriate type for step and must allow the
+ *                                usage #PSA_KEY_USAGE_DERIVE.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \c step is not compatible with the operation's algorithm.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \c step does not allow key inputs of the given type
+ *         or does not allow key inputs at all.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid for this input \p step.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_input_key(
+    psa_key_derivation_operation_t *operation,
+    psa_key_derivation_step_t step,
+    psa_key_id_t key);
+
+/** Perform a key agreement and use the shared secret as input to a key
+ * derivation.
+ *
+ * A key agreement algorithm takes two inputs: a private key \p private_key
+ * a public key \p peer_key.
+ * The result of this function is passed as input to a key derivation.
+ * The output of this key derivation can be extracted by reading from the
+ * resulting operation to produce keys and other cryptographic material.
+ *
+ * If this function returns an error status, the operation enters an error
+ * state and must be aborted by calling psa_key_derivation_abort().
+ *
+ * \param[in,out] operation       The key derivation operation object to use.
+ *                                It must have been set up with
+ *                                psa_key_derivation_setup() with a
+ *                                key agreement and derivation algorithm
+ *                                \c alg (\c PSA_ALG_XXX value such that
+ *                                #PSA_ALG_IS_KEY_AGREEMENT(\c alg) is true
+ *                                and #PSA_ALG_IS_RAW_KEY_AGREEMENT(\c alg)
+ *                                is false).
+ *                                The operation must be ready for an
+ *                                input of the type given by \p step.
+ * \param step                    Which step the input data is for.
+ * \param private_key             Identifier of the private key to use. It must
+ *                                allow the usage #PSA_KEY_USAGE_DERIVE.
+ * \param[in] peer_key      Public key of the peer. The peer key must be in the
+ *                          same format that psa_import_key() accepts for the
+ *                          public key type corresponding to the type of
+ *                          private_key. That is, this function performs the
+ *                          equivalent of
+ *                          #psa_import_key(...,
+ *                          `peer_key`, `peer_key_length`) where
+ *                          with key attributes indicating the public key
+ *                          type corresponding to the type of `private_key`.
+ *                          For example, for EC keys, this means that peer_key
+ *                          is interpreted as a point on the curve that the
+ *                          private key is on. The standard formats for public
+ *                          keys are documented in the documentation of
+ *                          psa_export_public_key().
+ * \param peer_key_length         Size of \p peer_key in bytes.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid for this key agreement \p step.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \c private_key is not compatible with \c alg,
+ *         or \p peer_key is not valid for \c alg or not compatible with
+ *         \c private_key.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \c alg is not supported or is not a key derivation algorithm.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \c step does not allow an input resulting from a key agreement.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_key_agreement(
+    psa_key_derivation_operation_t *operation,
+    psa_key_derivation_step_t step,
+    psa_key_id_t private_key,
+    const uint8_t *peer_key,
+    size_t peer_key_length);
+
+/** Read some data from a key derivation operation.
+ *
+ * This function calculates output bytes from a key derivation algorithm and
+ * return those bytes.
+ * If you view the key derivation's output as a stream of bytes, this
+ * function destructively reads the requested number of bytes from the
+ * stream.
+ * The operation's capacity decreases by the number of bytes read.
+ *
+ * If this function returns an error status other than
+ * #PSA_ERROR_INSUFFICIENT_DATA, the operation enters an error
+ * state and must be aborted by calling psa_key_derivation_abort().
+ *
+ * \param[in,out] operation The key derivation operation object to read from.
+ * \param[out] output       Buffer where the output will be written.
+ * \param output_length     Number of bytes to output.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_INSUFFICIENT_DATA
+ *                          The operation's capacity was less than
+ *                          \p output_length bytes. Note that in this case,
+ *                          no output is written to the output buffer.
+ *                          The operation's capacity is set to 0, thus
+ *                          subsequent calls to this function will not
+ *                          succeed, even with a smaller output buffer.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active and completed
+ *         all required input steps).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_output_bytes(
+    psa_key_derivation_operation_t *operation,
+    uint8_t *output,
+    size_t output_length);
+
+/** Derive a key from an ongoing key derivation operation.
+ *
+ * This function calculates output bytes from a key derivation algorithm
+ * and uses those bytes to generate a key deterministically.
+ * The key's location, usage policy, type and size are taken from
+ * \p attributes.
+ *
+ * If you view the key derivation's output as a stream of bytes, this
+ * function destructively reads as many bytes as required from the
+ * stream.
+ * The operation's capacity decreases by the number of bytes read.
+ *
+ * If this function returns an error status other than
+ * #PSA_ERROR_INSUFFICIENT_DATA, the operation enters an error
+ * state and must be aborted by calling psa_key_derivation_abort().
+ *
+ * How much output is produced and consumed from the operation, and how
+ * the key is derived, depends on the key type:
+ *
+ * - For key types for which the key is an arbitrary sequence of bytes
+ *   of a given size, this function is functionally equivalent to
+ *   calling #psa_key_derivation_output_bytes
+ *   and passing the resulting output to #psa_import_key.
+ *   However, this function has a security benefit:
+ *   if the implementation provides an isolation boundary then
+ *   the key material is not exposed outside the isolation boundary.
+ *   As a consequence, for these key types, this function always consumes
+ *   exactly (\p bits / 8) bytes from the operation.
+ *   The following key types defined in this specification follow this scheme:
+ *
+ *     - #PSA_KEY_TYPE_AES;
+ *     - #PSA_KEY_TYPE_ARC4;
+ *     - #PSA_KEY_TYPE_CAMELLIA;
+ *     - #PSA_KEY_TYPE_DERIVE;
+ *     - #PSA_KEY_TYPE_HMAC.
+ *
+ * - For ECC keys on a Montgomery elliptic curve
+ *   (#PSA_KEY_TYPE_ECC_KEY_PAIR(\c curve) where \c curve designates a
+ *   Montgomery curve), this function always draws a byte string whose
+ *   length is determined by the curve, and sets the mandatory bits
+ *   accordingly. That is:
+ *
+ *     - Curve25519 (#PSA_ECC_FAMILY_MONTGOMERY, 255 bits): draw a 32-byte
+ *       string and process it as specified in RFC 7748 &sect;5.
+ *     - Curve448 (#PSA_ECC_FAMILY_MONTGOMERY, 448 bits): draw a 56-byte
+ *       string and process it as specified in RFC 7748 &sect;5.
+ *
+ * - For key types for which the key is represented by a single sequence of
+ *   \p bits bits with constraints as to which bit sequences are acceptable,
+ *   this function draws a byte string of length (\p bits / 8) bytes rounded
+ *   up to the nearest whole number of bytes. If the resulting byte string
+ *   is acceptable, it becomes the key, otherwise the drawn bytes are discarded.
+ *   This process is repeated until an acceptable byte string is drawn.
+ *   The byte string drawn from the operation is interpreted as specified
+ *   for the output produced by psa_export_key().
+ *   The following key types defined in this specification follow this scheme:
+ *
+ *     - #PSA_KEY_TYPE_DES.
+ *       Force-set the parity bits, but discard forbidden weak keys.
+ *       For 2-key and 3-key triple-DES, the three keys are generated
+ *       successively (for example, for 3-key triple-DES,
+ *       if the first 8 bytes specify a weak key and the next 8 bytes do not,
+ *       discard the first 8 bytes, use the next 8 bytes as the first key,
+ *       and continue reading output from the operation to derive the other
+ *       two keys).
+ *     - Finite-field Diffie-Hellman keys (#PSA_KEY_TYPE_DH_KEY_PAIR(\c group)
+ *       where \c group designates any Diffie-Hellman group) and
+ *       ECC keys on a Weierstrass elliptic curve
+ *       (#PSA_KEY_TYPE_ECC_KEY_PAIR(\c curve) where \c curve designates a
+ *       Weierstrass curve).
+ *       For these key types, interpret the byte string as integer
+ *       in big-endian order. Discard it if it is not in the range
+ *       [0, *N* - 2] where *N* is the boundary of the private key domain
+ *       (the prime *p* for Diffie-Hellman, the subprime *q* for DSA,
+ *       or the order of the curve's base point for ECC).
+ *       Add 1 to the resulting integer and use this as the private key *x*.
+ *       This method allows compliance to NIST standards, specifically
+ *       the methods titled "key-pair generation by testing candidates"
+ *       in NIST SP 800-56A &sect;5.6.1.1.4 for Diffie-Hellman,
+ *       in FIPS 186-4 &sect;B.1.2 for DSA, and
+ *       in NIST SP 800-56A &sect;5.6.1.2.2 or
+ *       FIPS 186-4 &sect;B.4.2 for elliptic curve keys.
+ *
+ * - For other key types, including #PSA_KEY_TYPE_RSA_KEY_PAIR,
+ *   the way in which the operation output is consumed is
+ *   implementation-defined.
+ *
+ * In all cases, the data that is read is discarded from the operation.
+ * The operation's capacity is decreased by the number of bytes read.
+ *
+ * For algorithms that take an input step #PSA_KEY_DERIVATION_INPUT_SECRET,
+ * the input to that step must be provided with psa_key_derivation_input_key().
+ * Future versions of this specification may include additional restrictions
+ * on the derived key based on the attributes and strength of the secret key.
+ *
+ * \param[in] attributes    The attributes for the new key.
+ * \param[in,out] operation The key derivation operation object to read from.
+ * \param[out] key          On success, an identifier for the newly created
+ *                          key. For persistent keys, this is the key
+ *                          identifier defined in \p attributes.
+ *                          \c 0 on failure.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ *         If the key is persistent, the key material and the key's metadata
+ *         have been saved to persistent storage.
+ * \retval #PSA_ERROR_ALREADY_EXISTS
+ *         This is an attempt to create a persistent key, and there is
+ *         already a persistent key with the given identifier.
+ * \retval #PSA_ERROR_INSUFFICIENT_DATA
+ *         There was not enough data to create the desired key.
+ *         Note that in this case, no output is written to the output buffer.
+ *         The operation's capacity is set to 0, thus subsequent calls to
+ *         this function will not succeed, even with a smaller output buffer.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         The key type or key size is not supported, either by the
+ *         implementation in general or in this particular location.
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         The provided key attributes are not valid for the operation.
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ *         The #PSA_KEY_DERIVATION_INPUT_SECRET input was not provided through
+ *         a key.
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The operation state is not valid (it must be active and completed
+ *         all required input steps).
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_INSUFFICIENT_STORAGE
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_DATA_INVALID
+ * \retval #PSA_ERROR_DATA_CORRUPT
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_output_key(
+    const psa_key_attributes_t *attributes,
+    psa_key_derivation_operation_t *operation,
+    psa_key_id_t *key);
+
+/** Abort a key derivation operation.
+ *
+ * Aborting an operation frees all associated resources except for the \c
+ * operation structure itself. Once aborted, the operation object can be reused
+ * for another operation by calling psa_key_derivation_setup() again.
+ *
+ * This function may be called at any time after the operation
+ * object has been initialized as described in #psa_key_derivation_operation_t.
+ *
+ * In particular, it is valid to call psa_key_derivation_abort() twice, or to
+ * call psa_key_derivation_abort() on an operation that has not been set up.
+ *
+ * \param[in,out] operation    The operation to abort.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_key_derivation_abort(
+    psa_key_derivation_operation_t *operation);
+
+/** Perform a key agreement and return the raw shared secret.
+ *
+ * \warning The raw result of a key agreement algorithm such as finite-field
+ * Diffie-Hellman or elliptic curve Diffie-Hellman has biases and should
+ * not be used directly as key material. It should instead be passed as
+ * input to a key derivation algorithm. To chain a key agreement with
+ * a key derivation, use psa_key_derivation_key_agreement() and other
+ * functions from the key derivation interface.
+ *
+ * \param alg                     The key agreement algorithm to compute
+ *                                (\c PSA_ALG_XXX value such that
+ *                                #PSA_ALG_IS_RAW_KEY_AGREEMENT(\p alg)
+ *                                is true).
+ * \param private_key             Identifier of the private key to use. It must
+ *                                allow the usage #PSA_KEY_USAGE_DERIVE.
+ * \param[in] peer_key            Public key of the peer. It must be
+ *                                in the same format that psa_import_key()
+ *                                accepts. The standard formats for public
+ *                                keys are documented in the documentation
+ *                                of psa_export_public_key().
+ * \param peer_key_length         Size of \p peer_key in bytes.
+ * \param[out] output             Buffer where the decrypted message is to
+ *                                be written.
+ * \param output_size             Size of the \c output buffer in bytes.
+ * \param[out] output_length      On success, the number of bytes
+ *                                that make up the returned output.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ * \retval #PSA_ERROR_INVALID_HANDLE
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p alg is not a key agreement algorithm
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ *         \p private_key is not compatible with \p alg,
+ *         or \p peer_key is not valid for \p alg or not compatible with
+ *         \p private_key.
+ * \retval #PSA_ERROR_BUFFER_TOO_SMALL
+ *         \p output_size is too small
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ *         \p alg is not a supported key agreement algorithm.
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_raw_key_agreement(psa_algorithm_t alg,
+                                   psa_key_id_t private_key,
+                                   const uint8_t *peer_key,
+                                   size_t peer_key_length,
+                                   uint8_t *output,
+                                   size_t output_size,
+                                   size_t *output_length);
+
+/**@}*/
+
+/** \defgroup random Random generation
+ * @{
+ */
+
+/**
+ * \brief Generate random bytes.
+ *
+ * \warning This function **can** fail! Callers MUST check the return status
+ *          and MUST NOT use the content of the output buffer if the return
+ *          status is not #PSA_SUCCESS.
+ *
+ * \note    To generate a key, use psa_generate_key() instead.
+ *
+ * \param[out] output       Output buffer for the generated data.
+ * \param output_size       Number of bytes to generate and output.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_generate_random(uint8_t *output,
+                                 size_t output_size);
+
+/**
+ * \brief Generate a key or key pair.
+ *
+ * The key is generated randomly.
+ * Its location, usage policy, type and size are taken from \p attributes.
+ *
+ * Implementations must reject an attempt to generate a key of size 0.
+ *
+ * The following type-specific considerations apply:
+ * - For RSA keys (#PSA_KEY_TYPE_RSA_KEY_PAIR),
+ *   the public exponent is 65537.
+ *   The modulus is a product of two probabilistic primes
+ *   between 2^{n-1} and 2^n where n is the bit size specified in the
+ *   attributes.
+ *
+ * \param[in] attributes    The attributes for the new key.
+ * \param[out] key          On success, an identifier for the newly created
+ *                          key. For persistent keys, this is the key
+ *                          identifier defined in \p attributes.
+ *                          \c 0 on failure.
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ *         If the key is persistent, the key material and the key's metadata
+ *         have been saved to persistent storage.
+ * \retval #PSA_ERROR_ALREADY_EXISTS
+ *         This is an attempt to create a persistent key, and there is
+ *         already a persistent key with the given identifier.
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_INVALID_ARGUMENT
+ * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
+ * \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_CORRUPTION_DETECTED
+ * \retval #PSA_ERROR_INSUFFICIENT_STORAGE
+ * \retval #PSA_ERROR_DATA_INVALID
+ * \retval #PSA_ERROR_DATA_CORRUPT
+ * \retval #PSA_ERROR_STORAGE_FAILURE
+ * \retval #PSA_ERROR_BAD_STATE
+ *         The library has not been previously initialized by psa_crypto_init().
+ *         It is implementation-dependent whether a failure to initialize
+ *         results in this error code.
+ */
+psa_status_t psa_generate_key(const psa_key_attributes_t *attributes,
+                              psa_key_id_t *key);
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+/* The file "crypto_sizes.h" contains definitions for size calculation
+ * macros whose definitions are implementation-specific. */
+#include "psa/crypto_sizes.h"
+
+/* The file "crypto_client_struct.h" contains definitions for structures
+ * whose definitions differ in the client view and the PSA server
+ * implementation in TF-M. */
+#include "psa/crypto_client_struct.h"
+
+
+/* The file "crypto_struct.h" contains definitions for
+ * implementation-specific structs that are declared above. */
+#include "psa/crypto_struct.h"
+
+/* The file "crypto_extra.h" contains vendor-specific definitions. This
+ * can include vendor-defined algorithms, extra functions, etc. */
+#include "psa/crypto_extra.h"
+
+#endif /* PSA_CRYPTO_H */
diff --git a/components/service/crypto/include/psa/crypto_client_struct.h b/components/service/crypto/include/psa/crypto_client_struct.h
new file mode 100644
index 0000000..abd420c
--- /dev/null
+++ b/components/service/crypto/include/psa/crypto_client_struct.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2020-2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+/**
+ * \file psa/crypto_client_struct.h
+ *
+ * \brief PSA cryptography client key attribute definitions
+ *
+ * \note This file may not be included directly. Applications must
+ * include psa/crypto.h.
+ *
+ * This file contains the definitions of some data structures with
+ * PSA crypto client specific definitions. This is for implementations
+ * with isolation between the Client applications and the Crypto
+ * Server module, it is expected that the front-end and the back-end
+ * would have different versions of the data structure.
+ */
+#ifndef PSA_CRYPTO_CLIENT_STRUCT_H
+#define PSA_CRYPTO_CLIENT_STRUCT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* This is the client view of the `key_attributes` structure. Only
+ * fields which need to be set by the PSA crypto client are present.
+ * The PSA crypto service will maintain a different version of the
+ * data structure internally. */
+struct psa_client_key_attributes_s
+{
+    uint32_t lifetime;
+    uint32_t id;
+    uint32_t alg;
+    uint32_t usage;
+    size_t bits;
+    uint16_t type;
+};
+
+#define PSA_CLIENT_KEY_ATTRIBUTES_INIT {0, 0, 0, 0, 0, 0}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PSA_CRYPTO_CLIENT_STRUCT_H */
diff --git a/components/service/crypto/include/psa/crypto_compat.h b/components/service/crypto/include/psa/crypto_compat.h
new file mode 100644
index 0000000..e603430
--- /dev/null
+++ b/components/service/crypto/include/psa/crypto_compat.h
@@ -0,0 +1,212 @@
+/*
+ * Copyright (c) 2019-2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+/**
+ * \file psa/crypto_compat.h
+ *
+ * \brief PSA cryptography module: Backward compatibility aliases
+ *
+ * This header declares alternative names for macro and functions.
+ * New application code should not use these names.
+ * These names may be removed in a future version of Mbed Crypto.
+ *
+ * \note This file may not be included directly. Applications must
+ * include psa/crypto.h.
+ */
+
+#ifndef PSA_CRYPTO_COMPAT_H
+#define PSA_CRYPTO_COMPAT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(MBEDTLS_DEPRECATED_REMOVED)
+
+/*
+ * Mechanism for declaring deprecated values
+ */
+#if defined(MBEDTLS_DEPRECATED_WARNING) && !defined(MBEDTLS_PSA_DEPRECATED)
+#define MBEDTLS_PSA_DEPRECATED __attribute__((deprecated))
+#else
+#define MBEDTLS_PSA_DEPRECATED
+#endif
+
+typedef MBEDTLS_PSA_DEPRECATED size_t mbedtls_deprecated_size_t;
+typedef MBEDTLS_PSA_DEPRECATED psa_status_t mbedtls_deprecated_psa_status_t;
+typedef MBEDTLS_PSA_DEPRECATED psa_key_usage_t mbedtls_deprecated_psa_key_usage_t;
+typedef MBEDTLS_PSA_DEPRECATED psa_ecc_family_t mbedtls_deprecated_psa_ecc_family_t;
+typedef MBEDTLS_PSA_DEPRECATED psa_dh_family_t mbedtls_deprecated_psa_dh_family_t;
+typedef MBEDTLS_PSA_DEPRECATED psa_ecc_family_t psa_ecc_curve_t;
+typedef MBEDTLS_PSA_DEPRECATED psa_dh_family_t psa_dh_group_t;
+
+#define PSA_KEY_TYPE_GET_CURVE PSA_KEY_TYPE_ECC_GET_FAMILY
+#define PSA_KEY_TYPE_GET_GROUP PSA_KEY_TYPE_DH_GET_FAMILY
+
+#define MBEDTLS_DEPRECATED_CONSTANT( type, value )      \
+    ( (mbedtls_deprecated_##type) ( value ) )
+
+/*
+ * Deprecated PSA Crypto error code definitions (PSA Crypto API  <= 1.0 beta2)
+ */
+#define PSA_ERROR_UNKNOWN_ERROR \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_status_t, PSA_ERROR_GENERIC_ERROR )
+#define PSA_ERROR_OCCUPIED_SLOT \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_status_t, PSA_ERROR_ALREADY_EXISTS )
+#define PSA_ERROR_EMPTY_SLOT \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_status_t, PSA_ERROR_DOES_NOT_EXIST )
+#define PSA_ERROR_INSUFFICIENT_CAPACITY \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_status_t, PSA_ERROR_INSUFFICIENT_DATA )
+#define PSA_ERROR_TAMPERING_DETECTED \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_status_t, PSA_ERROR_CORRUPTION_DETECTED )
+
+/*
+ * Deprecated PSA Crypto numerical encodings (PSA Crypto API  <= 1.0 beta3)
+ */
+#define PSA_KEY_USAGE_SIGN \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_key_usage_t, PSA_KEY_USAGE_SIGN_HASH )
+#define PSA_KEY_USAGE_VERIFY \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_key_usage_t, PSA_KEY_USAGE_VERIFY_HASH )
+
+/*
+ * Deprecated PSA Crypto size calculation macros (PSA Crypto API  <= 1.0 beta3)
+ */
+#define PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE \
+    MBEDTLS_DEPRECATED_CONSTANT( size_t, PSA_SIGNATURE_MAX_SIZE )
+#define PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE( key_type, key_bits, alg ) \
+    MBEDTLS_DEPRECATED_CONSTANT( size_t, PSA_SIGN_OUTPUT_SIZE( key_type, key_bits, alg ) )
+
+/*
+ * Deprecated PSA Crypto function names (PSA Crypto API  <= 1.0 beta3)
+ */
+MBEDTLS_PSA_DEPRECATED psa_status_t psa_asymmetric_sign( psa_key_handle_t key,
+                            psa_algorithm_t alg,
+                            const uint8_t *hash,
+                            size_t hash_length,
+                            uint8_t *signature,
+                            size_t signature_size,
+                            size_t *signature_length );
+
+MBEDTLS_PSA_DEPRECATED psa_status_t psa_asymmetric_verify( psa_key_handle_t key,
+                              psa_algorithm_t alg,
+                              const uint8_t *hash,
+                              size_t hash_length,
+                              const uint8_t *signature,
+                              size_t signature_length );
+
+#endif /* MBEDTLS_DEPRECATED_REMOVED */
+
+/*
+ * Size-specific elliptic curve families.
+ */
+#define PSA_ECC_CURVE_SECP160K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_K1 )
+#define PSA_ECC_CURVE_SECP192K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_K1 )
+#define PSA_ECC_CURVE_SECP224K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_K1 )
+#define PSA_ECC_CURVE_SECP256K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_K1 )
+#define PSA_ECC_CURVE_SECP160R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R1 )
+#define PSA_ECC_CURVE_SECP192R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R1 )
+#define PSA_ECC_CURVE_SECP224R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R1 )
+#define PSA_ECC_CURVE_SECP256R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R1 )
+#define PSA_ECC_CURVE_SECP384R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R1 )
+#define PSA_ECC_CURVE_SECP521R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R1 )
+#define PSA_ECC_CURVE_SECP160R2 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R2 )
+#define PSA_ECC_CURVE_SECT163K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_K1 )
+#define PSA_ECC_CURVE_SECT233K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_K1 )
+#define PSA_ECC_CURVE_SECT239K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_K1 )
+#define PSA_ECC_CURVE_SECT283K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_K1 )
+#define PSA_ECC_CURVE_SECT409K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_K1 )
+#define PSA_ECC_CURVE_SECT571K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_K1 )
+#define PSA_ECC_CURVE_SECT163R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R1 )
+#define PSA_ECC_CURVE_SECT193R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R1 )
+#define PSA_ECC_CURVE_SECT233R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R1 )
+#define PSA_ECC_CURVE_SECT283R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R1 )
+#define PSA_ECC_CURVE_SECT409R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R1 )
+#define PSA_ECC_CURVE_SECT571R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R1 )
+#define PSA_ECC_CURVE_SECT163R2 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R2 )
+#define PSA_ECC_CURVE_SECT193R2 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R2 )
+#define PSA_ECC_CURVE_BRAINPOOL_P256R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_BRAINPOOL_P_R1 )
+#define PSA_ECC_CURVE_BRAINPOOL_P384R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_BRAINPOOL_P_R1 )
+#define PSA_ECC_CURVE_BRAINPOOL_P512R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_BRAINPOOL_P_R1 )
+#define PSA_ECC_CURVE_CURVE25519 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_MONTGOMERY )
+#define PSA_ECC_CURVE_CURVE448 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_MONTGOMERY )
+
+/*
+ * Curves that changed name due to PSA specification.
