Removed old mbedtls, replacing with submodule.

1 files changed, 0 insertions, 4545 deletions

diff --git a/lib/mbedtls-2.27.0/library/ssl_cli.c b/lib/mbedtls-2.27.0/library/ssl_cli.c
deleted file mode 100644
index f49178c..0000000
--- a/lib/mbedtls-2.27.0/library/ssl_cli.c
+++ /dev/null
@@ -1,4545 +0,0 @@
-/*
- *  SSLv3/TLSv1 client-side functions
- *
- *  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_CLI_C)
-
-#if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
-#else
-#include <stdlib.h>
-#define mbedtls_calloc    calloc
-#define mbedtls_free      free
-#endif
-
-#include "mbedtls/ssl.h"
-#include "mbedtls/ssl_internal.h"
-#include "mbedtls/debug.h"
-#include "mbedtls/error.h"
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-#include "mbedtls/psa_util.h"
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-#include <string.h>
-
-#include <stdint.h>
-
-#if defined(MBEDTLS_HAVE_TIME)
-#include "mbedtls/platform_time.h"
-#endif
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-#include "mbedtls/platform_util.h"
-#endif
-
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
-static int ssl_conf_has_static_psk( mbedtls_ssl_config const *conf )
-{
-    if( conf->psk_identity     == NULL ||
-        conf->psk_identity_len == 0     )
-    {
-        return( 0 );
-    }
-
-    if( conf->psk != NULL && conf->psk_len != 0 )
-        return( 1 );
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-    if( ! mbedtls_svc_key_id_is_null( conf->psk_opaque ) )
-        return( 1 );
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-    return( 0 );
-}
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-static int ssl_conf_has_static_raw_psk( mbedtls_ssl_config const *conf )
-{
-    if( conf->psk_identity     == NULL ||
-        conf->psk_identity_len == 0     )
-    {
-        return( 0 );
-    }
-
-    if( conf->psk != NULL && conf->psk_len != 0 )
-        return( 1 );
-
-    return( 0 );
-}
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
-
-#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
-static int ssl_write_hostname_ext( mbedtls_ssl_context *ssl,
-                                   unsigned char *buf,
-                                   const unsigned char *end,
-                                   size_t *olen )
-{
-    unsigned char *p = buf;
-    size_t hostname_len;
-
-    *olen = 0;
-
-    if( ssl->hostname == NULL )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding server name extension: %s",
-          ssl->hostname ) );
-
-    hostname_len = strlen( ssl->hostname );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, hostname_len + 9 );
-
-    /*
-     * Sect. 3, RFC 6066 (TLS Extensions Definitions)
-     *
-     * In order to provide any of the server names, clients MAY include an
-     * extension of type "server_name" in the (extended) client hello. The
-     * "extension_data" field of this extension SHALL contain
-     * "ServerNameList" where:
-     *
-     * struct {
-     *     NameType name_type;
-     *     select (name_type) {
-     *         case host_name: HostName;
-     *     } name;
-     * } ServerName;
-     *
-     * enum {
-     *     host_name(0), (255)
-     * } NameType;
-     *
-     * opaque HostName<1..2^16-1>;
-     *
-     * struct {
-     *     ServerName server_name_list<1..2^16-1>
-     * } ServerNameList;
-     *
-     */
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME      ) & 0xFF );
-
-    *p++ = (unsigned char)( ( (hostname_len + 5) >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( (hostname_len + 5)      ) & 0xFF );
-
-    *p++ = (unsigned char)( ( (hostname_len + 3) >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( (hostname_len + 3)      ) & 0xFF );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF );
-    *p++ = (unsigned char)( ( hostname_len >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( hostname_len      ) & 0xFF );
-
-    memcpy( p, ssl->hostname, hostname_len );
-
-    *olen = hostname_len + 9;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
-
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-static int ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
-                                        unsigned char *buf,
-                                        const unsigned char *end,
-                                        size_t *olen )
-{
-    unsigned char *p = buf;
-
-    *olen = 0;
-
-    /* We're always including an TLS_EMPTY_RENEGOTIATION_INFO_SCSV in the
-     * initial ClientHello, in which case also adding the renegotiation
-     * info extension is NOT RECOMMENDED as per RFC 5746 Section 3.4. */
-    if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding renegotiation extension" ) );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 5 + ssl->verify_data_len );
-
-    /*
-     * Secure renegotiation
-     */
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 )
-                            & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO      )
-                            & 0xFF );
-
-    *p++ = 0x00;
-    *p++ = ( ssl->verify_data_len + 1 ) & 0xFF;
-    *p++ = ssl->verify_data_len & 0xFF;
-
-    memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
-
-    *olen = 5 + ssl->verify_data_len;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_RENEGOTIATION */
-
-/*
- * Only if we handle at least one key exchange that needs signatures.
- */
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
-    defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
-static int ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
-                                               unsigned char *buf,
-                                               const unsigned char *end,
-                                               size_t *olen )
-{
-    unsigned char *p = buf;
-    size_t sig_alg_len = 0;
-    const int *md;
-
-#if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C)
-    unsigned char *sig_alg_list = buf + 6;
-#endif
-
-    *olen = 0;
-
-    if( ssl->conf->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding signature_algorithms extension" ) );
-
-    if( ssl->conf->sig_hashes == NULL )
-        return( MBEDTLS_ERR_SSL_BAD_CONFIG );
-
-    for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
-    {
-#if defined(MBEDTLS_ECDSA_C)
-        sig_alg_len += 2;
-#endif
-#if defined(MBEDTLS_RSA_C)
-        sig_alg_len += 2;
-#endif
-        if( sig_alg_len > MBEDTLS_SSL_MAX_SIG_HASH_ALG_LIST_LEN )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 3,
-                ( "length in bytes of sig-hash-alg extension too big" ) );
-            return( MBEDTLS_ERR_SSL_BAD_CONFIG );
-        }
-    }
-
-    /* Empty signature algorithms list, this is a configuration error. */
-    if( sig_alg_len == 0 )
-        return( MBEDTLS_ERR_SSL_BAD_CONFIG );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, sig_alg_len + 6 );
-
-    /*
-     * Prepare signature_algorithms extension (TLS 1.2)
-     */
-    sig_alg_len = 0;
-
-    for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
-    {
-#if defined(MBEDTLS_ECDSA_C)
-        sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md );
-        sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_ECDSA;
-#endif
-#if defined(MBEDTLS_RSA_C)
-        sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md );
-        sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_RSA;
-#endif
-    }
-
-    /*
-     * enum {
-     *     none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5),
-     *     sha512(6), (255)
-     * } HashAlgorithm;
-     *
-     * enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) }
-     *   SignatureAlgorithm;
-     *
-     * struct {
-     *     HashAlgorithm hash;
-     *     SignatureAlgorithm signature;
-     * } SignatureAndHashAlgorithm;
-     *
-     * SignatureAndHashAlgorithm
-     *   supported_signature_algorithms<2..2^16-2>;
-     */
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG      ) & 0xFF );
-
-    *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( ( sig_alg_len + 2 )      ) & 0xFF );
-
-    *p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( sig_alg_len      ) & 0xFF );
-
-    *olen = 6 + sig_alg_len;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
-          MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
-
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-static int ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
-                                                    unsigned char *buf,
-                                                    const unsigned char *end,
-                                                    size_t *olen )
-{
-    unsigned char *p = buf;
-    unsigned char *elliptic_curve_list = p + 6;
-    size_t elliptic_curve_len = 0;
-    const mbedtls_ecp_curve_info *info;
-    const mbedtls_ecp_group_id *grp_id;
-
-    *olen = 0;
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding supported_elliptic_curves extension" ) );
-
-    if( ssl->conf->curve_list == NULL )
-        return( MBEDTLS_ERR_SSL_BAD_CONFIG );
-
-    for( grp_id = ssl->conf->curve_list;
-         *grp_id != MBEDTLS_ECP_DP_NONE;
-         grp_id++ )
-    {
-        info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
-        if( info == NULL )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1,
-                ( "invalid curve in ssl configuration" ) );
-            return( MBEDTLS_ERR_SSL_BAD_CONFIG );
-        }
-        elliptic_curve_len += 2;
-
-        if( elliptic_curve_len > MBEDTLS_SSL_MAX_CURVE_LIST_LEN )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 3,
-                ( "malformed supported_elliptic_curves extension in config" ) );
-            return( MBEDTLS_ERR_SSL_BAD_CONFIG );
-        }
-    }
-
-    /* Empty elliptic curve list, this is a configuration error. */
-    if( elliptic_curve_len == 0 )
-        return( MBEDTLS_ERR_SSL_BAD_CONFIG );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 + elliptic_curve_len );
-
-    elliptic_curve_len = 0;
-
-    for( grp_id = ssl->conf->curve_list;
-         *grp_id != MBEDTLS_ECP_DP_NONE;
-         grp_id++ )
-    {
-        info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
-        elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8;
-        elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF;
-    }
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 )
-                            & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES      )
-                            & 0xFF );
-
-    *p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( ( elliptic_curve_len + 2 )      ) & 0xFF );
-
-    *p++ = (unsigned char)( ( ( elliptic_curve_len     ) >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( ( elliptic_curve_len     )      ) & 0xFF );
-
-    *olen = 6 + elliptic_curve_len;
-
-    return( 0 );
-}
-
-static int ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
-                                                  unsigned char *buf,
-                                                  const unsigned char *end,
-                                                  size_t *olen )
-{
-    unsigned char *p = buf;
-    (void) ssl; /* ssl used for debugging only */
-
-    *olen = 0;
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding supported_point_formats extension" ) );
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 )
-                            & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS      )
-                            & 0xFF );
-
-    *p++ = 0x00;
-    *p++ = 2;
-
-    *p++ = 1;
-    *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
-
-    *olen = 6;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
-          MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-static int ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
-                                       unsigned char *buf,
-                                       const unsigned char *end,
-                                       size_t *olen )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    unsigned char *p = buf;
-    size_t kkpp_len;
-
-    *olen = 0;
-
-    /* Skip costly extension if we can't use EC J-PAKE anyway */
-    if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding ecjpake_kkpp extension" ) );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP      ) & 0xFF );
-
-    /*
-     * We may need to send ClientHello multiple times for Hello verification.
