diff --git a/include/psa/crypto_driver.h b/include/psa/crypto_driver.h
new file mode 100644
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+++ b/include/psa/crypto_driver.h
@@ -0,0 +1,1778 @@
+/**
+ * \file psa/crypto_driver.h
+ * \brief Platform Security Architecture cryptographic driver module
+ * 
+ * This file describes an API for driver developers to implement to enable
+ * hardware to be called in a standardized way by a PSA Cryptographic API
+ * implementation. The API described is not intended to be called by
+ * application developers.
+ */
+
+/*
+ *  Copyright (C) 2018, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License"); you may
+ *  not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+#ifndef __PSA_CRYPTO_DRIVER_H__
+#define __PSA_CRYPTO_DRIVER_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+/** The following types are redefinitions from the psa/crypto.h file.
+ * It is intended that these will be moved to a new common header file to 
+ * avoid duplication. They are included here for expediency in publication.
+ */
+typedef uint32_t psa_status_t;
+typedef uint32_t psa_algorithm_t;
+typedef uint8_t encrypt_or_decrypt_t;
+typedef uint32_t psa_key_slot_t;
+typedef uint32_t psa_key_type_t;
+typedef uint32_t psa_key_usage_t;
+
+#define PSA_CRYPTO_DRIVER_ENCRYPT 1
+#define PSA_CRYPTO_DRIVER_DECRYPT 0
+
+/** \defgroup opaque_mac Opaque Message Authentication Code
+ * Generation and authentication of Message Authentication Codes (MACs) using
+ * opaque keys can be done either as a single function call (via the 
+ * `pcd_mac_opaque_generate_t` or `psa_mac_opaque_verify_t` functions), or in
+ * parts using the following sequence:
+ * - `psa_mac_opaque_setup_t`
+ * - `psa_mac_opaque_update_t`
+ * - `psa_mac_opaque_update_t`
+ * - ...
+ * - `psa_mac_opaque_finish_t` or `psa_mac_opaque_finish_verify_t`
+ * 
+ * If a previously started Opaque MAC operation needs to be terminated, it 
+ * should be done so by the `psa_mac_opaque_abort_t`. Failure to do so may
+ * result in allocated resources not being freed or in other undefined
+ * behavior.
+ */
+/**@{*/
+/** \brief A function that starts a MAC operation for a PSA Crypto Driver 
+ * implementation using an opaque key
+ * 
+ * \param[in,out] p_context     A structure that will contain the 
+ *                              hardware-specific MAC context
+ * \param[in] key_slot          The slot of the key to be used for the
+ *                              operation
+ * \param[in] algorithm         The algorithm to be used to underly the MAC 
+ *                              operation
+ * 
+ * \retval  PSA_SUCCESS
+ *          Success.
+ */
+typedef psa_status_t (*pcd_mac_opaque_setup_t)(void *p_context,
+                                               psa_key_slot_t key_slot,
+                                               psa_algorithm_t algorithm);
+
+/** \brief A function that continues a previously started MAC operation using
+ * an opaque key
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously-established MAC operation to be
+ *                              continued
+ * \param[in] p_input           A buffer containing the message to be appended
+ *                              to the MAC operation
+ * \param[in] input_length  The size in bytes of the input message buffer
+ */
+typedef psa_status_t (*pcd_mac_opaque_update_t)(void *p_context,
+                                                const uint8_t *p_input,
+                                                size_t input_length);
+
+/** \brief a function that completes a previously started MAC operation by
+ * returning the resulting MAC using an opaque key
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the 
+ *                              previously started MAC operation to be 
+ *                              finished
+ * \param[out] p_mac            A buffer where the generated MAC will be
+ *                              placed
+ * \param[in] mac_size          The size in bytes of the buffer that has been
+ *                              allocated for the `output` buffer
+ * \param[out] p_mac_length     After completion, will contain the number of
+ *                              bytes placed in the `p_mac` buffer
+ * 
+ * \retval PSA_SUCCESS
+ *          Success.
+ */
+typedef psa_status_t (*pcd_mac_opaque_finish_t)(void *p_context,
+                                                uint8_t *p_mac,
+                                                size_t mac_size,
+                                                size_t *p_mac_length);
+
+/** \brief A function that completes a previously started MAC operation by
+ * comparing the resulting MAC against a known value using an opaque key
+ * 
+ * \param[in,out] p_context A hardware-specific structure for the previously
+ *                          started MAC operation to be fiinished
+ * \param[in] p_mac         The MAC value against which the resulting MAC will
+ *                          be compared against
+ * \param[in] mac_length    The size in bytes of the value stored in `p_mac`
+ * 
+ * \retval PSA_SUCCESS
+ *         The operation completed successfully and the MACs matched each
+ *         other
+ * \retval PSA_ERROR_INVALID_SIGNATURE
+ *         The operation completed successfully, but the calculated MAC did
+ *         not match the provided MAC
+ */
+typedef psa_status_t (*pcd_mac_opaque_finish_verify_t)(void *p_context,
+                                                       const uint8_t *p_mac,
+                                                       size_t mac_length);
+
+/** \brief A function that aborts a previous started opaque-key MAC operation
+
+ * \param[in,out] p_context A hardware-specific structure for the previously
+ *                          started MAC operation to be aborted
+ */
+typedef psa_status_t (*pcd_mac_opaque_abort_t)(void *p_context);
+
+/** \brief A function that performs a MAC operation in one command and returns
+ * the calculated MAC using an opaque key
+ * 
+ * \param[in] p_input           A buffer containing the message to be MACed
+ * \param[in] input_length      The size in bytes of `p_input`
+ * \param[in] key_slot          The slot of the key to be used
+ * \param[in] alg               The algorithm to be used to underlie the MAC
+ *                              operation
+ * \param[out] p_mac            A buffer where the generated MAC will be
+ *                              placed
+ * \param[in] mac_size          The size in bytes of the `p_mac` buffer
+ * \param[out] p_mac_length     After completion, will contain the number of
+ *                              bytes placed in the `output` buffer
+ * 
+ * \retval PSA_SUCCESS
+ *         Success.
+ */
+typedef psa_status_t (*pcd_mac_opaque_generate_t)(const uint8_t *p_input,
+                                                  size_t input_length,
+                                                  psa_key_slot_t key_slot,
+                                                  psa_algorithm_t alg,
+                                                  uint8_t *p_mac,
+                                                  size_t mac_size,
+                                                  size_t *p_mac_length);
+
+/** \brief A function that performs an MAC operation in one command and
+ * compare the resulting MAC against a known value using an opaque key
+ * 
+ * \param[in] p_input       A buffer containing the message to be MACed
+ * \param[in] input_length  The size in bytes of `input`
+ * \param[in] key_slot      The slot of the key to be used
+ * \param[in] alg           The algorithm to be used to underlie the MAC
+ *                          operation
+ * \param[in] p_mac         The MAC value against which the resulting MAC will
+ *                          be compared against
+ * \param[in] mac_length   The size in bytes of `mac`
+ * 
+ * \retval PSA_SUCCESS
+ *         The operation completed successfully and the MACs matched each
+ *         other
+ * \retval PSA_ERROR_INVALID_SIGNATURE
+ *         The operation completed successfully, but the calculated MAC did
+ *         not match the provided MAC
+ */
+typedef psa_status_t (*pcd_mac_opaque_verify_t)(const uint8_t *p_input,
+                                                size_t input_length,
+                                                psa_key_slot_t key_slot,
+                                                psa_algorithm_t alg,
+                                                const uint8_t *p_mac,
+                                                size_t mac_length);
+
+/** \brief A struct containing all of the function pointers needed to
+ * implement MAC operations using opaque keys.
+ * 
+ * PSA Crypto API implementations should populate the table as appropriate
+ * upon startup.
+ *
+ * If one of the functions is not implemented (such as
+ * `pcd_mac_opaque_generate_t`), it should be set to NULL.
