diff --git a/docs/architecture/tls13-experimental.md b/docs/architecture/tls13-experimental.md
index bcf3e34..3db16e0 100644
--- a/docs/architecture/tls13-experimental.md
+++ b/docs/architecture/tls13-experimental.md
@@ -38,3 +38,12 @@
 - The HKDF key derivation function on which the TLS 1.3 key schedule is based,
   is already present as an independent module controlled by `MBEDTLS_HKDF_C`
   independently of the development of the TLS 1.3 prototype.
+
+- The TLS 1.3-specific HKDF-based key derivation functions (see RFC 8446):
+  * HKDF-Expand-Label
+  * Derive-Secret
+  - Secret evolution
+  * The traffic {Key,IV} generation from secret
+  Those functions are implemented in `library/ssl_tls13_keys.c` and
+  tested in `test_suite_ssl` using test vectors from RFC 8448 and
+  https://tls13.ulfheim.net/.
diff --git a/include/mbedtls/cipher.h b/include/mbedtls/cipher.h
index 014786a..8827e0b 100644
--- a/include/mbedtls/cipher.h
+++ b/include/mbedtls/cipher.h
@@ -227,10 +227,30 @@
 };
 
 /** Maximum length of any IV, in Bytes. */
+/* This should ideally be derived automatically from list of ciphers.
+ * This should be kept in sync with MBEDTLS_SSL_MAX_IV_LENGTH defined
+ * in ssl_internal.h. */
 #define MBEDTLS_MAX_IV_LENGTH      16
+
 /** Maximum block size of any cipher, in Bytes. */
+/* This should ideally be derived automatically from list of ciphers.
+ * This should be kept in sync with MBEDTLS_SSL_MAX_BLOCK_LENGTH defined
+ * in ssl_internal.h. */
 #define MBEDTLS_MAX_BLOCK_LENGTH   16
 
+/** Maximum key length, in Bytes. */
+/* This should ideally be derived automatically from list of ciphers.
+ * For now, only check whether XTS is enabled which uses 64 Byte keys,
+ * and use 32 Bytes as an upper bound for the maximum key length otherwise.
+ * This should be kept in sync with MBEDTLS_SSL_MAX_BLOCK_LENGTH defined
+ * in ssl_internal.h, which however deliberately ignores the case of XTS
+ * since the latter isn't used in SSL/TLS. */
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+#define MBEDTLS_MAX_KEY_LENGTH     64
+#else
+#define MBEDTLS_MAX_KEY_LENGTH     32
+#endif /* MBEDTLS_CIPHER_MODE_XTS */
+
 /**
  * Base cipher information (opaque struct).
  */
diff --git a/include/mbedtls/ssl_internal.h b/include/mbedtls/ssl_internal.h
index b3d53d3..7b78c73 100644
--- a/include/mbedtls/ssl_internal.h
+++ b/include/mbedtls/ssl_internal.h
@@ -378,6 +378,49 @@
                                      const char *label,
                                      const unsigned char *random, size_t rlen,
                                      unsigned char *dstbuf, size_t dlen );
+
+/* cipher.h exports the maximum IV, key and block length from
+ * all ciphers enabled in the config, regardless of whether those
+ * ciphers are actually usable in SSL/TLS. Notably, XTS is enabled
+ * in the default configuration and uses 64 Byte keys, but it is
+ * not used for record protection in SSL/TLS.
+ *
+ * In order to prevent unnecessary inflation of key structures,
+ * we introduce SSL-specific variants of the max-{key,block,IV}
+ * macros here which are meant to only take those ciphers into
+ * account which can be negotiated in SSL/TLS.
+ *
+ * Since the current definitions of MBEDTLS_MAX_{KEY|BLOCK|IV}_LENGTH
+ * in cipher.h are rough overapproximations of the real maxima, here
+ * we content ourselves with replicating those overapproximations
+ * for the maximum block and IV length, and excluding XTS from the
+ * computation of the maximum key length. */
+#define MBEDTLS_SSL_MAX_BLOCK_LENGTH 16
+#define MBEDTLS_SSL_MAX_IV_LENGTH    16
+#define MBEDTLS_SSL_MAX_KEY_LENGTH   32
+
+/**
+ * \brief   The data structure holding the cryptographic material (key and IV)
+ *          used for record protection in TLS 1.3.
+ */
+struct mbedtls_ssl_key_set
+{
+    /*! The key for client->server records. */
+    unsigned char client_write_key[ MBEDTLS_SSL_MAX_KEY_LENGTH ];
+    /*! The key for server->client records. */
+    unsigned char server_write_key[ MBEDTLS_SSL_MAX_KEY_LENGTH ];
+    /*! The IV  for client->server records. */
+    unsigned char client_write_iv[ MBEDTLS_SSL_MAX_IV_LENGTH ];
+    /*! The IV  for server->client records. */
+    unsigned char server_write_iv[ MBEDTLS_SSL_MAX_IV_LENGTH ];
+
+    size_t key_len; /*!< The length of client_write_key and
+                     *   server_write_key, in Bytes. */
+    size_t iv_len;  /*!< The length of client_write_iv and
+                     *   server_write_iv, in Bytes. */
+};
+typedef struct mbedtls_ssl_key_set mbedtls_ssl_key_set;
+
 /*
  * This structure contains the parameters only needed during handshake.
  */
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 91ac8bc..4444b98 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -104,6 +104,7 @@
     ssl_srv.c
     ssl_ticket.c
     ssl_tls.c
+    ssl_tls13_keys.c
 )
 
 if(CMAKE_COMPILER_IS_GNUCC)
diff --git a/library/Makefile b/library/Makefile
index c7d4a06..a6db9b3 100644
--- a/library/Makefile
+++ b/library/Makefile
@@ -163,6 +163,7 @@
 	  ssl_srv.o \
 	  ssl_ticket.o \
 	  ssl_tls.o \
+	  ssl_tls13_keys.o \
 	  # This line is intentionally left blank
 
 .SILENT:
diff --git a/library/ssl_tls13_keys.c b/library/ssl_tls13_keys.c
new file mode 100644
index 0000000..c39e032
--- /dev/null
+++ b/library/ssl_tls13_keys.c
@@ -0,0 +1,349 @@
+/*
+ *  TLS 1.3 key schedule
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  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.