-     * We don't want to compute fresh values every time (both for performance
-     * and consistency reasons), so cache the extension content.
-     */
-    if( ssl->handshake->ecjpake_cache == NULL ||
-        ssl->handshake->ecjpake_cache_len == 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "generating new ecjpake parameters" ) );
-
-        ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
-                                               p + 2, end - p - 2, &kkpp_len,
-                                               ssl->conf->f_rng, ssl->conf->p_rng );
-        if( ret != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1 ,
-                "mbedtls_ecjpake_write_round_one", ret );
-            return( ret );
-        }
-
-        ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len );
-        if( ssl->handshake->ecjpake_cache == NULL )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) );
-            return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
-        }
-
-        memcpy( ssl->handshake->ecjpake_cache, p + 2, kkpp_len );
-        ssl->handshake->ecjpake_cache_len = kkpp_len;
-    }
-    else
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "re-using cached ecjpake parameters" ) );
-
-        kkpp_len = ssl->handshake->ecjpake_cache_len;
-        MBEDTLS_SSL_CHK_BUF_PTR( p + 2, end, kkpp_len );
-
-        memcpy( p + 2, ssl->handshake->ecjpake_cache, kkpp_len );
-    }
-
-    *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( kkpp_len      ) & 0xFF );
-
-    *olen = kkpp_len + 4;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-
-#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-static int ssl_write_cid_ext( mbedtls_ssl_context *ssl,
-                              unsigned char *buf,
-                              const unsigned char *end,
-                              size_t *olen )
-{
-    unsigned char *p = buf;
-    size_t ext_len;
-
-    /*
-     * Quoting draft-ietf-tls-dtls-connection-id-05
-     * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05
-     *
-     *   struct {
-     *      opaque cid<0..2^8-1>;
-     *   } ConnectionId;
-    */
-
-    *olen = 0;
-    if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
-        ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED )
-    {
-        return( 0 );
-    }
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding CID extension" ) );
-
-    /* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX
-     * which is at most 255, so the increment cannot overflow. */
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, (unsigned)( ssl->own_cid_len + 5 ) );
-
-    /* Add extension ID + size */
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID      ) & 0xFF );
-    ext_len = (size_t) ssl->own_cid_len + 1;
-    *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( ext_len      ) & 0xFF );
-
-    *p++ = (uint8_t) ssl->own_cid_len;
-    memcpy( p, ssl->own_cid, ssl->own_cid_len );
-
-    *olen = ssl->own_cid_len + 5;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
-
-#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
-static int ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
-                                              unsigned char *buf,
-                                              const unsigned char *end,
-                                              size_t *olen )
-{
-    unsigned char *p = buf;
-
-    *olen = 0;
-
-    if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding max_fragment_length extension" ) );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 5 );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 )
-                            & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH      )
-                            & 0xFF );
-
-    *p++ = 0x00;
-    *p++ = 1;
-
-    *p++ = ssl->conf->mfl_code;
-
-    *olen = 5;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
-
-#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
-static int ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
-                                         unsigned char *buf,
-                                         const unsigned char *end,
-                                         size_t *olen )
-{
-    unsigned char *p = buf;
-
-    *olen = 0;
-
-    if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding truncated_hmac extension" ) );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC      ) & 0xFF );
-
-    *p++ = 0x00;
-    *p++ = 0x00;
-
-    *olen = 4;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
-
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
-static int ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
-                                           unsigned char *buf,
-                                           const unsigned char *end,
-                                           size_t *olen )
-{
-    unsigned char *p = buf;
-
-    *olen = 0;
-
-    if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
-        ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding encrypt_then_mac extension" ) );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC      ) & 0xFF );
-
-    *p++ = 0x00;
-    *p++ = 0x00;
-
-    *olen = 4;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
-
-#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
-static int ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
-                                      unsigned char *buf,
-                                      const unsigned char *end,
-                                      size_t *olen )
-{
-    unsigned char *p = buf;
-
-    *olen = 0;
-
-    if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
-        ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding extended_master_secret extension" ) );
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 )
-                            & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET      )
-                            & 0xFF );
-
-    *p++ = 0x00;
-    *p++ = 0x00;
-
-    *olen = 4;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-static int ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
-                                         unsigned char *buf,
-                                         const unsigned char *end,
-                                         size_t *olen )
-{
-    unsigned char *p = buf;
-    size_t tlen = ssl->session_negotiate->ticket_len;
-
-    *olen = 0;
-
-    if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, adding session ticket extension" ) );
-
-    /* The addition is safe here since the ticket length is 16 bit. */
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 4 + tlen );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET      ) & 0xFF );
-
-    *p++ = (unsigned char)( ( tlen >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( tlen      ) & 0xFF );
-
-    *olen = 4;
-
-    if( ssl->session_negotiate->ticket == NULL || tlen == 0 )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "sending session ticket of length %" MBEDTLS_PRINTF_SIZET, tlen ) );
-
-    memcpy( p, ssl->session_negotiate->ticket, tlen );
-
-    *olen += tlen;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_SESSION_TICKETS */
-
-#if defined(MBEDTLS_SSL_ALPN)
-static int ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
-                               unsigned char *buf,
-                               const unsigned char *end,
-                               size_t *olen )
-{
-    unsigned char *p = buf;
-    size_t alpnlen = 0;
-    const char **cur;
-
-    *olen = 0;
-
-    if( ssl->conf->alpn_list == NULL )
-        return( 0 );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) );
-
-    for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
-        alpnlen += strlen( *cur ) + 1;
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 6 + alpnlen );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN      ) & 0xFF );
-
-    /*
-     * opaque ProtocolName<1..2^8-1>;
-     *
-     * struct {
-     *     ProtocolName protocol_name_list<2..2^16-1>
-     * } ProtocolNameList;
-     */
-
-    /* Skip writing extension and list length for now */
-    p += 4;
-
-    for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
-    {
-        /*
-         * mbedtls_ssl_conf_set_alpn_protocols() checked that the length of
-         * protocol names is less than 255.
-         */
-        *p = (unsigned char)strlen( *cur );
-        memcpy( p + 1, *cur, *p );
-        p += 1 + *p;
-    }
-
-    *olen = p - buf;
-
-    /* List length = olen - 2 (ext_type) - 2 (ext_len) - 2 (list_len) */
-    buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF );
-    buf[5] = (unsigned char)( ( ( *olen - 6 )      ) & 0xFF );
-
-    /* Extension length = olen - 2 (ext_type) - 2 (ext_len) */
-    buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
-    buf[3] = (unsigned char)( ( ( *olen - 4 )      ) & 0xFF );
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_ALPN */
-
-#if defined(MBEDTLS_SSL_DTLS_SRTP)
-static int ssl_write_use_srtp_ext( mbedtls_ssl_context *ssl,
-                                   unsigned char *buf,
-                                   const unsigned char *end,
-                                   size_t *olen )
-{
-    unsigned char *p = buf;
-    size_t protection_profiles_index = 0, ext_len = 0;
-    uint16_t mki_len = 0, profile_value = 0;
-
-    *olen = 0;
-
-    if( ( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) ||
-        ( ssl->conf->dtls_srtp_profile_list == NULL ) ||
-        ( ssl->conf->dtls_srtp_profile_list_len == 0 ) )
-    {
-        return( 0 );
-    }
-
-    /* RFC 5764 section 4.1.1
-     * uint8 SRTPProtectionProfile[2];
-     *
-     * struct {
-     *   SRTPProtectionProfiles SRTPProtectionProfiles;
-     *   opaque srtp_mki<0..255>;
-     * } UseSRTPData;
-     * SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>;
-     */
-    if( ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED )
-    {
-        mki_len = ssl->dtls_srtp_info.mki_len;
-    }
-    /* Extension length = 2 bytes for profiles length,
-     *                    ssl->conf->dtls_srtp_profile_list_len * 2 (each profile is 2 bytes length ),
-     *                    1 byte for srtp_mki vector length and the mki_len value
-     */
-    ext_len = 2 + 2 * ( ssl->conf->dtls_srtp_profile_list_len ) + 1 + mki_len;
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding use_srtp extension" ) );
-
-    /* Check there is room in the buffer for the extension + 4 bytes
-     * - the extension tag (2 bytes)
-     * - the extension length (2 bytes)
-     */
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, ext_len + 4 );
-
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_USE_SRTP >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_USE_SRTP      ) & 0xFF );
-
-
-    *p++ = (unsigned char)( ( ( ext_len & 0xFF00 ) >> 8 ) & 0xFF );
-    *p++ = (unsigned char)( ext_len & 0xFF );
-
-    /* protection profile length: 2*(ssl->conf->dtls_srtp_profile_list_len) */
-    /* micro-optimization:
-     * the list size is limited to MBEDTLS_TLS_SRTP_MAX_PROFILE_LIST_LENGTH
-     * which is lower than 127, so the upper byte of the length is always 0
-     * For the documentation, the more generic code is left in comments
-     * *p++ = (unsigned char)( ( ( 2 * ssl->conf->dtls_srtp_profile_list_len )
-     *                        >> 8 ) & 0xFF );
-     */
-    *p++ = 0;
-    *p++ = (unsigned char)( ( 2 * ssl->conf->dtls_srtp_profile_list_len )
-                            & 0xFF );
-
-    for( protection_profiles_index=0;
-         protection_profiles_index < ssl->conf->dtls_srtp_profile_list_len;
-         protection_profiles_index++ )
-    {
-        profile_value = mbedtls_ssl_check_srtp_profile_value
-                ( ssl->conf->dtls_srtp_profile_list[protection_profiles_index] );
-        if( profile_value != MBEDTLS_TLS_SRTP_UNSET )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "ssl_write_use_srtp_ext, add profile: %04x",
-                                        profile_value ) );
-            *p++ = ( ( profile_value >> 8 ) & 0xFF );
-            *p++ = ( profile_value & 0xFF );
-        }
-        else
-        {
-            /*
-             * Note: we shall never arrive here as protection profiles
-             * is checked by mbedtls_ssl_conf_dtls_srtp_protection_profiles function
-             */
-            MBEDTLS_SSL_DEBUG_MSG( 3,
-                    ( "client hello, "
-                      "illegal DTLS-SRTP protection profile %d",
-                      ssl->conf->dtls_srtp_profile_list[protection_profiles_index]
-                    ) );
-            return( MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED );
-        }
-    }
-
-    *p++ = mki_len & 0xFF;
-
-    if( mki_len != 0 )
-    {
-        memcpy( p, ssl->dtls_srtp_info.mki_value, mki_len );
-        /*
-         * Increment p to point to the current position.