+ * 
+ * Driver implementers should ensure that they implement all of the functions
+ * that make sense for their hardware, and that they provide a full solution
+ * (for example, if they support `p_setup`, they should also support
+ * `p_update` and at least one of `p_finish` or `p_finish_verify`).
+ * 
+ */
+struct pcd_mac_opaque_t {
+    /**The size in bytes of the hardware-specific Opaque-MAC Context structure
+    */
+    size_t                          context_size;
+    /** Function that performs the setup operation
+     */
+    pcd_mac_opaque_setup_t          *p_setup;
+    /** Function that performs the update operation
+     */
+    pcd_mac_opaque_update_t         *p_update;
+    /** Function that completes the operation
+     */
+    pcd_mac_opaque_finish_t         *p_finish;
+    /** Function that completed a MAC operation with a verify check
+     */
+    pcd_mac_opaque_finish_verify_t  *p_finish_verify;
+    /** Function that aborts a previoustly started operation
+     */
+    pcd_mac_opaque_abort_t          *p_abort;
+    /** Function that performs the MAC operation in one call
+     */
+    pcd_mac_opaque_generate_t       *p_mac;
+    /** Function that performs the MAC and verify operation in one call
+     */
+    pcd_mac_opaque_verify_t         *p_mac_verify;
+};
+/**@}*/
+
+/** \defgroup transparent_mac Transparent Message Authentication Code
+ * Generation and authentication of Message Authentication Codes (MACs) using
+ * transparent keys can be done either as a single function call (via the 
+ * `pcd_mac_transparent_generate_t` or `psa_mac_transparent_verify_t`
+ * functions), or in parts using the following sequence:
+ * - `psa_mac_transparent_setup_t`
+ * - `psa_mac_transparent_update_t`
+ * - `psa_mac_transparent_update_t`
+ * - ...
+ * - `psa_mac_transparent_finish_t` or `psa_mac_transparent_finish_verify_t`
+ * 
+ * If a previously started Transparent MAC operation needs to be terminated, it 
+ * should be done so by the `psa_mac_transparent_abort_t`. Failure to do so may
+ * result in allocated resources not being freed or in other undefined
+ * behavior.
+ * 
+ */
+/**@{*/
+
+/** \brief The hardware-specific transparent-key MAC context structure
+ *
+ * The contents of this structure are implementation dependent and are
+ * therefore not described here.
+ */
+typedef struct pcd_mac_transparent_context_s pcd_mac_transparent_context_t;
+
+/** \brief The function prototype for the setup operation of a
+ * transparent-key MAC operation
+ * 
+ *  Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_setup
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying primitive, and `MAC_VARIANT`
+ * is the specific variant of a MAC operation (such as HMAC or CMAC)
+ * 
+ * \param[in,out] p_context     A structure that will contain the 
+ *                              hardware-specific MAC context
+ * \param[in] p_key             A buffer containing the cleartext key material
+ *                              to be used in the operation
+ * \param[in] key_length        The size in bytes of the key material
+ * 
+ * \retval  PSA_SUCCESS
+ *          Success.
+ */
+typedef psa_status_t (*pcd_mac_transparent_setup_t)(pcd_mac_transparent_context_t *p_context,
+                                                    const uint8_t *p_key,
+                                                    size_t key_length);
+
+/** \brief The function prototype for the update operation of a
+ * transparent-key MAC operation
+ *
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_update
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm, and `MAC_VARIANT`
+ * is the specific variant of a MAC operation (such as HMAC or CMAC)
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously-established MAC operation to be
+ *                              continued
+ * \param[in] p_input           A buffer containing the message to be appended
+ *                              to the MAC operation
+ * \param[in] input_length      The size in bytes of the input message buffer
+ */
+typedef psa_status_t (*pcd_mac_transparent_update_t)(pcd_mac_transparent_context_t *p_context,
+                                                     const uint8_t *p_input,
+                                                     size_t input_length);
+
+/** \brief  The function prototype for the finish operation of a
+ * transparent-key MAC operation
+ * 
+ * Functions that implement the prototype should be named in the following
+ *  convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_finish
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm, and `MAC_VARIANT` is
+ * the specific variant of a MAC operation (such as HMAC or CMAC)
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously started MAC operation to be
+ *                              finished
+ * \param[out] p_mac            A buffer where the generated MAC will be placed
+ * \param[in] mac_length        The size in bytes of the buffer that has been
+ *                              allocated for the `p_mac` buffer
+ * 
+ * \retval PSA_SUCCESS
+ *          Success.
+ */
+typedef psa_status_t (*pcd_mac_transparent_finish_t)(pcd_mac_transparent_context_t *p_context,
+                                                     uint8_t *p_mac,
+                                                     size_t mac_length);
+
+/** \brief The function prototype for the finish and verify operation of a
+ * transparent-key MAC operation
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_finish_verify
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm, and `MAC_VARIANT` is
+ * the specific variant of a MAC operation (such as HMAC or CMAC)
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously started MAC operation to be
+ *                              verified and finished
+ * \param[in] p_mac             A buffer containing the MAC that will be used
+ *                              for verification
+ * \param[in] mac_length        The size in bytes of the data in the `p_mac`
+ *                              buffer
+ * 
+ * \retval PSA_SUCCESS
+ *          The operation completed successfully and the comparison matched
+ */
+typedef psa_status_t (*pcd_mac_transparent_finish_verify_t)(pcd_mac_transparent_context_t *p_context,
+                                                            const uint8_t *p_mac,
+                                                            size_t mac_length);
+
+/** \brief The function prototype for the abort operation for a previously
+ * started transparent-key MAC operation
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_abort
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm, and `MAC_VARIANT` is
+ * the specific variant of a MAC operation (such as HMAC or CMAC)
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously started MAC operation to be
+ *                              aborted
+ * 
+ */
+typedef psa_status_t (*pcd_mac_transparent_abort_t)(pcd_mac_transparent_context_t *p_context);
+
+/** \brief The function prototype for a one-shot operation of a transparent-key
+ * MAC operation
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm, and `MAC_VARIANT` is 
+ * the specific variant of a MAC operation (such as HMAC or CMAC)
+ * 
+ * \param[in] p_input        A buffer containing the data to be MACed
+ * \param[in] input_length   The length in bytes of the `p_input` data
+ * \param[in] p_key          A buffer containing the key material to be used
+ *                           for the MAC operation
+ * \param[in] key_length     The length in bytes of the `p_key` data
+ * \param[in] alg            The algorithm to be performed
+ * \param[out] p_mac         The buffer where the resulting MAC will be placed
+ *                           upon success
+ * \param[in] mac_length     The length in bytes of the `p_mac` buffer
+ */
+typedef psa_status_t (*pcd_mac_transparent_t)(const uint8_t *p_input,
+                                              size_t input_length,
+                                              const uint8_t *p_key,
+                                              size_t key_length,
+                                              psa_algorithm_t alg,
+                                              uint8_t *p_mac,
+                                              size_t mac_length);
+
+/** \brief The function prototype for a one-shot operation of a transparent-key
+ * MAC Verify operation
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_mac_transparent_<ALGO>_<MAC_VARIANT>_verify
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm, and `MAC_VARIANT` is
+ * the specific variant of a MAC operation (such as HMAC or CMAC)
+ * 
+ * \param[in] p_input        A buffer containing the data to be MACed
+ * \param[in] input_length   The length in bytes of the `p_input` data
+ * \param[in] p_key          A buffer containing the key material to be used
+ *                           for the MAC operation
+ * \param[in] key_length     The length in bytes of the `p_key` data
+ * \param[in] alg            The algorithm to be performed
+ * \param[in] p_mac          The MAC data to be compared
+ * \param[in] mac_length     The length in bytes of the `p_mac` buffer
+ * 
+ * \retval PSA_SUCCESS
+ *  The operation completed successfully and the comparison matched
+ */
+typedef psa_status_t (*pcd_mac_transparent_verify_t)(const uint8_t *p_input,
+                                                     size_t input_length,
+                                                     const uint8_t *p_key,
+                                                     size_t key_length,
+                                                     psa_algorithm_t alg,
+                                                     const uint8_t *p_mac,
+                                                     size_t mac_length);
+/**@}*/
+
+/** \defgroup opaque_cipher Opaque Symmetric Ciphers
+ * 
+ * Encryption and Decryption using opaque keys in block modes other than ECB
+ * must be done in multiple parts, using the following flow:
+ * - `pcd_cipher_opaque_setup_t`
+ * - `pcd_cipher_opaque_set_iv_t` (optional depending upon block mode)
+ * - `pcd_cipher_opaque_update_t`
+ * - ...