+ */
+
+#include "common.h"
+
+#if defined(MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL)
+
+#include "mbedtls/hkdf.h"
+#include "mbedtls/ssl_internal.h"
+#include "ssl_tls13_keys.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#define MBEDTLS_SSL_TLS1_3_LABEL( name, string )       \
+    .name = string,
+
+struct mbedtls_ssl_tls1_3_labels_struct const mbedtls_ssl_tls1_3_labels =
+{
+    /* This seems to work in C, despite the string literal being one
+     * character too long due to the 0-termination. */
+    MBEDTLS_SSL_TLS1_3_LABEL_LIST
+};
+
+#undef MBEDTLS_SSL_TLS1_3_LABEL
+
+/*
+ * This function creates a HkdfLabel structure used in the TLS 1.3 key schedule.
+ *
+ * The HkdfLabel is specified in RFC 8446 as follows:
+ *
+ * struct HkdfLabel {
+ *   uint16 length;            // Length of expanded key material
+ *   opaque label<7..255>;     // Always prefixed by "tls13 "
+ *   opaque context<0..255>;   // Usually a communication transcript hash
+ * };
+ *
+ * Parameters:
+ * - desired_length: Length of expanded key material
+ *                   Even though the standard allows expansion to up to
+ *                   2**16 Bytes, TLS 1.3 never uses expansion to more than
+ *                   255 Bytes, so we require `desired_length` to be at most
+ *                   255. This allows us to save a few Bytes of code by
+ *                   hardcoding the writing of the high bytes.
+ * - (label, llen): label + label length, without "tls13 " prefix
+ *                  The label length MUST be less than or equal to
+ *                  MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_LABEL_LEN
+ *                  It is the caller's responsibility to ensure this.
+ *                  All (label, label length) pairs used in TLS 1.3
+ *                  can be obtained via MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN().
+ * - (ctx, clen): context + context length
+ *                The context length MUST be less than or equal to
+ *                MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_CONTEXT_LEN
+ *                It is the caller's responsibility to ensure this.
+ * - dst: Target buffer for HkdfLabel structure,
+ *        This MUST be a writable buffer of size
+ *        at least SSL_TLS1_3_KEY_SCHEDULE_MAX_HKDF_LABEL_LEN Bytes.
+ * - dlen: Pointer at which to store the actual length of
+ *         the HkdfLabel structure on success.
+ */
+
+static const char tls1_3_label_prefix[6] = "tls13 ";
+
+#define SSL_TLS1_3_KEY_SCHEDULE_HKDF_LABEL_LEN( label_len, context_len ) \
+    (   2                  /* expansion length           */ \
+      + 1                  /* label length               */ \
+      + label_len                                           \
+      + 1                  /* context length             */ \
+      + context_len )
+
+#define SSL_TLS1_3_KEY_SCHEDULE_MAX_HKDF_LABEL_LEN                      \
+    SSL_TLS1_3_KEY_SCHEDULE_HKDF_LABEL_LEN(                             \
+                     sizeof(tls1_3_label_prefix) +                      \
+                     MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_LABEL_LEN,     \
+                     MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_CONTEXT_LEN )
+
+static void ssl_tls1_3_hkdf_encode_label(
+                            size_t desired_length,
+                            const unsigned char *label, size_t llen,
+                            const unsigned char *ctx, size_t clen,
+                            unsigned char *dst, size_t *dlen )
+{
+    size_t total_label_len =
+        sizeof(tls1_3_label_prefix) + llen;
+    size_t total_hkdf_lbl_len =
+        SSL_TLS1_3_KEY_SCHEDULE_HKDF_LABEL_LEN( total_label_len, clen );
+
+    unsigned char *p = dst;
+
+    /* Add the size of the expanded key material.
+     * We're hardcoding the high byte to 0 here assuming that we never use
+     * TLS 1.3 HKDF key expansion to more than 255 Bytes. */
+#if MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN > 255
+#error "The implementation of ssl_tls1_3_hkdf_encode_label() is not fit for the \
+        value of MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN"
+#endif
+
+    *p++ = 0;
+    *p++ = (unsigned char)( ( desired_length >> 0 ) & 0xFF );
+
+    /* Add label incl. prefix */
+    *p++ = (unsigned char)( total_label_len & 0xFF );
+    memcpy( p, tls1_3_label_prefix, sizeof(tls1_3_label_prefix) );
+    p += sizeof(tls1_3_label_prefix);
+    memcpy( p, label, llen );
+    p += llen;
+
+    /* Add context value */
+    *p++ = (unsigned char)( clen & 0xFF );
+    if( clen != 0 )
+        memcpy( p, ctx, clen );
+
+    /* Return total length to the caller.  */
+    *dlen = total_hkdf_lbl_len;
+}
+
+int mbedtls_ssl_tls1_3_hkdf_expand_label(
+                     mbedtls_md_type_t hash_alg,
+                     const unsigned char *secret, size_t slen,
+                     const unsigned char *label, size_t llen,
+                     const unsigned char *ctx, size_t clen,
+                     unsigned char *buf, size_t blen )
+{
+    const mbedtls_md_info_t *md;
+    unsigned char hkdf_label[ SSL_TLS1_3_KEY_SCHEDULE_MAX_HKDF_LABEL_LEN ];
+    size_t hkdf_label_len;
+
+    if( llen > MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_LABEL_LEN )
+    {
+        /* Should never happen since this is an internal
+         * function, and we know statically which labels
+         * are allowed. */
+        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+    }
+
+    if( clen > MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_CONTEXT_LEN )
+    {
+        /* Should not happen, as above. */
+        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+    }
+
+    if( blen > MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN )
+    {
+        /* Should not happen, as above. */
+        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+    }
+
+    md = mbedtls_md_info_from_type( hash_alg );
+    if( md == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+    ssl_tls1_3_hkdf_encode_label( blen,
+                                  label, llen,
+                                  ctx, clen,
+                                  hkdf_label,
+                                  &hkdf_label_len );
+
+    return( mbedtls_hkdf_expand( md,
+                                 secret, slen,
+                                 hkdf_label, hkdf_label_len,
+                                 buf, blen ) );
+}
+
+/*
+ * The traffic keying material is generated from the following inputs:
+ *
+ *  - One secret value per sender.