+ */
+#define PSA_ECC_CURVE_SECP_K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_K1 )
+#define PSA_ECC_CURVE_SECP_R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R1 )
+#define PSA_ECC_CURVE_SECP_R2 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECP_R2 )
+#define PSA_ECC_CURVE_SECT_K1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_K1 )
+#define PSA_ECC_CURVE_SECT_R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R1 )
+#define PSA_ECC_CURVE_SECT_R2 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_SECT_R2 )
+#define PSA_ECC_CURVE_BRAINPOOL_P_R1 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_BRAINPOOL_P_R1 )
+#define PSA_ECC_CURVE_MONTGOMERY \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_ecc_family_t, PSA_ECC_FAMILY_MONTGOMERY )
+
+/*
+ * Finite-field Diffie-Hellman families.
+ */
+#define PSA_DH_GROUP_FFDHE2048 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_dh_family_t, PSA_DH_FAMILY_RFC7919 )
+#define PSA_DH_GROUP_FFDHE3072 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_dh_family_t, PSA_DH_FAMILY_RFC7919 )
+#define PSA_DH_GROUP_FFDHE4096 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_dh_family_t, PSA_DH_FAMILY_RFC7919 )
+#define PSA_DH_GROUP_FFDHE6144 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_dh_family_t, PSA_DH_FAMILY_RFC7919 )
+#define PSA_DH_GROUP_FFDHE8192 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_dh_family_t, PSA_DH_FAMILY_RFC7919 )
+
+/*
+ * Diffie-Hellman families that changed name due to PSA specification.
+ */
+#define PSA_DH_GROUP_RFC7919 \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_dh_family_t, PSA_DH_FAMILY_RFC7919 )
+#define PSA_DH_GROUP_CUSTOM \
+    MBEDTLS_DEPRECATED_CONSTANT( psa_dh_family_t, PSA_DH_FAMILY_CUSTOM )
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PSA_CRYPTO_COMPAT_H */
diff --git a/components/service/crypto/include/psa/crypto_extra.h b/components/service/crypto/include/psa/crypto_extra.h
new file mode 100644
index 0000000..fc908d9
--- /dev/null
+++ b/components/service/crypto/include/psa/crypto_extra.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2018-2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+/**
+ * \file psa/crypto_extra.h
+ *
+ * \brief PSA cryptography module: vendor extensions
+ *
+ * \note This file may not be included directly. Applications must
+ * include psa/crypto.h.
+ *
+ * This file is reserved for vendor-specific definitions.
+ */
+
+#ifndef PSA_CRYPTO_EXTRA_H
+#define PSA_CRYPTO_EXTRA_H
+
+#include "psa/crypto_compat.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \addtogroup crypto_types
+ * @{
+ */
+
+/** DSA public key.
+ *
+ * The import and export format is the
+ * representation of the public key `y = g^x mod p` as a big-endian byte
+ * string. The length of the byte string is the length of the base prime `p`
+ * in bytes.
+ */
+#define PSA_KEY_TYPE_DSA_PUBLIC_KEY                 ((psa_key_type_t)0x4002)
+
+/** DSA key pair (private and public key).
+ *
+ * The import and export format is the
+ * representation of the private key `x` as a big-endian byte string. The
+ * length of the byte string is the private key size in bytes (leading zeroes
+ * are not stripped).
+ *
+ * Determinstic DSA key derivation with psa_generate_derived_key follows
+ * FIPS 186-4 &sect;B.1.2: interpret the byte string as integer
+ * in big-endian order. Discard it if it is not in the range
+ * [0, *N* - 2] where *N* is the boundary of the private key domain
+ * (the prime *p* for Diffie-Hellman, the subprime *q* for DSA,
+ * or the order of the curve's base point for ECC).
+ * Add 1 to the resulting integer and use this as the private key *x*.
+ *
+ */
+#define PSA_KEY_TYPE_DSA_KEY_PAIR                    ((psa_key_type_t)0x7002)
+
+/**@}*/
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PSA_CRYPTO_EXTRA_H */
diff --git a/components/service/crypto/include/psa/crypto_sizes.h b/components/service/crypto/include/psa/crypto_sizes.h
new file mode 100644
index 0000000..7a0149b
--- /dev/null
+++ b/components/service/crypto/include/psa/crypto_sizes.h
@@ -0,0 +1,1070 @@
+/*
+ * Copyright (c) 2018-2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+/**
+ * \file psa/crypto_sizes.h
+ *
+ * \brief PSA cryptography module: Mbed TLS buffer size macros
+ *
+ * \note This file may not be included directly. Applications must
+ * include psa/crypto.h.
+ *
+ * This file contains the definitions of macros that are useful to
+ * compute buffer sizes. The signatures and semantics of these macros
+ * are standardized, but the definitions are not, because they depend on
+ * the available algorithms and, in some cases, on permitted tolerances
+ * on buffer sizes.
+ *
+ * In implementations with isolation between the application and the
+ * cryptography module, implementers should take care to ensure that
+ * the definitions that are exposed to applications match what the
+ * module implements.
+ *
+ * Macros that compute sizes whose values do not depend on the
+ * implementation are in crypto.h.
+ */
+
+#ifndef PSA_CRYPTO_SIZES_H
+#define PSA_CRYPTO_SIZES_H
+
+#define PSA_BITS_TO_BYTES(bits) (((bits) + 7) / 8)
+#define PSA_BYTES_TO_BITS(bytes) ((bytes) * 8)
+
+#define PSA_ROUND_UP_TO_MULTIPLE(block_size, length) \
+    (((length) + (block_size) - 1) / (block_size) * (block_size))
+
+/** The size of the output of psa_hash_finish(), in bytes.
+ *
+ * This is also the hash size that psa_hash_verify() expects.
+ *
+ * \param alg   A hash algorithm (\c PSA_ALG_XXX value such that
+ *              #PSA_ALG_IS_HASH(\p alg) is true), or an HMAC algorithm
+ *              (#PSA_ALG_HMAC(\c hash_alg) where \c hash_alg is a
+ *              hash algorithm).
+ *
+ * \return The hash size for the specified hash algorithm.
+ *         If the hash algorithm is not recognized, return 0.
+ */
+#define PSA_HASH_LENGTH(alg)                                        \
+    (                                                               \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_MD2 ? 16 :            \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_MD4 ? 16 :            \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_MD5 ? 16 :            \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_RIPEMD160 ? 20 :      \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA_1 ? 20 :          \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA_224 ? 28 :        \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA_256 ? 32 :        \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA_384 ? 48 :        \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA_512 ? 64 :        \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA_512_224 ? 28 :    \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA_512_256 ? 32 :    \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA3_224 ? 28 :       \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA3_256 ? 32 :       \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA3_384 ? 48 :       \
+        PSA_ALG_HMAC_GET_HASH(alg) == PSA_ALG_SHA3_512 ? 64 :       \
+        0)
+
+/** \def PSA_HASH_MAX_SIZE
+ *
+ * Maximum size of a hash.
+ *
+ * This macro expands to a compile-time constant integer. This value
+ * is the maximum size of a hash in bytes.
+ */
+/* Note: for HMAC-SHA-3, the block size is 144 bytes for HMAC-SHA3-226,
+ * 136 bytes for HMAC-SHA3-256, 104 bytes for SHA3-384, 72 bytes for
+ * HMAC-SHA3-512. */
+#if defined(MBEDTLS_SHA512_C)
+#define PSA_HASH_MAX_SIZE 64
+#define PSA_HMAC_MAX_HASH_BLOCK_SIZE 128
+#else
+#define PSA_HASH_MAX_SIZE 32
+#define PSA_HMAC_MAX_HASH_BLOCK_SIZE 64
+#endif
+
+/** \def PSA_MAC_MAX_SIZE
+ *
+ * Maximum size of a MAC.
+ *
+ * This macro expands to a compile-time constant integer. This value
+ * is the maximum size of a MAC in bytes.
+ */
+/* All non-HMAC MACs have a maximum size that's smaller than the
+ * minimum possible value of PSA_HASH_MAX_SIZE in this implementation. */
+/* Note that the encoding of truncated MAC algorithms limits this value
+ * to 64 bytes.
+ */
+#define PSA_MAC_MAX_SIZE PSA_HASH_MAX_SIZE
+
+/** The tag size for an AEAD algorithm, in bytes.
+ *
+ * \param alg                 An AEAD algorithm
+ *                            (\c PSA_ALG_XXX value such that
+ *                            #PSA_ALG_IS_AEAD(\p alg) is true).
+ *
+ * \return                    The tag size for the specified algorithm.
+ *                            If the AEAD algorithm does not have an identified
+ *                            tag that can be distinguished from the rest of
+ *                            the ciphertext, return 0.
+ *                            If the AEAD algorithm is not recognized, return 0.
+ */
+#define PSA_AEAD_TAG_LENGTH(alg)                                        \
+    (PSA_ALG_IS_AEAD(alg) ?                                             \
+     (((alg) & PSA_ALG_AEAD_TAG_LENGTH_MASK) >> PSA_AEAD_TAG_LENGTH_OFFSET) : \
+     0)
+
+/** The maximum tag size for all supported AEAD algorithms, in bytes.
+ *
+ * See also #PSA_AEAD_TAG_LENGTH(\p alg).
+ */
+#define PSA_AEAD_TAG_MAX_SIZE       16
+
+/* The maximum size of an RSA key on this implementation, in bits.
+ * This is a vendor-specific macro.
+ *
+ * Mbed TLS does not set a hard limit on the size of RSA keys: any key
+ * whose parameters fit in a bignum is accepted. However large keys can
+ * induce a large memory usage and long computation times. Unlike other
+ * auxiliary macros in this file and in crypto.h, which reflect how the
+ * library is configured, this macro defines how the library is
+ * configured. This implementation refuses to import or generate an
+ * RSA key whose size is larger than the value defined here.
+ *
+ * Note that an implementation may set different size limits for different
+ * operations, and does not need to accept all key sizes up to the limit. */
+#define PSA_VENDOR_RSA_MAX_KEY_BITS 4096
+
+/* The maximum size of an ECC key on this implementation, in bits.
+ * This is a vendor-specific macro. */
+#if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 521
+#elif defined(MBEDTLS_ECP_DP_BP512R1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 512
+#elif defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 448
+#elif defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 384
+#elif defined(MBEDTLS_ECP_DP_BP384R1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 384
+#elif defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 256
+#elif defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 256
+#elif defined(MBEDTLS_ECP_DP_BP256R1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 256
+#elif defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 255
+#elif defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 224
+#elif defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 224
+#elif defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 192
+#elif defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 192
+#else
+#define PSA_VENDOR_ECC_MAX_CURVE_BITS 0
+#endif
+
+/** This macro returns the maximum supported length of the PSK for the
+ * TLS-1.2 PSK-to-MS key derivation
+ * (#PSA_ALG_TLS12_PSK_TO_MS(\p hash_alg)).
+ *
+ * The maximum supported length does not depend on the chosen hash algorithm.
+ *
+ * Quoting RFC 4279, Sect 5.3:
+ * TLS implementations supporting these ciphersuites MUST support
+ * arbitrary PSK identities up to 128 octets in length, and arbitrary
+ * PSKs up to 64 octets in length.  Supporting longer identities and
+ * keys is RECOMMENDED.
+ *
+ * Therefore, no implementation should define a value smaller than 64
+ * for #PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE.
+ */
+#define PSA_TLS12_PSK_TO_MS_PSK_MAX_SIZE 128
+
+/** The maximum size of a block cipher. */
+#define PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE 16
+
+/** The size of the output of psa_mac_sign_finish(), in bytes.
+ *
+ * This is also the MAC size that psa_mac_verify_finish() expects.
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param key_type      The type of the MAC key.
+ * \param key_bits      The size of the MAC key in bits.
+ * \param alg           A MAC algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_MAC(\p alg) is true).
+ *
+ * \return              The MAC size for the specified algorithm with
+ *                      the specified key parameters.
+ * \return              0 if the MAC algorithm is not recognized.
+ * \return              Either 0 or the correct size for a MAC algorithm that
+ *                      the implementation recognizes, but does not support.
+ * \return              Unspecified if the key parameters are not consistent
+ *                      with the algorithm.
+ */
+#define PSA_MAC_LENGTH(key_type, key_bits, alg)                                   \
+    ((alg) & PSA_ALG_MAC_TRUNCATION_MASK ? PSA_MAC_TRUNCATED_LENGTH(alg) :        \
+     PSA_ALG_IS_HMAC(alg) ? PSA_HASH_LENGTH(PSA_ALG_HMAC_GET_HASH(alg)) :         \
+     PSA_ALG_IS_BLOCK_CIPHER_MAC(alg) ? PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) : \
+     ((void)(key_type), (void)(key_bits), 0))
+
+/** The maximum size of the output of psa_aead_encrypt(), in bytes.
+ *
+ * If the size of the ciphertext buffer is at least this large, it is
+ * guaranteed that psa_aead_encrypt() will not fail due to an
+ * insufficient buffer size. Depending on the algorithm, the actual size of
+ * the ciphertext may be smaller.
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param alg                 An AEAD algorithm
+ *                            (\c PSA_ALG_XXX value such that
+ *                            #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param plaintext_length    Size of the plaintext in bytes.
+ *
+ * \return                    The AEAD ciphertext size for the specified
+ *                            algorithm.
+ *                            If the AEAD algorithm is not recognized, return 0.
+ */
+#define PSA_AEAD_ENCRYPT_OUTPUT_SIZE(alg, plaintext_length)       \
+    (PSA_AEAD_TAG_LENGTH(alg) != 0 ?                              \
+     (plaintext_length) + PSA_AEAD_TAG_LENGTH(alg) :              \
+     0)
+
+/** A sufficient output buffer size for psa_aead_encrypt(), for any of the
+ *  supported key types and AEAD algorithms.
+ *
+ * If the size of the ciphertext buffer is at least this large, it is guaranteed
+ * that psa_aead_encrypt() will not fail due to an insufficient buffer size.
+ *
+ * \note This macro returns a compile-time constant if its arguments are
+ *       compile-time constants.
+ *
+ * See also #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(\p alg, \p plaintext_length).
+ *
+ * \param plaintext_length    Size of the plaintext in bytes.
+ *
+ * \return                    A sufficient output buffer size for any of the
+ *                            supported key types and AEAD algorithms.
+ *
+ */
+#define PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE(plaintext_length)          \
+    ((plaintext_length) + PSA_AEAD_TAG_MAX_SIZE)
+
+
+/** The maximum size of the output of psa_aead_decrypt(), in bytes.
+ *
+ * If the size of the plaintext buffer is at least this large, it is
+ * guaranteed that psa_aead_decrypt() will not fail due to an
+ * insufficient buffer size. Depending on the algorithm, the actual size of
+ * the plaintext may be smaller.
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param alg                 An AEAD algorithm
+ *                            (\c PSA_ALG_XXX value such that
+ *                            #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param ciphertext_length   Size of the plaintext in bytes.
+ *
+ * \return                    The AEAD ciphertext size for the specified
+ *                            algorithm.
+ *                            If the AEAD algorithm is not recognized, return 0.
+ */
+#define PSA_AEAD_DECRYPT_OUTPUT_SIZE(alg, ciphertext_length)      \
+    (PSA_AEAD_TAG_LENGTH(alg) != 0 ?                              \
+     (ciphertext_length) - PSA_AEAD_TAG_LENGTH(alg) :             \
+     0)
+
+/** A sufficient output buffer size for psa_aead_decrypt(), for any of the
+ *  supported key types and AEAD algorithms.
+ *
+ * If the size of the plaintext buffer is at least this large, it is guaranteed
+ * that psa_aead_decrypt() will not fail due to an insufficient buffer size.
+ *
+ * \note This macro returns a compile-time constant if its arguments are
+ *       compile-time constants.
+ *
+ * See also #PSA_AEAD_DECRYPT_OUTPUT_SIZE(\p alg, \p ciphertext_length).
+ *
+ * \param ciphertext_length   Size of the ciphertext in bytes.
+ *
+ * \return                    A sufficient output buffer size for any of the
+ *                            supported key types and AEAD algorithms.
+ *
+ */
+#define PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE(ciphertext_length)     \
+     (ciphertext_length)
+
+/** The default nonce size for an AEAD algorithm, in bytes.
+ *
+ * This macro can be used to allocate a buffer of sufficient size to
+ * store the nonce output from #psa_aead_generate_nonce().
+ *
+ * See also #PSA_AEAD_NONCE_MAX_SIZE.
+ *
+ * \note This is not the maximum size of nonce supported as input to
+ *       #psa_aead_set_nonce(), #psa_aead_encrypt() or #psa_aead_decrypt(),
+ *       just the default size that is generated by #psa_aead_generate_nonce().
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param key_type  A symmetric key type that is compatible with
+ *                  algorithm \p alg.
+ *
+ * \param alg       An AEAD algorithm (\c PSA_ALG_XXX value such that
+ *                  #PSA_ALG_IS_AEAD(\p alg) is true).
+ *
+ * \return The default nonce size for the specified key type and algorithm.
+ *         If the key type or AEAD algorithm is not recognized,
+ *         or the parameters are incompatible, return 0.
+ */
+#define PSA_AEAD_NONCE_LENGTH(key_type, alg) \
+    (PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) == 16 && \
+         (PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_CCM || \
+          PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_GCM) ? 12 : \
+     (key_type) == PSA_KEY_TYPE_CHACHA20 && \
+          PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(alg) == PSA_ALG_CHACHA20_POLY1305 ? 12 : \
+     0)
+
+/** The maximum default nonce size among all supported pairs of key types and
+ *  AEAD algorithms, in bytes.
+ *
+ * This is equal to or greater than any value that #PSA_AEAD_NONCE_LENGTH()
+ * may return.
+ *
+ * \note This is not the maximum size of nonce supported as input to
+ *       #psa_aead_set_nonce(), #psa_aead_encrypt() or #psa_aead_decrypt(),
+ *       just the largest size that may be generated by
+ *       #psa_aead_generate_nonce().
+ */
+#define PSA_AEAD_NONCE_MAX_SIZE 12
+
+/** A sufficient output buffer size for psa_aead_update().
+ *
+ * If the size of the output buffer is at least this large, it is
+ * guaranteed that psa_aead_update() will not fail due to an
+ * insufficient buffer size. The actual size of the output may be smaller
+ * in any given call.
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param alg                 An AEAD algorithm
+ *                            (\c PSA_ALG_XXX value such that
+ *                            #PSA_ALG_IS_AEAD(\p alg) is true).
+ * \param input_length        Size of the input in bytes.
+ *
+ * \return                    A sufficient output buffer size for the specified
+ *                            algorithm.
+ *                            If the AEAD algorithm is not recognized, return 0.
+ */
+/* For all the AEAD modes defined in this specification, it is possible
+ * to emit output without delay. However, hardware may not always be
+ * capable of this. So for modes based on a block cipher, allow the
+ * implementation to delay the output until it has a full block. */
+#define PSA_AEAD_UPDATE_OUTPUT_SIZE(alg, input_length)                              \
+    (PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER(alg) ?                                         \
+     PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE, (input_length)) :    \
+     (input_length))
+
+/** A sufficient output buffer size for psa_aead_update(), for any of the
+ *  supported key types and AEAD algorithms.
+ *
+ * If the size of the output buffer is at least this large, it is guaranteed
+ * that psa_aead_update() will not fail due to an insufficient buffer size.
+ *
+ * See also #PSA_AEAD_UPDATE_OUTPUT_SIZE(\p alg, \p input_length).
+ *
+ * \param input_length      Size of the input in bytes.
+ */
+#define PSA_AEAD_UPDATE_OUTPUT_MAX_SIZE(input_length)                           \
+    (PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE, (input_length)))
+
+/** A sufficient ciphertext buffer size for psa_aead_finish().
+ *
+ * If the size of the ciphertext buffer is at least this large, it is
+ * guaranteed that psa_aead_finish() will not fail due to an
+ * insufficient ciphertext buffer size. The actual size of the output may
+ * be smaller in any given call.
+ *
+ * \param alg                 An AEAD algorithm
+ *                            (\c PSA_ALG_XXX value such that
+ *                            #PSA_ALG_IS_AEAD(\p alg) is true).
+ *
+ * \return                    A sufficient ciphertext buffer size for the
+ *                            specified algorithm.
+ *                            If the AEAD algorithm is not recognized, return 0.
+ */
+#define PSA_AEAD_FINISH_OUTPUT_SIZE(alg)                                \
+    (PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER(alg) ?                             \
+     PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE :                                  \
+     0)
+
+/** A sufficient ciphertext buffer size for psa_aead_finish(), for any of the
+ *  supported key types and AEAD algorithms.
+ *
+ * See also #PSA_AEAD_FINISH_OUTPUT_SIZE(\p alg).
+ */
+#define PSA_AEAD_FINISH_OUTPUT_MAX_SIZE     (PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE)
+
+/** A sufficient plaintext buffer size for psa_aead_verify().
+ *
+ * If the size of the plaintext buffer is at least this large, it is
+ * guaranteed that psa_aead_verify() will not fail due to an
+ * insufficient plaintext buffer size. The actual size of the output may
+ * be smaller in any given call.
+ *
+ * \param alg                 An AEAD algorithm
+ *                            (\c PSA_ALG_XXX value such that
+ *                            #PSA_ALG_IS_AEAD(\p alg) is true).
+ *
+ * \return                    A sufficient plaintext buffer size for the
+ *                            specified algorithm.
+ *                            If the AEAD algorithm is not recognized, return 0.
+ */
+#define PSA_AEAD_VERIFY_OUTPUT_SIZE(alg)                                \
+    (PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER(alg) ?                             \
+     PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE :                                  \
+     0)
+
+/** A sufficient plaintext buffer size for psa_aead_verify(), for any of the
+ *  supported key types and AEAD algorithms.
+ *
+ * See also #PSA_AEAD_VERIFY_OUTPUT_SIZE(\p alg).
+ */
+#define PSA_AEAD_VERIFY_OUTPUT_MAX_SIZE     (PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE)
+
+#define PSA_RSA_MINIMUM_PADDING_SIZE(alg)                         \
+    (PSA_ALG_IS_RSA_OAEP(alg) ?                                   \
+     2 * PSA_HASH_LENGTH(PSA_ALG_RSA_OAEP_GET_HASH(alg)) + 1 :    \
+     11 /*PKCS#1v1.5*/)
+
+/**
+ * \brief ECDSA signature size for a given curve bit size
+ *
+ * \param curve_bits    Curve size in bits.
+ * \return              Signature size in bytes.
+ *
+ * \note This macro returns a compile-time constant if its argument is one.
+ */
+#define PSA_ECDSA_SIGNATURE_SIZE(curve_bits)    \
+    (PSA_BITS_TO_BYTES(curve_bits) * 2)
+
+/** Sufficient signature buffer size for psa_sign_hash().
+ *
+ * This macro returns a sufficient buffer size for a signature using a key
+ * of the specified type and size, with the specified algorithm.
+ * Note that the actual size of the signature may be smaller
+ * (some algorithms produce a variable-size signature).
+ *
+ * \warning This function may call its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param key_type  An asymmetric key type (this may indifferently be a
+ *                  key pair type or a public key type).
+ * \param key_bits  The size of the key in bits.
+ * \param alg       The signature algorithm.
+ *
+ * \return If the parameters are valid and supported, return
+ *         a buffer size in bytes that guarantees that
+ *         psa_sign_hash() will not fail with
+ *         #PSA_ERROR_BUFFER_TOO_SMALL.
+ *         If the parameters are a valid combination that is not supported,
+ *         return either a sensible size or 0.
+ *         If the parameters are not valid, the
+ *         return value is unspecified.
+ */
+#define PSA_SIGN_OUTPUT_SIZE(key_type, key_bits, alg)        \
+    (PSA_KEY_TYPE_IS_RSA(key_type) ? ((void)alg, PSA_BITS_TO_BYTES(key_bits)) : \
+     PSA_KEY_TYPE_IS_ECC(key_type) ? PSA_ECDSA_SIGNATURE_SIZE(key_bits) : \
+     ((void)alg, 0))
+
+#define PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE     \
+    PSA_ECDSA_SIGNATURE_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS)
+
+/** \def PSA_SIGNATURE_MAX_SIZE
+ *
+ * Maximum size of an asymmetric signature.
+ *
+ * This macro expands to a compile-time constant integer. This value
+ * is the maximum size of a signature in bytes.
+ */
+#define PSA_SIGNATURE_MAX_SIZE                               \
+    (PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS) > PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE ? \
+     PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS) :                   \
+     PSA_VENDOR_ECDSA_SIGNATURE_MAX_SIZE)
+
+/** Sufficient output buffer size for psa_asymmetric_encrypt().