+ * - `pcd_cipher_opaque_finish_t`
+
+ * If a previously started Opaque Cipher operation needs to be terminated, it 
+ * should be done so by the `psa_cipher_opaque_abort_t`. Failure to do so may
+ * result in allocated resources not being freed or in other undefined
+ * behavior.
+ * 
+ * In situations where a PSA Cryptographic API implementation is using a block
+ * mode not-supported by the underlying hardware or driver, it can construct
+ * the block mode itself, while calling the `pcd_cipher_opaque_ecb_t` function
+ * pointer for the cipher operations.
+ */
+/**@{*/
+
+/** \brief A function pointer that provides the cipher setup function for
+ * opaque-key operations
+ *
+ * \param[in,out] p_context     A structure that will contain the
+ *                              hardware-specific cipher context.
+ * \param[in] key_slot          The slot of the key to be used for the
+ *                              operation
+ * \param[in] algorithm         The algorithm to be used in the cipher
+ *                              operation
+ * \param[in] direction         Indicates whether the operation is an encrypt
+ *                              or decrypt
+ * 
+ * \retval PSA_SUCCESS
+ * \retval PSA_ERROR_NOT_SUPPORTED
+ */
+typedef psa_status_t (*pcd_cipher_opaque_setup_t)(void *p_context,
+                                                  psa_key_slot_t key_slot,
+                                                  psa_algorithm_t algorithm,
+                                                  encrypt_or_decrypt_t direction);
+
+/** \brief A function pointer that sets the initialization vector (if
+ * necessary) for an opaque cipher operation
+ * 
+ * Rationale: The `psa_cipher_*` function in the PSA Cryptographic API has two
+ * IV functions: one to set the IV, and one to generate it internally. The
+ * generate function is not necessary for the driver API as the PSA Crypto
+ * implementation can do the generation using its RNG features.
+ * 
+ * \param[in,out] p_context     A structure that contains the previously set up
+ *                              hardware-specific cipher context
+ * \param[in] p_iv              A buffer containing the initialization vector
+ * \param[in] iv_length         The size (in bytes) of the `p_iv` buffer
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_opaque_set_iv_t)(void *p_context,
+                                                   const uint8_t *p_iv,
+                                                   size_t iv_length);
+
+/** \brief A function that continues a previously started opaque-key cipher
+ * operation
+ * 
+ * \param[in,out] p_context         A hardware-specific structure for the
+ *                                  previously started cipher operation
+ * \param[in] p_input               A buffer containing the data to be
+ *                                  encrypted/decrypted
+ * \param[in] input_size            The size in bytes of the buffer pointed to
+ *                                  by `p_input`
+ * \param[out] p_output             The caller-allocated buffer where the
+ *                                  output will be placed
+ * \param[in] output_size           The allocated size in bytes of the
+ *                                  `p_output` buffer
+ * \param[out] p_output_length      After completion, will contain the number
+ *                                  of bytes placed in the `p_output` buffer
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_opaque_update_t)(void *p_context,
+                                                   const uint8_t *p_input,
+                                                   size_t input_size,
+                                                   uint8_t *p_output,
+                                                   size_t output_size,
+                                                   size_t *p_output_length);
+
+/** \brief A function that completes a previously started opaque-key cipher
+ * operation
+ *
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously started cipher operation
+ * \param[out] p_output         The caller-allocated buffer where the output
+ *                              will be placed
+ * \param[in] output_size       The allocated size in bytes of the `p_output`
+ *                              buffer
+ * \param[out] p_output_length  After completion, will contain the number of
+ *                              bytes placed in the `p_output` buffer
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_opaque_finish_t)(void *p_context,
+                                                   uint8_t *p_output,
+                                                   size_t output_size,
+                                                   size_t *p_output_length);
+
+/** \brief A function that aborts a previously started opaque-key cipher
+ * operation
+ *
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously started cipher operation
+ */
+typedef psa_status_t (*pcd_cipher_opaque_abort_t)(void *p_context);
+
+/** \brief A function that performs the ECB block mode for opaque-key cipher
+ * operations
+ * 
+ * Note: this function should only be used with implementations that do not
+ * provide a needed higher-level operation.
+ * 
+ * \param[in] key_slot      The slot of the key to be used for the operation
+ * \param[in] algorithm     The algorithm to be used in the cipher operation
+ * \param[in] direction     Indicates whether the operation is an encrypt or
+ *                          decrypt
+ * \param[in] p_input       A buffer containing the data to be
+ *                          encrypted/decrypted
+ * \param[in] input_size    The size in bytes of the buffer pointed to by
+ *                          `p_input`
+ * \param[out] p_output     The caller-allocated buffer where the output will
+ *                          be placed
+ * \param[in] output_size   The allocated size in bytes of the `p_output`
+ *                          buffer
+ * 
+ * \retval PSA_SUCCESS
+ * \retval PSA_ERROR_NOT_SUPPORTED
+ */
+typedef psa_status_t (*pcd_cipher_opaque_ecb_t)(psa_key_slot_t key_slot,
+                                                psa_algorithm_t algorithm,
+                                                encrypt_or_decrypt_t direction,
+                                                const uint8_t *p_input,
+                                                size_t input_size,
+                                                uint8_t *p_output,
+                                                size_t output_size);
+
+/**
+ * \brief A struct containing all of the function pointers needed to implement
+ * cipher operations using opaque keys.
+ * 
+ * PSA Crypto API implementations should populate instances of the table as
+ * appropriate upon startup.
+ * 
+ * If one of the functions is not implemented (such as
+ * `pcd_cipher_opaque_ecb_t`), it should be set to NULL.
+ */
+struct pcd_cipher_opaque_t {
+    /** The size in bytes of the hardware-specific Opaque Cipher context
+     * structure
+     */
+    size_t                      size;
+    /** Function that performs the setup operation */
+    pcd_cipher_opaque_setup_t  *p_setup;
+    /** Function that sets the IV (if necessary) */
+    pcd_cipher_opaque_set_iv_t *p_set_iv;
+    /** Function that performs the update operation */
+    pcd_cipher_opaque_update_t *p_update;
+    /** Function that completes the operation */
+    pcd_cipher_opaque_finish_t *p_finish;
+    /** Function that aborts the operation */
+    pcd_cipher_opaque_abort_t  *p_abort;
+    /** Function that performs ECB mode for the cipher
+     * (Danger: ECB mode should not be used directly by clients of the PSA
+     * Crypto Client API)
+     */
+    pcd_cipher_opaque_ecb_t    *p_ecb;
+};
+
+/**@}*/
+
+/** \defgroup transparent_cipher Transparent Block Cipher
+ * Encryption and Decryption using transparent keys in block modes other than
+ * ECB must be done in multiple parts, using the following flow:
+ * - `pcd_cipher_transparent_setup_t`
+ * - `pcd_cipher_transparent_set_iv_t` (optional depending upon block mode)
+ * - `pcd_cipher_transparent_update_t`
+ * - ...
+ * - `pcd_cipher_transparent_finish_t`
+
+ * If a previously started Transparent Cipher operation needs to be terminated,
+ * it should be done so by the `psa_cipher_transparent_abort_t`. Failure to do
+ * so may result in allocated resources not being freed or in other undefined
+ * behavior.
+ */
+/**@{*/
+
+/** \brief The hardware-specific transparent-key Cipher context structure
+ * 
+ * The contents of this structure are implementation dependent and are
+ * therefore not described here.