+ *  - A purpose value indicating the specific value being generated
+ *  - The desired lengths of key and IV.
+ *
+ * The expansion itself is based on HKDF:
+ *
+ *   [sender]_write_key = HKDF-Expand-Label( Secret, "key", "", key_length )
+ *   [sender]_write_iv  = HKDF-Expand-Label( Secret, "iv" , "", iv_length )
+ *
+ * [sender] denotes the sending side and the Secret value is provided
+ * by the function caller. Note that we generate server and client side
+ * keys in a single function call.
+ */
+int mbedtls_ssl_tls1_3_make_traffic_keys(
+                     mbedtls_md_type_t hash_alg,
+                     const unsigned char *client_secret,
+                     const unsigned char *server_secret,
+                     size_t slen, size_t key_len, size_t iv_len,
+                     mbedtls_ssl_key_set *keys )
+{
+    int ret = 0;
+
+    ret = mbedtls_ssl_tls1_3_hkdf_expand_label( hash_alg,
+                    client_secret, slen,
+                    MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( key ),
+                    NULL, 0,
+                    keys->client_write_key, key_len );
+    if( ret != 0 )
+        return( ret );
+
+    ret = mbedtls_ssl_tls1_3_hkdf_expand_label( hash_alg,
+                    server_secret, slen,
+                    MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( key ),
+                    NULL, 0,
+                    keys->server_write_key, key_len );
+    if( ret != 0 )
+        return( ret );
+
+    ret = mbedtls_ssl_tls1_3_hkdf_expand_label( hash_alg,
+                    client_secret, slen,
+                    MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( iv ),
+                    NULL, 0,
+                    keys->client_write_iv, iv_len );
+    if( ret != 0 )
+        return( ret );
+
+    ret = mbedtls_ssl_tls1_3_hkdf_expand_label( hash_alg,
+                    server_secret, slen,
+                    MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( iv ),
+                    NULL, 0,
+                    keys->server_write_iv, iv_len );
+    if( ret != 0 )
+        return( ret );
+
+    keys->key_len = key_len;
+    keys->iv_len = iv_len;
+
+    return( 0 );
+}
+
+int mbedtls_ssl_tls1_3_derive_secret(
+                   mbedtls_md_type_t hash_alg,
+                   const unsigned char *secret, size_t slen,
+                   const unsigned char *label, size_t llen,
+                   const unsigned char *ctx, size_t clen,
+                   int ctx_hashed,
+                   unsigned char *dstbuf, size_t buflen )
+{
+    int ret;
+    unsigned char hashed_context[ MBEDTLS_MD_MAX_SIZE ];
+
+    const mbedtls_md_info_t *md;
+    md = mbedtls_md_info_from_type( hash_alg );
+    if( md == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+    if( ctx_hashed == MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED )
+    {
+        ret = mbedtls_md( md, ctx, clen, hashed_context );
+        if( ret != 0 )
+            return( ret );
+        clen = mbedtls_md_get_size( md );
+    }
+    else
+    {
+        if( clen > sizeof(hashed_context) )
+        {
+            /* This should never happen since this function is internal
+             * and the code sets `ctx_hashed` correctly.
+             * Let's double-check nonetheless to not run at the risk
+             * of getting a stack overflow. */
+            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
+        }
+
+        memcpy( hashed_context, ctx, clen );
+    }
+
+    return( mbedtls_ssl_tls1_3_hkdf_expand_label( hash_alg,
+                                                  secret, slen,
+                                                  label, llen,
+                                                  hashed_context, clen,
+                                                  dstbuf, buflen ) );
+}
+
+int mbedtls_ssl_tls1_3_evolve_secret(
+                   mbedtls_md_type_t hash_alg,
+                   const unsigned char *secret_old,
+                   const unsigned char *input, size_t input_len,
+                   unsigned char *secret_new )
+{
+    int ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
+    size_t hlen, ilen;
+    unsigned char tmp_secret[ MBEDTLS_MD_MAX_SIZE ] = { 0 };
+    unsigned char tmp_input [ MBEDTLS_MD_MAX_SIZE ] = { 0 };
+
+    const mbedtls_md_info_t *md;
+    md = mbedtls_md_info_from_type( hash_alg );
+    if( md == NULL )
+        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
+
+    hlen = mbedtls_md_get_size( md );
+
+    /* For non-initial runs, call Derive-Secret( ., "derived", "")
+     * on the old secret. */
+    if( secret_old != NULL )
+    {
+        ret = mbedtls_ssl_tls1_3_derive_secret(
+                   hash_alg,
+                   secret_old, hlen,
+                   MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( derived ),
+                   NULL, 0, /* context */
+                   MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED,
+                   tmp_secret, hlen );
+        if( ret != 0 )
+            goto cleanup;
+    }
+
+    if( input != NULL )
+    {
+        memcpy( tmp_input, input, input_len );
+        ilen = input_len;
+    }
+    else
+    {
+        ilen = hlen;
+    }
+
+    /* HKDF-Extract takes a salt and input key material.
+     * The salt is the old secret, and the input key material
+     * is the input secret (PSK / ECDHE). */
+    ret = mbedtls_hkdf_extract( md,
+                    tmp_secret, hlen,
+                    tmp_input, ilen,
+                    secret_new );
+    if( ret != 0 )
+        goto cleanup;
+
+    ret = 0;
+
+ cleanup:
+
+    mbedtls_platform_zeroize( tmp_secret, sizeof(tmp_secret) );
+    mbedtls_platform_zeroize( tmp_input,  sizeof(tmp_input)  );
+    return( ret );
+}
+
+#endif /* MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
diff --git a/library/ssl_tls13_keys.h b/library/ssl_tls13_keys.h
new file mode 100644
index 0000000..7089049
--- /dev/null
+++ b/library/ssl_tls13_keys.h
@@ -0,0 +1,274 @@
+/*
+ *  TLS 1.3 key schedule
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  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.