+ *
+ * This macro returns a sufficient buffer size for a ciphertext produced using
+ * a key of the specified type and size, with the specified algorithm.
+ * Note that the actual size of the ciphertext may be smaller, depending
+ * on the algorithm.
+ *
+ * \warning This function may call its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param key_type  An asymmetric key type (this may indifferently be a
+ *                  key pair type or a public key type).
+ * \param key_bits  The size of the key in bits.
+ * \param alg       The asymmetric encryption algorithm.
+ *
+ * \return If the parameters are valid and supported, return
+ *         a buffer size in bytes that guarantees that
+ *         psa_asymmetric_encrypt() will not fail with
+ *         #PSA_ERROR_BUFFER_TOO_SMALL.
+ *         If the parameters are a valid combination that is not supported,
+ *         return either a sensible size or 0.
+ *         If the parameters are not valid, the
+ *         return value is unspecified.
+ */
+#define PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE(key_type, key_bits, alg)     \
+    (PSA_KEY_TYPE_IS_RSA(key_type) ?                                    \
+     ((void)alg, PSA_BITS_TO_BYTES(key_bits)) :                         \
+     0)
+
+/** A sufficient output buffer size for psa_asymmetric_encrypt(), for any
+ *  supported asymmetric encryption.
+ *
+ * See also #PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE(\p key_type, \p key_bits, \p alg).
+ */
+/* This macro assumes that RSA is the only supported asymmetric encryption. */
+#define PSA_ASYMMETRIC_ENCRYPT_OUTPUT_MAX_SIZE          \
+    (PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS))
+
+/** Sufficient output buffer size for psa_asymmetric_decrypt().
+ *
+ * This macro returns a sufficient buffer size for a plaintext produced using
+ * a key of the specified type and size, with the specified algorithm.
+ * Note that the actual size of the plaintext may be smaller, depending
+ * on the algorithm.
+ *
+ * \warning This function may call its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param key_type  An asymmetric key type (this may indifferently be a
+ *                  key pair type or a public key type).
+ * \param key_bits  The size of the key in bits.
+ * \param alg       The asymmetric encryption algorithm.
+ *
+ * \return If the parameters are valid and supported, return
+ *         a buffer size in bytes that guarantees that
+ *         psa_asymmetric_decrypt() will not fail with
+ *         #PSA_ERROR_BUFFER_TOO_SMALL.
+ *         If the parameters are a valid combination that is not supported,
+ *         return either a sensible size or 0.
+ *         If the parameters are not valid, the
+ *         return value is unspecified.
+ */
+#define PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(key_type, key_bits, alg)     \
+    (PSA_KEY_TYPE_IS_RSA(key_type) ?                                    \
+     PSA_BITS_TO_BYTES(key_bits) - PSA_RSA_MINIMUM_PADDING_SIZE(alg) :  \
+     0)
+
+/** A sufficient output buffer size for psa_asymmetric_decrypt(), for any
+ *  supported asymmetric decryption.
+ *
+ * This macro assumes that RSA is the only supported asymmetric encryption.
+ *
+ * See also #PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(\p key_type, \p key_bits, \p alg).
+ */
+#define PSA_ASYMMETRIC_DECRYPT_OUTPUT_MAX_SIZE          \
+    (PSA_BITS_TO_BYTES(PSA_VENDOR_RSA_MAX_KEY_BITS))
+
+/* Maximum size of the ASN.1 encoding of an INTEGER with the specified
+ * number of bits.
+ *
+ * This definition assumes that bits <= 2^19 - 9 so that the length field
+ * is at most 3 bytes. The length of the encoding is the length of the
+ * bit string padded to a whole number of bytes plus:
+ * - 1 type byte;
+ * - 1 to 3 length bytes;
+ * - 0 to 1 bytes of leading 0 due to the sign bit.
+ */
+#define PSA_KEY_EXPORT_ASN1_INTEGER_MAX_SIZE(bits)      \
+    ((bits) / 8 + 5)
+
+/* Maximum size of the export encoding of an RSA public key.
+ * Assumes that the public exponent is less than 2^32.
+ *
+ * RSAPublicKey  ::=  SEQUENCE  {
+ *    modulus            INTEGER,    -- n
+ *    publicExponent     INTEGER  }  -- e
+ *
+ * - 4 bytes of SEQUENCE overhead;
+ * - n : INTEGER;
+ * - 7 bytes for the public exponent.
+ */
+#define PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(key_bits)        \
+    (PSA_KEY_EXPORT_ASN1_INTEGER_MAX_SIZE(key_bits) + 11)
+
+/* Maximum size of the export encoding of an RSA key pair.
+ * Assumes thatthe public exponent is less than 2^32 and that the size
+ * difference between the two primes is at most 1 bit.
+ *
+ * RSAPrivateKey ::= SEQUENCE {
+ *     version           Version,  -- 0
+ *     modulus           INTEGER,  -- N-bit
+ *     publicExponent    INTEGER,  -- 32-bit
+ *     privateExponent   INTEGER,  -- N-bit
+ *     prime1            INTEGER,  -- N/2-bit
+ *     prime2            INTEGER,  -- N/2-bit
+ *     exponent1         INTEGER,  -- N/2-bit
+ *     exponent2         INTEGER,  -- N/2-bit
+ *     coefficient       INTEGER,  -- N/2-bit
+ * }
+ *
+ * - 4 bytes of SEQUENCE overhead;
+ * - 3 bytes of version;
+ * - 7 half-size INTEGERs plus 2 full-size INTEGERs,
+ *   overapproximated as 9 half-size INTEGERS;
+ * - 7 bytes for the public exponent.
+ */
+#define PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(key_bits)   \
+    (9 * PSA_KEY_EXPORT_ASN1_INTEGER_MAX_SIZE((key_bits) / 2 + 1) + 14)
+
+/* Maximum size of the export encoding of a DSA public key.
+ *
+ * SubjectPublicKeyInfo  ::=  SEQUENCE  {
+ *      algorithm            AlgorithmIdentifier,
+ *      subjectPublicKey     BIT STRING  } -- contains DSAPublicKey
+ * AlgorithmIdentifier  ::=  SEQUENCE  {
+ *      algorithm               OBJECT IDENTIFIER,
+ *      parameters              Dss-Parms  } -- SEQUENCE of 3 INTEGERs
+ * DSAPublicKey  ::=  INTEGER -- public key, Y
+ *
+ * - 3 * 4 bytes of SEQUENCE overhead;
+ * - 1 + 1 + 7 bytes of algorithm (DSA OID);
+ * - 4 bytes of BIT STRING overhead;
+ * - 3 full-size INTEGERs (p, g, y);
+ * - 1 + 1 + 32 bytes for 1 sub-size INTEGER (q <= 256 bits).
+ */
+#define PSA_KEY_EXPORT_DSA_PUBLIC_KEY_MAX_SIZE(key_bits)        \
+    (PSA_KEY_EXPORT_ASN1_INTEGER_MAX_SIZE(key_bits) * 3 + 59)
+
+/* Maximum size of the export encoding of a DSA key pair.
+ *
+ * DSAPrivateKey ::= SEQUENCE {
+ *     version             Version,  -- 0
+ *     prime               INTEGER,  -- p
+ *     subprime            INTEGER,  -- q
+ *     generator           INTEGER,  -- g
+ *     public              INTEGER,  -- y
+ *     private             INTEGER,  -- x
+ * }
+ *
+ * - 4 bytes of SEQUENCE overhead;
+ * - 3 bytes of version;
+ * - 3 full-size INTEGERs (p, g, y);
+ * - 2 * (1 + 1 + 32) bytes for 2 sub-size INTEGERs (q, x <= 256 bits).
+ */
+#define PSA_KEY_EXPORT_DSA_KEY_PAIR_MAX_SIZE(key_bits)   \
+    (PSA_KEY_EXPORT_ASN1_INTEGER_MAX_SIZE(key_bits) * 3 + 75)
+
+/* Maximum size of the export encoding of an ECC public key.
+ *
+ * The representation of an ECC public key is:
+ *      - The byte 0x04;
+ *      - `x_P` as a `ceiling(m/8)`-byte string, big-endian;
+ *      - `y_P` as a `ceiling(m/8)`-byte string, big-endian;
+ *      - where m is the bit size associated with the curve.
+ *
+ * - 1 byte + 2 * point size.
+ */
+#define PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(key_bits)        \
+    (2 * PSA_BITS_TO_BYTES(key_bits) + 1)
+
+/* Maximum size of the export encoding of an ECC key pair.
+ *
+ * An ECC key pair is represented by the secret value.
+ */
+#define PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(key_bits)   \
+    (PSA_BITS_TO_BYTES(key_bits))
+
+/** Sufficient output buffer size for psa_export_key() or
+ * psa_export_public_key().
+ *
+ * This macro returns a compile-time constant if its arguments are
+ * compile-time constants.
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * The following code illustrates how to allocate enough memory to export
+ * a key by querying the key type and size at runtime.
+ * \code{c}
+ * psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
+ * psa_status_t status;
+ * status = psa_get_key_attributes(key, &attributes);
+ * if (status != PSA_SUCCESS) handle_error(...);
+ * psa_key_type_t key_type = psa_get_key_type(&attributes);
+ * size_t key_bits = psa_get_key_bits(&attributes);
+ * size_t buffer_size = PSA_EXPORT_KEY_OUTPUT_SIZE(key_type, key_bits);
+ * psa_reset_key_attributes(&attributes);
+ * uint8_t *buffer = malloc(buffer_size);
+ * if (buffer == NULL) handle_error(...);
+ * size_t buffer_length;
+ * status = psa_export_key(key, buffer, buffer_size, &buffer_length);
+ * if (status != PSA_SUCCESS) handle_error(...);
+ * \endcode
+ *
+ * \param key_type  A supported key type.
+ * \param key_bits  The size of the key in bits.
+ *
+ * \return If the parameters are valid and supported, return
+ *         a buffer size in bytes that guarantees that
+ *         psa_export_key() or psa_export_public_key() will not fail with
+ *         #PSA_ERROR_BUFFER_TOO_SMALL.
+ *         If the parameters are a valid combination that is not supported,
+ *         return either a sensible size or 0.
+ *         If the parameters are not valid, the return value is unspecified.
+ */
+#define PSA_EXPORT_KEY_OUTPUT_SIZE(key_type, key_bits)                                              \
+    (PSA_KEY_TYPE_IS_UNSTRUCTURED(key_type) ? PSA_BITS_TO_BYTES(key_bits) :                         \
+     (key_type) == PSA_KEY_TYPE_RSA_KEY_PAIR ? PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(key_bits) :     \
+     (key_type) == PSA_KEY_TYPE_RSA_PUBLIC_KEY ? PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(key_bits) : \
+     (key_type) == PSA_KEY_TYPE_DSA_KEY_PAIR ? PSA_KEY_EXPORT_DSA_KEY_PAIR_MAX_SIZE(key_bits) :     \
+     (key_type) == PSA_KEY_TYPE_DSA_PUBLIC_KEY ? PSA_KEY_EXPORT_DSA_PUBLIC_KEY_MAX_SIZE(key_bits) : \
+     PSA_KEY_TYPE_IS_ECC_KEY_PAIR(key_type) ? PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(key_bits) :      \
+     PSA_KEY_TYPE_IS_ECC_PUBLIC_KEY(key_type) ? PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(key_bits) :  \
+     0)
+
+/** Sufficient output buffer size for psa_export_public_key().
+ *
+ * This macro returns a compile-time constant if its arguments are
+ * compile-time constants.
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * The following code illustrates how to allocate enough memory to export
+ * a public key by querying the key type and size at runtime.
+ * \code{c}
+ * psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
+ * psa_status_t status;
+ * status = psa_get_key_attributes(key, &attributes);
+ * if (status != PSA_SUCCESS) handle_error(...);
+ * psa_key_type_t key_type = psa_get_key_type(&attributes);
+ * size_t key_bits = psa_get_key_bits(&attributes);
+ * size_t buffer_size = PSA_EXPORT_PUBLIC_KEY_OUTPUT_SIZE(key_type, key_bits);
+ * psa_reset_key_attributes(&attributes);
+ * uint8_t *buffer = malloc(buffer_size);
+ * if (buffer == NULL) handle_error(...);
+ * size_t buffer_length;
+ * status = psa_export_public_key(key, buffer, buffer_size, &buffer_length);
+ * if (status != PSA_SUCCESS) handle_error(...);
+ * \endcode
+ *
+ * \param key_type      A public key or key pair key type.
+ * \param key_bits      The size of the key in bits.
+ *
+ * \return              If the parameters are valid and supported, return
+ *                      a buffer size in bytes that guarantees that
+ *                      psa_export_public_key() will not fail with
+ *                      #PSA_ERROR_BUFFER_TOO_SMALL.
+ *                      If the parameters are a valid combination that is not
+ *                      supported, return either a sensible size or 0.
+ *                      If the parameters are not valid,
+ *                      the return value is unspecified.
+ *
+ *                      If the parameters are valid and supported,
+ *                      return the same result as
+ *                      #PSA_EXPORT_KEY_OUTPUT_SIZE(
+ *                          \p #PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(\p key_type),
+ *                          \p key_bits).
+ */
+#define PSA_EXPORT_PUBLIC_KEY_OUTPUT_SIZE(key_type, key_bits)                           \
+    (PSA_KEY_TYPE_IS_RSA(key_type) ? PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(key_bits) : \
+     PSA_KEY_TYPE_IS_ECC(key_type) ? PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(key_bits) : \
+     0)
+
+/** Sufficient buffer size for exporting any asymmetric key pair.
+ *
+ * This macro expands to a compile-time constant integer. This value is
+ * a sufficient buffer size when calling psa_export_key() to export any
+ * asymmetric key pair, regardless of the exact key type and key size.
+ *
+ * See also #PSA_EXPORT_KEY_OUTPUT_SIZE(\p key_type, \p key_bits).
+ */
+#define PSA_EXPORT_KEY_PAIR_MAX_SIZE                                            \
+    (PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS) >        \
+     PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS) ?      \
+     PSA_KEY_EXPORT_RSA_KEY_PAIR_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS) :        \
+     PSA_KEY_EXPORT_ECC_KEY_PAIR_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS))
+
+/** Sufficient buffer size for exporting any asymmetric public key.
+ *
+ * This macro expands to a compile-time constant integer. This value is
+ * a sufficient buffer size when calling psa_export_key() or
+ * psa_export_public_key() to export any asymmetric public key,
+ * regardless of the exact key type and key size.
+ *
+ * See also #PSA_EXPORT_PUBLIC_KEY_OUTPUT_SIZE(\p key_type, \p key_bits).
+ */
+#define PSA_EXPORT_PUBLIC_KEY_MAX_SIZE                                          \
+    (PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS) >      \
+     PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS) ?    \
+     PSA_KEY_EXPORT_RSA_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_RSA_MAX_KEY_BITS) :      \
+     PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE(PSA_VENDOR_ECC_MAX_CURVE_BITS))
+
+/** Sufficient output buffer size for psa_raw_key_agreement().
+ *
+ * This macro returns a compile-time constant if its arguments are
+ * compile-time constants.
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * See also #PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE.
+ *
+ * \param key_type      A supported key type.
+ * \param key_bits      The size of the key in bits.
+ *
+ * \return              If the parameters are valid and supported, return
+ *                      a buffer size in bytes that guarantees that
+ *                      psa_raw_key_agreement() will not fail with
+ *                      #PSA_ERROR_BUFFER_TOO_SMALL.
+ *                      If the parameters are a valid combination that
+ *                      is not supported, return either a sensible size or 0.
+ *                      If the parameters are not valid,
+ *                      the return value is unspecified.
+ */
+/* FFDH is not yet supported in PSA. */
+#define PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(key_type, key_bits)   \
+    (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(key_type) ?                   \
+     PSA_BITS_TO_BYTES(key_bits) :                              \
+     0)
+
+/** Maximum size of the output from psa_raw_key_agreement().
+ *
+ * This macro expands to a compile-time constant integer. This value is the
+ * maximum size of the output any raw key agreement algorithm, in bytes.
+ *
+ * See also #PSA_RAW_KEY_AGREEMENT_OUTPUT_SIZE(\p key_type, \p key_bits).
+ */
+#define PSA_RAW_KEY_AGREEMENT_OUTPUT_MAX_SIZE   \
+    (PSA_BITS_TO_BYTES(PSA_VENDOR_ECC_MAX_CURVE_BITS))
+
+/** The default IV size for a cipher algorithm, in bytes.
+ *
+ * The IV that is generated as part of a call to #psa_cipher_encrypt() is always
+ * the default IV length for the algorithm.
+ *
+ * This macro can be used to allocate a buffer of sufficient size to
+ * store the IV output from #psa_cipher_generate_iv() when using
+ * a multi-part cipher operation.
+ *
+ * See also #PSA_CIPHER_IV_MAX_SIZE.
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param key_type  A symmetric key type that is compatible with algorithm \p alg.
+ *
+ * \param alg       A cipher algorithm (\c PSA_ALG_XXX value such that #PSA_ALG_IS_CIPHER(\p alg) is true).
+ *
+ * \return The default IV size for the specified key type and algorithm.
+ *         If the algorithm does not use an IV, return 0.
+ *         If the key type or cipher algorithm is not recognized,
+ *         or the parameters are incompatible, return 0.
+ */
+#define PSA_CIPHER_IV_LENGTH(key_type, alg) \
+    (PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) > 1 && \
+        ((alg) == PSA_ALG_CTR || \
+         (alg) == PSA_ALG_CFB || \
+         (alg) == PSA_ALG_OFB || \
+         (alg) == PSA_ALG_XTS || \
+         (alg) == PSA_ALG_CBC_NO_PADDING || \
+         (alg) == PSA_ALG_CBC_PKCS7) ? PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) : \
+     (key_type) == PSA_KEY_TYPE_CHACHA20 && \
+         (alg) == PSA_ALG_STREAM_CIPHER ? 12 : \
+     0)
+
+/** The maximum IV size for all supported cipher algorithms, in bytes.
+ *
+ * See also #PSA_CIPHER_IV_LENGTH().
+ */
+#define PSA_CIPHER_IV_MAX_SIZE 16
+
+/** The maximum size of the output of psa_cipher_encrypt(), in bytes.
+ *
+ * If the size of the output buffer is at least this large, it is guaranteed
+ * that psa_cipher_encrypt() will not fail due to an insufficient buffer size.
+ * Depending on the algorithm, the actual size of the output might be smaller.
+ *
+ * See also #PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE(\p input_length).
+ *
+ * \warning This macro may evaluate its arguments multiple times or
+ *          zero times, so you should not pass arguments that contain
+ *          side effects.
+ *
+ * \param key_type      A symmetric key type that is compatible with algorithm
+ *                      alg.
+ * \param alg           A cipher algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_CIPHER(\p alg) is true).
+ * \param input_length  Size of the input in bytes.
+ *
+ * \return              A sufficient output size for the specified key type and
+ *                      algorithm. If the key type or cipher algorithm is not
+ *                      recognized, or the parameters are incompatible,
+ *                      return 0.
+ */
+#define PSA_CIPHER_ENCRYPT_OUTPUT_SIZE(key_type, alg, input_length)             \
+    (alg == PSA_ALG_CBC_PKCS7 ?                                                 \
+     PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type),          \
+                              (input_length) + 1) +                             \
+     PSA_CIPHER_IV_LENGTH((key_type), (alg)) :                                  \
+     (PSA_ALG_IS_CIPHER(alg) ?                                                  \
+      (input_length) + PSA_CIPHER_IV_LENGTH((key_type), (alg)) :                \
+     0))
+
+/** A sufficient output buffer size for psa_cipher_encrypt(), for any of the
+ *  supported key types and cipher algorithms.
+ *
+ * If the size of the output buffer is at least this large, it is guaranteed
+ * that psa_cipher_encrypt() will not fail due to an insufficient buffer size.
+ *
+ * See also #PSA_CIPHER_ENCRYPT_OUTPUT_SIZE(\p key_type, \p alg, \p input_length).
+ *
+ * \param input_length  Size of the input in bytes.
+ *
+ */
+#define PSA_CIPHER_ENCRYPT_OUTPUT_MAX_SIZE(input_length)                        \
+    (PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE,                  \
+                              (input_length) + 1) +                             \
+     PSA_CIPHER_IV_MAX_SIZE)
+
+/** The maximum size of the output of psa_cipher_decrypt(), in bytes.
+ *
+ * If the size of the output buffer is at least this large, it is guaranteed
+ * that psa_cipher_decrypt() will not fail due to an insufficient buffer size.
+ * Depending on the algorithm, the actual size of the output might be smaller.
+ *
+ * See also #PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE(\p input_length).
+ *
+ * \param key_type      A symmetric key type that is compatible with algorithm
+ *                      alg.
+ * \param alg           A cipher algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_CIPHER(\p alg) is true).
+ * \param input_length  Size of the input in bytes.
+ *
+ * \return              A sufficient output size for the specified key type and
+ *                      algorithm. If the key type or cipher algorithm is not
+ *                      recognized, or the parameters are incompatible,
+ *                      return 0.
+ */
+#define PSA_CIPHER_DECRYPT_OUTPUT_SIZE(key_type, alg, input_length)                 \
+    (PSA_ALG_IS_CIPHER(alg) &&                                                      \
+     ((key_type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_SYMMETRIC ? \
+     (input_length) :                                                               \
+     0)
+
+/** A sufficient output buffer size for psa_cipher_decrypt(), for any of the
+ *  supported key types and cipher algorithms.
+ *
+ * If the size of the output buffer is at least this large, it is guaranteed
+ * that psa_cipher_decrypt() will not fail due to an insufficient buffer size.
+ *
+ * See also #PSA_CIPHER_DECRYPT_OUTPUT_SIZE(\p key_type, \p alg, \p input_length).
+ *
+ * \param input_length  Size of the input in bytes.
+ */
+#define PSA_CIPHER_DECRYPT_OUTPUT_MAX_SIZE(input_length)    \
+    (input_length)
+
+/** A sufficient output buffer size for psa_cipher_update().
+ *
+ * If the size of the output buffer is at least this large, it is guaranteed
+ * that psa_cipher_update() will not fail due to an insufficient buffer size.
+ * The actual size of the output might be smaller in any given call.
+ *
+ * See also #PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE(\p input_length).
+ *
+ * \param key_type      A symmetric key type that is compatible with algorithm
+ *                      alg.
+ * \param alg           A cipher algorithm (PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_CIPHER(\p alg) is true).
+ * \param input_length  Size of the input in bytes.
+ *
+ * \return              A sufficient output size for the specified key type and
+ *                      algorithm. If the key type or cipher algorithm is not
+ *                      recognized, or the parameters are incompatible, return 0.
+ */
+#define PSA_CIPHER_UPDATE_OUTPUT_SIZE(key_type, alg, input_length)              \
+    (PSA_ALG_IS_CIPHER(alg) ?                                                   \
+     (((alg) == PSA_ALG_CBC_PKCS7      ||                                       \
+       (alg) == PSA_ALG_CBC_NO_PADDING ||                                       \
+       (alg) == PSA_ALG_ECB_NO_PADDING) ?                                       \
+      PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type),         \
+                                input_length) :                                 \
+      (input_length)) :                                                         \
+     0)
+
+/** A sufficient output buffer size for psa_cipher_update(), for any of the
+ *  supported key types and cipher algorithms.
+ *
+ * If the size of the output buffer is at least this large, it is guaranteed
+ * that psa_cipher_update() will not fail due to an insufficient buffer size.
+ *
+ * See also #PSA_CIPHER_UPDATE_OUTPUT_SIZE(\p key_type, \p alg, \p input_length).
+ *
+ * \param input_length  Size of the input in bytes.
+ */
+#define PSA_CIPHER_UPDATE_OUTPUT_MAX_SIZE(input_length)     \
+    (PSA_ROUND_UP_TO_MULTIPLE(PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE, input_length))
+
+/** A sufficient ciphertext buffer size for psa_cipher_finish().
+ *
+ * If the size of the ciphertext buffer is at least this large, it is
+ * guaranteed that psa_cipher_finish() will not fail due to an insufficient
+ * ciphertext buffer size. The actual size of the output might be smaller in
+ * any given call.
+ *
+ * See also #PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE().
+ *
+ * \param key_type      A symmetric key type that is compatible with algorithm
+ *                      alg.
+ * \param alg           A cipher algorithm (PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_CIPHER(\p alg) is true).
+ * \return              A sufficient output size for the specified key type and
+ *                      algorithm. If the key type or cipher algorithm is not
+ *                      recognized, or the parameters are incompatible, return 0.