+ */
+typedef struct pcd_cipher_transparent_context_s pcd_cipher_transparent_context_t;
+
+/** \brief The function prototype for the setup operation of transparent-key
+ * block cipher operations.
+ *  Functions that implement the prototype should be named in the following
+ * conventions:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_setup_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ * or for stream ciphers:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_setup_<CIPHER_NAME>
+ * ~~~~~~~~~~~~~
+ * Where `CIPHER_NAME` is the name of a stream cipher (i.e. RC4)
+ * 
+ * \param[in,out] p_context     A structure that will contain the
+ *                              hardware-specific cipher context
+ * \param[in] direction         Indicates if the operation is an encrypt or a
+ *                              decrypt
+ * \param[in] p_key_data        A buffer containing the cleartext key material
+ *                              to be used in the operation
+ * \param[in] key_data_size     The size in bytes of the key material
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_transparent_setup_t)(pcd_cipher_transparent_context_t *p_context,
+                                                       encrypt_or_decrypt_t direction,
+                                                       const uint8_t *p_key_data,
+                                                       size_t key_data_size);
+
+/** \brief The function prototype for the set initialization vector operation
+ * of transparent-key block cipher operations
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_set_iv_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ * 
+ * \param[in,out] p_context     A structure that contains the previously setup
+ *                              hardware-specific cipher context
+ * \param[in] p_iv              A buffer containing the initialization vecotr
+ * \param[in] iv_length         The size in bytes of the contents of `p_iv`
+ * 
+ * \retval PSA_SUCCESS
+*/
+typedef psa_status_t (*pcd_cipher_transparent_set_iv_t)(pcd_cipher_transparent_context_t *p_context,
+                                                        const uint8_t *p_iv,
+                                                        size_t iv_length);
+
+/** \brief The function prototype for the update operation of transparent-key
+ * block cipher operations.
+ *
+ *  Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_update_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ * 
+ * \param[in,out] p_context         A hardware-specific structure for the
+ *                                  previously started cipher operation
+ * \param[in] p_input               A buffer containing the data to be
+ *                                  encrypted or decrypted
+ * \param[in] input_size            The size in bytes of the `p_input` buffer
+ * \param[out] p_output             A caller-allocated buffer where the
+ *                                  generated output will be placed
+ * \param[in] output_size           The size in bytes of the `p_output` buffer
+ * \param[out] p_output_length      After completion, will contain the number
+ *                                  of bytes placed in the `p_output` buffer
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_transparent_update_t)(pcd_cipher_transparent_context_t *p_context,
+                                                        const uint8_t *p_input,
+                                                        size_t input_size,
+                                                        uint8_t *p_output,
+                                                        size_t output_size,
+                                                        size_t *p_output_length);
+
+/** \brief The function prototype for the finish operation of transparent-key
+ * block cipher operations.
+*
+ *  Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_finish_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ *
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously started cipher operation
+ * \param[out] p_output         A caller-allocated buffer where the generated
+ *                              output will be placed
+ * \param[in] output_size       The size in bytes of the `p_output` buffer
+ * \param[out] p_output_length  After completion, will contain the number of
+ *                              bytes placed in the `p_output` buffer
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_transparent_finish_t)(pcd_cipher_transparent_context_t *p_context,
+                                                        uint8_t *p_output,
+                                                        size_t output_size,
+                                                        size_t *p_output_length);
+
+/** \brief The function prototype for the abort operation of transparent-key
+ * block cipher operations.
+ * 
+ *  Functions that implement the following prototype should be named in the
+ * following convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_cipher_transparent_abort_<CIPHER_NAME>_<MODE>
+ * ~~~~~~~~~~~~~
+ * Where
+ * - `CIPHER_NAME` is the name of the underlying block cipher (i.e. AES or DES)
+ * - `MODE` is the block mode of the cipher operation (i.e. CBC or CTR)
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously started cipher operation
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_cipher_transparent_abort_t)(pcd_cipher_transparent_context_t *p_context);
+
+/**@}*/
+
+/** \defgroup driver_digest Message Digests
+ * 
+ * Generation and authentication of Message Digests (aka hashes) must be done
+ * in parts using the following sequence:
+ * - `psa_hash_setup_t`
+ * - `psa_hash_update_t`
+ * - ...
+ * - `psa_hash_finish_t`
+ * 
+ * If a previously started Message Digest operation needs to be terminated
+ * before the `psa_hash_finish_t` operation is complete, it should be aborted
+ * by the `psa_hash_abort_t`. Failure to do so may result in allocated
+ * resources not being freed or in other undefined behavior.
+ */
+/**@{*/
+
+/** \brief The hardware-specific hash context structure
+ * 
+ * The contents of this structure are implementation dependent and are
+ * therefore not described here
+ */
+typedef struct pcd_hash_context_s pcd_hash_context_t;
+
+/** \brief The function prototype for the start operation of a hash (message
+ * digest) operation
+ * 
+ *  Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_hash_<ALGO>_setup
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying hash function
+ * 
+ * \param[in,out] p_context     A structure that will contain the
+ * hardware-specific hash context
+ * 
+ * \retval  PSA_SUCCESS     Success.
+ */
+typedef psa_status_t (*pcd_hash_setup_t)(pcd_hash_context_t *p_context);
+
+/** \brief The function prototype for the update operation of a hash (message
+ * digest) operation
+ *
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_hash_<ALGO>_update
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously-established hash operation to be
+ *                              continued
+ * \param[in] p_input           A buffer containing the message to be appended
+ *                              to the hash operation
+ * \param[in] input_length      The size in bytes of the input message buffer
+ */
+typedef psa_status_t (*pcd_hash_update_t)(pcd_hash_context_t *p_context,
+                                          const uint8_t *p_input,
+                                          size_t input_length);
+
+/** \brief  The prototype for the finish operation of a hash (message digest)
+ * operation
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_hash_<ALGO>_finish
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm
+ * 
+ * \param[in,out] p_context     A hardware-specific structure for the
+ *                              previously started hash operation to be
+ *                              fiinished
+ * \param[out] p_output         A buffer where the generated digest will be
+ *                              placed
+ * \param[in] output_size       The size in bytes of the buffer that has been
+ *                              allocated for the `p_output` buffer
+ * \param[out] p_output_length  The number of bytes placed in `p_output` after
+ *                              success
+ * 
+ * \retval PSA_SUCCESS
+ *          Success.
+ */
+typedef psa_status_t (*pcd_hash_finish_t)(pcd_hash_context_t *p_context,
+                                          uint8_t *p_output,
+                                          size_t output_size,
+                                          size_t *p_output_length);
+
+/** \brief The function prototype for the abort operation of a hash (message
+ * digest) operation
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_hash_<ALGO>_abort
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the underlying algorithm
+ * 
+ * \param[in,out] p_context A hardware-specific structure for the previously
+ *                          started hash operation to be aborted
+ */
+typedef void (*pcd_hash_abort_t)(pcd_hash_context_t *p_context);
+
+/**@}*/
+
+
+/** \defgroup opaque_asymmetric Opaque Asymmetric Cryptography
+ * 
+ * Since the amount of data that can (or should) be encrypted or signed using
+ * asymmetric keys is limited by the key size, asymmetric key operations using
+ * opaque keys must be done in single function calls.
+ */
+/**@{*/
+
+/**
+ * \brief A function that signs a hash or short message with a private key
+ *
+ * \param[in] key_slot              Key slot of an asymmetric key pair
+ * \param[in] alg                   A signature algorithm that is compatible
+ *                                  with the type of `key`
+ * \param[in] p_hash                The hash to sign
+ * \param[in] hash_length           Size of the `p_hash` buffer in bytes
+ * \param[out] p_signature          Buffer where the signature is to be written
+ * \param[in] signature_size        Size of the `p_signature` buffer in bytes
+ * \param[out] p_signature_length   On success, the number of bytes
+ *                                  that make up the returned signature value
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_opaque_sign_t)(psa_key_slot_t key_slot,
+                                                     psa_algorithm_t alg,
+                                                     const uint8_t *p_hash,
+                                                     size_t hash_length,
+                                                     uint8_t *p_signature,
+                                                     size_t signature_size,
+                                                     size_t *p_signature_length);
+
+/**
+ * \brief A function that verifies the signature a hash or short message using
+ * an asymmetric public key
+ *
+ * \param[in] key_slot          Key slot of a public key or an asymmetric key
+ *                              pair
+ * \param[in] alg               A signature algorithm that is compatible with
+ *                              the type of `key`
+ * \param[in] p_hash            The hash whose signature is to be verified
+ * \param[in] hash_length       Size of the `p_hash` buffer in bytes
+ * \param[in] p_signature       Buffer containing the signature to verify
+ * \param[in] signature_length  Size of the `p_signature` buffer in bytes
+ *
+ * \retval PSA_SUCCESS
+ *         The signature is valid.