+ */
+#if !defined(MBEDTLS_SSL_TLS1_3_KEYS_H)
+#define MBEDTLS_SSL_TLS1_3_KEYS_H
+
+/* This requires MBEDTLS_SSL_TLS1_3_LABEL( idx, name, string ) to be defined at
+ * the point of use. See e.g. the definition of mbedtls_ssl_tls1_3_labels_union
+ * below. */
+#define MBEDTLS_SSL_TLS1_3_LABEL_LIST                               \
+    MBEDTLS_SSL_TLS1_3_LABEL( finished    , "finished"     ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( resumption  , "resumption"   ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( traffic_upd , "traffic upd"  ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( exporter    , "exporter"     ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( key         , "key"          ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( iv          , "iv"           ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( c_hs_traffic, "c hs traffic" ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( c_ap_traffic, "c ap traffic" ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( c_e_traffic , "c e traffic"  ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( s_hs_traffic, "s hs traffic" ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( s_ap_traffic, "s ap traffic" ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( s_e_traffic , "s e traffic"  ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( e_exp_master, "e exp master" ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( res_master  , "res master"   ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( exp_master  , "exp master"   ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( ext_binder  , "ext binder"   ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( res_binder  , "res binder"   ) \
+    MBEDTLS_SSL_TLS1_3_LABEL( derived     , "derived"      )
+
+#define MBEDTLS_SSL_TLS1_3_LABEL( name, string )       \
+    const unsigned char name    [ sizeof(string) - 1 ];
+
+union mbedtls_ssl_tls1_3_labels_union
+{
+    MBEDTLS_SSL_TLS1_3_LABEL_LIST
+};
+struct mbedtls_ssl_tls1_3_labels_struct
+{
+    MBEDTLS_SSL_TLS1_3_LABEL_LIST
+};
+#undef MBEDTLS_SSL_TLS1_3_LABEL
+
+extern const struct mbedtls_ssl_tls1_3_labels_struct mbedtls_ssl_tls1_3_labels;
+
+#define MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN( LABEL )  \
+    mbedtls_ssl_tls1_3_labels.LABEL,              \
+    sizeof(mbedtls_ssl_tls1_3_labels.LABEL)
+
+#define MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_LABEL_LEN  \
+    sizeof( union mbedtls_ssl_tls1_3_labels_union )
+
+/* The maximum length of HKDF contexts used in the TLS 1.3 standard.
+ * Since contexts are always hashes of message transcripts, this can
+ * be approximated from above by the maximum hash size. */
+#define MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_CONTEXT_LEN  \
+    MBEDTLS_MD_MAX_SIZE
+
+/* Maximum desired length for expanded key material generated
+ * by HKDF-Expand-Label.
+ *
+ * Warning: If this ever needs to be increased, the implementation
+ * ssl_tls1_3_hkdf_encode_label() in ssl_tls13_keys.c needs to be
+ * adjusted since it currently assumes that HKDF key expansion
+ * is never used with more than 255 Bytes of output. */
+#define MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN 255
+
+/**
+ * \brief           The \c HKDF-Expand-Label function from
+ *                  the TLS 1.3 standard RFC 8446.
+ *
+ * <tt>
+ *                  HKDF-Expand-Label( Secret, Label, Context, Length ) =
+ *                       HKDF-Expand( Secret, HkdfLabel, Length )
+ * </tt>
+ *
+ * \param hash_alg  The identifier for the hash algorithm to use.
+ * \param secret    The \c Secret argument to \c HKDF-Expand-Label.
+ *                  This must be a readable buffer of length \p slen Bytes.
+ * \param slen      The length of \p secret in Bytes.
+ * \param label     The \c Label argument to \c HKDF-Expand-Label.
+ *                  This must be a readable buffer of length \p llen Bytes.
+ * \param llen      The length of \p label in Bytes.
+ * \param ctx       The \c Context argument to \c HKDF-Expand-Label.
+ *                  This must be a readable buffer of length \p clen Bytes.
+ * \param clen      The length of \p context in Bytes.
+ * \param buf       The destination buffer to hold the expanded secret.
+ *                  This must be a writable buffer of length \p blen Bytes.
+ * \param blen      The desired size of the expanded secret in Bytes.
+ *
+ * \returns         \c 0 on success.
+ * \return          A negative error code on failure.
+ */
+
+int mbedtls_ssl_tls1_3_hkdf_expand_label(
+                     mbedtls_md_type_t hash_alg,
+                     const unsigned char *secret, size_t slen,
+                     const unsigned char *label, size_t llen,
+                     const unsigned char *ctx, size_t clen,
+                     unsigned char *buf, size_t blen );
+
+/**
+ * \brief           This function is part of the TLS 1.3 key schedule.
+ *                  It extracts key and IV for the actual client/server traffic
+ *                  from the client/server traffic secrets.
+ *
+ * From RFC 8446:
+ *
+ * <tt>
+ *   [sender]_write_key = HKDF-Expand-Label(Secret, "key", "", key_length)
+ *   [sender]_write_iv  = HKDF-Expand-Label(Secret, "iv", "", iv_length)*
+ * </tt>
+ *
+ * \param hash_alg      The identifier for the hash algorithm to be used
+ *                      for the HKDF-based expansion of the secret.
+ * \param client_secret The client traffic secret.
+ *                      This must be a readable buffer of size \p slen Bytes
+ * \param server_secret The server traffic secret.
+ *                      This must be a readable buffer of size \p slen Bytes
+ * \param slen          Length of the secrets \p client_secret and
+ *                      \p server_secret in Bytes.
+ * \param key_len       The desired length of the key to be extracted in Bytes.
+ * \param iv_len        The desired length of the IV to be extracted in Bytes.
+ * \param keys          The address of the structure holding the generated
+ *                      keys and IVs.
+ *
+ * \returns             \c 0 on success.
+ * \returns             A negative error code on failure.
+ */
+
+int mbedtls_ssl_tls1_3_make_traffic_keys(
+                     mbedtls_md_type_t hash_alg,
+                     const unsigned char *client_secret,
+                     const unsigned char *server_secret,
+                     size_t slen, size_t key_len, size_t iv_len,
+                     mbedtls_ssl_key_set *keys );
+
+
+#define MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED 0
+#define MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED   1
+
+/**
+ * \brief The \c Derive-Secret function from the TLS 1.3 standard RFC 8446.
+ *
+ * <tt>
+ *   Derive-Secret( Secret, Label, Messages ) =
+ *      HKDF-Expand-Label( Secret, Label,
+ *                         Hash( Messages ),
+ *                         Hash.Length ) )
+ * </tt>
+ *
+ * \param hash_alg   The identifier for the hash function used for the
+ *                   applications of HKDF.