-         */
-        p += mki_len;
-        MBEDTLS_SSL_DEBUG_BUF( 3, "sending mki",  ssl->dtls_srtp_info.mki_value,
-                               ssl->dtls_srtp_info.mki_len );
-    }
-
-    /*
-     * total extension length: extension type (2 bytes)
-     *                         + extension length (2 bytes)
-     *                         + protection profile length (2 bytes)
-     *                         + 2 * number of protection profiles
-     *                         + srtp_mki vector length(1 byte)
-     *                         + mki value
-     */
-    *olen = p - buf;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_DTLS_SRTP */
-
-/*
- * Generate random bytes for ClientHello
- */
-static int ssl_generate_random( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    unsigned char *p = ssl->handshake->randbytes;
-#if defined(MBEDTLS_HAVE_TIME)
-    mbedtls_time_t t;
-#endif
-
-    /*
-     * When responding to a verify request, MUST reuse random (RFC 6347 4.2.1)
-     */
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
-        ssl->handshake->verify_cookie != NULL )
-    {
-        return( 0 );
-    }
-#endif
-
-#if defined(MBEDTLS_HAVE_TIME)
-    t = mbedtls_time( NULL );
-    *p++ = (unsigned char)( t >> 24 );
-    *p++ = (unsigned char)( t >> 16 );
-    *p++ = (unsigned char)( t >>  8 );
-    *p++ = (unsigned char)( t       );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, current time: %" MBEDTLS_PRINTF_LONGLONG,
-                                (long long) t ) );
-#else
-    if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
-        return( ret );
-
-    p += 4;
-#endif /* MBEDTLS_HAVE_TIME */
-
-    if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
-        return( ret );
-
-    return( 0 );
-}
-
-/**
- * \brief           Validate cipher suite against config in SSL context.
- *
- * \param suite_info    cipher suite to validate
- * \param ssl           SSL context
- * \param min_minor_ver Minimal minor version to accept a cipher suite
- * \param max_minor_ver Maximal minor version to accept a cipher suite
- *
- * \return          0 if valid, else 1
- */
-static int ssl_validate_ciphersuite(
-    const mbedtls_ssl_ciphersuite_t * suite_info,
-    const mbedtls_ssl_context * ssl,
-    int min_minor_ver, int max_minor_ver )
-{
-    (void) ssl;
-    if( suite_info == NULL )
-        return( 1 );
-
-    if( suite_info->min_minor_ver > max_minor_ver ||
-            suite_info->max_minor_ver < min_minor_ver )
-        return( 1 );
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
-            ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
-        return( 1 );
-#endif
-
-#if defined(MBEDTLS_ARC4_C)
-    if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
-            suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
-        return( 1 );
-#endif
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-    if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
-            mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
-        return( 1 );
-#endif
-
-    /* Don't suggest PSK-based ciphersuite if no PSK is available. */
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
-    if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) &&
-        ssl_conf_has_static_psk( ssl->conf ) == 0 )
-    {
-        return( 1 );
-    }
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
-
-    return( 0 );
-}
-
-static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    size_t i, n, olen, ext_len = 0;
-
-    unsigned char *buf;
-    unsigned char *p, *q;
-    const unsigned char *end;
-
-    unsigned char offer_compress;
-    const int *ciphersuites;
-    const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-    int uses_ec = 0;
-#endif
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
-
-    if( ssl->conf->f_rng == NULL )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
-        return( MBEDTLS_ERR_SSL_NO_RNG );
-    }
-
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
-#endif
-    {
-        ssl->major_ver = ssl->conf->min_major_ver;
-        ssl->minor_ver = ssl->conf->min_minor_ver;
-    }
-
-    if( ssl->conf->max_major_ver == 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "configured max major version is invalid, consider using mbedtls_ssl_config_defaults()" ) );
-        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
-    }
-
-    buf = ssl->out_msg;
-    end = buf + MBEDTLS_SSL_OUT_CONTENT_LEN;
-
-    /*
-     * Check if there's enough space for the first part of the ClientHello
-     * consisting of the 38 bytes described below, the session identifier (at
-     * most 32 bytes) and its length (1 byte).
-     *
-     * Use static upper bounds instead of the actual values
-     * to allow the compiler to optimize this away.
-     */
-    MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 38 + 1 + 32 );
-
-    /*
-     * The 38 first bytes of the ClientHello:
-     *     0  .   0   handshake type (written later)
-     *     1  .   3   handshake length (written later)
-     *     4  .   5   highest version supported
-     *     6  .   9   current UNIX time
-     *    10  .  37   random bytes
-     *
-     * The current UNIX time (4 bytes) and following 28 random bytes are written
-     * by ssl_generate_random() into ssl->handshake->randbytes buffer and then
-     * copied from there into the output buffer.
-     */
-
-    p = buf + 4;
-    mbedtls_ssl_write_version( ssl->conf->max_major_ver,
-                               ssl->conf->max_minor_ver,
-                               ssl->conf->transport, p );
-    p += 2;
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]",
-                   buf[4], buf[5] ) );
-
-    if( ( ret = ssl_generate_random( ssl ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_generate_random", ret );
-        return( ret );
-    }
-
-    memcpy( p, ssl->handshake->randbytes, 32 );
-    MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", p, 32 );
-    p += 32;
-
-    /*
-     *    38  .  38   session id length
-     *    39  . 39+n  session id
-     *   39+n . 39+n  DTLS only: cookie length (1 byte)
-     *   40+n .  ..   DTLS only: cookie
-     *   ..   . ..    ciphersuitelist length (2 bytes)
-     *   ..   . ..    ciphersuitelist
-     *   ..   . ..    compression methods length (1 byte)
-     *   ..   . ..    compression methods
-     *   ..   . ..    extensions length (2 bytes)
-     *   ..   . ..    extensions
-     */
-    n = ssl->session_negotiate->id_len;
-
-    if( n < 16 || n > 32 ||
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-        ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ||
-#endif
-        ssl->handshake->resume == 0 )
-    {
-        n = 0;
-    }
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-    /*
-     * RFC 5077 section 3.4: "When presenting a ticket, the client MAY
-     * generate and include a Session ID in the TLS ClientHello."
-     */
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
-#endif
-    {
-        if( ssl->session_negotiate->ticket != NULL &&
-                ssl->session_negotiate->ticket_len != 0 )
-        {
-            ret = ssl->conf->f_rng( ssl->conf->p_rng,
-                                    ssl->session_negotiate->id, 32 );
-
-            if( ret != 0 )
-                return( ret );
-
-            ssl->session_negotiate->id_len = n = 32;
-        }
-    }
-#endif /* MBEDTLS_SSL_SESSION_TICKETS */
-
-    /*
-     * The first check of the output buffer size above (
-     * MBEDTLS_SSL_CHK_BUF_PTR( buf, end, 38 + 1 + 32 );)
-     * has checked that there is enough space in the output buffer for the
-     * session identifier length byte and the session identifier (n <= 32).