+ */
+typedef psa_status_t (*pcd_asymmetric_opaque_verify_t)(psa_key_slot_t key_slot,
+                                                       psa_algorithm_t alg,
+                                                       const uint8_t *p_hash,
+                                                       size_t hash_length,
+                                                       const uint8_t *p_signature,
+                                                       size_t signature_length);
+
+/**
+ * \brief A function that encrypts a short message with an asymmetric public
+ * key
+ *
+ * \param[in] key_slot          Key slot of a public key or an asymmetric key
+ *                              pair
+ * \param[in] alg               An asymmetric encryption algorithm that is
+ *                              compatible with the type of `key`
+ * \param[in] p_input           The message to encrypt
+ * \param[in] input_length      Size of the `p_input` buffer in bytes
+ * \param[in] p_salt            A salt or label, if supported by the
+ *                              encryption algorithm
+ *                              If the algorithm does not support a
+ *                              salt, pass `NULL`.
+ *                              If the algorithm supports an optional
+ *                              salt and you do not want to pass a salt,
+ *                              pass `NULL`.
+ *                              For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ *                              supported.
+ * \param[in] salt_length       Size of the `p_salt` buffer in bytes
+ *                              If `p_salt` is `NULL`, pass 0.
+ * \param[out] p_output         Buffer where the encrypted message is to
+ *                              be written
+ * \param[in] output_size       Size of the `p_output` buffer in bytes
+ * \param[out] p_output_length  On success, the number of bytes that make up
+ *                              the returned output
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_opaque_encrypt_t)(psa_key_slot_t key_slot,
+                                                        psa_algorithm_t alg,
+                                                        const uint8_t *p_input,
+                                                        size_t input_length,
+                                                        const uint8_t *p_salt,
+                                                        size_t salt_length,
+                                                        uint8_t *p_output,
+                                                        size_t output_size,
+                                                        size_t *p_output_length);
+
+/**
+ * \brief Decrypt a short message with an asymmetric private key.
+ *
+ * \param[in] key_slot          Key slot of an asymmetric key pair
+ * \param[in] alg               An asymmetric encryption algorithm that is
+ *                              compatible with the type of `key`
+ * \param[in] p_input           The message to decrypt
+ * \param[in] input_length      Size of the `p_input` buffer in bytes
+ * \param[in] p_salt            A salt or label, if supported by the
+ *                              encryption algorithm
+ *                              If the algorithm does not support a
+ *                              salt, pass `NULL`.
+ *                              If the algorithm supports an optional
+ *                              salt and you do not want to pass a salt,
+ *                              pass `NULL`.
+ *                              For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ *                              supported.
+ * \param[in] salt_length       Size of the `p_salt` buffer in bytes
+ *                              If `p_salt` is `NULL`, pass 0.
+ * \param[out] p_output         Buffer where the decrypted message is to
+ *                              be written
+ * \param[in] output_size       Size of the `p_output` buffer in bytes
+ * \param[out] p_output_length  On success, the number of bytes
+ *                              that make up the returned output
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_opaque_decrypt_t)(psa_key_slot_t key_slot,
+                                                        psa_algorithm_t alg,
+                                                        const uint8_t *p_input,
+                                                        size_t input_length,
+                                                        const uint8_t *p_salt,
+                                                        size_t salt_length,
+                                                        uint8_t *p_output,
+                                                        size_t output_size,
+                                                        size_t *p_output_length);
+
+/**
+ * \brief A struct containing all of the function pointers needed to implement
+ * asymmetric cryptographic operations using opaque keys.
+ * 
+ * PSA Crypto API implementations should populate instances of the table as
+ * appropriate upon startup.
+ * 
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct pcd_asymmetric_opaque_t {
+    /** Function that performs the asymmetric sign operation */
+    pcd_asymmetric_opaque_sign_t    *p_sign;
+    /** Function that performs the asymmetric verify operation */
+    pcd_asymmetric_opaque_verify_t  *p_verify;
+    /** Function that performs the asymmetric encrypt operation */
+    pcd_asymmetric_opaque_encrypt_t *p_encrypt;
+    /** Function that performs the asymmetric decrypt operation */
+    pcd_asymmetric_opaque_decrypt_t *p_decrypt;
+};
+
+/**@}*/
+
+/** \defgroup transparent_asymmetric Transparent Asymmetric Cryptography
+ *
+ * Since the amount of data that can (or should) be encrypted or signed using
+ * asymmetric keys is limited by the key size, asymmetric key operations using
+ * transparent keys must be done in single function calls.
+ */
+/**@{*/
+
+
+/**
+ * \brief A function that signs a hash or short message with a transparent
+ * asymmetric private key
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_asymmetric_<ALGO>_sign
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the signing algorithm
+ * 
+ * \param[in] p_key                 A buffer containing the private key
+ *                                  material
+ * \param[in] key_size              The size in bytes of the `p_key` data
+ * \param[in] alg                   A signature algorithm that is compatible
+ *                                  with the type of `p_key`
+ * \param[in] p_hash                The hash or message to sign
+ * \param[in] hash_length           Size of the `p_hash` buffer in bytes
+ * \param[out] p_signature          Buffer where the signature is to be written
+ * \param[in] signature_size        Size of the `p_signature` buffer in bytes
+ * \param[out] p_signature_length   On success, the number of bytes
+ *                                  that make up the returned signature value
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_transparent_sign_t)(const uint8_t *p_key,
+                                                          size_t key_size,
+                                                          psa_algorithm_t alg,
+                                                          const uint8_t *p_hash,
+                                                          size_t hash_length,
+                                                          uint8_t *p_signature,
+                                                          size_t signature_size,
+                                                          size_t *p_signature_length);
+
+/**
+ * \brief A function that verifies the signature a hash or short message using
+ * a transparent asymmetric public key
+ *
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_asymmetric_<ALGO>_verify
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the signing algorithm 
+ * 
+ * \param[in] p_key             A buffer containing the public key material
+ * \param[in] key_size          The size in bytes of the `p_key` data
+ * \param[in] alg               A signature algorithm that is compatible with
+ *                              the type of `key`
+ * \param[in] p_hash            The hash or message whose signature is to be
+ *                              verified
+ * \param[in] hash_length       Size of the `p_hash` buffer in bytes
+ * \param[in] p_signature       Buffer containing the signature to verify
+ * \param[in] signature_length  Size of the `p_signature` buffer in bytes
+ *
+ * \retval PSA_SUCCESS
+ *         The signature is valid.
+ */
+typedef psa_status_t (*pcd_asymmetric_transparent_verify_t)(const uint8_t *p_key,
+                                                            size_t key_size,
+                                                            psa_algorithm_t alg,
+                                                            const uint8_t *p_hash,
+                                                            size_t hash_length,
+                                                            const uint8_t *p_signature,
+                                                            size_t signature_length);
+
+/**
+ * \brief A function that encrypts a short message with a transparent
+ * asymmetric public key
+ *
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_asymmetric_<ALGO>_encrypt
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the encryption algorithm
+ * 
+ * \param[in] p_key             A buffer containing the public key material
+ * \param[in] key_size          The size in bytes of the `p_key` data
+ * \param[in] alg               An asymmetric encryption algorithm that is
+ *                              compatible with the type of `key`
+ * \param[in] p_input           The message to encrypt
+ * \param[in] input_length      Size of the `p_input` buffer in bytes
+ * \param[in] p_salt            A salt or label, if supported by the
+ *                              encryption algorithm
+ *                              If the algorithm does not support a
+ *                              salt, pass `NULL`
+ *                              If the algorithm supports an optional
+ *                              salt and you do not want to pass a salt,
+ *                              pass `NULL`.