+ * \param secret     The \c Secret argument to the \c Derive-Secret function.
+ *                   This must be a readable buffer of length \p slen Bytes.
+ * \param slen       The length of \p secret in Bytes.
+ * \param label      The \c Label argument to the \c Derive-Secret function.
+ *                   This must be a readable buffer of length \p llen Bytes.
+ * \param llen       The length of \p label in Bytes.
+ * \param ctx        The hash of the \c Messages argument to the
+ *                   \c Derive-Secret function, or the \c Messages argument
+ *                   itself, depending on \p context_already_hashed.
+ * \param clen       The length of \p hash.
+ * \param ctx_hashed This indicates whether the \p ctx contains the hash of
+ *                   the \c Messages argument in the application of the
+ *                   \c Derive-Secret function
+ *                   (value MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED), or whether
+ *                   it is the content of \c Messages itself, in which case
+ *                   the function takes care of the hashing
+ *                   (value MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED).
+ * \param dstbuf     The target buffer to write the output of
+ *                   \c Derive-Secret to. This must be a writable buffer of
+ *                   size \p buflen Bytes.
+ * \param buflen     The length of \p dstbuf in Bytes.
+ *
+ * \returns        \c 0 on success.
+ * \returns        A negative error code on failure.
+ */
+int mbedtls_ssl_tls1_3_derive_secret(
+                   mbedtls_md_type_t hash_alg,
+                   const unsigned char *secret, size_t slen,
+                   const unsigned char *label, size_t llen,
+                   const unsigned char *ctx, size_t clen,
+                   int ctx_hashed,
+                   unsigned char *dstbuf, size_t buflen );
+
+/**
+ * \brief Compute the next secret in the TLS 1.3 key schedule
+ *
+ * The TLS 1.3 key schedule proceeds as follows to compute
+ * the three main secrets during the handshake: The early
+ * secret for early data, the handshake secret for all
+ * other encrypted handshake messages, and the master
+ * secret for all application traffic.
+ *
+ * <tt>
+ *                    0
+ *                    |
+ *                    v
+ *     PSK ->  HKDF-Extract = Early Secret
+ *                    |
+ *                    v
+ *     Derive-Secret( ., "derived", "" )
+ *                    |
+ *                    v
+ *  (EC)DHE -> HKDF-Extract = Handshake Secret
+ *                    |
+ *                    v
+ *     Derive-Secret( ., "derived", "" )
+ *                    |
+ *                    v
+ *     0 -> HKDF-Extract = Master Secret
+ * </tt>
+ *
+ * Each of the three secrets in turn is the basis for further
+ * key derivations, such as the derivation of traffic keys and IVs;
+ * see e.g. mbedtls_ssl_tls1_3_make_traffic_keys().
+ *
+ * This function implements one step in this evolution of secrets:
+ *
+ * <tt>
+ *                old_secret
+ *                    |
+ *                    v
+ *     Derive-Secret( ., "derived", "" )
+ *                    |
+ *                    v
+ *     input -> HKDF-Extract = new_secret
+ * </tt>
+ *
+ * \param hash_alg    The identifier for the hash function used for the
+ *                    applications of HKDF.
+ * \param secret_old  The address of the buffer holding the old secret
+ *                    on function entry. If not \c NULL, this must be a
+ *                    readable buffer whose size matches the output size
+ *                    of the hash function represented by \p hash_alg.
+ *                    If \c NULL, an all \c 0 array will be used instead.
+ * \param input       The address of the buffer holding the additional
+ *                    input for the key derivation (e.g., the PSK or the
+ *                    ephemeral (EC)DH secret). If not \c NULL, this must be
+ *                    a readable buffer whose size \p input_len Bytes.
+ *                    If \c NULL, an all \c 0 array will be used instead.
+ * \param input_len   The length of \p input in Bytes.
+ * \param secret_new  The address of the buffer holding the new secret
+ *                    on function exit. This must be a writable buffer
+ *                    whose size matches the output size of the hash
+ *                    function represented by \p hash_alg.
+ *                    This may be the same as \p secret_old.
+ *
+ * \returns           \c 0 on success.
+ * \returns           A negative error code on failure.
+ */
+
+int mbedtls_ssl_tls1_3_evolve_secret(
+                   mbedtls_md_type_t hash_alg,
+                   const unsigned char *secret_old,
+                   const unsigned char *input, size_t input_len,
+                   unsigned char *secret_new );
+
+#endif /* MBEDTLS_SSL_TLS1_3_KEYS_H */
diff --git a/tests/suites/test_suite_ssl.data b/tests/suites/test_suite_ssl.data
index 1b79191..6e653ff 100644
--- a/tests/suites/test_suite_ssl.data
+++ b/tests/suites/test_suite_ssl.data
@@ -10398,6 +10398,132 @@
 depends_on:MBEDTLS_DES_C:MBEDTLS_SHA512_C:!MBEDTLS_SHA512_NO_SHA384
 ssl_decrypt_non_etm_cbc:MBEDTLS_CIPHER_DES_EDE3_CBC:MBEDTLS_MD_SHA384:1:255
 
+SSL TLS 1.3 Key schedule: Secret evolution #1
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Initial secret to Early Secret
+depends_on:MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL
+ssl_tls1_3_key_evolution:MBEDTLS_MD_SHA256:"":"":"33ad0a1c607ec03b09e6cd9893680ce210adf300aa1f2660e1b22e10f170f92a"
+
+SSL TLS 1.3 Key schedule: Secret evolution #2
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Early secret to Handshake Secret
+ssl_tls1_3_key_evolution:MBEDTLS_MD_SHA256:"33ad0a1c607ec03b09e6cd9893680ce210adf300aa1f2660e1b22e10f170f92a":"df4a291baa1eb7cfa6934b29b474baad2697e29f1f920dcc77c8a0a088447624":"fb9fc80689b3a5d02c33243bf69a1b1b20705588a794304a6e7120155edf149a"