+ */
+#define PSA_CIPHER_FINISH_OUTPUT_SIZE(key_type, alg)    \
+    (PSA_ALG_IS_CIPHER(alg) ?                           \
+     (alg == PSA_ALG_CBC_PKCS7 ?                        \
+      PSA_BLOCK_CIPHER_BLOCK_LENGTH(key_type) :         \
+      0) :                                              \
+     0)
+
+/** A sufficient ciphertext buffer size for psa_cipher_finish(), for any of the
+ *  supported key types and cipher algorithms.
+ *
+ * See also #PSA_CIPHER_FINISH_OUTPUT_SIZE(\p key_type, \p alg).
+ */
+#define PSA_CIPHER_FINISH_OUTPUT_MAX_SIZE           \
+    (PSA_BLOCK_CIPHER_BLOCK_MAX_SIZE)
+
+#endif /* PSA_CRYPTO_SIZES_H */
diff --git a/components/service/crypto/include/psa/crypto_struct.h b/components/service/crypto/include/psa/crypto_struct.h
new file mode 100644
index 0000000..1bc55e3
--- /dev/null
+++ b/components/service/crypto/include/psa/crypto_struct.h
@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2018-2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+/**
+ * \file psa/crypto_struct.h
+ *
+ * \brief PSA cryptography module: structured type implementations
+ *
+ * \note This file may not be included directly. Applications must
+ * include psa/crypto.h.
+ *
+ * This file contains the definitions of some data structures with
+ * implementation-specific definitions.
+ *
+ * In implementations with isolation between the application and the
+ * cryptography module, it is expected that the front-end and the back-end
+ * would have different versions of this file.
+ */
+
+#ifndef PSA_CRYPTO_STRUCT_H
+#define PSA_CRYPTO_STRUCT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * Note that the below structures are different from the decalrations in
+ * mbed-crypto. This is because TF-M maintains 'front-end' and 'back-end'
+ * versions of this header. In the front-end version, exported to NS
+ * clients in interface/include/psa, a crypto operation is defined as an
+ * opaque handle to a context in the Crypto service. The back-end
+ * version, directly included from the mbed-crypto repo by the Crypto
+ * service, contains the full definition of the operation structs.
+ *
+ * One of the functions of the Crypto service is to allocate the back-end
+ * operation contexts in its own partition memory (in crypto_alloc.c),
+ * and then do the mapping between front-end operation handles passed by
+ * NS clients and the corresponding back-end operation contexts. The
+ * advantage of doing it this way is that internal mbed-crypto state is never
+ * exposed to the NS client.
+ */
+
+struct psa_hash_operation_s
+{
+    uint32_t handle;
+};
+
+#define PSA_HASH_OPERATION_INIT {0}
+static inline struct psa_hash_operation_s psa_hash_operation_init( void )
+{
+    const struct psa_hash_operation_s v = PSA_HASH_OPERATION_INIT;
+    return( v );
+}
+
+struct psa_mac_operation_s
+{
+    uint32_t handle;
+};
+
+#define PSA_MAC_OPERATION_INIT {0}
+static inline struct psa_mac_operation_s psa_mac_operation_init( void )
+{
+    const struct psa_mac_operation_s v = PSA_MAC_OPERATION_INIT;
+    return( v );
+}
+
+struct psa_cipher_operation_s
+{
+    uint32_t handle;
+};
+
+#define PSA_CIPHER_OPERATION_INIT {0}
+static inline struct psa_cipher_operation_s psa_cipher_operation_init( void )
+{
+    const struct psa_cipher_operation_s v = PSA_CIPHER_OPERATION_INIT;
+    return( v );
+}
+
+struct psa_aead_operation_s
+{
+    uint32_t handle;
+};
+
+#define PSA_AEAD_OPERATION_INIT {0}
+static inline struct psa_aead_operation_s psa_aead_operation_init( void )
+{
+    const struct psa_aead_operation_s v = PSA_AEAD_OPERATION_INIT;
+    return( v );
+}
+
+struct psa_key_derivation_s
+{
+    uint32_t handle;
+};
+
+#define PSA_KEY_DERIVATION_OPERATION_INIT {0}
+static inline struct psa_key_derivation_s psa_key_derivation_operation_init( void )
+{
+    const struct psa_key_derivation_s v = PSA_KEY_DERIVATION_OPERATION_INIT;
+    return( v );
+}
+
+/* The type used internally for key sizes.
+ * Public interfaces use size_t, but internally we use a smaller type. */
+typedef uint16_t psa_key_bits_t;
+/* The maximum value of the type used to represent bit-sizes.
+ * This is used to mark an invalid key size. */
+#define PSA_KEY_BITS_TOO_LARGE ( (psa_key_bits_t) ( -1 ) )
+/* The maximum size of a key in bits.
+ * Currently defined as the maximum that can be represented, rounded down
+ * to a whole number of bytes.
+ * This is an uncast value so that it can be used in preprocessor
+ * conditionals. */
+#define PSA_MAX_KEY_BITS 0xfff8
+
+#define PSA_KEY_ATTRIBUTES_INIT PSA_CLIENT_KEY_ATTRIBUTES_INIT
+
+static inline struct psa_client_key_attributes_s psa_key_attributes_init( void )
+{
+    const struct psa_client_key_attributes_s v = PSA_KEY_ATTRIBUTES_INIT;
+    return( v );
+}
+
+static inline void psa_set_key_id(psa_key_attributes_t *attributes,
+                                  psa_key_id_t id)
+{
+    attributes->id = id;
+    if( attributes->lifetime == PSA_KEY_LIFETIME_VOLATILE )
+        attributes->lifetime = PSA_KEY_LIFETIME_PERSISTENT;
+}
+
+static inline psa_key_id_t psa_get_key_id(
+    const psa_key_attributes_t *attributes)
+{
+    return( attributes->id );
+}
+
+static inline void psa_set_key_lifetime(psa_key_attributes_t *attributes,
+                                        psa_key_lifetime_t lifetime)
+{
+    attributes->lifetime = lifetime;
+    if( lifetime == PSA_KEY_LIFETIME_VOLATILE )
+    {
+        attributes->id = 0;
+    }
+}
+
+static inline psa_key_lifetime_t psa_get_key_lifetime(
+    const psa_key_attributes_t *attributes)
+{
+    return( attributes->lifetime );
+}
+
+static inline void psa_set_key_usage_flags(psa_key_attributes_t *attributes,
+                                           psa_key_usage_t usage_flags)
+{
+    attributes->usage = usage_flags;
+}
+
+static inline psa_key_usage_t psa_get_key_usage_flags(
+    const psa_key_attributes_t *attributes)
+{
+    return( attributes->usage );
+}
+
+static inline void psa_set_key_algorithm(psa_key_attributes_t *attributes,
+                                         psa_algorithm_t alg)
+{
+    attributes->alg = alg;
+}
+
+static inline psa_algorithm_t psa_get_key_algorithm(
+    const psa_key_attributes_t *attributes)
+{
+    return( attributes->alg );
+}
+
+static inline void psa_set_key_type(psa_key_attributes_t *attributes,
+                                    psa_key_type_t type)
+{
+    attributes->type = type;
+}
+
+static inline psa_key_type_t psa_get_key_type(
+    const psa_key_attributes_t *attributes)
+{
+    return( attributes->type );
+}
+
+static inline void psa_set_key_bits(psa_key_attributes_t *attributes,
+                                    size_t bits)
+{
+    if( bits > PSA_MAX_KEY_BITS )
+        attributes->bits = PSA_KEY_BITS_TOO_LARGE;
+    else
+        attributes->bits = bits;
+}
+
+static inline size_t psa_get_key_bits(
+    const psa_key_attributes_t *attributes)
+{
+    return( attributes->bits );
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PSA_CRYPTO_STRUCT_H */
diff --git a/components/service/crypto/include/psa/crypto_types.h b/components/service/crypto/include/psa/crypto_types.h
new file mode 100644
index 0000000..ed20916
--- /dev/null
+++ b/components/service/crypto/include/psa/crypto_types.h
@@ -0,0 +1,360 @@
+/*
+ * Copyright (c) 2018-2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+/**
+ * \file psa/crypto_types.h
+ *
+ * \brief PSA cryptography module: type aliases.
+ *
+ * \note This file may not be included directly. Applications must
+ * include psa/crypto.h. Drivers must include the appropriate driver
+ * header file.
+ *
+ * This file contains portable definitions of integral types for properties
+ * of cryptographic keys, designations of cryptographic algorithms, and
+ * error codes returned by the library.
+ *
+ * This header file does not declare any function.
+ */
+
+#ifndef PSA_CRYPTO_TYPES_H
+#define PSA_CRYPTO_TYPES_H
+
+#include <stdint.h>
+
+/** \defgroup error Error codes
+ * @{
+ */
+
+/**
+ * \brief Function return status.
+ *
+ * This is either #PSA_SUCCESS (which is zero), indicating success,
+ * or a small negative value indicating that an error occurred. Errors are
+ * encoded as one of the \c PSA_ERROR_xxx values defined here. */
+/* If #PSA_SUCCESS is already defined, it means that #psa_status_t
+ * is also defined in an external header, so prevent its multiple
+ * definition.
+ */
+#ifndef PSA_SUCCESS
+typedef int32_t psa_status_t;
+#endif
+
+/**@}*/
+
+/** \defgroup crypto_types Key and algorithm types
+ * @{
+ */
+
+/* Integral type representing a key handle. */
+typedef uint16_t psa_key_handle_t;
+
+
+/** \brief Encoding of a key type.
+ */
+typedef uint16_t psa_key_type_t;
+
+/** The type of PSA elliptic curve family identifiers.
+ *
+ * The curve identifier is required to create an ECC key using the
+ * PSA_KEY_TYPE_ECC_KEY_PAIR() or PSA_KEY_TYPE_ECC_PUBLIC_KEY()
+ * macros.
+ *
+ * Values defined by this standard will never be in the range 0x80-0xff.
+ * Vendors who define additional families must use an encoding in this range.
+ */
+typedef uint8_t psa_ecc_family_t;
+
+/** The type of PSA Diffie-Hellman group family identifiers.
+ *
+ * The group identifier is required to create an Diffie-Hellman key using the
+ * PSA_KEY_TYPE_DH_KEY_PAIR() or PSA_KEY_TYPE_DH_PUBLIC_KEY()
+ * macros.
+ *
+ * Values defined by this standard will never be in the range 0x80-0xff.
+ * Vendors who define additional families must use an encoding in this range.
+ */
+typedef uint8_t psa_dh_family_t;
+
+/** \brief Encoding of a cryptographic algorithm.
+ *
+ * For algorithms that can be applied to multiple key types, this type
+ * does not encode the key type. For example, for symmetric ciphers
+ * based on a block cipher, #psa_algorithm_t encodes the block cipher
+ * mode and the padding mode while the block cipher itself is encoded
+ * via #psa_key_type_t.
+ */
+typedef uint32_t psa_algorithm_t;
+
+/**@}*/
+
+/** \defgroup key_lifetimes Key lifetimes
+ * @{
+ */
+
+/** Encoding of key lifetimes.
+ *
+ * The lifetime of a key indicates where it is stored and what system actions
+ * may create and destroy it.
+ *
+ * Lifetime values have the following structure:
+ * - Bits 0-7 (#PSA_KEY_LIFETIME_GET_PERSISTENCE(\c lifetime)):
+ *   persistence level. This value indicates what device management
+ *   actions can cause it to be destroyed. In particular, it indicates
+ *   whether the key is _volatile_ or _persistent_.
+ *   See ::psa_key_persistence_t for more information.
+ * - Bits 8-31 (#PSA_KEY_LIFETIME_GET_LOCATION(\c lifetime)):
+ *   location indicator. This value indicates where the key is stored
+ *   and where operations on the key are performed.
+ *   See ::psa_key_location_t for more information.
+ *
+ * Volatile keys are automatically destroyed when the application instance
+ * terminates or on a power reset of the device. Persistent keys are
+ * preserved until the application explicitly destroys them or until an
+ * implementation-specific device management event occurs (for example,
+ * a factory reset).
+ *
+ * Persistent keys have a key identifier of type #psa_key_id_t.
+ * This identifier remains valid throughout the lifetime of the key,
+ * even if the application instance that created the key terminates.
+ * The application can call psa_open_key() to open a persistent key that
+ * it created previously.
+ *
+ * This specification defines two basic lifetime values:
+ * - Keys with the lifetime #PSA_KEY_LIFETIME_VOLATILE are volatile.
+ *   All implementations should support this lifetime.
+ * - Keys with the lifetime #PSA_KEY_LIFETIME_PERSISTENT are persistent.
+ *   All implementations that have access to persistent storage with
+ *   appropriate security guarantees should support this lifetime.
+ */
+typedef uint32_t psa_key_lifetime_t;
+
+/** Encoding of key persistence levels.
+ *
+ * What distinguishes different persistence levels is what device management
+ * events may cause keys to be destroyed. _Volatile_ keys are destroyed
+ * by a power reset. Persistent keys may be destroyed by events such as
+ * a transfer of ownership or a factory reset. What management events
+ * actually affect persistent keys at different levels is outside the
+ * scope of the PSA Cryptography specification.
+ *
+ * This specification defines the following values of persistence levels:
+ * - \c 0 = #PSA_KEY_PERSISTENCE_VOLATILE: volatile key.
+ *   A volatile key is automatically destroyed by the implementation when
+ *   the application instance terminates. In particular, a volatile key
+ *   is automatically destroyed on a power reset of the device.
+ * - \c 1 = #PSA_KEY_PERSISTENCE_DEFAULT:
+ *   persistent key with a default lifetime.
+ *   Implementations should support this value if they support persistent
+ *   keys at all.
+ *   Applications should use this value if they have no specific needs that
+ *   are only met by implementation-specific features.
+ * - \c 2-127: persistent key with a PSA-specified lifetime.
+ *   The PSA Cryptography specification does not define the meaning of these
+ *   values, but other PSA specifications may do so.
+ * - \c 128-254: persistent key with a vendor-specified lifetime.
+ *   No PSA specification will define the meaning of these values, so
+ *   implementations may choose the meaning freely.
+ *   As a guideline, higher persistence levels should cause a key to survive
+ *   more management events than lower levels.
+ * - \c 255 = #PSA_KEY_PERSISTENCE_READ_ONLY:
+ *   read-only or write-once key.
+ *   A key with this persistence level cannot be destroyed.
+ *   Implementations that support such keys may either allow their creation
+ *   through the PSA Cryptography API, preferably only to applications with
+ *   the appropriate privilege, or only expose keys created through
+ *   implementation-specific means such as a factory ROM engraving process.
+ *   Note that keys that are read-only due to policy restrictions
+ *   rather than due to physical limitations should not have this
+ *   persistence levels.
+ *
+ * \note Key persistence levels are 8-bit values. Key management
+ *       interfaces operate on lifetimes (type ::psa_key_lifetime_t) which
+ *       encode the persistence as the lower 8 bits of a 32-bit value.
+ */
+typedef uint8_t psa_key_persistence_t;
+
+/** Encoding of key location indicators.
+ *
+ * If an implementation of this API can make calls to external
+ * cryptoprocessors such as secure elements, the location of a key
+ * indicates which secure element performs the operations on the key.
+ * If an implementation offers multiple physical locations for persistent
+ * storage, the location indicator reflects at which physical location
+ * the key is stored.
+ *
+ * This specification defines the following values of location indicators:
+ * - \c 0: primary local storage.
+ *   All implementations should support this value.
+ *   The primary local storage is typically the same storage area that
+ *   contains the key metadata.
+ * - \c 1: primary secure element.
+ *   Implementations should support this value if there is a secure element
+ *   attached to the operating environment.
+ *   As a guideline, secure elements may provide higher resistance against
+ *   side channel and physical attacks than the primary local storage, but may
+ *   have restrictions on supported key types, sizes, policies and operations
+ *   and may have different performance characteristics.
+ * - \c 2-0x7fffff: other locations defined by a PSA specification.
+ *   The PSA Cryptography API does not currently assign any meaning to these
+ *   locations, but future versions of this specification or other PSA
+ *   specifications may do so.
+ * - \c 0x800000-0xffffff: vendor-defined locations.
+ *   No PSA specification will assign a meaning to locations in this range.
+ *
+ * \note Key location indicators are 24-bit values. Key management
+ *       interfaces operate on lifetimes (type ::psa_key_lifetime_t) which
+ *       encode the location as the upper 24 bits of a 32-bit value.
+ */
+typedef uint32_t psa_key_location_t;
+
+/** Encoding of identifiers of persistent keys.
+ *
+ * - Applications may freely choose key identifiers in the range
+ *   #PSA_KEY_ID_USER_MIN to #PSA_KEY_ID_USER_MAX.
+ * - Implementations may define additional key identifiers in the range
+ *   #PSA_KEY_ID_VENDOR_MIN to #PSA_KEY_ID_VENDOR_MAX.
+ * - 0 is reserved as an invalid key identifier.
+ * - Key identifiers outside these ranges are reserved for future use.
+ */
+typedef uint32_t psa_key_id_t;
+#define PSA_KEY_ID_INIT 0
+
+/**@}*/
+
+/** \defgroup policy Key policies
+ * @{
+ */
+
+/** \brief Encoding of permitted usage on a key. */
+typedef uint32_t psa_key_usage_t;
+
+/**@}*/
+
+/** \defgroup attributes Key attributes
+ * @{
+ */
+
+/** The type of a structure containing key attributes.
+ *
+ * This is an opaque structure that can represent the metadata of a key
+ * object. Metadata that can be stored in attributes includes:
+ * - The location of the key in storage, indicated by its key identifier
+ *   and its lifetime.
+ * - The key's policy, comprising usage flags and a specification of
+ *   the permitted algorithm(s).
+ * - Information about the key itself: the key type and its size.
+ * - Implementations may define additional attributes.
+ *
+ * The actual key material is not considered an attribute of a key.
+ * Key attributes do not contain information that is generally considered
+ * highly confidential.
+ *
+ * An attribute structure can be a simple data structure where each function
+ * `psa_set_key_xxx` sets a field and the corresponding function
+ * `psa_get_key_xxx` retrieves the value of the corresponding field.
+ * However, implementations may report values that are equivalent to the
+ * original one, but have a different encoding. For example, an
+ * implementation may use a more compact representation for types where
+ * many bit-patterns are invalid or not supported, and store all values
+ * that it does not support as a special marker value. In such an
+ * implementation, after setting an invalid value, the corresponding
+ * get function returns an invalid value which may not be the one that
+ * was originally stored.
+ *
+ * An attribute structure may contain references to auxiliary resources,
+ * for example pointers to allocated memory or indirect references to
+ * pre-calculated values. In order to free such resources, the application
+ * must call psa_reset_key_attributes(). As an exception, calling
+ * psa_reset_key_attributes() on an attribute structure is optional if
+ * the structure has only been modified by the following functions
+ * since it was initialized or last reset with psa_reset_key_attributes():
+ * - psa_set_key_id()
+ * - psa_set_key_lifetime()
+ * - psa_set_key_type()
+ * - psa_set_key_bits()
+ * - psa_set_key_usage_flags()
+ * - psa_set_key_algorithm()
+ *
+ * Before calling any function on a key attribute structure, the application
+ * must initialize it by any of the following means:
+ * - Set the structure to all-bits-zero, for example:
+ *   \code
+ *   psa_key_attributes_t attributes;
+ *   memset(&attributes, 0, sizeof(attributes));
+ *   \endcode
+ * - Initialize the structure to logical zero values, for example:
+ *   \code
+ *   psa_key_attributes_t attributes = {0};
+ *   \endcode
+ * - Initialize the structure to the initializer #PSA_KEY_ATTRIBUTES_INIT,
+ *   for example:
+ *   \code
+ *   psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
+ *   \endcode
+ * - Assign the result of the function psa_key_attributes_init()
+ *   to the structure, for example:
+ *   \code
+ *   psa_key_attributes_t attributes;
+ *   attributes = psa_key_attributes_init();
+ *   \endcode
+ *
+ * A freshly initialized attribute structure contains the following
+ * values:
+ *
+ * - lifetime: #PSA_KEY_LIFETIME_VOLATILE.
+ * - key identifier: 0 (which is not a valid key identifier).
+ * - type: \c 0 (meaning that the type is unspecified).
+ * - key size: \c 0 (meaning that the size is unspecified).
+ * - usage flags: \c 0 (which allows no usage except exporting a public key).
+ * - algorithm: \c 0 (which allows no cryptographic usage, but allows
+ *   exporting).
+ *
+ * A typical sequence to create a key is as follows:
+ * -# Create and initialize an attribute structure.
+ * -# If the key is persistent, call psa_set_key_id().
+ *    Also call psa_set_key_lifetime() to place the key in a non-default
+ *    location.
+ * -# Set the key policy with psa_set_key_usage_flags() and
+ *    psa_set_key_algorithm().
+ * -# Set the key type with psa_set_key_type().
+ *    Skip this step if copying an existing key with psa_copy_key().
+ * -# When generating a random key with psa_generate_key() or deriving a key
+ *    with psa_key_derivation_output_key(), set the desired key size with
+ *    psa_set_key_bits().
+ * -# Call a key creation function: psa_import_key(), psa_generate_key(),
+ *    psa_key_derivation_output_key() or psa_copy_key(). This function reads
+ *    the attribute structure, creates a key with these attributes, and
+ *    outputs a handle to the newly created key.
+ * -# The attribute structure is now no longer necessary.
+ *    You may call psa_reset_key_attributes(), although this is optional
+ *    with the workflow presented here because the attributes currently
+ *    defined in this specification do not require any additional resources
+ *    beyond the structure itself.
+ *
+ * A typical sequence to query a key's attributes is as follows:
+ * -# Call psa_get_key_attributes().
+ * -# Call `psa_get_key_xxx` functions to retrieve the attribute(s) that
+ *    you are interested in.
+ * -# Call psa_reset_key_attributes() to free any resources that may be
+ *    used by the attribute structure.
+ *
+ * Once a key has been created, it is impossible to change its attributes.
+ */
+typedef struct psa_client_key_attributes_s psa_key_attributes_t;
+
+/**@}*/
+
+/** \defgroup derivation Key derivation
+ * @{
+ */
+
+/** \brief Encoding of the step of a key derivation. */
+typedef uint16_t psa_key_derivation_step_t;
+
+/**@}*/
+
+#endif /* PSA_CRYPTO_TYPES_H */
diff --git a/components/service/crypto/include/psa/crypto_values.h b/components/service/crypto/include/psa/crypto_values.h
new file mode 100644
index 0000000..43b54b1
--- /dev/null
+++ b/components/service/crypto/include/psa/crypto_values.h
@@ -0,0 +1,1916 @@
+/*
+ * Copyright (c) 2018-2021, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+/**
+ * \file psa/crypto_values.h
+ *
+ * \brief PSA cryptography module: macros to build and analyze integer values.
+ *
+ * \note This file may not be included directly. Applications must
+ * include psa/crypto.h. Drivers must include the appropriate driver
+ * header file.
+ *
+ * This file contains portable definitions of macros to build and analyze
+ * values of integral types that encode properties of cryptographic keys,
+ * designations of cryptographic algorithms, and error codes returned by
+ * the library.
+ *
+ * This header file only defines preprocessor macros.
+ */
+
+#ifndef PSA_CRYPTO_VALUES_H
+#define PSA_CRYPTO_VALUES_H
+
+/** \defgroup error Error codes
+ * @{
+ */
+
+/* PSA error codes */
+
+/** The action was completed successfully. */
+#define PSA_SUCCESS ((psa_status_t)0)
+
+/** An error occurred that does not correspond to any defined
+ * failure cause.
+ *
+ * Implementations may use this error code if none of the other standard
+ * error codes are applicable. */
+#define PSA_ERROR_GENERIC_ERROR         ((psa_status_t)-132)
+
+/** The requested operation or a parameter is not supported
+ * by this implementation.
+ *
+ * Implementations should return this error code when an enumeration
+ * parameter such as a key type, algorithm, etc. is not recognized.
+ * If a combination of parameters is recognized and identified as
+ * not valid, return #PSA_ERROR_INVALID_ARGUMENT instead. */
+#define PSA_ERROR_NOT_SUPPORTED         ((psa_status_t)-134)
+
+/** The requested action is denied by a policy.
+ *
+ * Implementations should return this error code when the parameters
+ * are recognized as valid and supported, and a policy explicitly
+ * denies the requested operation.
+ *
+ * If a subset of the parameters of a function call identify a
+ * forbidden operation, and another subset of the parameters are
+ * not valid or not supported, it is unspecified whether the function
+ * returns #PSA_ERROR_NOT_PERMITTED, #PSA_ERROR_NOT_SUPPORTED or
+ * #PSA_ERROR_INVALID_ARGUMENT. */
+#define PSA_ERROR_NOT_PERMITTED         ((psa_status_t)-133)
+
+/** An output buffer is too small.