+ *                              For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ *                              supported.
+ * \param[in] salt_length       Size of the `p_salt` buffer in bytes
+ *                              If `p_salt` is `NULL`, pass 0.
+ * \param[out] p_output         Buffer where the encrypted message is to
+ *                              be written
+ * \param[in] output_size       Size of the `p_output` buffer in bytes
+ * \param[out] p_output_length  On success, the number of bytes
+ *                              that make up the returned output
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_transparent_encrypt_t)(const uint8_t *p_key,
+                                                             size_t key_size,
+                                                             psa_algorithm_t alg,
+                                                             const uint8_t *p_input,
+                                                             size_t input_length,
+                                                             const uint8_t *p_salt,
+                                                             size_t salt_length,
+                                                             uint8_t *p_output,
+                                                             size_t output_size,
+                                                             size_t *p_output_length);
+
+/**
+ * \brief Decrypt a short message with a transparent asymmetric private key
+ *
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_asymmetric_<ALGO>_decrypt
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the encryption algorithm
+ * 
+ * \param[in] p_key             A buffer containing the private key material
+ * \param[in] key_size          The size in bytes of the `p_key` data
+ * \param[in] alg               An asymmetric encryption algorithm that is
+ *                              compatible with the type of `key`
+ * \param[in] p_input           The message to decrypt
+ * \param[in] input_length      Size of the `p_input` buffer in bytes
+ * \param[in] p_salt            A salt or label, if supported by the
+ *                              encryption algorithm
+ *                              If the algorithm does not support a
+ *                              salt, pass `NULL`.
+ *                              If the algorithm supports an optional
+ *                              salt and you do not want to pass a salt,
+ *                              pass `NULL`.
+ *                              For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
+ *                              supported
+ * \param[in] salt_length       Size of the `p_salt` buffer in bytes
+ *                              If `p_salt` is `NULL`, pass 0
+ * \param[out] p_output         Buffer where the decrypted message is to
+ *                              be written
+ * \param[in] output_size       Size of the `p_output` buffer in bytes
+ * \param[out] p_output_length  On success, the number of bytes
+ *                              that make up the returned output
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_asymmetric_transparent_decrypt_t)(const uint8_t *p_key,
+                                                             size_t key_size,
+                                                             psa_algorithm_t alg,
+                                                             const uint8_t *p_input,
+                                                             size_t input_length,
+                                                             const uint8_t *p_salt,
+                                                             size_t salt_length,
+                                                             uint8_t *p_output,
+                                                             size_t output_size,
+                                                             size_t *p_output_length);
+
+/**@}*/
+
+/** \defgroup aead_opaque AEAD Opaque
+ * Authenticated Encryption with Additional Data (AEAD) operations with opaque
+ * keys must be done in one function call. While this creates a burden for 
+ * implementers as there must be sufficient space in memory for the entire
+ * message, it prevents decrypted data from being made available before the
+ * authentication operation is complete and the data is known to be authentic.
+ */
+/**@{*/
+
+/** \brief Process an authenticated encryption operation using an opaque key
+ *
+ * \param[in] key_slot                  Slot containing the key to use.
+ * \param[in] algorithm                 The AEAD algorithm to compute
+ *                                      (\c PSA_ALG_XXX value such that
+ *                                      #PSA_ALG_IS_AEAD(`alg`) is true)
+ * \param[in] p_nonce                   Nonce or IV to use
+ * \param[in] nonce_length              Size of the `p_nonce` buffer in bytes
+ * \param[in] p_additional_data         Additional data that will be
+ *                                      authenticated but not encrypted
+ * \param[in] additional_data_length    Size of `p_additional_data` in bytes
+ * \param[in] p_plaintext               Data that will be authenticated and
+ *                                      encrypted
+ * \param[in] plaintext_length          Size of `p_plaintext` in bytes
+ * \param[out] p_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[in] ciphertext_size           Size of the `p_ciphertext` buffer in
+ *                                      bytes
+ * \param[out] p_ciphertext_length      On success, the size of the output in
+ *                                      the `p_ciphertext` buffer
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ */
+typedef psa_status_t (*psa_aead_opaque_encrypt_t)(psa_key_slot_t key_slot,
+                                                  psa_algorithm_t algorithm,
+                                                  const uint8_t *p_nonce,
+                                                  size_t nonce_length,
+                                                  const uint8_t *p_additional_data,
+                                                  size_t additional_data_length,
+                                                  const uint8_t *p_plaintext,
+                                                  size_t plaintext_length,
+                                                  uint8_t *p_ciphertext,
+                                                  size_t ciphertext_size,
+                                                  size_t *p_ciphertext_length);
+
+/** Process an authenticated decryption operation using an opaque key
+ *
+ * \param[in] key_slot                  Slot containing the key to use
+ * \param[in] algorithm                 The AEAD algorithm to compute
+ *                                      (\c PSA_ALG_XXX value such that
+ *                                      #PSA_ALG_IS_AEAD(`alg`) is true)
+ * \param[in] p_nonce                   Nonce or IV to use
+ * \param[in] nonce_length              Size of the `p_nonce` buffer in bytes
+ * \param[in] p_additional_data         Additional data that has been
+ *                                      authenticated but not encrypted
+ * \param[in] additional_data_length    Size of `p_additional_data` in bytes
+ * \param[in] p_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[in] ciphertext_length         Size of `p_ciphertext` in bytes
+ * \param[out] p_plaintext              Output buffer for the decrypted data
+ * \param[in] plaintext_size            Size of the `p_plaintext` buffer in
+ *                                      bytes
+ * \param[out] p_plaintext_length       On success, the size of the output in
+ *                                      the `p_plaintext` buffer
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ */
+typedef psa_status_t (*psa_aead_opaque_decrypt_t)(psa_key_slot_t key_slot,
+                                                  psa_algorithm_t algorithm,
+                                                  const uint8_t *p_nonce,
+                                                  size_t nonce_length,
+                                                  const uint8_t *p_additional_data,
+                                                  size_t additional_data_length,
+                                                  const uint8_t *p_ciphertext,
+                                                  size_t ciphertext_length,
+                                                  uint8_t *p_plaintext,
+                                                  size_t plaintext_size,
+                                                  size_t *p_plaintext_length);
+
+/**
+ * \brief A struct containing all of the function pointers needed to implement
+ * Authenticated Encryption with Additional Data operations using opaque keys
+ * 
+ * PSA Crypto API implementations should populate instances of the table as
+ * appropriate upon startup.
+ * 
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct psa_aead_opaque_t {
+    /** Function that performs the AEAD encrypt operation */
+    psa_aead_opaque_encrypt_t *p_encrypt;
+    /** Function that performs the AEAD decrypt operation */
+    psa_aead_opaque_decrypt_t *p_decrypt;
+};
+/**@}*/
+
+/** \defgroup aead_transparent AEAD Transparent
+ * 
+ * Authenticated Encryption with Additional Data (AEAD) operations with
+ * transparent keys must be done in one function call. While this creates a
+ * burden for implementers as there must be sufficient space in memory for the
+ * entire message, it prevents decrypted data from being made available before
+ * the authentication operation is complete and the data is known to be
+ * authentic.
+ */
+/**@{*/
+
+/** Process an authenticated encryption operation using an opaque key.
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_aead_<ALGO>_encrypt
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the AEAD algorithm
+ *
+ * \param[in] p_key                     A pointer to the key material
+ * \param[in] key_length                The size in bytes of the key material
+ * \param[in] alg                       The AEAD algorithm to compute
+ *                                      (\c PSA_ALG_XXX value such that
+ *                                      #PSA_ALG_IS_AEAD(`alg`) is true)
+ * \param[in] nonce                     Nonce or IV to use
+ * \param[in] nonce_length              Size of the `nonce` buffer in bytes
+ * \param[in] additional_data           Additional data that will be MACed
+ *                                      but not encrypted.