-     */
-    *p++ = (unsigned char) n;
-
-    for( i = 0; i < n; i++ )
-        *p++ = ssl->session_negotiate->id[i];
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %" MBEDTLS_PRINTF_SIZET, n ) );
-    MBEDTLS_SSL_DEBUG_BUF( 3,   "client hello, session id", buf + 39, n );
-
-    /*
-     *   With 'n' being the length of the session identifier
-     *
-     *   39+n . 39+n  DTLS only: cookie length (1 byte)
-     *   40+n .  ..   DTLS only: cookie
-     *   ..   . ..    ciphersuitelist length (2 bytes)
-     *   ..   . ..    ciphersuitelist
-     *   ..   . ..    compression methods length (1 byte)
-     *   ..   . ..    compression methods
-     *   ..   . ..    extensions length (2 bytes)
-     *   ..   . ..    extensions
-     */
-
-    /*
-     * DTLS cookie
-     */
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-    {
-        MBEDTLS_SSL_CHK_BUF_PTR( p, end, 1 );
-
-        if( ssl->handshake->verify_cookie == NULL )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "no verify cookie to send" ) );
-            *p++ = 0;
-        }
-        else
-        {
-            MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
-                              ssl->handshake->verify_cookie,
-                              ssl->handshake->verify_cookie_len );
-
-            *p++ = ssl->handshake->verify_cookie_len;
-
-            MBEDTLS_SSL_CHK_BUF_PTR( p, end,
-                                     ssl->handshake->verify_cookie_len );
-            memcpy( p, ssl->handshake->verify_cookie,
-                       ssl->handshake->verify_cookie_len );
-            p += ssl->handshake->verify_cookie_len;
-        }
-    }
-#endif
-
-    /*
-     * Ciphersuite list
-     */
-    ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
-
-    /* Skip writing ciphersuite length for now */
-    n = 0;
-    q = p;
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
-    p += 2;
-
-    for( i = 0; ciphersuites[i] != 0; i++ )
-    {
-        ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuites[i] );
-
-        if( ssl_validate_ciphersuite( ciphersuite_info, ssl,
-                                      ssl->conf->min_minor_ver,
-                                      ssl->conf->max_minor_ver ) != 0 )
-            continue;
-
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %#04x (%s)",
-                                    (unsigned int)ciphersuites[i], ciphersuite_info->name ) );
-
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-        uses_ec |= mbedtls_ssl_ciphersuite_uses_ec( ciphersuite_info );
-#endif
-
-        MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
-
-        n++;
-        *p++ = (unsigned char)( ciphersuites[i] >> 8 );
-        *p++ = (unsigned char)( ciphersuites[i]      );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "client hello, got %" MBEDTLS_PRINTF_SIZET " ciphersuites (excluding SCSVs)", n ) );
-
-    /*
-     * Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
-     */
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
-#endif
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding EMPTY_RENEGOTIATION_INFO_SCSV" ) );
-        MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
-        *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO >> 8 );
-        *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO      );
-        n++;
-    }
-
-    /* Some versions of OpenSSL don't handle it correctly if not at end */
-#if defined(MBEDTLS_SSL_FALLBACK_SCSV)
-    if( ssl->conf->fallback == MBEDTLS_SSL_IS_FALLBACK )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding FALLBACK_SCSV" ) );
-
-        MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
-        *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 );
-        *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE      );
-        n++;
-    }
-#endif
-
-    *q++ = (unsigned char)( n >> 7 );
-    *q++ = (unsigned char)( n << 1 );
-
-#if defined(MBEDTLS_ZLIB_SUPPORT)
-    offer_compress = 1;
-#else
-    offer_compress = 0;
-#endif
-
-    /*
-     * We don't support compression with DTLS right now: if many records come
-     * in the same datagram, uncompressing one could overwrite the next one.
-     * We don't want to add complexity for handling that case unless there is
-     * an actual need for it.
-     */
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-        offer_compress = 0;
-#endif
-
-    if( offer_compress )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) );
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d",
-                                    MBEDTLS_SSL_COMPRESS_DEFLATE,
-                                    MBEDTLS_SSL_COMPRESS_NULL ) );
-
-        MBEDTLS_SSL_CHK_BUF_PTR( p, end, 3 );
-        *p++ = 2;
-        *p++ = MBEDTLS_SSL_COMPRESS_DEFLATE;
-        *p++ = MBEDTLS_SSL_COMPRESS_NULL;
-    }
-    else
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) );
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d",
-                            MBEDTLS_SSL_COMPRESS_NULL ) );
-
-        MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
-        *p++ = 1;
-        *p++ = MBEDTLS_SSL_COMPRESS_NULL;
-    }
-
-    /* First write extensions, then the total length */
-
-    MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );
-
-#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
-    if( ( ret = ssl_write_hostname_ext( ssl, p + 2 + ext_len,
-                                        end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_hostname_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-    /* Note that TLS_EMPTY_RENEGOTIATION_INFO_SCSV is always added
-     * even if MBEDTLS_SSL_RENEGOTIATION is not defined. */
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    if( ( ret = ssl_write_renegotiation_ext( ssl, p + 2 + ext_len,
-                                             end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_renegotiation_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
-    defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
-    if( ( ret = ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len,
-                                                    end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_signature_algorithms_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-    if( uses_ec )
-    {
-        if( ( ret = ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len,
-                                                             end, &olen ) ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_supported_elliptic_curves_ext", ret );
-            return( ret );
-        }
-        ext_len += olen;
-
-        if( ( ret = ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len,
-                                                           end, &olen ) ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_supported_point_formats_ext", ret );
-            return( ret );
-        }
-        ext_len += olen;
-    }
-#endif
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-    if( ( ret = ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len,
-                                            end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_ecjpake_kkpp_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-    if( ( ret = ssl_write_cid_ext( ssl, p + 2 + ext_len, end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_cid_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
-
-#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
-    if( ( ret = ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len,
-                                                   end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_max_fragment_length_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
-    if( ( ret = ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len,
-                                              end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_truncated_hmac_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
-    if( ( ret = ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len,
-                                                end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_encrypt_then_mac_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
-    if( ( ret = ssl_write_extended_ms_ext( ssl, p + 2 + ext_len,
-                                           end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_extended_ms_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_ALPN)
-    if( ( ret = ssl_write_alpn_ext( ssl, p + 2 + ext_len,
-                                    end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_alpn_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_DTLS_SRTP)
-    if( ( ret = ssl_write_use_srtp_ext( ssl, p + 2 + ext_len,
-                                        end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_use_srtp_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-    if( ( ret = ssl_write_session_ticket_ext( ssl, p + 2 + ext_len,
-                                              end, &olen ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "ssl_write_session_ticket_ext", ret );
-        return( ret );
-    }
-    ext_len += olen;
-#endif
-
-    /* olen unused if all extensions are disabled */
-    ((void) olen);
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %" MBEDTLS_PRINTF_SIZET,
-                                ext_len ) );
-
-    if( ext_len > 0 )
-    {
-        /* No need to check for space here, because the extension
-         * writing functions already took care of that. */
-        *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
-        *p++ = (unsigned char)( ( ext_len      ) & 0xFF );
-        p += ext_len;
-    }
-
-    ssl->out_msglen  = p - buf;
-    ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
-    ssl->out_msg[0]  = MBEDTLS_SSL_HS_CLIENT_HELLO;
-
-    ssl->state++;
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-        mbedtls_ssl_send_flight_completed( ssl );
-#endif
-
-    if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
-        return( ret );
-    }
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
-        ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret );
-        return( ret );
-    }
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client hello" ) );
-
-    return( 0 );
-}
-
-static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
-                                         const unsigned char *buf,
-                                         size_t len )
-{
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
-    {
-        /* Check verify-data in constant-time. The length OTOH is no secret */
-        if( len    != 1 + ssl->verify_data_len * 2 ||
-            buf[0] !=     ssl->verify_data_len * 2 ||
-            mbedtls_ssl_safer_memcmp( buf + 1,
-                          ssl->own_verify_data, ssl->verify_data_len ) != 0 ||
-            mbedtls_ssl_safer_memcmp( buf + 1 + ssl->verify_data_len,
-                          ssl->peer_verify_data, ssl->verify_data_len ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-        }
-    }
-    else
-#endif /* MBEDTLS_SSL_RENEGOTIATION */
-    {
-        if( len != 1 || buf[0] != 0x00 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1,
-                ( "non-zero length renegotiation info" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-        }
-
-        ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
-    }
-
-    return( 0 );
-}
-
-#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
-static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
-                                              const unsigned char *buf,
-                                              size_t len )
-{
-    /*
-     * server should use the extension only if we did,
-     * and if so the server's value should match ours (and len is always 1)
-     */
-    if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ||
-        len != 1 ||
-        buf[0] != ssl->conf->mfl_code )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "non-matching max fragment length extension" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
-
-#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
-static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl,
-                                         const unsigned char *buf,
-                                         size_t len )
-{
-    if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ||
-        len != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "non-matching truncated HMAC extension" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    ((void) buf);