+ *
+ * Applications can call the \c PSA_xxx_SIZE macro listed in the function
+ * description to determine a sufficient buffer size.
+ *
+ * Implementations should preferably return this error code only
+ * in cases when performing the operation with a larger output
+ * buffer would succeed. However implementations may return this
+ * error if a function has invalid or unsupported parameters in addition
+ * to the parameters that determine the necessary output buffer size. */
+#define PSA_ERROR_BUFFER_TOO_SMALL      ((psa_status_t)-138)
+
+/** Asking for an item that already exists
+ *
+ * Implementations should return this error, when attempting
+ * to write an item (like a key) that already exists. */
+#define PSA_ERROR_ALREADY_EXISTS        ((psa_status_t)-139)
+
+/** Asking for an item that doesn't exist
+ *
+ * Implementations should return this error, if a requested item (like
+ * a key) does not exist. */
+#define PSA_ERROR_DOES_NOT_EXIST        ((psa_status_t)-140)
+
+/** The requested action cannot be performed in the current state.
+ *
+ * Multipart operations return this error when one of the
+ * functions is called out of sequence. Refer to the function
+ * descriptions for permitted sequencing of functions.
+ *
+ * Implementations shall not return this error code to indicate
+ * that a key either exists or not,
+ * but shall instead return #PSA_ERROR_ALREADY_EXISTS or #PSA_ERROR_DOES_NOT_EXIST
+ * as applicable.
+ *
+ * Implementations shall not return this error code to indicate that a
+ * key identifier is invalid, but shall return #PSA_ERROR_INVALID_HANDLE
+ * instead. */
+#define PSA_ERROR_BAD_STATE             ((psa_status_t)-137)
+
+/** The parameters passed to the function are invalid.
+ *
+ * Implementations may return this error any time a parameter or
+ * combination of parameters are recognized as invalid.
+ *
+ * Implementations shall not return this error code to indicate that a
+ * key identifier is invalid, but shall return #PSA_ERROR_INVALID_HANDLE
+ * instead.
+ */
+#define PSA_ERROR_INVALID_ARGUMENT      ((psa_status_t)-135)
+
+/** There is not enough runtime memory.
+ *
+ * If the action is carried out across multiple security realms, this
+ * error can refer to available memory in any of the security realms. */
+#define PSA_ERROR_INSUFFICIENT_MEMORY   ((psa_status_t)-141)
+
+/** There is not enough persistent storage.
+ *
+ * Functions that modify the key storage return this error code if
+ * there is insufficient storage space on the host media. In addition,
+ * many functions that do not otherwise access storage may return this
+ * error code if the implementation requires a mandatory log entry for
+ * the requested action and the log storage space is full. */
+#define PSA_ERROR_INSUFFICIENT_STORAGE  ((psa_status_t)-142)
+
+/** There was a communication failure inside the implementation.
+ *
+ * This can indicate a communication failure between the application
+ * and an external cryptoprocessor or between the cryptoprocessor and
+ * an external volatile or persistent memory. A communication failure
+ * may be transient or permanent depending on the cause.
+ *
+ * \warning If a function returns this error, it is undetermined
+ * whether the requested action has completed or not. Implementations
+ * should return #PSA_SUCCESS on successful completion whenever
+ * possible, however functions may return #PSA_ERROR_COMMUNICATION_FAILURE
+ * if the requested action was completed successfully in an external
+ * cryptoprocessor but there was a breakdown of communication before
+ * the cryptoprocessor could report the status to the application.
+ */
+#define PSA_ERROR_COMMUNICATION_FAILURE ((psa_status_t)-145)
+
+/** There was a storage failure that may have led to data loss.
+ *
+ * This error indicates that some persistent storage is corrupted.
+ * It should not be used for a corruption of volatile memory
+ * (use #PSA_ERROR_CORRUPTION_DETECTED), for a communication error
+ * between the cryptoprocessor and its external storage (use
+ * #PSA_ERROR_COMMUNICATION_FAILURE), or when the storage is
+ * in a valid state but is full (use #PSA_ERROR_INSUFFICIENT_STORAGE).
+ *
+ * Note that a storage failure does not indicate that any data that was
+ * previously read is invalid. However this previously read data may no
+ * longer be readable from storage.
+ *
+ * When a storage failure occurs, it is no longer possible to ensure
+ * the global integrity of the keystore. Depending on the global
+ * integrity guarantees offered by the implementation, access to other
+ * data may or may not fail even if the data is still readable but
+ * its integrity cannot be guaranteed.
+ *
+ * Implementations should only use this error code to report a
+ * permanent storage corruption. However application writers should
+ * keep in mind that transient errors while reading the storage may be
+ * reported using this error code. */
+#define PSA_ERROR_STORAGE_FAILURE       ((psa_status_t)-146)
+
+/** A hardware failure was detected.
+ *
+ * A hardware failure may be transient or permanent depending on the
+ * cause. */
+#define PSA_ERROR_HARDWARE_FAILURE      ((psa_status_t)-147)
+
+/** A tampering attempt was detected.
+ *
+ * If an application receives this error code, there is no guarantee
+ * that previously accessed or computed data was correct and remains
+ * confidential. Applications should not perform any security function
+ * and should enter a safe failure state.
+ *
+ * Implementations may return this error code if they detect an invalid
+ * state that cannot happen during normal operation and that indicates
+ * that the implementation's security guarantees no longer hold. Depending
+ * on the implementation architecture and on its security and safety goals,
+ * the implementation may forcibly terminate the application.
+ *
+ * This error code is intended as a last resort when a security breach
+ * is detected and it is unsure whether the keystore data is still
+ * protected. Implementations shall only return this error code
+ * to report an alarm from a tampering detector, to indicate that
+ * the confidentiality of stored data can no longer be guaranteed,
+ * or to indicate that the integrity of previously returned data is now
+ * considered compromised. Implementations shall not use this error code
+ * to indicate a hardware failure that merely makes it impossible to
+ * perform the requested operation (use #PSA_ERROR_COMMUNICATION_FAILURE,
+ * #PSA_ERROR_STORAGE_FAILURE, #PSA_ERROR_HARDWARE_FAILURE,
+ * #PSA_ERROR_INSUFFICIENT_ENTROPY or other applicable error code
+ * instead).
+ *
+ * This error indicates an attack against the application. Implementations
+ * shall not return this error code as a consequence of the behavior of
+ * the application itself. */
+#define PSA_ERROR_CORRUPTION_DETECTED    ((psa_status_t)-151)
+
+/** There is not enough entropy to generate random data needed
+ * for the requested action.
+ *
+ * This error indicates a failure of a hardware random generator.
+ * Application writers should note that this error can be returned not
+ * only by functions whose purpose is to generate random data, such
+ * as key, IV or nonce generation, but also by functions that execute
+ * an algorithm with a randomized result, as well as functions that
+ * use randomization of intermediate computations as a countermeasure
+ * to certain attacks.
+ *
+ * Implementations should avoid returning this error after psa_crypto_init()
+ * has succeeded. Implementations should generate sufficient
+ * entropy during initialization and subsequently use a cryptographically
+ * secure pseudorandom generator (PRNG). However implementations may return
+ * this error at any time if a policy requires the PRNG to be reseeded
+ * during normal operation. */
+#define PSA_ERROR_INSUFFICIENT_ENTROPY  ((psa_status_t)-148)
+
+/** The signature, MAC or hash is incorrect.
+ *
+ * Verification functions return this error if the verification
+ * calculations completed successfully, and the value to be verified
+ * was determined to be incorrect.
+ *
+ * If the value to verify has an invalid size, implementations may return
+ * either #PSA_ERROR_INVALID_ARGUMENT or #PSA_ERROR_INVALID_SIGNATURE. */
+#define PSA_ERROR_INVALID_SIGNATURE     ((psa_status_t)-149)
+
+/** The decrypted padding is incorrect.
+ *
+ * \warning In some protocols, when decrypting data, it is essential that
+ * the behavior of the application does not depend on whether the padding
+ * is correct, down to precise timing. Applications should prefer
+ * protocols that use authenticated encryption rather than plain
+ * encryption. If the application must perform a decryption of
+ * unauthenticated data, the application writer should take care not
+ * to reveal whether the padding is invalid.
+ *
+ * Implementations should strive to make valid and invalid padding
+ * as close as possible to indistinguishable to an external observer.
+ * In particular, the timing of a decryption operation should not
+ * depend on the validity of the padding. */
+#define PSA_ERROR_INVALID_PADDING       ((psa_status_t)-150)
+
+/** Return this error when there's insufficient data when attempting
+ * to read from a resource. */
+#define PSA_ERROR_INSUFFICIENT_DATA     ((psa_status_t)-143)
+
+/** The key identifier is not valid. See also :ref:\`key-handles\`.
+ */
+#define PSA_ERROR_INVALID_HANDLE        ((psa_status_t)-136)
+
+/** Stored data has been corrupted.
+ *
+ * This error indicates that some persistent storage has suffered corruption.
+ * It does not indicate the following situations, which have specific error
+ * codes:
+ *
+ * - A corruption of volatile memory - use #PSA_ERROR_CORRUPTION_DETECTED.
+ * - A communication error between the cryptoprocessor and its external
+ *   storage - use #PSA_ERROR_COMMUNICATION_FAILURE.
+ * - When the storage is in a valid state but is full - use
+ *   #PSA_ERROR_INSUFFICIENT_STORAGE.
+ * - When the storage fails for other reasons - use
+ *   #PSA_ERROR_STORAGE_FAILURE.
+ * - When the stored data is not valid - use #PSA_ERROR_DATA_INVALID.
+ *
+ * \note A storage corruption does not indicate that any data that was
+ * previously read is invalid. However this previously read data might no
+ * longer be readable from storage.
+ *
+ * When a storage failure occurs, it is no longer possible to ensure the
+ * global integrity of the keystore.
+ */
+#define PSA_ERROR_DATA_CORRUPT          ((psa_status_t)-152)
+
+/** Data read from storage is not valid for the implementation.
+ *
+ * This error indicates that some data read from storage does not have a valid
+ * format. It does not indicate the following situations, which have specific
+ * error codes:
+ *
+ * - When the storage or stored data is corrupted - use #PSA_ERROR_DATA_CORRUPT
+ * - When the storage fails for other reasons - use #PSA_ERROR_STORAGE_FAILURE
+ * - An invalid argument to the API - use #PSA_ERROR_INVALID_ARGUMENT
+ *
+ * This error is typically a result of either storage corruption on a
+ * cleartext storage backend, or an attempt to read data that was
+ * written by an incompatible version of the library.
+ */
+#define PSA_ERROR_DATA_INVALID          ((psa_status_t)-153)
+
+/**@}*/
+
+/** \defgroup crypto_types Key and algorithm types
+ * @{
+ */
+
+/** An invalid key type value.
+ *
+ * Zero is not the encoding of any key type.
+ */
+#define PSA_KEY_TYPE_NONE                           ((psa_key_type_t)0x0000)
+
+/** Vendor-defined key type flag.
+ *
+ * Key types defined by this standard will never have the
+ * #PSA_KEY_TYPE_VENDOR_FLAG bit set. Vendors who define additional key types
+ * must use an encoding with the #PSA_KEY_TYPE_VENDOR_FLAG bit set and should
+ * respect the bitwise structure used by standard encodings whenever practical.
+ */
+#define PSA_KEY_TYPE_VENDOR_FLAG                    ((psa_key_type_t)0x8000)
+
+#define PSA_KEY_TYPE_CATEGORY_MASK                  ((psa_key_type_t)0x7000)
+#define PSA_KEY_TYPE_CATEGORY_RAW                   ((psa_key_type_t)0x1000)
+#define PSA_KEY_TYPE_CATEGORY_SYMMETRIC             ((psa_key_type_t)0x2000)
+#define PSA_KEY_TYPE_CATEGORY_PUBLIC_KEY            ((psa_key_type_t)0x4000)
+#define PSA_KEY_TYPE_CATEGORY_KEY_PAIR              ((psa_key_type_t)0x7000)
+
+#define PSA_KEY_TYPE_CATEGORY_FLAG_PAIR             ((psa_key_type_t)0x3000)
+
+/** Whether a key type is vendor-defined.
+ *
+ * See also #PSA_KEY_TYPE_VENDOR_FLAG.
+ */
+#define PSA_KEY_TYPE_IS_VENDOR_DEFINED(type) \
+    (((type) & PSA_KEY_TYPE_VENDOR_FLAG) != 0)
+
+/** Whether a key type is an unstructured array of bytes.
+ *
+ * This encompasses both symmetric keys and non-key data.
+ */
+#define PSA_KEY_TYPE_IS_UNSTRUCTURED(type) \
+    (((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_RAW || \
+     ((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_SYMMETRIC)
+
+/** Whether a key type is asymmetric: either a key pair or a public key. */
+#define PSA_KEY_TYPE_IS_ASYMMETRIC(type)                                \
+    (((type) & PSA_KEY_TYPE_CATEGORY_MASK                               \
+      & ~PSA_KEY_TYPE_CATEGORY_FLAG_PAIR) ==                            \
+     PSA_KEY_TYPE_CATEGORY_PUBLIC_KEY)
+/** Whether a key type is the public part of a key pair. */
+#define PSA_KEY_TYPE_IS_PUBLIC_KEY(type)                                \
+    (((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_PUBLIC_KEY)
+/** Whether a key type is a key pair containing a private part and a public
+ * part. */
+#define PSA_KEY_TYPE_IS_KEY_PAIR(type)                                   \
+    (((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_KEY_PAIR)
+/** The key pair type corresponding to a public key type.
+ *
+ * You may also pass a key pair type as \p type, it will be left unchanged.
+ *
+ * \param type      A public key type or key pair type.
+ *
+ * \return          The corresponding key pair type.
+ *                  If \p type is not a public key or a key pair,
+ *                  the return value is undefined.
+ */
+#define PSA_KEY_TYPE_KEY_PAIR_OF_PUBLIC_KEY(type)        \
+    ((type) | PSA_KEY_TYPE_CATEGORY_FLAG_PAIR)
+/** The public key type corresponding to a key pair type.
+ *
+ * You may also pass a key pair type as \p type, it will be left unchanged.
+ *
+ * \param type      A public key type or key pair type.
+ *
+ * \return          The corresponding public key type.
+ *                  If \p type is not a public key or a key pair,
+ *                  the return value is undefined.
+ */
+#define PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(type)        \
+    ((type) & ~PSA_KEY_TYPE_CATEGORY_FLAG_PAIR)
+
+/** Raw data.
+ *
+ * A "key" of this type cannot be used for any cryptographic operation.
+ * Applications may use this type to store arbitrary data in the keystore. */
+#define PSA_KEY_TYPE_RAW_DATA                       ((psa_key_type_t)0x1001)
+
+/** HMAC key.
+ *
+ * The key policy determines which underlying hash algorithm the key can be
+ * used for.
+ *
+ * HMAC keys should generally have the same size as the underlying hash.
+ * This size can be calculated with #PSA_HASH_LENGTH(\c alg) where
+ * \c alg is the HMAC algorithm or the underlying hash algorithm. */
+#define PSA_KEY_TYPE_HMAC                           ((psa_key_type_t)0x1100)
+
+/** A secret for key derivation.
+ *
+ * The key policy determines which key derivation algorithm the key
+ * can be used for.
+ */
+#define PSA_KEY_TYPE_DERIVE                         ((psa_key_type_t)0x1200)
+
+/** Key for a cipher, AEAD or MAC algorithm based on the AES block cipher.
+ *
+ * The size of the key can be 16 bytes (AES-128), 24 bytes (AES-192) or
+ * 32 bytes (AES-256).
+ */
+#define PSA_KEY_TYPE_AES                            ((psa_key_type_t)0x2400)
+
+/** Key for a cipher or MAC algorithm based on DES or 3DES (Triple-DES).
+ *
+ * The size of the key can be 8 bytes (single DES), 16 bytes (2-key 3DES) or
+ * 24 bytes (3-key 3DES).
+ *
+ * Note that single DES and 2-key 3DES are weak and strongly
+ * deprecated and should only be used to decrypt legacy data. 3-key 3DES
+ * is weak and deprecated and should only be used in legacy protocols.
+ */
+#define PSA_KEY_TYPE_DES                            ((psa_key_type_t)0x2301)
+
+/** Key for a cipher, AEAD or MAC algorithm based on the
+ * Camellia block cipher. */
+#define PSA_KEY_TYPE_CAMELLIA                       ((psa_key_type_t)0x2403)
+
+/** Key for the RC4 stream cipher.
+ *
+ * Note that RC4 is weak and deprecated and should only be used in
+ * legacy protocols. */
+#define PSA_KEY_TYPE_ARC4                           ((psa_key_type_t)0x2002)
+
+/** Key for the ChaCha20 stream cipher or the Chacha20-Poly1305 AEAD algorithm.
+ *
+ * ChaCha20 and the ChaCha20_Poly1305 construction are defined in RFC 7539.
+ *
+ * Implementations must support 12-byte nonces, may support 8-byte nonces,
+ * and should reject other sizes.
+ */
+#define PSA_KEY_TYPE_CHACHA20                       ((psa_key_type_t)0x2004)
+
+/** RSA public key. */
+#define PSA_KEY_TYPE_RSA_PUBLIC_KEY                 ((psa_key_type_t)0x4001)
+/** RSA key pair (private and public key). */
+#define PSA_KEY_TYPE_RSA_KEY_PAIR                   ((psa_key_type_t)0x7001)
+/** Whether a key type is an RSA key (pair or public-only). */
+#define PSA_KEY_TYPE_IS_RSA(type)                                       \
+    (PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(type) == PSA_KEY_TYPE_RSA_PUBLIC_KEY)
+
+#define PSA_KEY_TYPE_ECC_PUBLIC_KEY_BASE            ((psa_key_type_t)0x4100)
+#define PSA_KEY_TYPE_ECC_KEY_PAIR_BASE              ((psa_key_type_t)0x7100)
+#define PSA_KEY_TYPE_ECC_CURVE_MASK                 ((psa_key_type_t)0x00ff)
+/** Elliptic curve key pair.
+ *
+ * \param curve     A value of type ::psa_ecc_family_t that
+ *                  identifies the ECC curve to be used.
+ */
+#define PSA_KEY_TYPE_ECC_KEY_PAIR(curve)         \
+    (PSA_KEY_TYPE_ECC_KEY_PAIR_BASE | (curve))
+/** Elliptic curve public key.
+ *
+ * \param curve     A value of type ::psa_ecc_family_t that
+ *                  identifies the ECC curve to be used.
+ */
+#define PSA_KEY_TYPE_ECC_PUBLIC_KEY(curve)              \
+    (PSA_KEY_TYPE_ECC_PUBLIC_KEY_BASE | (curve))
+
+/** Whether a key type is an elliptic curve key (pair or public-only). */
+#define PSA_KEY_TYPE_IS_ECC(type)                                       \
+    ((PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(type) &                        \
+      ~PSA_KEY_TYPE_ECC_CURVE_MASK) == PSA_KEY_TYPE_ECC_PUBLIC_KEY_BASE)
+/** Whether a key type is an elliptic curve key pair. */
+#define PSA_KEY_TYPE_IS_ECC_KEY_PAIR(type)                               \
+    (((type) & ~PSA_KEY_TYPE_ECC_CURVE_MASK) ==                         \
+     PSA_KEY_TYPE_ECC_KEY_PAIR_BASE)
+/** Whether a key type is an elliptic curve public key. */
+#define PSA_KEY_TYPE_IS_ECC_PUBLIC_KEY(type)                            \
+    (((type) & ~PSA_KEY_TYPE_ECC_CURVE_MASK) ==                         \
+     PSA_KEY_TYPE_ECC_PUBLIC_KEY_BASE)
+
+/** Extract the curve from an elliptic curve key type. */
+#define PSA_KEY_TYPE_ECC_GET_FAMILY(type)                        \
+    ((psa_ecc_family_t) (PSA_KEY_TYPE_IS_ECC(type) ?             \
+                        ((type) & PSA_KEY_TYPE_ECC_CURVE_MASK) : \
+                        0))
+
+/** SEC Koblitz curves over prime fields.
+ *
+ * This family comprises the following curves:
+ * secp192k1, secp224k1, secp256k1.
+ * They are defined in _Standards for Efficient Cryptography_,
+ * _SEC 2: Recommended Elliptic Curve Domain Parameters_.
+ * https://www.secg.org/sec2-v2.pdf
+ */
+#define PSA_ECC_FAMILY_SECP_K1           ((psa_ecc_family_t) 0x17)
+
+/** SEC random curves over prime fields.
+ *
+ * This family comprises the following curves:
+ * secp192k1, secp224r1, secp256r1, secp384r1, secp521r1.
+ * They are defined in _Standards for Efficient Cryptography_,
+ * _SEC 2: Recommended Elliptic Curve Domain Parameters_.
+ * https://www.secg.org/sec2-v2.pdf
+ */
+#define PSA_ECC_FAMILY_SECP_R1           ((psa_ecc_family_t) 0x12)
+/* SECP160R2 (SEC2 v1, obsolete) */
+#define PSA_ECC_FAMILY_SECP_R2           ((psa_ecc_family_t) 0x1b)
+
+/** SEC Koblitz curves over binary fields.
+ *
+ * This family comprises the following curves:
+ * sect163k1, sect233k1, sect239k1, sect283k1, sect409k1, sect571k1.
+ * They are defined in _Standards for Efficient Cryptography_,
+ * _SEC 2: Recommended Elliptic Curve Domain Parameters_.
+ * https://www.secg.org/sec2-v2.pdf
+ */
+#define PSA_ECC_FAMILY_SECT_K1           ((psa_ecc_family_t) 0x27)
+
+/** SEC random curves over binary fields.
+ *
+ * This family comprises the following curves:
+ * sect163r1, sect233r1, sect283r1, sect409r1, sect571r1.
+ * They are defined in _Standards for Efficient Cryptography_,
+ * _SEC 2: Recommended Elliptic Curve Domain Parameters_.
+ * https://www.secg.org/sec2-v2.pdf
+ */
+#define PSA_ECC_FAMILY_SECT_R1           ((psa_ecc_family_t) 0x22)
+
+/** SEC additional random curves over binary fields.
+ *
+ * This family comprises the following curve:
+ * sect163r2.
+ * It is defined in _Standards for Efficient Cryptography_,
+ * _SEC 2: Recommended Elliptic Curve Domain Parameters_.
+ * https://www.secg.org/sec2-v2.pdf
+ */
+#define PSA_ECC_FAMILY_SECT_R2           ((psa_ecc_family_t) 0x2b)
+
+/** Brainpool P random curves.
+ *
+ * This family comprises the following curves:
+ * brainpoolP160r1, brainpoolP192r1, brainpoolP224r1, brainpoolP256r1,
+ * brainpoolP320r1, brainpoolP384r1, brainpoolP512r1.
+ * It is defined in RFC 5639.
+ */
+#define PSA_ECC_FAMILY_BRAINPOOL_P_R1    ((psa_ecc_family_t) 0x30)
+
+/** Curve25519 and Curve448.
+ *
+ * This family comprises the following Montgomery curves:
+ * - 255-bit: Bernstein et al.,
+ *   _Curve25519: new Diffie-Hellman speed records_, LNCS 3958, 2006.
+ *   The algorithm #PSA_ALG_ECDH performs X25519 when used with this curve.
+ * - 448-bit: Hamburg,
+ *   _Ed448-Goldilocks, a new elliptic curve_, NIST ECC Workshop, 2015.
+ *   The algorithm #PSA_ALG_ECDH performs X448 when used with this curve.
+ */
+#define PSA_ECC_FAMILY_MONTGOMERY        ((psa_ecc_family_t) 0x41)
+
+#define PSA_KEY_TYPE_DH_PUBLIC_KEY_BASE             ((psa_key_type_t)0x4200)
+#define PSA_KEY_TYPE_DH_KEY_PAIR_BASE               ((psa_key_type_t)0x7200)
+#define PSA_KEY_TYPE_DH_GROUP_MASK                  ((psa_key_type_t)0x00ff)
+/** Diffie-Hellman key pair.
+ *
+ * \param group     A value of type ::psa_dh_family_t that identifies the
+ *                  Diffie-Hellman group to be used.
+ */
+#define PSA_KEY_TYPE_DH_KEY_PAIR(group)          \
+    (PSA_KEY_TYPE_DH_KEY_PAIR_BASE | (group))
+/** Diffie-Hellman public key.
+ *
+ * \param group     A value of type ::psa_dh_family_t that identifies the
+ *                  Diffie-Hellman group to be used.