+ * \param[in] additional_data_length    Size of `additional_data` in bytes
+ * \param[in] plaintext                 Data that will be MACed and
+ *                                      encrypted.
+ * \param[in] plaintext_length          Size of `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[in] ciphertext_size           Size of the `ciphertext` buffer in
+ *                                      bytes
+ *                                      This must be at least
+ *                                      #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(`alg`,
+ *                                      `plaintext_length`).
+ * \param[out] ciphertext_length        On success, the size of the output in
+ *                                      the `ciphertext` buffer
+ *
+ * \retval #PSA_SUCCESS
+ 
+ */
+typedef psa_status_t (*psa_aead_transparent_encrypt_t)(const uint8_t *p_key,
+                                                       size_t key_length,
+                                                       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 using an opaque key.
+ * 
+ * Functions that implement the prototype should be named in the following
+ * convention:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_aead_<ALGO>_decrypt
+ * ~~~~~~~~~~~~~
+ * Where `ALGO` is the name of the AEAD algorithm
+ * \param[in] p_key                     A pointer to the key material
+ * \param[in] key_length                The size in bytes of the key material
+ * \param[in] alg                       The AEAD algorithm to compute
+ *                                      (\c PSA_ALG_XXX value such that
+ *                                      #PSA_ALG_IS_AEAD(`alg`) is true)
+ * \param[in] nonce                     Nonce or IV to use
+ * \param[in] nonce_length              Size of the `nonce` buffer in bytes
+ * \param[in] additional_data           Additional data that has been MACed
+ *                                      but not encrypted
+ * \param[in] additional_data_length    Size of `additional_data` in bytes
+ * \param[in] ciphertext                Data that has been MACed 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[in] ciphertext_length         Size of `ciphertext` in bytes
+ * \param[out] plaintext                Output buffer for the decrypted data
+ * \param[in] plaintext_size            Size of the `plaintext` buffer in
+ *                                      bytes
+ *                                      This must be at least
+ *                                      #PSA_AEAD_DECRYPT_OUTPUT_SIZE(`alg`,
+ *                                      `ciphertext_length`).
+ * \param[out] plaintext_length         On success, the size of the output
+ *                                      in the \b plaintext buffer
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ */
+typedef psa_status_t (*psa_aead_transparent_decrypt_t)(const uint8_t *p_key,
+                                                       size_t key_length,
+                                                       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);
+
+/**@}*/
+
+
+/** \defgroup driver_rng Entropy Generation
+ */
+/**@{*/
+
+/** \brief A hardware-specific structure for a entropy providing hardware
+ */
+typedef struct pcd_entropy_context_s pcd_entropy_context_t;
+
+/** \brief Initialize an entropy driver
+ *
+ * 
+ * \param[in,out] p_context             A hardware-specific structure
+ *                                      containing any context information for
+ *                                      the implementation
+ *
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_entropy_init_t)(pcd_entropy_context_t *p_context);
+
+/** \brief Get a specified number of bits from the entropy source
+ * 
+ * It retrives `buffer_size` bytes of data from the entropy source. The entropy
+ * source will always fill the provided buffer to its full size, however, most
+ * entropy sources have biases, and the actual amount of entropy contained in
+ * the buffer will be less than the number of bytes.
+ * The driver will return the actual number of bytes of entropy placed in the
+ * buffer in `p_received_entropy_bytes`.
+ * A PSA Crypto API implementation will likely feed the output of this function
+ * into a Digital Random Bit Generator (DRBG), and typically has a minimum
+ * amount of entropy that it needs.
+ * To accomplish this, the PSA Crypto implementation should be designed to call
+ * this function multiple times until it has received the required amount of
+ * entropy from the entropy source.
+ * 
+ * \param[in,out] p_context                 A hardware-specific structure
+ *                                          containing any context information
+ *                                          for the implementation
+ * \param[out] p_buffer                     A caller-allocated buffer for the
+ *                                          retrieved entropy to be placed in
+ * \param[in] buffer_size                   The allocated size of `p_buffer`
+ * \param[out] p_received_entropy_bits      The amount of entropy (in bits)
+ *                                          actually provided in `p_buffer`
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_entropy_get_bits_t)(pcd_entropy_context_t *p_context,
+                                               uint8_t *p_buffer,
+                                               uint32_t buffer_size,
+                                               uint32_t *p_received_entropy_bits);
+
+/**
+ * \brief A struct containing all of the function pointers needed to interface
+ * to an entropy source
+ * 
+ * PSA Crypto API implementations should populate instances of the table as
+ * appropriate upon startup.
+ * 
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct pcd_entropy_t {
+    /** Function that performs initialization for the entropy source */
+    pcd_entropy_init_t *p_init;
+    /** Function that performs the get_bits operation for the entropy source
+    */
+    pcd_entropy_get_bits_t *p_get_bits;
+};
+/**@}*/
+
+/** \defgroup driver_key_management Key Management
+ * Currently, key management is limited to importing keys in the clear,
+ * destroying keys, and exporting keys in the clear.
+ * Whether a key may be exported is determined by the key policies in place
+ * on the key slot.
+ */
+/**@{*/
+
+/** \brief Import a key in binary format
+ *
+ * This function can support any output from psa_export_key(). Refer to the
+ * documentation of psa_export_key() for the format for each key type.
+ *
+ * \param[in] key_slot      Slot where the key will be stored
+ *                          This must be a valid slot for a key of the chosen
+ *                          type. It must be unoccupied.
+ * \param[in] type          Key type (a \c PSA_KEY_TYPE_XXX value)
+ * \param[in] algorithm     Key algorithm (a \c PSA_ALG_XXX value)
+ * \param[in] usage         The allowed uses of the key
+ * \param[in] p_data        Buffer containing the key data
+ * \param[in] data_length   Size of the `data` buffer in bytes
+ *
+ * \retval #PSA_SUCCESS
+ *         Success.
+ */
+typedef psa_status_t (*pcd_opaque_import_key_t)(psa_key_slot_t key_slot,
+                                                psa_key_type_t type,
+                                                psa_algorithm_t algorithm,
+                                                psa_key_usage_t usage,
+                                                const uint8_t *p_data,
+                                                size_t data_length);
+
+/**
+ * \brief Destroy a key and restore the slot to its default state
+ *
+ * This function destroys the content of the key slot from both volatile
+ * memory and, if applicable, non-volatile storage. Implementations shall
+ * make a best effort to ensure that any previous content of the slot is
+ * unrecoverable.
+ *
+ * This function also erases any metadata such as policies. It returns the
+ * specified slot to its default state.
+ *
+ * \param[in] key_slot        The key slot to erase.
+ *
+ * \retval #PSA_SUCCESS
+ *         The slot's content, if any, has been erased.
+ */
+typedef psa_status_t (*pcd_destroy_key_t)(psa_key_slot_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 a key is created with `psa_import_key()` and then exported with
+ * this function, it is not guaranteed that the resulting data is
+ * identical: the implementation may choose a different representation
+ * of the same key if the format permits it.
+ *
+ * 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_KEYPAIR), the format
+ *   is the non-encrypted DER representation defined by PKCS\#1 (RFC 8017)
+ *   as RSAPrivateKey.
+ * - For RSA public keys (#PSA_KEY_TYPE_RSA_PUBLIC_KEY), the format
+ *   is the DER representation defined by RFC 5280 as SubjectPublicKeyInfo.
+ *
+ * \param[in] key               Slot whose content is to be exported. This must
+ *                              be an occupied key slot.
+ * \param[out] p_data           Buffer where the key data is to be written.
+ * \param[in] data_size         Size of the `p_data` buffer in bytes.
+ * \param[out] p_data_length    On success, the number of bytes
+ *                              that make up the key data.