+
+SSL TLS 1.3 Key schedule: Secret evolution #3
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Handshake secret to Master Secret
+ssl_tls1_3_key_evolution:MBEDTLS_MD_SHA256:"fb9fc80689b3a5d02c33243bf69a1b1b20705588a794304a6e7120155edf149a":"":"7f2882bb9b9a46265941653e9c2f19067118151e21d12e57a7b6aca1f8150c8d"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #1
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Server handshake traffic secret -> Server traffic key
+# HKDF-Expand-Label(server_handshake_secret, "key", "", 16)
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"a2067265e7f0652a923d5d72ab0467c46132eeb968b6a32d311c805868548814":tls1_3_label_key:"":16:"844780a7acad9f980fa25c114e43402a"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #2
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Server handshake traffic secret -> Server traffic IV
+# HKDF-Expand-Label(server_handshake_secret, "iv", "", 12)
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"a2067265e7f0652a923d5d72ab0467c46132eeb968b6a32d311c805868548814":tls1_3_label_iv:"":12:"4c042ddc120a38d1417fc815"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #3
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Client handshake traffic secret -> Client traffic key
+# HKDF-Expand-Label(client_handshake_secret, "key", "", 16)
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"ff0e5b965291c608c1e8cd267eefc0afcc5e98a2786373f0db47b04786d72aea":tls1_3_label_key:"":16:"7154f314e6be7dc008df2c832baa1d39"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #4
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Client handshake traffic secret -> Client traffic IV
+# HKDF-Expand-Label(client_handshake_secret, "iv", "", 12)
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"ff0e5b965291c608c1e8cd267eefc0afcc5e98a2786373f0db47b04786d72aea":tls1_3_label_iv:"":12:"71abc2cae4c699d47c600268"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #5 (RFC 8448)
+# Vector from RFC 8448
+# Server handshake traffic secret -> Server traffic IV
+# HKDF-Expand-Label(server_handshake_secret, "iv", "", 12)
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"b67b7d690cc16c4e75e54213cb2d37b4e9c912bcded9105d42befd59d391ad38":tls1_3_label_iv:"":12:"5d313eb2671276ee13000b30"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #6 (RFC 8448)
+# Vector from RFC 8448
+# Server handshake traffic secret -> Server traffic Key
+# HKDF-Expand-Label(server_handshake_secret, "key", "", 16)
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"b67b7d690cc16c4e75e54213cb2d37b4e9c912bcded9105d42befd59d391ad38":tls1_3_label_key:"":16:"3fce516009c21727d0f2e4e86ee403bc"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #7 (RFC 8448)
+# Vector from RFC 8448
+# Client handshake traffic secret -> Client traffic IV
+# HKDF-Expand-Label(client_handshake_secret, "iv", "", 12)
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"b3eddb126e067f35a780b3abf45e2d8f3b1a950738f52e9600746a0e27a55a21":tls1_3_label_iv:"":12:"5bd3c71b836e0b76bb73265f"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #8 (RFC 8448)
+# Vector from RFC 8448
+# Client handshake traffic secret -> Client traffic Key
+# HKDF-Expand-Label(client_handshake_secret, "key", "", 16)
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"b3eddb126e067f35a780b3abf45e2d8f3b1a950738f52e9600746a0e27a55a21":tls1_3_label_key:"":16:"dbfaa693d1762c5b666af5d950258d01"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #9 (RFC 8448)
+# Calculation of finished_key
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"2faac08f851d35fea3604fcb4de82dc62c9b164a70974d0462e27f1ab278700f":tls1_3_label_finished:"":32:"5ace394c26980d581243f627d1150ae27e37fa52364e0a7f20ac686d09cd0e8e"
+
+SSL TLS 1.3 Key schedule: HKDF Expand Label #10 (RFC 8448)
+# Calculation of resumption key
+ssl_tls1_3_hkdf_expand_label:MBEDTLS_MD_SHA256:"7df235f2031d2a051287d02b0241b0bfdaf86cc856231f2d5aba46c434ec196c":tls1_3_label_resumption:"0000":32:"4ecd0eb6ec3b4d87f5d6028f922ca4c5851a277fd41311c9e62d2c9492e1c4f3"
+
+SSL TLS 1.3 Key schedule: Traffic key generation #1
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Client/Server handshake traffic secrets -> Client/Server traffic {Key,IV}
+ssl_tls1_3_traffic_key_generation:MBEDTLS_MD_SHA256:"a2067265e7f0652a923d5d72ab0467c46132eeb968b6a32d311c805868548814":"ff0e5b965291c608c1e8cd267eefc0afcc5e98a2786373f0db47b04786d72aea":12:16:"844780a7acad9f980fa25c114e43402a":"4c042ddc120a38d1417fc815":"7154f314e6be7dc008df2c832baa1d39":"71abc2cae4c699d47c600268"
+
+SSL TLS 1.3 Key schedule: Traffic key generation #2 (RFC 8448)
+# Vector RFC 8448
+# Client/Server handshake traffic secrets -> Client/Server traffic {Key,IV}
+ssl_tls1_3_traffic_key_generation:MBEDTLS_MD_SHA256:"a2067265e7f0652a923d5d72ab0467c46132eeb968b6a32d311c805868548814":"ff0e5b965291c608c1e8cd267eefc0afcc5e98a2786373f0db47b04786d72aea":12:16:"844780a7acad9f980fa25c114e43402a":"4c042ddc120a38d1417fc815":"7154f314e6be7dc008df2c832baa1d39":"71abc2cae4c699d47c600268"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "derived", "")
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Derive-Secret( Early-Secret, "derived", "")
+# Tests the case where context isn't yet hashed (empty string here,
+# but still needs to be hashed)
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"33ad0a1c607ec03b09e6cd9893680ce210adf300aa1f2660e1b22e10f170f92a":tls1_3_label_derived:"":32:MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED:"6f2615a108c702c5678f54fc9dbab69716c076189c48250cebeac3576c3611ba"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "s ap traffic", hash) #1
+# Vector from TLS 1.3 Byte by Byte (https://tls13.ulfheim.net/)
+# Derive-Secret( MasterSecret, "s ap traffic", hash)
+# Tests the case where context is already hashed