+ */
+#define PSA_KEY_TYPE_DH_PUBLIC_KEY(group)               \
+    (PSA_KEY_TYPE_DH_PUBLIC_KEY_BASE | (group))
+
+/** Whether a key type is a Diffie-Hellman key (pair or public-only). */
+#define PSA_KEY_TYPE_IS_DH(type)                                        \
+    ((PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(type) &                        \
+      ~PSA_KEY_TYPE_DH_GROUP_MASK) == PSA_KEY_TYPE_DH_PUBLIC_KEY_BASE)
+/** Whether a key type is a Diffie-Hellman key pair. */
+#define PSA_KEY_TYPE_IS_DH_KEY_PAIR(type)                               \
+    (((type) & ~PSA_KEY_TYPE_DH_GROUP_MASK) ==                         \
+     PSA_KEY_TYPE_DH_KEY_PAIR_BASE)
+/** Whether a key type is a Diffie-Hellman public key. */
+#define PSA_KEY_TYPE_IS_DH_PUBLIC_KEY(type)                            \
+    (((type) & ~PSA_KEY_TYPE_DH_GROUP_MASK) ==                         \
+     PSA_KEY_TYPE_DH_PUBLIC_KEY_BASE)
+
+/** Extract the group from a Diffie-Hellman key type. */
+#define PSA_KEY_TYPE_DH_GET_FAMILY(type)                        \
+    ((psa_dh_family_t) (PSA_KEY_TYPE_IS_DH(type) ?              \
+                       ((type) & PSA_KEY_TYPE_DH_GROUP_MASK) :  \
+                       0))
+
+/** Diffie-Hellman groups defined in RFC 7919 Appendix A.
+ *
+ * This family includes groups with the following key sizes (in bits):
+ * 2048, 3072, 4096, 6144, 8192. A given implementation may support
+ * all of these sizes or only a subset.
+ */
+#define PSA_DH_FAMILY_RFC7919            ((psa_dh_family_t) 0x03)
+
+#define PSA_GET_KEY_TYPE_BLOCK_SIZE_EXPONENT(type)      \
+    (((type) >> 8) & 7)
+/** The block size of a block cipher.
+ *
+ * \param type  A cipher key type (value of type #psa_key_type_t).
+ *
+ * \return      The block size for a block cipher, or 1 for a stream cipher.
+ *              The return value is undefined if \p type is not a supported
+ *              cipher key type.
+ *
+ * \note It is possible to build stream cipher algorithms on top of a block
+ *       cipher, for example CTR mode (#PSA_ALG_CTR).
+ *       This macro only takes the key type into account, so it cannot be
+ *       used to determine the size of the data that #psa_cipher_update()
+ *       might buffer for future processing in general.
+ *
+ * \note This macro returns a compile-time constant if its argument is one.
+ *
+ * \warning This macro may evaluate its argument multiple times.
+ */
+#define PSA_BLOCK_CIPHER_BLOCK_LENGTH(type)                                     \
+    (((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_SYMMETRIC ? \
+     1u << PSA_GET_KEY_TYPE_BLOCK_SIZE_EXPONENT(type) :                         \
+     0u)
+
+/** Vendor-defined algorithm flag.
+ *
+ * Algorithms defined by this standard will never have the #PSA_ALG_VENDOR_FLAG
+ * bit set. Vendors who define additional algorithms must use an encoding with
+ * the #PSA_ALG_VENDOR_FLAG bit set and should respect the bitwise structure
+ * used by standard encodings whenever practical.
+ */
+#define PSA_ALG_VENDOR_FLAG                     ((psa_algorithm_t)0x80000000)
+
+#define PSA_ALG_CATEGORY_MASK                   ((psa_algorithm_t)0x7f000000)
+#define PSA_ALG_CATEGORY_HASH                   ((psa_algorithm_t)0x02000000)
+#define PSA_ALG_CATEGORY_MAC                    ((psa_algorithm_t)0x03000000)
+#define PSA_ALG_CATEGORY_CIPHER                 ((psa_algorithm_t)0x04000000)
+#define PSA_ALG_CATEGORY_AEAD                   ((psa_algorithm_t)0x05000000)
+#define PSA_ALG_CATEGORY_SIGN                   ((psa_algorithm_t)0x06000000)
+#define PSA_ALG_CATEGORY_ASYMMETRIC_ENCRYPTION  ((psa_algorithm_t)0x07000000)
+#define PSA_ALG_CATEGORY_KEY_DERIVATION         ((psa_algorithm_t)0x08000000)
+#define PSA_ALG_CATEGORY_KEY_AGREEMENT          ((psa_algorithm_t)0x09000000)
+
+/** Whether an algorithm is vendor-defined.
+ *
+ * See also #PSA_ALG_VENDOR_FLAG.
+ */
+#define PSA_ALG_IS_VENDOR_DEFINED(alg)                                  \
+    (((alg) & PSA_ALG_VENDOR_FLAG) != 0)
+
+/** Whether the specified algorithm is a hash algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a hash algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_HASH(alg)                                            \
+    (((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_HASH)
+
+/** Whether the specified algorithm is a MAC algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a MAC algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_MAC(alg)                                             \
+    (((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_MAC)
+
+/** Whether the specified algorithm is a symmetric cipher algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a symmetric cipher algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_CIPHER(alg)                                          \
+    (((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_CIPHER)
+
+/** Whether the specified algorithm is an authenticated encryption
+ * with associated data (AEAD) algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is an AEAD algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_AEAD(alg)                                            \
+    (((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_AEAD)
+
+/** Whether the specified algorithm is an asymmetric signature algorithm,
+ * also known as public-key signature algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is an asymmetric signature algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_SIGN(alg)                                            \
+    (((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_SIGN)
+
+/** Whether the specified algorithm is an asymmetric encryption algorithm,
+ * also known as public-key encryption algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is an asymmetric encryption algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_ASYMMETRIC_ENCRYPTION(alg)                           \
+    (((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_ASYMMETRIC_ENCRYPTION)
+
+/** Whether the specified algorithm is a key agreement algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a key agreement algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_KEY_AGREEMENT(alg)                                   \
+    (((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_KEY_AGREEMENT)
+
+/** Whether the specified algorithm is a key derivation algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a key derivation algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_KEY_DERIVATION(alg)                                  \
+    (((alg) & PSA_ALG_CATEGORY_MASK) == PSA_ALG_CATEGORY_KEY_DERIVATION)
+
+#define PSA_ALG_HASH_MASK                       ((psa_algorithm_t)0x000000ff)
+/** MD2 */
+#define PSA_ALG_MD2                             ((psa_algorithm_t)0x02000001)
+/** MD4 */
+#define PSA_ALG_MD4                             ((psa_algorithm_t)0x02000002)
+/** MD5 */
+#define PSA_ALG_MD5                             ((psa_algorithm_t)0x02000003)
+/** PSA_ALG_RIPEMD160 */
+#define PSA_ALG_RIPEMD160                       ((psa_algorithm_t)0x02000004)
+/** SHA1 */
+#define PSA_ALG_SHA_1                           ((psa_algorithm_t)0x02000005)
+/** SHA2-224 */
+#define PSA_ALG_SHA_224                         ((psa_algorithm_t)0x02000008)
+/** SHA2-256 */
+#define PSA_ALG_SHA_256                         ((psa_algorithm_t)0x02000009)
+/** SHA2-384 */
+#define PSA_ALG_SHA_384                         ((psa_algorithm_t)0x0200000a)
+/** SHA2-512 */
+#define PSA_ALG_SHA_512                         ((psa_algorithm_t)0x0200000b)
+/** SHA2-512/224 */
+#define PSA_ALG_SHA_512_224                     ((psa_algorithm_t)0x0200000c)
+/** SHA2-512/256 */
+#define PSA_ALG_SHA_512_256                     ((psa_algorithm_t)0x0200000d)
+/** SHA3-224 */
+#define PSA_ALG_SHA3_224                        ((psa_algorithm_t)0x02000010)
+/** SHA3-256 */
+#define PSA_ALG_SHA3_256                        ((psa_algorithm_t)0x02000011)
+/** SHA3-384 */
+#define PSA_ALG_SHA3_384                        ((psa_algorithm_t)0x02000012)
+/** SHA3-512 */
+#define PSA_ALG_SHA3_512                        ((psa_algorithm_t)0x02000013)
+
+/** In a hash-and-sign algorithm policy, allow any hash algorithm.
+ *
+ * This value may be used to form the algorithm usage field of a policy
+ * for a signature algorithm that is parametrized by a hash. The key
+ * may then be used to perform operations using the same signature
+ * algorithm parametrized with any supported hash.
+ *
+ * That is, suppose that `PSA_xxx_SIGNATURE` is one of the following macros:
+ * - #PSA_ALG_RSA_PKCS1V15_SIGN, #PSA_ALG_RSA_PSS,
+ * - #PSA_ALG_ECDSA, #PSA_ALG_DETERMINISTIC_ECDSA.
+ * Then you may create and use a key as follows:
+ * - Set the key usage field using #PSA_ALG_ANY_HASH, for example:
+ *   ```
+ *   psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_SIGN_HASH); // or VERIFY
+ *   psa_set_key_algorithm(&attributes, PSA_xxx_SIGNATURE(PSA_ALG_ANY_HASH));
+ *   ```
+ * - Import or generate key material.
+ * - Call psa_sign_hash() or psa_verify_hash(), passing
+ *   an algorithm built from `PSA_xxx_SIGNATURE` and a specific hash. Each
+ *   call to sign or verify a message may use a different hash.
+ *   ```
+ *   psa_sign_hash(key, PSA_xxx_SIGNATURE(PSA_ALG_SHA_256), ...);
+ *   psa_sign_hash(key, PSA_xxx_SIGNATURE(PSA_ALG_SHA_512), ...);
+ *   psa_sign_hash(key, PSA_xxx_SIGNATURE(PSA_ALG_SHA3_256), ...);
+ *   ```
+ *
+ * This value may not be used to build other algorithms that are
+ * parametrized over a hash. For any valid use of this macro to build
+ * an algorithm \c alg, #PSA_ALG_IS_HASH_AND_SIGN(\c alg) is true.
+ *
+ * This value may not be used to build an algorithm specification to
+ * perform an operation. It is only valid to build policies.
+ */
+#define PSA_ALG_ANY_HASH                        ((psa_algorithm_t)0x020000ff)
+
+#define PSA_ALG_MAC_SUBCATEGORY_MASK            ((psa_algorithm_t)0x00c00000)
+#define PSA_ALG_HMAC_BASE                       ((psa_algorithm_t)0x03800000)
+/** Macro to build an HMAC algorithm.
+ *
+ * For example, #PSA_ALG_HMAC(#PSA_ALG_SHA_256) is HMAC-SHA-256.
+ *
+ * \param hash_alg      A hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true).
+ *
+ * \return              The corresponding HMAC algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_HMAC(hash_alg)                                  \
+    (PSA_ALG_HMAC_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+
+#define PSA_ALG_HMAC_GET_HASH(hmac_alg)                             \
+    (PSA_ALG_CATEGORY_HASH | ((hmac_alg) & PSA_ALG_HASH_MASK))
+
+/** Whether the specified algorithm is an HMAC algorithm.
+ *
+ * HMAC is a family of MAC algorithms that are based on a hash function.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is an HMAC algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_HMAC(alg)                                            \
+    (((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_MAC_SUBCATEGORY_MASK)) == \
+     PSA_ALG_HMAC_BASE)
+
+/* In the encoding of a MAC algorithm, the bits corresponding to
+ * PSA_ALG_MAC_TRUNCATION_MASK encode the length to which the MAC is
+ * truncated. As an exception, the value 0 means the untruncated algorithm,
+ * whatever its length is. The length is encoded in 6 bits, so it can
+ * reach up to 63; the largest MAC is 64 bytes so its trivial truncation
+ * to full length is correctly encoded as 0 and any non-trivial truncation
+ * is correctly encoded as a value between 1 and 63. */
+#define PSA_ALG_MAC_TRUNCATION_MASK             ((psa_algorithm_t)0x003f0000)
+#define PSA_MAC_TRUNCATION_OFFSET 16
+
+/* In the encoding of a MAC algorithm, the bit corresponding to
+ * #PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG encodes the fact that the algorithm
+ * is a wildcard algorithm. A key with such wildcard algorithm as permitted
+ * algorithm policy can be used with any algorithm corresponding to the
+ * same base class and having a (potentially truncated) MAC length greater or
+ * equal than the one encoded in #PSA_ALG_MAC_TRUNCATION_MASK. */
+#define PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG   ((psa_algorithm_t)0x00008000)
+
+/** Macro to build a truncated MAC algorithm.
+ *
+ * A truncated MAC algorithm is identical to the corresponding MAC
+ * algorithm except that the MAC value for the truncated algorithm
+ * consists of only the first \p mac_length bytes of the MAC value
+ * for the untruncated algorithm.
+ *
+ * \note    This macro may allow constructing algorithm identifiers that
+ *          are not valid, either because the specified length is larger
+ *          than the untruncated MAC or because the specified length is
+ *          smaller than permitted by the implementation.
+ *
+ * \note    It is implementation-defined whether a truncated MAC that
+ *          is truncated to the same length as the MAC of the untruncated
+ *          algorithm is considered identical to the untruncated algorithm
+ *          for policy comparison purposes.
+ *
+ * \param mac_alg       A MAC algorithm identifier (value of type
+ *                      #psa_algorithm_t such that #PSA_ALG_IS_MAC(\p alg)
+ *                      is true). This may be a truncated or untruncated
+ *                      MAC algorithm.
+ * \param mac_length    Desired length of the truncated MAC in bytes.
+ *                      This must be at most the full length of the MAC
+ *                      and must be at least an implementation-specified
+ *                      minimum. The implementation-specified minimum
+ *                      shall not be zero.
+ *
+ * \return              The corresponding MAC algorithm with the specified
+ *                      length.
+ * \return              Unspecified if \p alg is not a supported
+ *                      MAC algorithm or if \p mac_length is too small or
+ *                      too large for the specified MAC algorithm.
+ */
+#define PSA_ALG_TRUNCATED_MAC(mac_alg, mac_length)              \
+    (((mac_alg) & ~(PSA_ALG_MAC_TRUNCATION_MASK |               \
+                    PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG)) |   \
+     ((mac_length) << PSA_MAC_TRUNCATION_OFFSET & PSA_ALG_MAC_TRUNCATION_MASK))
+
+/** Macro to build the base MAC algorithm corresponding to a truncated
+ * MAC algorithm.
+ *
+ * \param mac_alg       A MAC algorithm identifier (value of type
+ *                      #psa_algorithm_t such that #PSA_ALG_IS_MAC(\p alg)
+ *                      is true). This may be a truncated or untruncated
+ *                      MAC algorithm.
+ *
+ * \return              The corresponding base MAC algorithm.
+ * \return              Unspecified if \p alg is not a supported
+ *                      MAC algorithm.
+ */
+#define PSA_ALG_FULL_LENGTH_MAC(mac_alg)                        \
+    ((mac_alg) & ~(PSA_ALG_MAC_TRUNCATION_MASK |                \
+                   PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG))
+
+/** Length to which a MAC algorithm is truncated.
+ *
+ * \param mac_alg       A MAC algorithm identifier (value of type
+ *                      #psa_algorithm_t such that #PSA_ALG_IS_MAC(\p alg)
+ *                      is true).
+ *
+ * \return              Length of the truncated MAC in bytes.
+ * \return              0 if \p alg is a non-truncated MAC algorithm.
+ * \return              Unspecified if \p alg is not a supported
+ *                      MAC algorithm.
+ */
+#define PSA_MAC_TRUNCATED_LENGTH(mac_alg)                               \
+    (((mac_alg) & PSA_ALG_MAC_TRUNCATION_MASK) >> PSA_MAC_TRUNCATION_OFFSET)
+
+/** Macro to build a MAC minimum-MAC-length wildcard algorithm.
+ *
+ * A minimum-MAC-length MAC wildcard algorithm permits all MAC algorithms
+ * sharing the same base algorithm, and where the (potentially truncated) MAC
+ * length of the specific algorithm is equal to or larger then the wildcard
+ * algorithm's minimum MAC length.
+ *
+ * \note    When setting the minimum required MAC length to less than the
+ *          smallest MAC length allowed by the base algorithm, this effectively
+ *          becomes an 'any-MAC-length-allowed' policy for that base algorithm.
+ *
+ * \param mac_alg         A MAC algorithm identifier (value of type
+ *                        #psa_algorithm_t such that #PSA_ALG_IS_MAC(\p mac_alg)
+ *                        is true).
+ * \param min_mac_length  Desired minimum length of the message authentication
+ *                        code in bytes. This must be at most the untruncated
+ *                        length of the MAC and must be at least 1.
+ *
+ * \return                The corresponding MAC wildcard algorithm with the
+ *                        specified minimum length.
+ * \return                Unspecified if \p mac_alg is not a supported MAC
+ *                        algorithm or if \p min_mac_length is less than 1 or
+ *                        too large for the specified MAC algorithm.
+ */
+#define PSA_ALG_AT_LEAST_THIS_LENGTH_MAC(mac_alg, min_mac_length)   \
+    ( PSA_ALG_TRUNCATED_MAC(mac_alg, min_mac_length) |              \
+      PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG )
+
+#define PSA_ALG_CIPHER_MAC_BASE                 ((psa_algorithm_t)0x03c00000)
+/** The CBC-MAC construction over a block cipher
+ *
+ * \warning CBC-MAC is insecure in many cases.
+ * A more secure mode, such as #PSA_ALG_CMAC, is recommended.
+ */
+#define PSA_ALG_CBC_MAC                         ((psa_algorithm_t)0x03c00100)
+/** The CMAC construction over a block cipher */
+#define PSA_ALG_CMAC                            ((psa_algorithm_t)0x03c00200)
+
+/** Whether the specified algorithm is a MAC algorithm based on a block cipher.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a MAC algorithm based on a block cipher, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_BLOCK_CIPHER_MAC(alg)                                \
+    (((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_MAC_SUBCATEGORY_MASK)) == \
+     PSA_ALG_CIPHER_MAC_BASE)
+
+#define PSA_ALG_CIPHER_STREAM_FLAG              ((psa_algorithm_t)0x00800000)
+#define PSA_ALG_CIPHER_FROM_BLOCK_FLAG          ((psa_algorithm_t)0x00400000)
+
+/** Whether the specified algorithm is a stream cipher.
+ *
+ * A stream cipher is a symmetric cipher that encrypts or decrypts messages
+ * by applying a bitwise-xor with a stream of bytes that is generated
+ * from a key.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a stream cipher algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier or if it is not a symmetric cipher algorithm.
+ */
+#define PSA_ALG_IS_STREAM_CIPHER(alg)            \
+    (((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_CIPHER_STREAM_FLAG)) == \
+        (PSA_ALG_CATEGORY_CIPHER | PSA_ALG_CIPHER_STREAM_FLAG))
+
+/** The stream cipher mode of a stream cipher algorithm.
+ *
+ * The underlying stream cipher is determined by the key type.
+ * - To use ChaCha20, use a key type of #PSA_KEY_TYPE_CHACHA20.
+ * - To use ARC4, use a key type of #PSA_KEY_TYPE_ARC4.
+ */
+#define PSA_ALG_STREAM_CIPHER                   ((psa_algorithm_t)0x04800100)
+
+/** The CTR stream cipher mode.
+ *
+ * CTR is a stream cipher which is built from a block cipher.
+ * The underlying block cipher is determined by the key type.
+ * For example, to use AES-128-CTR, use this algorithm with
+ * a key of type #PSA_KEY_TYPE_AES and a length of 128 bits (16 bytes).
+ */
+#define PSA_ALG_CTR                             ((psa_algorithm_t)0x04c01000)
+
+/** The CFB stream cipher mode.
+ *
+ * The underlying block cipher is determined by the key type.
+ */
+#define PSA_ALG_CFB                             ((psa_algorithm_t)0x04c01100)
+
+/** The OFB stream cipher mode.
+ *
+ * The underlying block cipher is determined by the key type.
+ */
+#define PSA_ALG_OFB                             ((psa_algorithm_t)0x04c01200)
+
+/** The XTS cipher mode.
+ *
+ * XTS is a cipher mode which is built from a block cipher. It requires at
+ * least one full block of input, but beyond this minimum the input
+ * does not need to be a whole number of blocks.
+ */
+#define PSA_ALG_XTS                             ((psa_algorithm_t)0x0440ff00)
+
+/** The Electronic Code Book (ECB) mode of a block cipher, with no padding.
+ *
+ * \warning ECB mode does not protect the confidentiality of the encrypted data
+ * except in extremely narrow circumstances. It is recommended that applications
+ * only use ECB if they need to construct an operating mode that the
+ * implementation does not provide. Implementations are encouraged to provide
+ * the modes that applications need in preference to supporting direct access
+ * to ECB.
+ *
+ * The underlying block cipher is determined by the key type.
+ *
+ * This symmetric cipher mode can only be used with messages whose lengths are a
+ * multiple of the block size of the chosen block cipher.
+ *
+ * ECB mode does not accept an initialization vector (IV). When using a
+ * multi-part cipher operation with this algorithm, psa_cipher_generate_iv()
+ * and psa_cipher_set_iv() must not be called.
+ */
+#define PSA_ALG_ECB_NO_PADDING                  ((psa_algorithm_t)0x04404400)
+
+/** The CBC block cipher chaining mode, with no padding.
+ *
+ * The underlying block cipher is determined by the key type.
+ *
+ * This symmetric cipher mode can only be used with messages whose lengths
+ * are whole number of blocks for the chosen block cipher.
+ */
+#define PSA_ALG_CBC_NO_PADDING                  ((psa_algorithm_t)0x04404000)
+
+/** The CBC block cipher chaining mode with PKCS#7 padding.
+ *
+ * The underlying block cipher is determined by the key type.
+ *
+ * This is the padding method defined by PKCS#7 (RFC 2315) &sect;10.3.
+ */
+#define PSA_ALG_CBC_PKCS7                       ((psa_algorithm_t)0x04404100)
+
+#define PSA_ALG_AEAD_FROM_BLOCK_FLAG            ((psa_algorithm_t)0x00400000)
+
+/** Whether the specified algorithm is an AEAD mode on a block cipher.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is an AEAD algorithm which is an AEAD mode based on
+ *         a block cipher, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_AEAD_ON_BLOCK_CIPHER(alg)    \
+    (((alg) & (PSA_ALG_CATEGORY_MASK | PSA_ALG_AEAD_FROM_BLOCK_FLAG)) == \
+     (PSA_ALG_CATEGORY_AEAD | PSA_ALG_AEAD_FROM_BLOCK_FLAG))
+
+/** The CCM authenticated encryption algorithm.
+ *
+ * The underlying block cipher is determined by the key type.
+ */
+#define PSA_ALG_CCM                             ((psa_algorithm_t)0x05500100)
+
+/** The GCM authenticated encryption algorithm.
+ *
+ * The underlying block cipher is determined by the key type.
+ */
+#define PSA_ALG_GCM                             ((psa_algorithm_t)0x05500200)
+
+/** The Chacha20-Poly1305 AEAD algorithm.
+ *
+ * The ChaCha20_Poly1305 construction is defined in RFC 7539.
+ *
+ * Implementations must support 12-byte nonces, may support 8-byte nonces,
+ * and should reject other sizes.
+ *
+ * Implementations must support 16-byte tags and should reject other sizes.
+ */
+#define PSA_ALG_CHACHA20_POLY1305               ((psa_algorithm_t)0x05100500)
+
+/* In the encoding of a AEAD algorithm, the bits corresponding to
+ * PSA_ALG_AEAD_TAG_LENGTH_MASK encode the length of the AEAD tag.
+ * The constants for default lengths follow this encoding.
+ */
+#define PSA_ALG_AEAD_TAG_LENGTH_MASK            ((psa_algorithm_t)0x003f0000)
+#define PSA_AEAD_TAG_LENGTH_OFFSET 16
+
+/* In the encoding of an AEAD algorithm, the bit corresponding to
+ * #PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG encodes the fact that the algorithm
+ * is a wildcard algorithm. A key with such wildcard algorithm as permitted
+ * algorithm policy can be used with any algorithm corresponding to the
+ * same base class and having a tag length greater than or equal to the one
+ * encoded in #PSA_ALG_AEAD_TAG_LENGTH_MASK. */
+#define PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG  ((psa_algorithm_t)0x00008000)
+
+/** Macro to build a shortened AEAD algorithm.
+ *
+ * A shortened AEAD algorithm is similar to the corresponding AEAD
+ * algorithm, but has an authentication tag that consists of fewer bytes.
+ * Depending on the algorithm, the tag length may affect the calculation
+ * of the ciphertext.
+ *
+ * \param aead_alg      An AEAD algorithm identifier (value of type
+ *                      #psa_algorithm_t such that #PSA_ALG_IS_AEAD(\p alg)
+ *                      is true).