+ *
+ * \retval #PSA_SUCCESS
+ * \retval #PSA_ERROR_EMPTY_SLOT
+ * \retval #PSA_ERROR_NOT_PERMITTED
+ * \retval #PSA_ERROR_NOT_SUPPORTED
+ * \retval #PSA_ERROR_COMMUNICATION_FAILURE
+ * \retval #PSA_ERROR_HARDWARE_FAILURE
+ * \retval #PSA_ERROR_TAMPERING_DETECTED
+ */
+typedef psa_status_t (*pcd_export_key_t)(psa_key_slot_t key,
+                                         uint8_t *p_data,
+                                         size_t data_size,
+                                         size_t *p_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.
+ *
+ * For standard key types, the output format is as follows:
+ *
+ * - For RSA keys (#PSA_KEY_TYPE_RSA_KEYPAIR or #PSA_KEY_TYPE_RSA_PUBLIC_KEY),
+ *   the format is the DER representation of the public key defined by RFC 5280
+ *   as SubjectPublicKeyInfo.
+ *
+ * \param[in] key_slot          Slot whose content is to be exported. This must
+ *                              be an occupied key slot.
+ * \param[out] p_data           Buffer where the key data is to be written.
+ * \param[in] data_size         Size of the `data` buffer in bytes.
+ * \param[out] p_data_length    On success, the number of bytes
+ *                              that make up the key data.
+ *
+ * \retval #PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_export_public_key_t)(psa_key_slot_t key,
+                                                uint8_t *p_data,
+                                                size_t data_size,
+                                                size_t *p_data_length);
+
+/**
+ * \brief A struct containing all of the function pointers needed to for key
+ * management using opaque keys
+ * 
+ * PSA Crypto API implementations should populate instances of the table as
+ * appropriate upon startup.
+ * 
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct pcd_key_management_t {
+    /** Function that performs the key import operation */
+    pcd_opaque_import_key_t *p_import;
+    /** Function that performs the key destroy operation */
+    pcd_destroy_key_t       *p_destroy;
+    /** Function that performs the key export operation */
+    pcd_export_key_t        *p_export;
+    /** Function that perforsm the public key export operation */
+    pcd_export_public_key_t *p_export_public;
+};
+
+/**@}*/
+
+/** \defgroup driver_derivation Key Derivation and Agreement
+ * Key derivation is the process of generating new key material using an
+ * existing key and additional parameters, iterating through a basic
+ * cryptographic function, such as a hash.
+ * Key agreement is a part of cryptographic protocols that allows two parties
+ * to agree on the same key value, but starting from different original key
+ * material.
+ * The flows are similar, and the PSA Crypto Driver API uses the same functions
+ * for both of the flows.
+ * 
+ * There are two different final functions for the flows,
+ * `pcd_key_derivation_derive` and `pcd_key_derivation_export`.
+ * `pcd_key_derivation_derive` is used when the key material should be placed
+ * in a slot on the hardware and not exposed to the caller.
+ * `pcd_key_derivation_export` is used when the key material should be returned
+ * to the PSA Cryptographic API implementation.
+ * 
+ * Different key derivation algorithms require a different number of inputs.
+ * Instead of having an API that takes as input variable length arrays, which
+ * can be problemmatic to manage on embedded platforms, the inputs are passed
+ * to the driver via a function, `pcd_key_derivation_collateral`, that is
+ * called multiple times with different `collateral_id`s. Thus, for a key
+ * derivation algorithm that required 3 paramter inputs, the flow would look
+ * something like:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_key_derivation_setup(kdf_algorithm, source_key, dest_key_size_bytes);
+ * pcd_key_derivation_collateral(kdf_algorithm_collateral_id_0,
+ *                               p_collateral_0,
+ *                               collateral_0_size);
+ * pcd_key_derivation_collateral(kdf_algorithm_collateral_id_1,
+ *                               p_collateral_1,
+ *                               collateral_1_size);
+ * pcd_key_derivation_collateral(kdf_algorithm_collateral_id_2,
+ *                               p_collateral_2,
+ *                               collateral_2_size);
+ * pcd_key_derivation_derive();
+ * ~~~~~~~~~~~~~
+ * 
+ * key agreement example:
+ * ~~~~~~~~~~~~~{.c}
+ * pcd_key_derivation_setup(alg, source_key. dest_key_size_bytes);
+ * pcd_key_derivation_collateral(DHE_PUBKEY, p_pubkey, pubkey_size);
+ * pcd_key_derivation_export(p_session_key,
+ *                           session_key_size,
+ *                           &session_key_length);
+ * ~~~~~~~~~~~~~
+ */
+/**@{*/
+
+/** \brief The hardware-specific key derivation context structure
+ * 
+ * The contents of this structure are implementation dependent and are
+ * therefore not described here
+ */
+typedef struct pcd_key_derivation_context_s pcd_key_derivation_context_t;
+
+/** \brief Set up a key derivation operation by specifying the algorithm and
+ * the source key sot
+ * 
+ * \param[in,out] p_context A hardware-specific structure containing any
+ *                          context information for the implementation
+ * \param[in] kdf_alg       The algorithm to be used for the key derivation
+ * \param[in] souce_key     The key to be used as the source material for the
+ *                          key derivation
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_key_derivation_setup_t)(pcd_key_derivation_context_t *p_context,
+                                                   psa_algorithm_t kdf_alg,
+                                                   psa_key_slot_t source_key);
+
+/** \brief Provide collateral (parameters) needed for a key derivation or key
+ * agreement operation
+ * 
+ * Since many key derivation algorithms require multiple parameters, it is
+ * expeced that this function may be called multiple times for the same
+ * operation, each with a different algorithm-specific `collateral_id`
+ * 
+ * \param[in,out] p_context     A hardware-specific structure containing any
+ *                              context information for the implementation
+ * \param[in] collateral_id     An ID for the collateral being provided
+ * \param[in] p_collateral      A buffer containing the collateral data
+ * \param[in] collateral_size   The size in bytes of the collateral
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_key_derivation_collateral_t)(pcd_key_derivation_context_t *p_context,
+                                                         uint32_t collateral_id,
+                                                         const uint8_t *p_collateral,
+                                                         size_t collateral_size);
+
+/** \brief Perform the final key derivation step and place the generated key
+ * material in a slot
+ * \param[in,out] p_context     A hardware-specific structure containing any
+ *                              context information for the implementation
+ * \param[in] dest_key          The slot where the generated key material
+ *                              should be placed
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_key_derivation_derive_t)(pcd_key_derivation_context_t *p_context,
+                                                    psa_key_slot_t dest_key);
+
+/** \brief Perform the final step of a key agreement and place the generated
+ * key material in a buffer
+ * 
+ * \param[out] p_output         Buffer in which to place the generated key
+ *                              material
+ * \param[in] output_size       The size in bytes of `p_output`
+ * \param[out] p_output_length  Upon success, contains the number of bytes of
+ *                              key material placed in `p_output`
+ * 
+ * \retval PSA_SUCCESS
+ */
+typedef psa_status_t (*pcd_key_derivation_export_t)(uint8_t *p_output,
+                                                    size_t output_size,
+                                                    size_t *p_output_length);
+
+/**
+ * \brief A struct containing all of the function pointers needed to for key
+ * derivation and agreement
+ * 
+ * PSA Crypto API implementations should populate instances of the table as
+ * appropriate upon startup.
+ * 
+ * If one of the functions is not implemented, it should be set to NULL.
+ */
+struct pcd_key_derivation_t {
+    /** Function that performs the key derivation setup */
+    pcd_key_derivation_setup_t      *p_setup;
+    /** Function that sets the key derivation collateral */
+    pcd_key_derivation_collateral_t *p_collateral;
+    /** Function that performs the final key derivation step */
+    pcd_key_derivation_derive_t     *p_derive;
+    /** Function that perforsm the final key derivation or agreement and
+     * exports the key */
+    pcd_key_derivation_export_t     *p_export;
+};
+
+/**@}*/
+
+#endif // __PSA_CRYPTO_DRIVER_H__
\ No newline at end of file