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"7f2882bb9b9a46265941653e9c2f19067118151e21d12e57a7b6aca1f8150c8d":tls1_3_label_s_ap_traffic:"22844b930e5e0a59a09d5ac35fc032fc91163b193874a265236e568077378d8b":32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"3fc35ea70693069a277956afa23b8f4543ce68ac595f2aace05cd7a1c92023d5"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "c e traffic", hash)
+# Vector from RFC 8448
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"9b2188e9b2fc6d64d71dc329900e20bb41915000f678aa839cbb797cb7d8332c":tls1_3_label_c_e_traffic:"08ad0fa05d7c7233b1775ba2ff9f4c5b8b59276b7f227f13a976245f5d960913":32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"3fbbe6a60deb66c30a32795aba0eff7eaa10105586e7be5c09678d63b6caab62"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "e exp master", hash)
+# Vector from RFC 8448
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"9b2188e9b2fc6d64d71dc329900e20bb41915000f678aa839cbb797cb7d8332c":tls1_3_label_e_exp_master:"08ad0fa05d7c7233b1775ba2ff9f4c5b8b59276b7f227f13a976245f5d960913":32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"b2026866610937d7423e5be90862ccf24c0e6091186d34f812089ff5be2ef7df"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "c hs traffic", hash)
+# Vector from RFC 8448
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"005cb112fd8eb4ccc623bb88a07c64b3ede1605363fc7d0df8c7ce4ff0fb4ae6":tls1_3_label_c_hs_traffic:"f736cb34fe25e701551bee6fd24c1cc7102a7daf9405cb15d97aafe16f757d03"::32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"2faac08f851d35fea3604fcb4de82dc62c9b164a70974d0462e27f1ab278700f"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "s hs traffic", hash)
+# Vector from RFC 8448
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"005cb112fd8eb4ccc623bb88a07c64b3ede1605363fc7d0df8c7ce4ff0fb4ae6":tls1_3_label_s_hs_traffic:"f736cb34fe25e701551bee6fd24c1cc7102a7daf9405cb15d97aafe16f757d03":32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"fe927ae271312e8bf0275b581c54eef020450dc4ecffaa05a1a35d27518e7803"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "c ap traffic", hash)
+# Vector from RFC 8448
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"e2d32d4ed66dd37897a0e80c84107503ce58bf8aad4cb55a5002d77ecb890ece":tls1_3_label_c_ap_traffic:"b0aeffc46a2cfe33114e6fd7d51f9f04b1ca3c497dab08934a774a9d9ad7dbf3":32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"2abbf2b8e381d23dbebe1dd2a7d16a8bf484cb4950d23fb7fb7fa8547062d9a1"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "s ap traffic", hash) #2
+# Vector from RFC 8448
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"e2d32d4ed66dd37897a0e80c84107503ce58bf8aad4cb55a5002d77ecb890ece":tls1_3_label_s_ap_traffic:"b0aeffc46a2cfe33114e6fd7d51f9f04b1ca3c497dab08934a774a9d9ad7dbf3":32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"cc21f1bf8feb7dd5fa505bd9c4b468a9984d554a993dc49e6d285598fb672691"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "exp master", hash)
+# Vector from RFC 8448
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"e2d32d4ed66dd37897a0e80c84107503ce58bf8aad4cb55a5002d77ecb890ece":tls1_3_label_exp_master:"b0aeffc46a2cfe33114e6fd7d51f9f04b1ca3c497dab08934a774a9d9ad7dbf3":32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"3fd93d4ffddc98e64b14dd107aedf8ee4add23f4510f58a4592d0b201bee56b4"
+
+SSL TLS 1.3 Key schedule: Derive-Secret( ., "res master", hash)
+# Vector from RFC 8448
+ssl_tls1_3_derive_secret:MBEDTLS_MD_SHA256:"e2d32d4ed66dd37897a0e80c84107503ce58bf8aad4cb55a5002d77ecb890ece":tls1_3_label_res_master:"c3c122e0bd907a4a3ff6112d8fd53dbf89c773d9552e8b6b9d56d361b3a97bf6":32:MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED:"5e95bdf1f89005ea2e9aa0ba85e728e3c19c5fe0c699e3f5bee59faebd0b5406"
 
 SSL TLS_PRF MBEDTLS_SSL_TLS_PRF_NONE
 ssl_tls_prf:MBEDTLS_SSL_TLS_PRF_NONE:"":"":"test tls_prf label":"":MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE
diff --git a/tests/suites/test_suite_ssl.function b/tests/suites/test_suite_ssl.function
index 7c4f865..9fcf367 100644
--- a/tests/suites/test_suite_ssl.function
+++ b/tests/suites/test_suite_ssl.function
@@ -6,11 +6,20 @@
 #include <mbedtls/certs.h>
 #include <mbedtls/timing.h>
 #include <mbedtls/debug.h>
+#include <ssl_tls13_keys.h>
 
 #include <ssl_invasive.h>
 
 #include <test/constant_flow.h>
 
+enum
+{
+#define MBEDTLS_SSL_TLS1_3_LABEL( name, string )   \
+     tls1_3_label_ ## name,
+MBEDTLS_SSL_TLS1_3_LABEL_LIST
+#undef MBEDTLS_SSL_TLS1_3_LABEL
+};
+
 typedef struct log_pattern
 {
     const char *pattern;
@@ -3669,6 +3678,150 @@
 }
 /* END_CASE */
 
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
+void ssl_tls1_3_hkdf_expand_label( int hash_alg,
+                                   data_t *secret,
+                                   int label_idx,
+                                   data_t *ctx,
+                                   int desired_length,
+                                   data_t *expected )
+{
+    unsigned char dst[ 100 ];
+
+    unsigned char const *lbl = NULL;
+    size_t lbl_len;
+#define MBEDTLS_SSL_TLS1_3_LABEL( name, string )                        \
+    if( label_idx == (int) tls1_3_label_ ## name )                      \
+    {                                                                   \
+        lbl = mbedtls_ssl_tls1_3_labels.name;                           \
+        lbl_len = sizeof( mbedtls_ssl_tls1_3_labels.name );             \
+    }
+MBEDTLS_SSL_TLS1_3_LABEL_LIST
+#undef MBEDTLS_SSL_TLS1_3_LABEL
+    TEST_ASSERT( lbl != NULL );
+
+    /* Check sanity of test parameters. */
+    TEST_ASSERT( (size_t) desired_length <= sizeof(dst) );
+    TEST_ASSERT( (size_t) desired_length == expected->len );
+
+    TEST_ASSERT( mbedtls_ssl_tls1_3_hkdf_expand_label(
+                      (mbedtls_md_type_t) hash_alg,
+                      secret->x, secret->len,
+                      lbl, lbl_len,
+                      ctx->x, ctx->len,