+ * \param tag_length    Desired length of the authentication tag in bytes.
+ *
+ * \return              The corresponding AEAD algorithm with the specified
+ *                      length.
+ * \return              Unspecified if \p alg is not a supported
+ *                      AEAD algorithm or if \p tag_length is not valid
+ *                      for the specified AEAD algorithm.
+ */
+#define PSA_ALG_AEAD_WITH_SHORTENED_TAG(aead_alg, tag_length)           \
+    (((aead_alg) & ~(PSA_ALG_AEAD_TAG_LENGTH_MASK |                     \
+                     PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG)) |         \
+     ((tag_length) << PSA_AEAD_TAG_LENGTH_OFFSET &                      \
+      PSA_ALG_AEAD_TAG_LENGTH_MASK))
+
+/** Retrieve the tag length of a specified AEAD algorithm
+ *
+ * \param aead_alg      An AEAD algorithm identifier (value of type
+ *                      #psa_algorithm_t such that #PSA_ALG_IS_AEAD(\p alg)
+ *                      is true).
+ *
+ * \return              The tag length specified by the input algorithm.
+ * \return              Unspecified if \p alg is not a supported
+ *                      AEAD algorithm or if \p tag_length is not valid
+ *                      for the specified AEAD algorithm.
+ */
+#define PSA_ALG_AEAD_GET_TAG_LENGTH(aead_alg)                           \
+    (((aead_alg) & PSA_ALG_AEAD_TAG_LENGTH_MASK) >>                     \
+      PSA_AEAD_TAG_LENGTH_OFFSET )
+
+/** Calculate the corresponding AEAD algorithm with the default tag length.
+ *
+ * \param aead_alg      An AEAD algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_AEAD(\p alg) is true).
+ *
+ * \return              The corresponding AEAD algorithm with the default
+ *                      tag length for that algorithm.
+ */
+#define PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG(aead_alg)                   \
+    (                                                                    \
+        PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG_CASE(aead_alg, PSA_ALG_CCM) \
+        PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG_CASE(aead_alg, PSA_ALG_GCM) \
+        PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG_CASE(aead_alg, PSA_ALG_CHACHA20_POLY1305) \
+        0)
+#define PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG_CASE(aead_alg, ref)         \
+    PSA_ALG_AEAD_WITH_SHORTENED_TAG(aead_alg, 0) ==                      \
+    PSA_ALG_AEAD_WITH_SHORTENED_TAG(ref, 0) ?                            \
+    ref :
+
+/** Macro to build an AEAD minimum-tag-length wildcard algorithm.
+ *
+ * A minimum-tag-length AEAD wildcard algorithm permits all AEAD algorithms
+ * sharing the same base algorithm, and where the tag length of the specific
+ * algorithm is equal to or larger then the minimum tag length specified by the
+ * wildcard algorithm.
+ *
+ * \note    When setting the minimum required tag length to less than the
+ *          smallest tag length allowed by the base algorithm, this effectively
+ *          becomes an 'any-tag-length-allowed' policy for that base algorithm.
+ *
+ * \param aead_alg        An AEAD algorithm identifier (value of type
+ *                        #psa_algorithm_t such that
+ *                        #PSA_ALG_IS_AEAD(\p aead_alg) is true).
+ * \param min_tag_length  Desired minimum length of the authentication tag in
+ *                        bytes. This must be at least 1 and at most the largest
+ *                        allowed tag length of the algorithm.
+ *
+ * \return                The corresponding AEAD wildcard algorithm with the
+ *                        specified minimum length.
+ * \return                Unspecified if \p aead_alg is not a supported
+ *                        AEAD algorithm or if \p min_tag_length is less than 1
+ *                        or too large for the specified AEAD algorithm.
+ */
+#define PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG(aead_alg, min_tag_length) \
+    ( PSA_ALG_AEAD_WITH_SHORTENED_TAG(aead_alg, min_tag_length) |            \
+      PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG )
+
+#define PSA_ALG_RSA_PKCS1V15_SIGN_BASE          ((psa_algorithm_t)0x06000200)
+/** RSA PKCS#1 v1.5 signature with hashing.
+ *
+ * This is the signature scheme defined by RFC 8017
+ * (PKCS#1: RSA Cryptography Specifications) under the name
+ * RSASSA-PKCS1-v1_5.
+ *
+ * \param hash_alg      A hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true).
+ *                      This includes #PSA_ALG_ANY_HASH
+ *                      when specifying the algorithm in a usage policy.
+ *
+ * \return              The corresponding RSA PKCS#1 v1.5 signature algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_RSA_PKCS1V15_SIGN(hash_alg)                             \
+    (PSA_ALG_RSA_PKCS1V15_SIGN_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+/** Raw PKCS#1 v1.5 signature.
+ *
+ * The input to this algorithm is the DigestInfo structure used by
+ * RFC 8017 (PKCS#1: RSA Cryptography Specifications), &sect;9.2
+ * steps 3&ndash;6.
+ */
+#define PSA_ALG_RSA_PKCS1V15_SIGN_RAW PSA_ALG_RSA_PKCS1V15_SIGN_BASE
+#define PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg)                               \
+    (((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_RSA_PKCS1V15_SIGN_BASE)
+
+#define PSA_ALG_RSA_PSS_BASE               ((psa_algorithm_t)0x06000300)
+/** RSA PSS signature with hashing.
+ *
+ * This is the signature scheme defined by RFC 8017
+ * (PKCS#1: RSA Cryptography Specifications) under the name
+ * RSASSA-PSS, with the message generation function MGF1, and with
+ * a salt length equal to the length of the hash. The specified
+ * hash algorithm is used to hash the input message, to create the
+ * salted hash, and for the mask generation.
+ *
+ * \param hash_alg      A hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true).
+ *                      This includes #PSA_ALG_ANY_HASH
+ *                      when specifying the algorithm in a usage policy.
+ *
+ * \return              The corresponding RSA PSS signature algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_RSA_PSS(hash_alg)                               \
+    (PSA_ALG_RSA_PSS_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+#define PSA_ALG_IS_RSA_PSS(alg)                                 \
+    (((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_RSA_PSS_BASE)
+
+#define PSA_ALG_ECDSA_BASE                      ((psa_algorithm_t)0x06000600)
+/** ECDSA signature with hashing.
+ *
+ * This is the ECDSA signature scheme defined by ANSI X9.62,
+ * with a random per-message secret number (*k*).
+ *
+ * The representation of the signature as a byte string consists of
+ * the concatentation of the signature values *r* and *s*. Each of
+ * *r* and *s* is encoded as an *N*-octet string, where *N* is the length
+ * of the base point of the curve in octets. Each value is represented
+ * in big-endian order (most significant octet first).
+ *
+ * \param hash_alg      A hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true).
+ *                      This includes #PSA_ALG_ANY_HASH
+ *                      when specifying the algorithm in a usage policy.
+ *
+ * \return              The corresponding ECDSA signature algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_ECDSA(hash_alg)                                 \
+    (PSA_ALG_ECDSA_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+/** ECDSA signature without hashing.
+ *
+ * This is the same signature scheme as #PSA_ALG_ECDSA(), but
+ * without specifying a hash algorithm. This algorithm may only be
+ * used to sign or verify a sequence of bytes that should be an
+ * already-calculated hash. Note that the input is padded with
+ * zeros on the left or truncated on the left as required to fit
+ * the curve size.
+ */
+#define PSA_ALG_ECDSA_ANY PSA_ALG_ECDSA_BASE
+#define PSA_ALG_DETERMINISTIC_ECDSA_BASE        ((psa_algorithm_t)0x06000700)
+/** Deterministic ECDSA signature with hashing.
+ *
+ * This is the deterministic ECDSA signature scheme defined by RFC 6979.
+ *
+ * The representation of a signature is the same as with #PSA_ALG_ECDSA().
+ *
+ * Note that when this algorithm is used for verification, signatures
+ * made with randomized ECDSA (#PSA_ALG_ECDSA(\p hash_alg)) with the
+ * same private key are accepted. In other words,
+ * #PSA_ALG_DETERMINISTIC_ECDSA(\p hash_alg) differs from
+ * #PSA_ALG_ECDSA(\p hash_alg) only for signature, not for verification.
+ *
+ * \param hash_alg      A hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true).
+ *                      This includes #PSA_ALG_ANY_HASH
+ *                      when specifying the algorithm in a usage policy.
+ *
+ * \return              The corresponding deterministic ECDSA signature
+ *                      algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_DETERMINISTIC_ECDSA(hash_alg)                           \
+    (PSA_ALG_DETERMINISTIC_ECDSA_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+#define PSA_ALG_ECDSA_DETERMINISTIC_FLAG        ((psa_algorithm_t)0x00000100)
+#define PSA_ALG_IS_ECDSA(alg)                                           \
+    (((alg) & ~PSA_ALG_HASH_MASK & ~PSA_ALG_ECDSA_DETERMINISTIC_FLAG) ==  \
+     PSA_ALG_ECDSA_BASE)
+#define PSA_ALG_ECDSA_IS_DETERMINISTIC(alg)             \
+    (((alg) & PSA_ALG_ECDSA_DETERMINISTIC_FLAG) != 0)
+#define PSA_ALG_IS_DETERMINISTIC_ECDSA(alg)                             \
+    (PSA_ALG_IS_ECDSA(alg) && PSA_ALG_ECDSA_IS_DETERMINISTIC(alg))
+#define PSA_ALG_IS_RANDOMIZED_ECDSA(alg)                                \
+    (PSA_ALG_IS_ECDSA(alg) && !PSA_ALG_ECDSA_IS_DETERMINISTIC(alg))
+
+/** Whether the specified algorithm is a hash-and-sign algorithm.
+ *
+ * Hash-and-sign algorithms are asymmetric (public-key) signature algorithms
+ * structured in two parts: first the calculation of a hash in a way that
+ * does not depend on the key, then the calculation of a signature from the
+ * hash value and the key.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a hash-and-sign algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_HASH_AND_SIGN(alg)                                   \
+    (PSA_ALG_IS_RSA_PSS(alg) || PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) ||    \
+     PSA_ALG_IS_ECDSA(alg))
+
+/** Get the hash used by a hash-and-sign signature algorithm.
+ *
+ * A hash-and-sign algorithm is a signature algorithm which is
+ * composed of two phases: first a hashing phase which does not use
+ * the key and produces a hash of the input message, then a signing
+ * phase which only uses the hash and the key and not the message
+ * itself.
+ *
+ * \param alg   A signature algorithm (\c PSA_ALG_XXX value such that
+ *              #PSA_ALG_IS_SIGN(\p alg) is true).
+ *
+ * \return      The underlying hash algorithm if \p alg is a hash-and-sign
+ *              algorithm.
+ * \return      0 if \p alg is a signature algorithm that does not
+ *              follow the hash-and-sign structure.
+ * \return      Unspecified if \p alg is not a signature algorithm or
+ *              if it is not supported by the implementation.
+ */
+#define PSA_ALG_SIGN_GET_HASH(alg)                                     \
+    (PSA_ALG_IS_HASH_AND_SIGN(alg) ?                                   \
+     ((alg) & PSA_ALG_HASH_MASK) == 0 ? /*"raw" algorithm*/ 0 :        \
+     ((alg) & PSA_ALG_HASH_MASK) | PSA_ALG_CATEGORY_HASH :             \
+     0)
+
+/** RSA PKCS#1 v1.5 encryption.
+ */
+#define PSA_ALG_RSA_PKCS1V15_CRYPT              ((psa_algorithm_t)0x07000200)
+
+#define PSA_ALG_RSA_OAEP_BASE                   ((psa_algorithm_t)0x07000300)
+/** RSA OAEP encryption.
+ *
+ * This is the encryption scheme defined by RFC 8017
+ * (PKCS#1: RSA Cryptography Specifications) under the name
+ * RSAES-OAEP, with the message generation function MGF1.
+ *
+ * \param hash_alg      The hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true) to use
+ *                      for MGF1.
+ *
+ * \return              The corresponding RSA OAEP encryption algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_RSA_OAEP(hash_alg)                              \
+    (PSA_ALG_RSA_OAEP_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+#define PSA_ALG_IS_RSA_OAEP(alg)                                \
+    (((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_RSA_OAEP_BASE)
+#define PSA_ALG_RSA_OAEP_GET_HASH(alg)                          \
+    (PSA_ALG_IS_RSA_OAEP(alg) ?                                 \
+     ((alg) & PSA_ALG_HASH_MASK) | PSA_ALG_CATEGORY_HASH :      \
+     0)
+
+#define PSA_ALG_HKDF_BASE                       ((psa_algorithm_t)0x08000100)
+/** Macro to build an HKDF algorithm.
+ *
+ * For example, `PSA_ALG_HKDF(PSA_ALG_SHA256)` is HKDF using HMAC-SHA-256.
+ *
+ * This key derivation algorithm uses the following inputs:
+ * - #PSA_KEY_DERIVATION_INPUT_SALT is the salt used in the "extract" step.
+ *   It is optional; if omitted, the derivation uses an empty salt.
+ * - #PSA_KEY_DERIVATION_INPUT_SECRET is the secret key used in the "extract" step.
+ * - #PSA_KEY_DERIVATION_INPUT_INFO is the info string used in the "expand" step.
+ * You must pass #PSA_KEY_DERIVATION_INPUT_SALT before #PSA_KEY_DERIVATION_INPUT_SECRET.
+ * You may pass #PSA_KEY_DERIVATION_INPUT_INFO at any time after steup and before
+ * starting to generate output.
+ *
+ * \param hash_alg      A hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true).
+ *
+ * \return              The corresponding HKDF algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_HKDF(hash_alg)                                  \
+    (PSA_ALG_HKDF_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+/** Whether the specified algorithm is an HKDF algorithm.
+ *
+ * HKDF is a family of key derivation algorithms that are based on a hash
+ * function and the HMAC construction.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \c alg is an HKDF algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \c alg is not a supported
+ *         key derivation algorithm identifier.
+ */
+#define PSA_ALG_IS_HKDF(alg)                            \
+    (((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_HKDF_BASE)
+#define PSA_ALG_HKDF_GET_HASH(hkdf_alg)                         \
+    (PSA_ALG_CATEGORY_HASH | ((hkdf_alg) & PSA_ALG_HASH_MASK))
+
+#define PSA_ALG_TLS12_PRF_BASE                  ((psa_algorithm_t)0x08000200)
+/** Macro to build a TLS-1.2 PRF algorithm.
+ *
+ * TLS 1.2 uses a custom pseudorandom function (PRF) for key schedule,
+ * specified in Section 5 of RFC 5246. It is based on HMAC and can be
+ * used with either SHA-256 or SHA-384.
+ *
+ * This key derivation algorithm uses the following inputs, which must be
+ * passed in the order given here:
+ * - #PSA_KEY_DERIVATION_INPUT_SEED is the seed.
+ * - #PSA_KEY_DERIVATION_INPUT_SECRET is the secret key.
+ * - #PSA_KEY_DERIVATION_INPUT_LABEL is the label.
+ *
+ * For the application to TLS-1.2 key expansion, the seed is the
+ * concatenation of ServerHello.Random + ClientHello.Random,
+ * and the label is "key expansion".
+ *
+ * For example, `PSA_ALG_TLS12_PRF(PSA_ALG_SHA256)` represents the
+ * TLS 1.2 PRF using HMAC-SHA-256.
+ *
+ * \param hash_alg      A hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true).
+ *
+ * \return              The corresponding TLS-1.2 PRF algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_TLS12_PRF(hash_alg)                                  \
+    (PSA_ALG_TLS12_PRF_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+
+/** Whether the specified algorithm is a TLS-1.2 PRF algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \c alg is a TLS-1.2 PRF algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \c alg is not a supported
+ *         key derivation algorithm identifier.
+ */
+#define PSA_ALG_IS_TLS12_PRF(alg)                                    \
+    (((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_TLS12_PRF_BASE)
+#define PSA_ALG_TLS12_PRF_GET_HASH(hkdf_alg)                         \
+    (PSA_ALG_CATEGORY_HASH | ((hkdf_alg) & PSA_ALG_HASH_MASK))
+
+#define PSA_ALG_TLS12_PSK_TO_MS_BASE            ((psa_algorithm_t)0x08000300)
+/** Macro to build a TLS-1.2 PSK-to-MasterSecret algorithm.
+ *
+ * In a pure-PSK handshake in TLS 1.2, the master secret is derived
+ * from the PreSharedKey (PSK) through the application of padding
+ * (RFC 4279, Section 2) and the TLS-1.2 PRF (RFC 5246, Section 5).
+ * The latter is based on HMAC and can be used with either SHA-256
+ * or SHA-384.
+ *
+ * This key derivation algorithm uses the following inputs, which must be
+ * passed in the order given here:
+ * - #PSA_KEY_DERIVATION_INPUT_SEED is the seed.
+ * - #PSA_KEY_DERIVATION_INPUT_SECRET is the secret key.
+ * - #PSA_KEY_DERIVATION_INPUT_LABEL is the label.
+ *
+ * For the application to TLS-1.2, the seed (which is
+ * forwarded to the TLS-1.2 PRF) is the concatenation of the
+ * ClientHello.Random + ServerHello.Random,
+ * and the label is "master secret" or "extended master secret".
+ *
+ * For example, `PSA_ALG_TLS12_PSK_TO_MS(PSA_ALG_SHA256)` represents the
+ * TLS-1.2 PSK to MasterSecret derivation PRF using HMAC-SHA-256.
+ *
+ * \param hash_alg      A hash algorithm (\c PSA_ALG_XXX value such that
+ *                      #PSA_ALG_IS_HASH(\p hash_alg) is true).
+ *
+ * \return              The corresponding TLS-1.2 PSK to MS algorithm.
+ * \return              Unspecified if \p hash_alg is not a supported
+ *                      hash algorithm.
+ */
+#define PSA_ALG_TLS12_PSK_TO_MS(hash_alg)                                  \
+    (PSA_ALG_TLS12_PSK_TO_MS_BASE | ((hash_alg) & PSA_ALG_HASH_MASK))
+
+/** Whether the specified algorithm is a TLS-1.2 PSK to MS algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \c alg is a TLS-1.2 PSK to MS algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \c alg is not a supported
+ *         key derivation algorithm identifier.
+ */
+#define PSA_ALG_IS_TLS12_PSK_TO_MS(alg)                                    \
+    (((alg) & ~PSA_ALG_HASH_MASK) == PSA_ALG_TLS12_PSK_TO_MS_BASE)
+#define PSA_ALG_TLS12_PSK_TO_MS_GET_HASH(hkdf_alg)                         \
+    (PSA_ALG_CATEGORY_HASH | ((hkdf_alg) & PSA_ALG_HASH_MASK))
+
+#define PSA_ALG_KEY_DERIVATION_MASK             ((psa_algorithm_t)0xfe00ffff)
+#define PSA_ALG_KEY_AGREEMENT_MASK              ((psa_algorithm_t)0xffff0000)
+
+/** Macro to build a combined algorithm that chains a key agreement with
+ * a key derivation.
+ *
+ * \param ka_alg        A key agreement algorithm (\c PSA_ALG_XXX value such
+ *                      that #PSA_ALG_IS_KEY_AGREEMENT(\p ka_alg) is true).
+ * \param kdf_alg       A key derivation algorithm (\c PSA_ALG_XXX value such
+ *                      that #PSA_ALG_IS_KEY_DERIVATION(\p kdf_alg) is true).
+ *
+ * \return              The corresponding key agreement and derivation
+ *                      algorithm.
+ * \return              Unspecified if \p ka_alg is not a supported
+ *                      key agreement algorithm or \p kdf_alg is not a
+ *                      supported key derivation algorithm.
+ */
+#define PSA_ALG_KEY_AGREEMENT(ka_alg, kdf_alg)  \
+    ((ka_alg) | (kdf_alg))
+
+#define PSA_ALG_KEY_AGREEMENT_GET_KDF(alg)                              \
+    (((alg) & PSA_ALG_KEY_DERIVATION_MASK) | PSA_ALG_CATEGORY_KEY_DERIVATION)
+
+#define PSA_ALG_KEY_AGREEMENT_GET_BASE(alg)                             \
+    (((alg) & PSA_ALG_KEY_AGREEMENT_MASK) | PSA_ALG_CATEGORY_KEY_AGREEMENT)
+
+/** Whether the specified algorithm is a raw key agreement algorithm.
+ *
+ * A raw key agreement algorithm is one that does not specify
+ * a key derivation function.
+ * Usually, raw key agreement algorithms are constructed directly with
+ * a \c PSA_ALG_xxx macro while non-raw key agreement algorithms are
+ * constructed with #PSA_ALG_KEY_AGREEMENT().
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \p alg is a raw key agreement algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \p alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_RAW_KEY_AGREEMENT(alg)                               \
+    (PSA_ALG_IS_KEY_AGREEMENT(alg) &&                                   \
+     PSA_ALG_KEY_AGREEMENT_GET_KDF(alg) == PSA_ALG_CATEGORY_KEY_DERIVATION)
+
+#define PSA_ALG_IS_KEY_DERIVATION_OR_AGREEMENT(alg)     \
+    ((PSA_ALG_IS_KEY_DERIVATION(alg) || PSA_ALG_IS_KEY_AGREEMENT(alg)))
+
+/** The finite-field Diffie-Hellman (DH) key agreement algorithm.
+ *
+ * The shared secret produced by key agreement is
+ * `g^{ab}` in big-endian format.
+ * It is `ceiling(m / 8)` bytes long where `m` is the size of the prime `p`
+ * in bits.
+ */
+#define PSA_ALG_FFDH                            ((psa_algorithm_t)0x09010000)
+
+/** Whether the specified algorithm is a finite field Diffie-Hellman algorithm.
+ *
+ * This includes the raw finite field Diffie-Hellman algorithm as well as
+ * finite-field Diffie-Hellman followed by any supporter key derivation
+ * algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \c alg is a finite field Diffie-Hellman algorithm, 0 otherwise.
+ *         This macro may return either 0 or 1 if \c alg is not a supported
+ *         key agreement algorithm identifier.
+ */
+#define PSA_ALG_IS_FFDH(alg) \
+    (PSA_ALG_KEY_AGREEMENT_GET_BASE(alg) == PSA_ALG_FFDH)
+
+/** The elliptic curve Diffie-Hellman (ECDH) key agreement algorithm.
+ *
+ * The shared secret produced by key agreement is the x-coordinate of
+ * the shared secret point. It is always `ceiling(m / 8)` bytes long where
+ * `m` is the bit size associated with the curve, i.e. the bit size of the
+ * order of the curve's coordinate field. When `m` is not a multiple of 8,
+ * the byte containing the most significant bit of the shared secret
+ * is padded with zero bits. The byte order is either little-endian
+ * or big-endian depending on the curve type.
+ *
+ * - For Montgomery curves (curve types `PSA_ECC_FAMILY_CURVEXXX`),
+ *   the shared secret is the x-coordinate of `d_A Q_B = d_B Q_A`
+ *   in little-endian byte order.
+ *   The bit size is 448 for Curve448 and 255 for Curve25519.
+ * - For Weierstrass curves over prime fields (curve types
+ *   `PSA_ECC_FAMILY_SECPXXX` and `PSA_ECC_FAMILY_BRAINPOOL_PXXX`),
+ *   the shared secret is the x-coordinate of `d_A Q_B = d_B Q_A`
+ *   in big-endian byte order.
+ *   The bit size is `m = ceiling(log_2(p))` for the field `F_p`.
+ * - For Weierstrass curves over binary fields (curve types
+ *   `PSA_ECC_FAMILY_SECTXXX`),
+ *   the shared secret is the x-coordinate of `d_A Q_B = d_B Q_A`
+ *   in big-endian byte order.
+ *   The bit size is `m` for the field `F_{2^m}`.
+ */
+#define PSA_ALG_ECDH                            ((psa_algorithm_t)0x09020000)
+
+/** Whether the specified algorithm is an elliptic curve Diffie-Hellman
+ * algorithm.
+ *
+ * This includes the raw elliptic curve Diffie-Hellman algorithm as well as
+ * elliptic curve Diffie-Hellman followed by any supporter key derivation
+ * algorithm.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \c alg is an elliptic curve Diffie-Hellman algorithm,
+ *         0 otherwise.
+ *         This macro may return either 0 or 1 if \c alg is not a supported
+ *         key agreement algorithm identifier.
+ */
+#define PSA_ALG_IS_ECDH(alg) \
+    (PSA_ALG_KEY_AGREEMENT_GET_BASE(alg) == PSA_ALG_ECDH)
+
+/** Whether the specified algorithm encoding is a wildcard.
+ *
+ * Wildcard values may only be used to set the usage algorithm field in
+ * a policy, not to perform an operation.
+ *
+ * \param alg An algorithm identifier (value of type #psa_algorithm_t).