-
-    ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
-
-#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl,
-                              const unsigned char *buf,
-                              size_t len )
-{
-    size_t peer_cid_len;
-
-    if( /* CID extension only makes sense in DTLS */
-        ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ||
-        /* The server must only send the CID extension if we have offered it. */
-        ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension unexpected" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                     MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    if( len == 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                     MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    peer_cid_len = *buf++;
-    len--;
-
-    if( peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                     MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    if( len != peer_cid_len )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "CID extension invalid" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                     MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED;
-    ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len;
-    memcpy( ssl->handshake->peer_cid, buf, peer_cid_len );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) );
-    MBEDTLS_SSL_DEBUG_BUF( 3, "Server CID", buf, peer_cid_len );
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
-
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
-static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
-                                         const unsigned char *buf,
-                                         size_t len )
-{
-    if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
-        ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
-        len != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "non-matching encrypt-then-MAC extension" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    ((void) buf);
-
-    ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
-
-#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
-static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
-                                         const unsigned char *buf,
-                                         size_t len )
-{
-    if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
-        ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
-        len != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "non-matching extended master secret extension" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    ((void) buf);
-
-    ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
-                                         const unsigned char *buf,
-                                         size_t len )
-{
-    if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED ||
-        len != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "non-matching session ticket extension" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    ((void) buf);
-
-    ssl->handshake->new_session_ticket = 1;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_SESSION_TICKETS */
-
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl,
-                                                  const unsigned char *buf,
-                                                  size_t len )
-{
-    size_t list_size;
-    const unsigned char *p;
-
-    if( len == 0 || (size_t)( buf[0] + 1 ) != len )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-    list_size = buf[0];
-
-    p = buf + 1;
-    while( list_size > 0 )
-    {
-        if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED ||
-            p[0] == MBEDTLS_ECP_PF_COMPRESSED )
-        {
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
-            ssl->handshake->ecdh_ctx.point_format = p[0];
-#endif
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-            ssl->handshake->ecjpake_ctx.point_format = p[0];
-#endif
-            MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
-            return( 0 );
-        }
-
-        list_size--;
-        p++;
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) );
-    mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                    MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-    return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-}
-#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
-          MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
-                                   const unsigned char *buf,
-                                   size_t len )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-
-    if( ssl->handshake->ciphersuite_info->key_exchange !=
-        MBEDTLS_KEY_EXCHANGE_ECJPAKE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
-        return( 0 );
-    }
-
-    /* If we got here, we no longer need our cached extension */
-    mbedtls_free( ssl->handshake->ecjpake_cache );
-    ssl->handshake->ecjpake_cache = NULL;
-    ssl->handshake->ecjpake_cache_len = 0;
-
-    if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
-                                                buf, len ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-        return( ret );
-    }
-
-    return( 0 );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-
-#if defined(MBEDTLS_SSL_ALPN)
-static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
-                               const unsigned char *buf, size_t len )
-{
-    size_t list_len, name_len;
-    const char **p;
-
-    /* If we didn't send it, the server shouldn't send it */
-    if( ssl->conf->alpn_list == NULL )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching ALPN extension" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNSUPPORTED_EXT );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    /*
-     * opaque ProtocolName<1..2^8-1>;
-     *
-     * struct {
-     *     ProtocolName protocol_name_list<2..2^16-1>
-     * } ProtocolNameList;
-     *
-     * the "ProtocolNameList" MUST contain exactly one "ProtocolName"
-     */
-
-    /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
-    if( len < 4 )
-    {
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    list_len = ( buf[0] << 8 ) | buf[1];
-    if( list_len != len - 2 )
-    {
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    name_len = buf[2];
-    if( name_len != list_len - 1 )
-    {
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    /* Check that the server chosen protocol was in our list and save it */
-    for( p = ssl->conf->alpn_list; *p != NULL; p++ )
-    {
-        if( name_len == strlen( *p ) &&
-            memcmp( buf + 3, *p, name_len ) == 0 )
-        {
-            ssl->alpn_chosen = *p;
-            return( 0 );
-        }
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 1, ( "ALPN extension: no matching protocol" ) );
-    mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                    MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-    return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-}
-#endif /* MBEDTLS_SSL_ALPN */
-
-#if defined(MBEDTLS_SSL_DTLS_SRTP)
-static int ssl_parse_use_srtp_ext( mbedtls_ssl_context *ssl,
-                                   const unsigned char *buf,
-                                   size_t len )
-{
-    mbedtls_ssl_srtp_profile server_protection = MBEDTLS_TLS_SRTP_UNSET;
-    size_t i, mki_len = 0;
-    uint16_t server_protection_profile_value = 0;
-
-    /* If use_srtp is not configured, just ignore the extension */
-    if( ( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM ) ||
-        ( ssl->conf->dtls_srtp_profile_list == NULL ) ||
-        ( ssl->conf->dtls_srtp_profile_list_len == 0 ) )
-        return( 0 );
-
-    /* RFC 5764 section 4.1.1
-     * uint8 SRTPProtectionProfile[2];
-     *
-     * struct {
-     *   SRTPProtectionProfiles SRTPProtectionProfiles;
-     *   opaque srtp_mki<0..255>;
-     * } UseSRTPData;
-
-     * SRTPProtectionProfile SRTPProtectionProfiles<2..2^16-1>;
-     *
-     */
-    if( ssl->conf->dtls_srtp_mki_support == MBEDTLS_SSL_DTLS_SRTP_MKI_SUPPORTED )
-    {
-        mki_len = ssl->dtls_srtp_info.mki_len;
-    }
-
-    /*
-     * Length is 5 + optional mki_value : one protection profile length (2 bytes)
-     *                                      + protection profile (2 bytes)
-     *                                      + mki_len(1 byte)
-     *                                      and optional srtp_mki
-     */
-    if( ( len < 5 ) || ( len != ( buf[4] + 5u ) ) )
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-
-    /*
-     * get the server protection profile
-     */
-
-    /*
-     * protection profile length must be 0x0002 as we must have only
-     * one protection profile in server Hello
-     */
-    if( (  buf[0] != 0 ) || ( buf[1] != 2 ) )
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-
-    server_protection_profile_value = ( buf[2] << 8 ) | buf[3];
-    server_protection = mbedtls_ssl_check_srtp_profile_value(
-                    server_protection_profile_value );
-    if( server_protection != MBEDTLS_TLS_SRTP_UNSET )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 3, ( "found srtp profile: %s",
-                                      mbedtls_ssl_get_srtp_profile_as_string(
-                                              server_protection ) ) );
-    }
-
-    ssl->dtls_srtp_info.chosen_dtls_srtp_profile = MBEDTLS_TLS_SRTP_UNSET;
-
-    /*
-     * Check we have the server profile in our list
-     */
-    for( i=0; i < ssl->conf->dtls_srtp_profile_list_len; i++)
-    {
-        if( server_protection == ssl->conf->dtls_srtp_profile_list[i] )
-        {
-            ssl->dtls_srtp_info.chosen_dtls_srtp_profile = ssl->conf->dtls_srtp_profile_list[i];
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "selected srtp profile: %s",
-                                      mbedtls_ssl_get_srtp_profile_as_string(
-                                              server_protection ) ) );
-            break;
-        }
-    }
-
-    /* If no match was found : server problem, it shall never answer with incompatible profile */
-    if( ssl->dtls_srtp_info.chosen_dtls_srtp_profile == MBEDTLS_TLS_SRTP_UNSET )
-    {
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    /* If server does not use mki in its reply, make sure the client won't keep
-     * one as negotiated */
-    if( len == 5 )
-    {
-        ssl->dtls_srtp_info.mki_len = 0;
-    }
-
-    /*
-     * RFC5764:
-     *  If the client detects a nonzero-length MKI in the server's response
-     *  that is different than the one the client offered, then the client
-     *  MUST abort the handshake and SHOULD send an invalid_parameter alert.
-     */
-    if( len > 5  && ( buf[4] != mki_len ||
-        ( memcmp( ssl->dtls_srtp_info.mki_value, &buf[5], mki_len ) ) ) )
-    {
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-#if defined (MBEDTLS_DEBUG_C)
-    if( len > 5 )
-    {
-        MBEDTLS_SSL_DEBUG_BUF( 3, "received mki", ssl->dtls_srtp_info.mki_value,
-                                                  ssl->dtls_srtp_info.mki_len );
-    }
-#endif
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_DTLS_SRTP */
-
-/*
- * Parse HelloVerifyRequest.  Only called after verifying the HS type.
- */
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl )
-{
-    const unsigned char *p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
-    int major_ver, minor_ver;
-    unsigned char cookie_len;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse hello verify request" ) );
-
-    /* Check that there is enough room for:
-     * - 2 bytes of version
-     * - 1 byte of cookie_len
-     */
-    if( mbedtls_ssl_hs_hdr_len( ssl ) + 3 > ssl->in_msglen )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "incoming HelloVerifyRequest message is too short" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                    MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    /*
-     * struct {
-     *   ProtocolVersion server_version;
-     *   opaque cookie<0..2^8-1>;
-     * } HelloVerifyRequest;
-     */
-    MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
-    mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, p );
-    p += 2;
-
-    /*
-     * Since the RFC is not clear on this point, accept DTLS 1.0 (TLS 1.1)
-     * even is lower than our min version.