+                      dst, desired_length ) == 0 );
+
+    ASSERT_COMPARE( dst, (size_t) desired_length,
+                    expected->x, (size_t) expected->len );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
+void ssl_tls1_3_traffic_key_generation( int hash_alg,
+                                        data_t *server_secret,
+                                        data_t *client_secret,
+                                        int desired_iv_len,
+                                        int desired_key_len,
+                                        data_t *expected_server_write_key,
+                                        data_t *expected_server_write_iv,
+                                        data_t *expected_client_write_key,
+                                        data_t *expected_client_write_iv )
+{
+    mbedtls_ssl_key_set keys;
+
+    /* Check sanity of test parameters. */
+    TEST_ASSERT( client_secret->len == server_secret->len );
+    TEST_ASSERT( expected_client_write_iv->len == expected_server_write_iv->len &&
+                 expected_client_write_iv->len == (size_t) desired_iv_len );
+    TEST_ASSERT( expected_client_write_key->len == expected_server_write_key->len &&
+                 expected_client_write_key->len == (size_t) desired_key_len );
+
+    TEST_ASSERT( mbedtls_ssl_tls1_3_make_traffic_keys(
+                     (mbedtls_md_type_t) hash_alg,
+                     client_secret->x,
+                     server_secret->x,
+                     client_secret->len /* == server_secret->len */,
+                     desired_key_len, desired_iv_len,
+                     &keys ) == 0 );
+
+    ASSERT_COMPARE( keys.client_write_key,
+                    keys.key_len,
+                    expected_client_write_key->x,
+                    (size_t) desired_key_len );
+    ASSERT_COMPARE( keys.server_write_key,
+                    keys.key_len,
+                    expected_server_write_key->x,
+                    (size_t) desired_key_len );
+    ASSERT_COMPARE( keys.client_write_iv,
+                    keys.iv_len,
+                    expected_client_write_iv->x,
+                    (size_t) desired_iv_len );
+    ASSERT_COMPARE( keys.server_write_iv,
+                    keys.iv_len,
+                    expected_server_write_iv->x,
+                    (size_t) desired_iv_len );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
+void ssl_tls1_3_derive_secret( int hash_alg,
+                               data_t *secret,
+                               int label_idx,
+                               data_t *ctx,
+                               int desired_length,
+                               int already_hashed,
+                               data_t *expected )
+{
+    unsigned char dst[ 100 ];
+
+    unsigned char const *lbl = NULL;
+    size_t lbl_len;
+#define MBEDTLS_SSL_TLS1_3_LABEL( name, string )                        \
+    if( label_idx == (int) tls1_3_label_ ## name )                      \
+    {                                                                   \
+        lbl = mbedtls_ssl_tls1_3_labels.name;                           \
+        lbl_len = sizeof( mbedtls_ssl_tls1_3_labels.name );             \
+    }
+MBEDTLS_SSL_TLS1_3_LABEL_LIST
+#undef MBEDTLS_SSL_TLS1_3_LABEL
+    TEST_ASSERT( lbl != NULL );
+
+    /* Check sanity of test parameters. */
+    TEST_ASSERT( (size_t) desired_length <= sizeof(dst) );
+    TEST_ASSERT( (size_t) desired_length == expected->len );
+
+    TEST_ASSERT( mbedtls_ssl_tls1_3_derive_secret(
+                      (mbedtls_md_type_t) hash_alg,
+                      secret->x, secret->len,
+                      lbl, lbl_len,
+                      ctx->x, ctx->len,
+                      already_hashed,
+                      dst, desired_length ) == 0 );
+
+    ASSERT_COMPARE( dst, desired_length,
+                    expected->x, desired_length );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_SSL_PROTO_TLS1_3_EXPERIMENTAL */
+void ssl_tls1_3_key_evolution( int hash_alg,
+                               data_t *secret,
+                               data_t *input,
+                               data_t *expected )
+{
+    unsigned char secret_new[ MBEDTLS_MD_MAX_SIZE ];
+
+    TEST_ASSERT( mbedtls_ssl_tls1_3_evolve_secret(
+                      (mbedtls_md_type_t) hash_alg,
+                      secret->len ? secret->x : NULL,
+                      input->len ? input->x : NULL, input->len,
+                      secret_new ) == 0 );
+
+    ASSERT_COMPARE( secret_new, (size_t) expected->len,
+                    expected->x, (size_t) expected->len );
+}
+/* END_CASE */
+
 /* BEGIN_CASE */
 void ssl_tls_prf( int type, data_t * secret, data_t * random,
                   char *label, data_t *result_hex_str, int exp_ret )
diff --git a/visualc/VS2010/mbedTLS.vcxproj b/visualc/VS2010/mbedTLS.vcxproj
index db8ec33..b243b73 100644
--- a/visualc/VS2010/mbedTLS.vcxproj
+++ b/visualc/VS2010/mbedTLS.vcxproj
@@ -252,6 +252,7 @@
     <ClInclude Include="..\..\library\psa_crypto_slot_management.h" />
     <ClInclude Include="..\..\library\psa_crypto_storage.h" />
     <ClInclude Include="..\..\library\ssl_invasive.h" />
+    <ClInclude Include="..\..\library\ssl_tls13_keys.h" />
     <ClInclude Include="..\..\3rdparty\everest\include\everest\everest.h" />
     <ClInclude Include="..\..\3rdparty\everest\include\everest\Hacl_Curve25519.h" />
     <ClInclude Include="..\..\3rdparty\everest\include\everest\kremlib.h" />
@@ -331,6 +332,7 @@
     <ClCompile Include="..\..\library\ssl_srv.c" />
     <ClCompile Include="..\..\library\ssl_ticket.c" />
     <ClCompile Include="..\..\library\ssl_tls.c" />
+    <ClCompile Include="..\..\library\ssl_tls13_keys.c" />
     <ClCompile Include="..\..\library\threading.c" />
     <ClCompile Include="..\..\library\timing.c" />
     <ClCompile Include="..\..\library\version.c" />