+ *
+ * \return 1 if \c alg is a wildcard algorithm encoding.
+ * \return 0 if \c alg is a non-wildcard algorithm encoding (suitable for
+ *         an operation).
+ * \return This macro may return either 0 or 1 if \c alg is not a supported
+ *         algorithm identifier.
+ */
+#define PSA_ALG_IS_WILDCARD(alg)                            \
+    (PSA_ALG_IS_HASH_AND_SIGN(alg) ?                        \
+     PSA_ALG_SIGN_GET_HASH(alg) == PSA_ALG_ANY_HASH :       \
+     PSA_ALG_IS_MAC(alg) ?                                  \
+     (alg & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG) != 0 :   \
+     PSA_ALG_IS_AEAD(alg) ?                                 \
+     (alg & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG) != 0 :  \
+     (alg) == PSA_ALG_ANY_HASH)
+
+/**@}*/
+
+/** \defgroup key_lifetimes Key lifetimes
+ * @{
+ */
+
+/** The default lifetime for volatile keys.
+ *
+ * A volatile key only exists as long as the identifier to it is not destroyed.
+ * The key material is guaranteed to be erased on a power reset.
+ *
+ * A key with this lifetime is typically stored in the RAM area of the
+ * PSA Crypto subsystem. However this is an implementation choice.
+ * If an implementation stores data about the key in a non-volatile memory,
+ * it must release all the resources associated with the key and erase the
+ * key material if the calling application terminates.
+ */
+#define PSA_KEY_LIFETIME_VOLATILE               ((psa_key_lifetime_t)0x00000000)
+
+/** The default lifetime for persistent keys.
+ *
+ * A persistent key remains in storage until it is explicitly destroyed or
+ * until the corresponding storage area is wiped. This specification does
+ * not define any mechanism to wipe a storage area, but integrations may
+ * provide their own mechanism (for example to perform a factory reset,
+ * to prepare for device refurbishment, or to uninstall an application).
+ *
+ * This lifetime value is the default storage area for the calling
+ * application. Integrations of Mbed TLS may support other persistent lifetimes.
+ * See ::psa_key_lifetime_t for more information.
+ */
+#define PSA_KEY_LIFETIME_PERSISTENT             ((psa_key_lifetime_t)0x00000001)
+
+/** The persistence level of volatile keys.
+ *
+ * See ::psa_key_persistence_t for more information.
+ */
+#define PSA_KEY_PERSISTENCE_VOLATILE            ((psa_key_persistence_t)0x00)
+
+/** The default persistence level for persistent keys.
+ *
+ * See ::psa_key_persistence_t for more information.
+ */
+#define PSA_KEY_PERSISTENCE_DEFAULT             ((psa_key_persistence_t)0x01)
+
+/** A persistence level indicating that a key is never destroyed.
+ *
+ * See ::psa_key_persistence_t for more information.
+ */
+#define PSA_KEY_PERSISTENCE_READ_ONLY           ((psa_key_persistence_t)0xff)
+
+#define PSA_KEY_LIFETIME_GET_PERSISTENCE(lifetime)      \
+    ((psa_key_persistence_t)((lifetime) & 0x000000ff))
+
+#define PSA_KEY_LIFETIME_GET_LOCATION(lifetime)      \
+    ((psa_key_location_t)((lifetime) >> 8))
+
+/** Whether a key lifetime indicates that the key is volatile.
+ *
+ * A volatile key is automatically destroyed by the implementation when
+ * the application instance terminates. In particular, a volatile key
+ * is automatically destroyed on a power reset of the device.
+ *
+ * A key that is not volatile is persistent. Persistent keys are
+ * preserved until the application explicitly destroys them or until an
+ * implementation-specific device management event occurs (for example,
+ * a factory reset).
+ *
+ * \param lifetime      The lifetime value to query (value of type
+ *                      ::psa_key_lifetime_t).
+ *
+ * \return \c 1 if the key is volatile, otherwise \c 0.
+ */
+#define PSA_KEY_LIFETIME_IS_VOLATILE(lifetime)  \
+    (PSA_KEY_LIFETIME_GET_PERSISTENCE(lifetime) == \
+     PSA_KEY_PERSISTENCE_VOLATILE)
+
+/** Construct a lifetime from a persistence level and a location.
+ *
+ * \param persistence   The persistence level
+ *                      (value of type ::psa_key_persistence_t).
+ * \param location      The location indicator
+ *                      (value of type ::psa_key_location_t).
+ *
+ * \return The constructed lifetime value.
+ */
+#define PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(persistence, location) \
+    ((location) << 8 | (persistence))
+
+/** The local storage area for persistent keys.
+ *
+ * This storage area is available on all systems that can store persistent
+ * keys without delegating the storage to a third-party cryptoprocessor.
+ *
+ * See ::psa_key_location_t for more information.
+ */
+#define PSA_KEY_LOCATION_LOCAL_STORAGE          ((psa_key_location_t)0x000000)
+
+#define PSA_KEY_LOCATION_VENDOR_FLAG            ((psa_key_location_t)0x800000)
+
+/** The minimum value for a key identifier chosen by the application.
+ */
+#define PSA_KEY_ID_USER_MIN                     ((psa_key_id_t)0x00000001)
+/** The maximum value for a key identifier chosen by the application.
+ */
+#define PSA_KEY_ID_USER_MAX                     ((psa_key_id_t)0x3fffffff)
+/** The minimum value for a key identifier chosen by the implementation.
+ */
+#define PSA_KEY_ID_VENDOR_MIN                   ((psa_key_id_t)0x40000000)
+/** The maximum value for a key identifier chosen by the implementation.
+ */
+#define PSA_KEY_ID_VENDOR_MAX                   ((psa_key_id_t)0x7fffffff)
+
+/**@}*/
+
+/** \defgroup policy Key policies
+ * @{
+ */
+
+/** Whether the key may be exported.
+ *
+ * A public key or the public part of a key pair may always be exported
+ * regardless of the value of this permission flag.
+ *
+ * If a key does not have export permission, implementations shall not
+ * allow the key to be exported in plain form from the cryptoprocessor,
+ * whether through psa_export_key() or through a proprietary interface.
+ * The key may however be exportable in a wrapped form, i.e. in a form
+ * where it is encrypted by another key.
+ */
+#define PSA_KEY_USAGE_EXPORT                    ((psa_key_usage_t)0x00000001)
+
+/** Whether the key may be copied.
+ *
+ * This flag allows the use of psa_copy_key() to make a copy of the key
+ * with the same policy or a more restrictive policy.
+ *
+ * For lifetimes for which the key is located in a secure element which
+ * enforce the non-exportability of keys, copying a key outside the secure
+ * element also requires the usage flag #PSA_KEY_USAGE_EXPORT.
+ * Copying the key inside the secure element is permitted with just
+ * #PSA_KEY_USAGE_COPY if the secure element supports it.
+ * For keys with the lifetime #PSA_KEY_LIFETIME_VOLATILE or
+ * #PSA_KEY_LIFETIME_PERSISTENT, the usage flag #PSA_KEY_USAGE_COPY
+ * is sufficient to permit the copy.
+ */
+#define PSA_KEY_USAGE_COPY                      ((psa_key_usage_t)0x00000002)
+
+/** Whether the key may be used to encrypt a message.
+ *
+ * This flag allows the key to be used for a symmetric encryption operation,
+ * for an AEAD encryption-and-authentication operation,
+ * or for an asymmetric encryption operation,
+ * if otherwise permitted by the key's type and policy.
+ *
+ * For a key pair, this concerns the public key.
+ */
+#define PSA_KEY_USAGE_ENCRYPT                   ((psa_key_usage_t)0x00000100)
+
+/** Whether the key may be used to decrypt a message.
+ *
+ * This flag allows the key to be used for a symmetric decryption operation,
+ * for an AEAD decryption-and-verification operation,
+ * or for an asymmetric decryption operation,
+ * if otherwise permitted by the key's type and policy.
+ *
+ * For a key pair, this concerns the private key.
+ */
+#define PSA_KEY_USAGE_DECRYPT                   ((psa_key_usage_t)0x00000200)
+
+/** Whether the key may be used to sign a message.
+ *
+ * This flag allows the key to be used for a MAC calculation operation
+ * or for an asymmetric signature operation,
+ * if otherwise permitted by the key's type and policy.
+ *
+ * For a key pair, this concerns the private key.
+ */
+#define PSA_KEY_USAGE_SIGN_HASH                 ((psa_key_usage_t)0x00001000)
+
+/** Whether the key may be used to verify a message signature.
+ *
+ * This flag allows the key to be used for a MAC verification operation
+ * or for an asymmetric signature verification operation,
+ * if otherwise permitted by by the key's type and policy.
+ *
+ * For a key pair, this concerns the public key.
+ */
+#define PSA_KEY_USAGE_VERIFY_HASH               ((psa_key_usage_t)0x00002000)
+
+/** Whether the key may be used to derive other keys.
+ */
+#define PSA_KEY_USAGE_DERIVE                    ((psa_key_usage_t)0x00004000)
+
+/**@}*/
+
+/** \defgroup derivation Key derivation
+ * @{
+ */
+
+/** A secret input for key derivation.
+ *
+ * This should be a key of type #PSA_KEY_TYPE_DERIVE
+ * (passed to psa_key_derivation_input_key())
+ * or the shared secret resulting from a key agreement
+ * (obtained via psa_key_derivation_key_agreement()).
+ *
+ * The secret can also be a direct input (passed to
+ * key_derivation_input_bytes()). In this case, the derivation operation
+ * may not be used to derive keys: the operation will only allow
+ * psa_key_derivation_output_bytes(), not psa_key_derivation_output_key().
+ */
+#define PSA_KEY_DERIVATION_INPUT_SECRET     ((psa_key_derivation_step_t)0x0101)
+
+/** A label for key derivation.
+ *
+ * This should be a direct input.
+ * It can also be a key of type #PSA_KEY_TYPE_RAW_DATA.
+ */
+#define PSA_KEY_DERIVATION_INPUT_LABEL      ((psa_key_derivation_step_t)0x0201)
+
+/** A salt for key derivation.
+ *
+ * This should be a direct input.
+ * It can also be a key of type #PSA_KEY_TYPE_RAW_DATA.
+ */
+#define PSA_KEY_DERIVATION_INPUT_SALT       ((psa_key_derivation_step_t)0x0202)
+
+/** An information string for key derivation.
+ *
+ * This should be a direct input.
+ * It can also be a key of type #PSA_KEY_TYPE_RAW_DATA.
+ */
+#define PSA_KEY_DERIVATION_INPUT_INFO       ((psa_key_derivation_step_t)0x0203)
+
+/** A seed for key derivation.
+ *
+ * This should be a direct input.
+ * It can also be a key of type #PSA_KEY_TYPE_RAW_DATA.
+ */
+#define PSA_KEY_DERIVATION_INPUT_SEED       ((psa_key_derivation_step_t)0x0204)
+
+/**@}*/
+
+#endif /* PSA_CRYPTO_VALUES_H */
diff --git a/components/service/crypto/provider/mbedcrypto/component.cmake b/components/service/crypto/provider/mbedcrypto/component.cmake
index e9340ec..0df1138 100644
--- a/components/service/crypto/provider/mbedcrypto/component.cmake
+++ b/components/service/crypto/provider/mbedcrypto/component.cmake
@@ -26,6 +26,6 @@
 	CACHE STRING "Configuration file for Mbed TLS" FORCE)
 
 set(MBEDTLS_EXTRA_INCLUDES
-	"${TS_ROOT}/components/service/common"
-	"${TS_ROOT}/components/service/secure_storage/client"
+	"${TS_ROOT}/components/service/common/include"
+	"${TS_ROOT}/components/service/secure_storage/include"
 	CACHE STRING "PSA ITS for Mbed TLS" FORCE)
diff --git a/components/service/crypto/test/service/crypto_service_scenarios.cpp b/components/service/crypto/test/service/crypto_service_scenarios.cpp
index e0fa43e..e20b6be 100644
--- a/components/service/crypto/test/service/crypto_service_scenarios.cpp
+++ b/components/service/crypto/test/service/crypto_service_scenarios.cpp
@@ -265,7 +265,7 @@
 {
     psa_status_t status;
     psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
-    psa_key_handle_t key_handle;
+    psa_key_id_t key_id;
 
     psa_set_key_id(&attributes, 15);
     psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT);
@@ -274,7 +274,7 @@
     psa_set_key_bits(&attributes, 1024);
 
     /* Generate a key */
-    status = m_crypto_client->generate_key(&attributes, &key_handle);
+    status = m_crypto_client->generate_key(&attributes, &key_id);
     CHECK_EQUAL(PSA_SUCCESS, status);
 
     psa_reset_key_attributes(&attributes);
@@ -287,7 +287,7 @@
     /* With salt */
     uint8_t salt[] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16};
 
-    status = m_crypto_client->asymmetric_encrypt(key_handle, PSA_ALG_RSA_OAEP(PSA_ALG_SHA_256),
+    status = m_crypto_client->asymmetric_encrypt(key_id, PSA_ALG_RSA_OAEP(PSA_ALG_SHA_256),
                             message, sizeof(message),
                             salt, sizeof(salt),
                             ciphertext, sizeof(ciphertext), &ciphertext_len);
@@ -297,7 +297,7 @@
     uint8_t plaintext[256];
     size_t plaintext_len = 0;
 
-    status = m_crypto_client->asymmetric_decrypt(key_handle, PSA_ALG_RSA_OAEP(PSA_ALG_SHA_256),
+    status = m_crypto_client->asymmetric_decrypt(key_id, PSA_ALG_RSA_OAEP(PSA_ALG_SHA_256),
                             ciphertext, ciphertext_len,
                             salt, sizeof(salt),
                             plaintext, sizeof(plaintext), &plaintext_len);
@@ -308,7 +308,7 @@
     MEMCMP_EQUAL(message, plaintext, plaintext_len);
 
     /* Remove the key */
-    status = m_crypto_client->destroy_key(key_handle);
+    status = m_crypto_client->destroy_key(key_id);
     CHECK_EQUAL(PSA_SUCCESS, status);
 }
 
diff --git a/components/service/crypto/test/service/psa_crypto_api/component.cmake b/components/service/crypto/test/service/psa_crypto_api/component.cmake
new file mode 100644
index 0000000..5fb9a17
--- /dev/null
+++ b/components/service/crypto/test/service/psa_crypto_api/component.cmake
@@ -0,0 +1,14 @@
+#-------------------------------------------------------------------------------
+# Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-------------------------------------------------------------------------------
+if (NOT DEFINED TGT)
+	message(FATAL_ERROR "mandatory parameter TGT is not defined.")
+endif()
+
+target_sources(${TGT} PRIVATE
+	"${CMAKE_CURRENT_LIST_DIR}/psa_crypto_api_tests.cpp"
+	"${CMAKE_CURRENT_LIST_DIR}/psa_crypto_api_client.cpp"
+	)
diff --git a/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_client.cpp b/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_client.cpp
new file mode 100644
index 0000000..6bf43fe
--- /dev/null
+++ b/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_client.cpp
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "psa_crypto_api_client.h"
+#include <service/crypto/client/psa/psa_crypto_client.h>
+
+
+psa_crypto_api_client::psa_crypto_api_client() :
+    crypto_client()
+{
+
+}
+
+psa_crypto_api_client::~psa_crypto_api_client()
+{
+
+}
+
+psa_status_t psa_crypto_api_client::generate_key(const psa_key_attributes_t *attributes, psa_key_id_t *id)
+{
+    psa_status_t psa_status = psa_generate_key(attributes, id);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+psa_status_t psa_crypto_api_client::destroy_key(psa_key_id_t id)
+{
+    psa_status_t psa_status = psa_destroy_key(id);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+psa_status_t psa_crypto_api_client::import_key(const psa_key_attributes_t *attributes,
+                        const uint8_t *data, size_t data_length, psa_key_id_t *id)
+{
+    psa_status_t psa_status = psa_import_key(attributes, data, data_length, id);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+psa_status_t psa_crypto_api_client::export_key(psa_key_id_t id,
+                        uint8_t *data, size_t data_size,
+                        size_t *data_length)
+{
+    psa_status_t psa_status = psa_export_key(id, data, data_size, data_length);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+psa_status_t psa_crypto_api_client::export_public_key(psa_key_id_t id,
+                                uint8_t *data, size_t data_size, size_t *data_length)
+{
+    psa_status_t psa_status = psa_export_public_key(id, data, data_size, data_length);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+psa_status_t psa_crypto_api_client::sign_hash(psa_key_id_t id, psa_algorithm_t alg,
+                            const uint8_t *hash, size_t hash_length,
+                            uint8_t *signature, size_t signature_size, size_t *signature_length)
+{
+    psa_status_t psa_status = psa_sign_hash(id, alg, hash, hash_length,
+                                    signature, signature_size, signature_length);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+
+psa_status_t psa_crypto_api_client::verify_hash(psa_key_id_t id, psa_algorithm_t alg,
+                        const uint8_t *hash, size_t hash_length,
+                        const uint8_t *signature, size_t signature_length)
+{
+    psa_status_t psa_status = psa_verify_hash(id, alg, hash, hash_length,
+                                    signature, signature_length);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+psa_status_t psa_crypto_api_client::asymmetric_encrypt(psa_key_id_t id, psa_algorithm_t alg,
+                        const uint8_t *input, size_t input_length,
+                        const uint8_t *salt, size_t salt_length,
+                        uint8_t *output, size_t output_size, size_t *output_length)
+{
+    psa_status_t psa_status = psa_asymmetric_encrypt(id, alg, input, input_length,
+                                                salt, salt_length,
+                                                output, output_size, output_length);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+psa_status_t psa_crypto_api_client::asymmetric_decrypt(psa_key_id_t id, psa_algorithm_t alg,
+                        const uint8_t *input, size_t input_length,
+                        const uint8_t *salt, size_t salt_length,
+                        uint8_t *output, size_t output_size, size_t *output_length)
+{
+    psa_status_t psa_status = psa_asymmetric_decrypt(id, alg, input, input_length,
+                                                salt, salt_length,
+                                                output, output_size, output_length);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
+
+psa_status_t psa_crypto_api_client::generate_random(uint8_t *output, size_t output_size)
+{
+    psa_status_t psa_status = psa_generate_random(output, output_size);
+    m_err_rpc_status = psa_crypto_client_rpc_status();
+
+    return psa_status;
+}
diff --git a/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_client.h b/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_client.h
new file mode 100644
index 0000000..66f4431
--- /dev/null
+++ b/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_client.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PSA_CRYPTO_API_CLIENT_H
+#define PSA_CRYPTO_API_CLIENT_H
+
+#include <service/crypto/client/cpp/crypto_client.h>
+
+/*
+ * A concrete crypto_client that uses the psa crypto api
+ */
+class psa_crypto_api_client : public crypto_client
+{
+public:
+    psa_crypto_api_client();
+     virtual ~psa_crypto_api_client();
+
+    /* Key lifecycle methods */
+    psa_status_t generate_key(const psa_key_attributes_t *attributes, psa_key_id_t *id);
+    psa_status_t destroy_key(psa_key_id_t id);
+    psa_status_t import_key(const psa_key_attributes_t *attributes,
+                            const uint8_t *data, size_t data_length, psa_key_id_t *id);
+
+    /* Key export methods */
+    psa_status_t export_key(psa_key_id_t id,
+                            uint8_t *data, size_t data_size,
+                            size_t *data_length);
+    psa_status_t export_public_key(psa_key_id_t id,
+                            uint8_t *data, size_t data_size, size_t *data_length);
+
+    /* Sign/verify methods */
+    psa_status_t sign_hash(psa_key_id_t id, psa_algorithm_t alg,
+                            const uint8_t *hash, size_t hash_length,
+                            uint8_t *signature, size_t signature_size, size_t *signature_length);
+    psa_status_t verify_hash(psa_key_id_t id, psa_algorithm_t alg,
+                            const uint8_t *hash, size_t hash_length,
+                            const uint8_t *signature, size_t signature_length);
+
+    /* Asymmetric encrypt/decrypt */
+    psa_status_t asymmetric_encrypt(psa_key_id_t id, psa_algorithm_t alg,
+                            const uint8_t *input, size_t input_length,
+                            const uint8_t *salt, size_t salt_length,
+                            uint8_t *output, size_t output_size, size_t *output_length);
+    psa_status_t asymmetric_decrypt(psa_key_id_t id, psa_algorithm_t alg,
+                            const uint8_t *input, size_t input_length,
+                            const uint8_t *salt, size_t salt_length,
+                            uint8_t *output, size_t output_size, size_t *output_length);
+
+    /* Random number generation */
+    psa_status_t generate_random(uint8_t *output, size_t output_size);
+};
+
+#endif /* PSA_CRYPTO_API_CLIENT_H */
diff --git a/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_tests.cpp b/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_tests.cpp
new file mode 100644
index 0000000..dae0b72
--- /dev/null
+++ b/components/service/crypto/test/service/psa_crypto_api/psa_crypto_api_tests.cpp
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include "psa_crypto_api_client.h"
+#include <service/crypto/client/psa/psa_crypto_client.h>
+#include <service/crypto/test/service/crypto_service_scenarios.h>
+#include <protocols/rpc/common/packed-c/encoding.h>
+#include <service_locator.h>
+#include <CppUTest/TestHarness.h>
+
+/*
+ * Service-level tests that use the psa crypto api
+ */
+TEST_GROUP(PsaCryptoApiTests)
+{
+    void setup()
+    {
+        struct rpc_caller *caller;
+        int status;
+
+        m_rpc_session_handle = NULL;
+        m_crypto_service_context = NULL;
+        m_scenarios = NULL;
+
+        service_locator_init();
+
+        m_crypto_service_context = service_locator_query("sn:trustedfirmware.org:crypto:0", &status);
+        CHECK_TRUE(m_crypto_service_context);
+
+        m_rpc_session_handle = service_context_open(m_crypto_service_context, TS_RPC_ENCODING_PACKED_C, &caller);
+        CHECK_TRUE(m_rpc_session_handle);
+
+        psa_crypto_client_init(caller);
+        m_scenarios = new crypto_service_scenarios(new psa_crypto_api_client());
+    }
+
+    void teardown()
+    {
+        delete m_scenarios;
+        m_scenarios = NULL;
+
+        psa_crypto_client_deinit();
+
+        service_context_close(m_crypto_service_context, m_rpc_session_handle);
+        m_rpc_session_handle = NULL;
+
+        service_context_relinquish(m_crypto_service_context);
+        m_crypto_service_context = NULL;
+    }
+
+    rpc_session_handle m_rpc_session_handle;
+    struct service_context *m_crypto_service_context;
+    crypto_service_scenarios *m_scenarios;
+};
+
+TEST(PsaCryptoApiTests, generateVolatileKeys)
+{
+    m_scenarios->generateVolatileKeys();
+}
+
+TEST(PsaCryptoApiTests, generatePersistentKeys)
+{
+    m_scenarios->generatePersistentKeys();
+}
+
+TEST(PsaCryptoApiTests, exportPublicKey)
+{
+    m_scenarios->exportPublicKey();
+}
+
+TEST(PsaCryptoApiTests, exportAndImportKeyPair)
+{
+    m_scenarios->exportAndImportKeyPair();
+}
+
+TEST(PsaCryptoApiTests, signAndVerifyHash)
+{
+    m_scenarios->signAndVerifyHash();
+}
+
+TEST(PsaCryptoApiTests, asymEncryptDecrypt)
+{
+    m_scenarios->asymEncryptDecrypt();
+}
+
+TEST(PsaCryptoApiTests, asymEncryptDecryptWithSalt)
+{
+    m_scenarios->asymEncryptDecryptWithSalt();
+}
+
+TEST(PsaCryptoApiTests, generateRandomNumbers)
+{
+    m_scenarios->generateRandomNumbers();
+}
diff --git a/components/service/common/component.cmake b/components/service/secure_storage/include/component.cmake
similarity index 100%
copy from components/service/common/component.cmake
copy to components/service/secure_storage/include/component.cmake
diff --git a/components/service/common/psa/internal_trusted_storage.h b/components/service/secure_storage/include/psa/internal_trusted_storage.h
similarity index 100%
rename from components/service/common/psa/internal_trusted_storage.h
rename to components/service/secure_storage/include/psa/internal_trusted_storage.h
diff --git a/components/service/common/psa/protected_storage.h b/components/service/secure_storage/include/psa/protected_storage.h
similarity index 100%
rename from components/service/common/psa/protected_storage.h
rename to components/service/secure_storage/include/psa/protected_storage.h
diff --git a/components/service/common/psa/storage_common.h b/components/service/secure_storage/include/psa/storage_common.h
similarity index 100%
rename from components/service/common/psa/storage_common.h
rename to components/service/secure_storage/include/psa/storage_common.h