-     */
-    if( major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 ||
-        minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 ||
-        major_ver > ssl->conf->max_major_ver  ||
-        minor_ver > ssl->conf->max_minor_ver  )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server version" ) );
-
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                     MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
-
-        return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
-    }
-
-    cookie_len = *p++;
-    if( ( ssl->in_msg + ssl->in_msglen ) - p < cookie_len )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "cookie length does not match incoming message size" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                    MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-    MBEDTLS_SSL_DEBUG_BUF( 3, "cookie", p, cookie_len );
-
-    mbedtls_free( ssl->handshake->verify_cookie );
-
-    ssl->handshake->verify_cookie = mbedtls_calloc( 1, cookie_len );
-    if( ssl->handshake->verify_cookie  == NULL )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", cookie_len ) );
-        return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
-    }
-
-    memcpy( ssl->handshake->verify_cookie, p, cookie_len );
-    ssl->handshake->verify_cookie_len = cookie_len;
-
-    /* Start over at ClientHello */
-    ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
-    mbedtls_ssl_reset_checksum( ssl );
-
-    mbedtls_ssl_recv_flight_completed( ssl );
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse hello verify request" ) );
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-
-static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
-{
-    int ret, i;
-    size_t n;
-    size_t ext_len;
-    unsigned char *buf, *ext;
-    unsigned char comp;
-#if defined(MBEDTLS_ZLIB_SUPPORT)
-    int accept_comp;
-#endif
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    int renegotiation_info_seen = 0;
-#endif
-    int handshake_failure = 0;
-    const mbedtls_ssl_ciphersuite_t *suite_info;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
-
-    if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
-    {
-        /* No alert on a read error. */
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
-        return( ret );
-    }
-
-    buf = ssl->in_msg;
-
-    if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
-    {
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-        if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
-        {
-            ssl->renego_records_seen++;
-
-            if( ssl->conf->renego_max_records >= 0 &&
-                ssl->renego_records_seen > ssl->conf->renego_max_records )
-            {
-                MBEDTLS_SSL_DEBUG_MSG( 1,
-                    ( "renegotiation requested, but not honored by server" ) );
-                return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
-            }
-
-            MBEDTLS_SSL_DEBUG_MSG( 1,
-                ( "non-handshake message during renegotiation" ) );
-
-            ssl->keep_current_message = 1;
-            return( MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO );
-        }
-#endif /* MBEDTLS_SSL_RENEGOTIATION */
-
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
-        return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
-    }
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-    {
-        if( buf[0] == MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 2, ( "received hello verify request" ) );
-            MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
-            return( ssl_parse_hello_verify_request( ssl ) );
-        }
-        else
-        {
-            /* We made it through the verification process */
-            mbedtls_free( ssl->handshake->verify_cookie );
-            ssl->handshake->verify_cookie = NULL;
-            ssl->handshake->verify_cookie_len = 0;
-        }
-    }
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-
-    if( ssl->in_hslen < 38 + mbedtls_ssl_hs_hdr_len( ssl ) ||
-        buf[0] != MBEDTLS_SSL_HS_SERVER_HELLO )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    /*
-     *  0   .  1    server_version
-     *  2   . 33    random (maybe including 4 bytes of Unix time)
-     * 34   . 34    session_id length = n
-     * 35   . 34+n  session_id
-     * 35+n . 36+n  cipher_suite
-     * 37+n . 37+n  compression_method
-     *
-     * 38+n . 39+n  extensions length (optional)
-     * 40+n .  ..   extensions
-     */
-    buf += mbedtls_ssl_hs_hdr_len( ssl );
-
-    MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, version", buf + 0, 2 );
-    mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
-                      ssl->conf->transport, buf + 0 );
-
-    if( ssl->major_ver < ssl->conf->min_major_ver ||
-        ssl->minor_ver < ssl->conf->min_minor_ver ||
-        ssl->major_ver > ssl->conf->max_major_ver ||
-        ssl->minor_ver > ssl->conf->max_minor_ver )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "server version out of bounds -  min: [%d:%d], server: [%d:%d], max: [%d:%d]",
-              ssl->conf->min_major_ver,
-              ssl->conf->min_minor_ver,
-              ssl->major_ver, ssl->minor_ver,
-              ssl->conf->max_major_ver,
-              ssl->conf->max_minor_ver ) );
-
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                     MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
-
-        return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu",
-                                     ( (unsigned long) buf[2] << 24 ) |
-                                     ( (unsigned long) buf[3] << 16 ) |
-                                     ( (unsigned long) buf[4] <<  8 ) |
-                                     ( (unsigned long) buf[5]       ) ) );
-
-    memcpy( ssl->handshake->randbytes + 32, buf + 2, 32 );
-
-    n = buf[34];
-
-    MBEDTLS_SSL_DEBUG_BUF( 3,   "server hello, random bytes", buf + 2, 32 );
-
-    if( n > 32 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    if( ssl->in_hslen > mbedtls_ssl_hs_hdr_len( ssl ) + 39 + n )
-    {
-        ext_len = ( ( buf[38 + n] <<  8 )
-                  | ( buf[39 + n]       ) );
-
-        if( ( ext_len > 0 && ext_len < 4 ) ||
-            ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 40 + n + ext_len )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-        }
-    }
-    else if( ssl->in_hslen == mbedtls_ssl_hs_hdr_len( ssl ) + 38 + n )
-    {
-        ext_len = 0;
-    }
-    else
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    /* ciphersuite (used later) */
-    i = ( buf[35 + n] << 8 ) | buf[36 + n];
-
-    /*
-     * Read and check compression
-     */
-    comp = buf[37 + n];
-
-#if defined(MBEDTLS_ZLIB_SUPPORT)
-    /* See comments in ssl_write_client_hello() */
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-        accept_comp = 0;
-    else
-#endif
-        accept_comp = 1;
-
-    if( comp != MBEDTLS_SSL_COMPRESS_NULL &&
-        ( comp != MBEDTLS_SSL_COMPRESS_DEFLATE || accept_comp == 0 ) )
-#else /* MBEDTLS_ZLIB_SUPPORT */
-    if( comp != MBEDTLS_SSL_COMPRESS_NULL )
-#endif/* MBEDTLS_ZLIB_SUPPORT */
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "server hello, bad compression: %d", comp ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-        return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
-    }
-
-    /*
-     * Initialize update checksum functions
-     */
-    ssl->handshake->ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( i );
-    if( ssl->handshake->ciphersuite_info == NULL )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "ciphersuite info for %04x not found", (unsigned int)i ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
-    }
-
-    mbedtls_ssl_optimize_checksum( ssl, ssl->handshake->ciphersuite_info );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %" MBEDTLS_PRINTF_SIZET, n ) );
-    MBEDTLS_SSL_DEBUG_BUF( 3,   "server hello, session id", buf + 35, n );
-
-    /*
-     * Check if the session can be resumed
-     */
-    if( ssl->handshake->resume == 0 || n == 0 ||
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-        ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ||
-#endif
-        ssl->session_negotiate->ciphersuite != i ||
-        ssl->session_negotiate->compression != comp ||
-        ssl->session_negotiate->id_len != n ||
-        memcmp( ssl->session_negotiate->id, buf + 35, n ) != 0 )
-    {
-        ssl->state++;
-        ssl->handshake->resume = 0;
-#if defined(MBEDTLS_HAVE_TIME)
-        ssl->session_negotiate->start = mbedtls_time( NULL );
-#endif
-        ssl->session_negotiate->ciphersuite = i;
-        ssl->session_negotiate->compression = comp;
-        ssl->session_negotiate->id_len = n;
-        memcpy( ssl->session_negotiate->id, buf + 35, n );
-    }
-    else
-    {
-        ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
-
-        if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
-            return( ret );
-        }
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
-                   ssl->handshake->resume ? "a" : "no" ) );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %04x", (unsigned) i ) );
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d",
-                                buf[37 + n] ) );
-
-    /*
-     * Perform cipher suite validation in same way as in ssl_write_client_hello.
-     */
-    i = 0;
-    while( 1 )
-    {
-        if( ssl->conf->ciphersuite_list[ssl->minor_ver][i] == 0 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-        }
-
-        if( ssl->conf->ciphersuite_list[ssl->minor_ver][i++] ==
-            ssl->session_negotiate->ciphersuite )
-        {
-            break;
-        }
-    }
-
-    suite_info = mbedtls_ssl_ciphersuite_from_id(
-        ssl->session_negotiate->ciphersuite );
-    if( ssl_validate_ciphersuite( suite_info, ssl, ssl->minor_ver,
-                                  ssl->minor_ver ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 3,
-        ( "server hello, chosen ciphersuite: %s", suite_info->name ) );
-
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-    if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA &&
-        ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
-    {
-        ssl->handshake->ecrs_enabled = 1;
-    }
-#endif
-
-    if( comp != MBEDTLS_SSL_COMPRESS_NULL
-#if defined(MBEDTLS_ZLIB_SUPPORT)
-        && comp != MBEDTLS_SSL_COMPRESS_DEFLATE
-#endif
-      )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-    ssl->session_negotiate->compression = comp;
-
-    ext = buf + 40 + n;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2,
-        ( "server hello, total extension length: %" MBEDTLS_PRINTF_SIZET, ext_len ) );
-
-    while( ext_len )
-    {
-        unsigned int ext_id   = ( ( ext[0] <<  8 )
-                                | ( ext[1]       ) );
-        unsigned int ext_size = ( ( ext[2] <<  8 )
-                                | ( ext[3]       ) );
-
-        if( ext_size + 4 > ext_len )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-        }
-
-        switch( ext_id )
-        {
-        case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-            renegotiation_info_seen = 1;
-#endif
-
-            if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4,
-                                                      ext_size ) ) != 0 )
-                return( ret );
-
-            break;
-
-#if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
-        case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
-            MBEDTLS_SSL_DEBUG_MSG( 3,
-                ( "found max_fragment_length extension" ) );
-
-            if( ( ret = ssl_parse_max_fragment_length_ext( ssl,
-                            ext + 4, ext_size ) ) != 0 )
-            {
-                return( ret );
-            }
-
-            break;
-#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
-
-#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
-        case MBEDTLS_TLS_EXT_TRUNCATED_HMAC:
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated_hmac extension" ) );
-
-            if( ( ret = ssl_parse_truncated_hmac_ext( ssl,
-                            ext + 4, ext_size ) ) != 0 )
-            {
-                return( ret );
-            }
-
-            break;
-#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
-
-#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-        case MBEDTLS_TLS_EXT_CID:
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "found CID extension" ) );
-
-            if( ( ret = ssl_parse_cid_ext( ssl,
-                                           ext + 4,
-                                           ext_size ) ) != 0 )
-            {
-                return( ret );
-            }
-
-            break;
-#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
-
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
-        case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt_then_mac extension" ) );
-
-            if( ( ret = ssl_parse_encrypt_then_mac_ext( ssl,
-                            ext + 4, ext_size ) ) != 0 )
-            {
-                return( ret );
-            }
-
-            break;
-#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
-
-#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
-        case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
-            MBEDTLS_SSL_DEBUG_MSG( 3,
-                ( "found extended_master_secret extension" ) );
-
-            if( ( ret = ssl_parse_extended_ms_ext( ssl,
-                            ext + 4, ext_size ) ) != 0 )
-            {
-                return( ret );
-            }
-
-            break;
-#endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-        case MBEDTLS_TLS_EXT_SESSION_TICKET:
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session_ticket extension" ) );
-
-            if( ( ret = ssl_parse_session_ticket_ext( ssl,
-                            ext + 4, ext_size ) ) != 0 )
-            {
-                return( ret );
-            }
-
-            break;
-#endif /* MBEDTLS_SSL_SESSION_TICKETS */
-
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-        case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
-            MBEDTLS_SSL_DEBUG_MSG( 3,
-                ( "found supported_point_formats extension" ) );
-
-            if( ( ret = ssl_parse_supported_point_formats_ext( ssl,
-                            ext + 4, ext_size ) ) != 0 )
-            {
-                return( ret );
-            }
-
-            break;
-#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
-          MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-        case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake_kkpp extension" ) );
-
-            if( ( ret = ssl_parse_ecjpake_kkpp( ssl,
-                            ext + 4, ext_size ) ) != 0 )
-            {
-                return( ret );
-            }
-
-            break;
-#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-
-#if defined(MBEDTLS_SSL_ALPN)
-        case MBEDTLS_TLS_EXT_ALPN:
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
-
-            if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 )
-                return( ret );
-
-            break;
-#endif /* MBEDTLS_SSL_ALPN */
-
-#if defined(MBEDTLS_SSL_DTLS_SRTP)
-        case MBEDTLS_TLS_EXT_USE_SRTP:
-            MBEDTLS_SSL_DEBUG_MSG( 3, ( "found use_srtp extension" ) );
-
-            if( ( ret = ssl_parse_use_srtp_ext( ssl, ext + 4, ext_size ) ) != 0 )
-                return( ret );
-
-            break;
-#endif /* MBEDTLS_SSL_DTLS_SRTP */
-
-        default:
-            MBEDTLS_SSL_DEBUG_MSG( 3,
-                ( "unknown extension found: %u (ignoring)", ext_id ) );
-        }
-
-        ext_len -= 4 + ext_size;
-        ext += 4 + ext_size;
-
-        if( ext_len > 0 && ext_len < 4 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-        }
-    }
-
-    /*
-     * Renegotiation security checks
-     */
-    if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
-        ssl->conf->allow_legacy_renegotiation ==
-        MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "legacy renegotiation, breaking off handshake" ) );
-        handshake_failure = 1;
-    }
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-    else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
-             ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
-             renegotiation_info_seen == 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "renegotiation_info extension missing (secure)" ) );
-        handshake_failure = 1;
-    }
-    else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
-             ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
-             ssl->conf->allow_legacy_renegotiation ==
-             MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
-        handshake_failure = 1;
-    }
-    else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
-             ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
-             renegotiation_info_seen == 1 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "renegotiation_info extension present (legacy)" ) );
-        handshake_failure = 1;
-    }
-#endif /* MBEDTLS_SSL_RENEGOTIATION */
-
-    if( handshake_failure == 1 )
-    {
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
-
-    return( 0 );
-}
-
-#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) ||                       \
-    defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
-static int ssl_parse_server_dh_params( mbedtls_ssl_context *ssl,
-                                       unsigned char **p,
-                                       unsigned char *end )
-{
-    int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
-    size_t dhm_actual_bitlen;
-
-    /*
-     * Ephemeral DH parameters:
-     *
-     * struct {
-     *     opaque dh_p<1..2^16-1>;
-     *     opaque dh_g<1..2^16-1>;
-     *     opaque dh_Ys<1..2^16-1>;
-     * } ServerDHParams;
-     */
-    if( ( ret = mbedtls_dhm_read_params( &ssl->handshake->dhm_ctx,
-                                         p, end ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 2, ( "mbedtls_dhm_read_params" ), ret );
-        return( ret );
-    }
-
-    dhm_actual_bitlen = mbedtls_mpi_bitlen( &ssl->handshake->dhm_ctx.P );
-    if( dhm_actual_bitlen < ssl->conf->dhm_min_bitlen )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %" MBEDTLS_PRINTF_SIZET " < %u",
-                                    dhm_actual_bitlen,
-                                    ssl->conf->dhm_min_bitlen ) );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    }
-
-    MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P  );
-    MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G  );
-    MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
-
-    return( ret );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) ||                     \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ||                   \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) ||                     \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||                      \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
-static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl )
-{
-    const mbedtls_ecp_curve_info *curve_info;
-    mbedtls_ecp_group_id grp_id;
-#if defined(MBEDTLS_ECDH_LEGACY_CONTEXT)
-    grp_id = ssl->handshake->ecdh_ctx.grp.id;
-#else
-    grp_id = ssl->handshake->ecdh_ctx.grp_id;
-#endif
-
-    curve_info = mbedtls_ecp_curve_info_from_grp_id( grp_id );
-    if( curve_info == NULL )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) );
-
-#if defined(MBEDTLS_ECP_C)
-    if( mbedtls_ssl_check_curve( ssl, grp_id ) != 0 )
-#else
-    if( ssl->handshake->ecdh_ctx.grp.nbits < 163 ||
-        ssl->handshake->ecdh_ctx.grp.nbits > 521 )
-#endif
-        return( -1 );
-
-    MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
-                            MBEDTLS_DEBUG_ECDH_QP );
-
-    return( 0 );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO) &&                           \
-        ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) ||     \
-          defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) )
-static int ssl_parse_server_ecdh_params_psa( mbedtls_ssl_context *ssl,
-                                             unsigned char **p,
-                                             unsigned char *end )
-{
-    uint16_t tls_id;
-    size_t ecdh_bits = 0;
-    uint8_t ecpoint_len;
-    mbedtls_ssl_handshake_params *handshake = ssl->handshake;
-
-    /*
-     * Parse ECC group
-     */
-
-    if( end - *p < 4 )
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-
-    /* First byte is curve_type; only named_curve is handled */
-    if( *(*p)++ != MBEDTLS_ECP_TLS_NAMED_CURVE )
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-
-    /* Next two bytes are the namedcurve value */
-    tls_id = *(*p)++;
-    tls_id <<= 8;
-    tls_id |= *(*p)++;
-
-    /* Convert EC group to PSA key type. */
-    if( ( handshake->ecdh_psa_type =
-          mbedtls_psa_parse_tls_ecc_group( tls_id, &ecdh_bits ) ) == 0 )
-    {
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    }
-    if( ecdh_bits > 0xffff )
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    handshake->ecdh_bits = (uint16_t) ecdh_bits;
-
-    /*
-     * Put peer's ECDH public key in the format understood by PSA.
-     */
-
-    ecpoint_len = *(*p)++;
-    if( (size_t)( end - *p ) < ecpoint_len )
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-
-    if( mbedtls_psa_tls_ecpoint_to_psa_ec(
-                                    *p, ecpoint_len,
-                                    handshake->ecdh_psa_peerkey,
-                                    sizeof( handshake->ecdh_psa_peerkey ),
-                                    &handshake->ecdh_psa_peerkey_len ) != 0 )
-    {
-        return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
-    }
-
-    *p += ecpoint_len;
-    return( 0 );
-}
-#endif /* MBEDTLS_USE_PSA_CRYPTO &&
-            ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
-              MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) ||                     \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ||                   \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
-static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl,
-                                         unsigned char **p,
-                                         unsigned char *end )
-{
-    int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
-
-    /*
-     * Ephemeral ECDH parameters:
-     *
-     * struct {
-     *     ECParameters curve_params;
-     *     ECPoint      public;
-     * } ServerECDHParams;
-     */
-    if( ( ret = mbedtls_ecdh_read_params( &ssl->handshake->ecdh_ctx,
-                                  (const unsigned char **) p, end ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_read_params" ), ret );
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-        if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
-            ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS;
-#endif
-        return( ret );
-    }
-
-    if( ssl_check_server_ecdh_params( ssl ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "bad server key exchange message (ECDHE curve)" ) );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    }
-
-    return( ret );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
-static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
-                                      unsigned char **p,
-                                      unsigned char *end )
-{
-    int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
-    uint16_t  len;
-    ((void) ssl);
-
-    /*
-     * PSK parameters:
-     *
-     * opaque psk_identity_hint<0..2^16-1>;
-     */
-    if( end - (*p) < 2 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "bad server key exchange message (psk_identity_hint length)" ) );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    }
-    len = (*p)[0] << 8 | (*p)[1];
-    *p += 2;
-
-    if( end - (*p) < len )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "bad server key exchange message (psk_identity_hint length)" ) );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    }
-
-    /*
-     * Note: we currently ignore the PKS identity hint, as we only allow one
-     * PSK to be provisionned on the client. This could be changed later if
-     * someone needs that feature.
-     */
-    *p += len;
-    ret = 0;
-
-    return( ret );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) ||                           \
-    defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
-/*
- * Generate a pre-master secret and encrypt it with the server's RSA key
- */
-static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
-                                    size_t offset, size_t *olen,
-                                    size_t pms_offset )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2;
-    unsigned char *p = ssl->handshake->premaster + pms_offset;
-    mbedtls_pk_context * peer_pk;
-
-    if( offset + len_bytes > MBEDTLS_SSL_OUT_CONTENT_LEN )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) );
-        return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
-    }
-
-    /*
-     * Generate (part of) the pre-master as
-     *  struct {
-     *      ProtocolVersion client_version;
-     *      opaque random[46];
-     *  } PreMasterSecret;
-     */
-    mbedtls_ssl_write_version( ssl->conf->max_major_ver,
-                               ssl->conf->max_minor_ver,
-                               ssl->conf->transport, p );
-
-    if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p + 2, 46 ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret );
-        return( ret );
-    }
-
-    ssl->handshake->pmslen = 48;
-
-#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
-    peer_pk = &ssl->handshake->peer_pubkey;
-#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-    if( ssl->session_negotiate->peer_cert == NULL )
-    {
-        /* Should never happen */
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-    }
-    peer_pk = &ssl->session_negotiate->peer_cert->pk;
-#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-
-    /*
-     * Now write it out, encrypted
-     */
-    if( ! mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_RSA ) )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate key type mismatch" ) );
-        return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
-    }
-
-    if( ( ret = mbedtls_pk_encrypt( peer_pk,
-                            p, ssl->handshake->pmslen,
-                            ssl->out_msg + offset + len_bytes, olen,
-                            MBEDTLS_SSL_OUT_CONTENT_LEN - offset - len_bytes,
-                            ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret );
-        return( ret );
-    }
-
-#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
-    defined(MBEDTLS_SSL_PROTO_TLS1_2)
-    if( len_bytes == 2 )
-    {
-        ssl->out_msg[offset+0] = (unsigned char)( *olen >> 8 );
-        ssl->out_msg[offset+1] = (unsigned char)( *olen      );
-        *olen += 2;
-    }
-#endif
-
-#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
-    /* We don't need the peer's public key anymore. Free it. */
-    mbedtls_pk_free( peer_pk );
-#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-    return( 0 );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
-
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
-#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) ||                       \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) ||                     \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
-static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl,
-                                          unsigned char **p,
-                                          unsigned char *end,
-                                          mbedtls_md_type_t *md_alg,
-                                          mbedtls_pk_type_t *pk_alg )
-{
-    ((void) ssl);
-    *md_alg = MBEDTLS_MD_NONE;
-    *pk_alg = MBEDTLS_PK_NONE;
-
-    /* Only in TLS 1.2 */
-    if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
-    {
-        return( 0 );
-    }
-
-    if( (*p) + 2 > end )
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-
-    /*
-     * Get hash algorithm
-     */
-    if( ( *md_alg = mbedtls_ssl_md_alg_from_hash( (*p)[0] ) )
-        == MBEDTLS_MD_NONE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "Server used unsupported HashAlgorithm %d", *(p)[0] ) );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    }
-
-    /*
-     * Get signature algorithm
-     */
-    if( ( *pk_alg = mbedtls_ssl_pk_alg_from_sig( (*p)[1] ) )
-        == MBEDTLS_PK_NONE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "server used unsupported SignatureAlgorithm %d", (*p)[1] ) );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    }
-
-    /*
-     * Check if the hash is acceptable
-     */
-    if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "server used HashAlgorithm %d that was not offered", *(p)[0] ) );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d",
-                                (*p)[1] ) );
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d",
-                                (*p)[0] ) );
-    *p += 2;
-
-    return( 0 );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
-static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    const mbedtls_ecp_keypair *peer_key;
-    mbedtls_pk_context * peer_pk;
-
-#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
-    peer_pk = &ssl->handshake->peer_pubkey;
-#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-    if( ssl->session_negotiate->peer_cert == NULL )
-    {
-        /* Should never happen */
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-    }
-    peer_pk = &ssl->session_negotiate->peer_cert->pk;
-#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-
-    if( ! mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_ECKEY ) )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
-        return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
-    }
-
-    peer_key = mbedtls_pk_ec( *peer_pk );
-
-    if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, peer_key,
-                                 MBEDTLS_ECDH_THEIRS ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
-        return( ret );
-    }
-
-    if( ssl_check_server_ecdh_params( ssl ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) );
-        return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
-    }
-
-#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
-    /* We don't need the peer's public key anymore. Free it,
-     * so that more RAM is available for upcoming expensive
-     * operations like ECDHE. */
-    mbedtls_pk_free( peer_pk );
-#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-
-    return( ret );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
-          MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
-
-static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
-        ssl->handshake->ciphersuite_info;
-    unsigned char *p = NULL, *end = NULL;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );
-
-#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
-        ssl->state++;
-        return( 0 );
-    }
-    ((void) p);
-    ((void) end);
-#endif
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
-    {
-        if( ( ret = ssl_get_ecdh_params_from_cert( ssl ) ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_ecdh_params_from_cert", ret );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-            return( ret );
-        }
-
-        MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
-        ssl->state++;
-        return( 0 );
-    }
-    ((void) p);
-    ((void) end);
-#endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
-
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-    if( ssl->handshake->ecrs_enabled &&
-        ssl->handshake->ecrs_state == ssl_ecrs_ske_start_processing )
-    {
-        goto start_processing;
-    }
-#endif
-
-    if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
-        return( ret );
-    }
-
-    if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
-        return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
-    }
-
-    /*
-     * ServerKeyExchange may be skipped with PSK and RSA-PSK when the server
-     * doesn't use a psk_identity_hint
-     */
-    if( ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE )
-    {
-        if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
-            ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
-        {
-            /* Current message is probably either
-             * CertificateRequest or ServerHelloDone */
-            ssl->keep_current_message = 1;
-            goto exit;
-        }
-
-        MBEDTLS_SSL_DEBUG_MSG( 1,
-            ( "server key exchange message must not be skipped" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
-
-        return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
-    }
-
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-    if( ssl->handshake->ecrs_enabled )
-        ssl->handshake->ecrs_state = ssl_ecrs_ske_start_processing;
-
-start_processing:
-#endif
-    p   = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
-    end = ssl->in_msg + ssl->in_hslen;
-    MBEDTLS_SSL_DEBUG_BUF( 3,   "server key exchange", p, end - p );
-
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
-    {
-        if( ssl_parse_server_psk_hint( ssl, &p, end ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-        }
-    } /* FALLTROUGH */
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) ||                       \
-    defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
-        ; /* nothing more to do */
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
-#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) ||                       \
-    defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
-    {
-        if( ssl_parse_server_dh_params( ssl, &p, end ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-        }
-    }
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
-#if defined(MBEDTLS_USE_PSA_CRYPTO) &&                           \
-        ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) ||     \
-          defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) )
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
-    {
-        if( ssl_parse_server_ecdh_params_psa( ssl, &p, end ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-        }
-    }
-    else
-#endif /* MBEDTLS_USE_PSA_CRYPTO &&
-            ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
-              MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) ||                     \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) ||                     \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
-    {
-        if( ssl_parse_server_ecdh_params( ssl, &p, end ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-        }
-    }
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
-    {
-        ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
-                                              p, end - p );
-        if( ret != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-        }
-    }
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-    }
-
-#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
-    if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) )
-    {
-        size_t sig_len, hashlen;
-        unsigned char hash[64];
-        mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
-        mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
-        unsigned char *params = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
-        size_t params_len = p - params;
-        void *rs_ctx = NULL;
-
-        mbedtls_pk_context * peer_pk;
-
-        /*
-         * Handle the digitally-signed structure
-         */
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
-        if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
-        {
-            if( ssl_parse_signature_algorithm( ssl, &p, end,
-                                               &md_alg, &pk_alg ) != 0 )
-            {
-                MBEDTLS_SSL_DEBUG_MSG( 1,
-                    ( "bad server key exchange message" ) );
-                mbedtls_ssl_send_alert_message(
-                    ssl,
-                    MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                    MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-                return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-            }
-
-            if( pk_alg !=
-                mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ) )
-            {
-                MBEDTLS_SSL_DEBUG_MSG( 1,
-                    ( "bad server key exchange message" ) );
-                mbedtls_ssl_send_alert_message(
-                    ssl,
-                    MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                    MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
-                return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-            }
-        }
-        else
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
-#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
-    defined(MBEDTLS_SSL_PROTO_TLS1_1)
-        if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
-        {
-            pk_alg = mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
-
-            /* Default hash for ECDSA is SHA-1 */
-            if( pk_alg == MBEDTLS_PK_ECDSA && md_alg == MBEDTLS_MD_NONE )
-                md_alg = MBEDTLS_MD_SHA1;
-        }
-        else
-#endif
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-        }
-
-        /*
-         * Read signature
-         */
-
-        if( p > end - 2 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-        }
-        sig_len = ( p[0] << 8 ) | p[1];
-        p += 2;
-
-        if( p != end - sig_len )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-            return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
-        }
-
-        MBEDTLS_SSL_DEBUG_BUF( 3, "signature", p, sig_len );
-
-        /*
-         * Compute the hash that has been signed
-         */
-#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
-    defined(MBEDTLS_SSL_PROTO_TLS1_1)
-        if( md_alg == MBEDTLS_MD_NONE )
-        {
-            hashlen = 36;
-            ret = mbedtls_ssl_get_key_exchange_md_ssl_tls( ssl, hash, params,
-                                                           params_len );
-            if( ret != 0 )
-                return( ret );
-        }
-        else
-#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
-          MBEDTLS_SSL_PROTO_TLS1_1 */
-#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
-    defined(MBEDTLS_SSL_PROTO_TLS1_2)
-        if( md_alg != MBEDTLS_MD_NONE )
-        {
-            ret = mbedtls_ssl_get_key_exchange_md_tls1_2( ssl, hash, &hashlen,
-                                                          params, params_len,
-                                                          md_alg );
-            if( ret != 0 )
-                return( ret );
-        }
-        else
-#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
-          MBEDTLS_SSL_PROTO_TLS1_2 */
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-        }
-
-        MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen );
-
-#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
-        peer_pk = &ssl->handshake->peer_pubkey;
-#else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-        if( ssl->session_negotiate->peer_cert == NULL )
-        {
-            /* Should never happen */
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-        }
-        peer_pk = &ssl->session_negotiate->peer_cert->pk;
-#endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-
-        /*
-         * Verify signature
-         */
-        if( !mbedtls_pk_can_do( peer_pk, pk_alg ) )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
-            return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
-        }
-
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-        if( ssl->handshake->ecrs_enabled )
-            rs_ctx = &ssl->handshake->ecrs_ctx.pk;
-#endif
-
-        if( ( ret = mbedtls_pk_verify_restartable( peer_pk,
-                        md_alg, hash, hashlen, p, sig_len, rs_ctx ) ) != 0 )
-        {
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-            if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
-#endif
-                mbedtls_ssl_send_alert_message(
-                    ssl,
-                    MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                    MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR );
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-            if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
-                ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS;
-#endif
-            return( ret );
-        }
-
-#if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
-        /* We don't need the peer's public key anymore. Free it,
-         * so that more RAM is available for upcoming expensive
-         * operations like ECDHE. */
-        mbedtls_pk_free( peer_pk );
-#endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-    }
-#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */
-
-exit:
-    ssl->state++;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) );
-
-    return( 0 );
-}
-
-#if ! defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED)
-static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
-{
-    const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
-        ssl->handshake->ciphersuite_info;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
-
-    if( ! mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
-        ssl->state++;
-        return( 0 );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-    return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-}
-#else /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
-static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    unsigned char *buf;
-    size_t n = 0;
-    size_t cert_type_len = 0, dn_len = 0;
-    const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
-        ssl->handshake->ciphersuite_info;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
-
-    if( ! mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
-        ssl->state++;
-        return( 0 );
-    }
-
-    if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
-        return( ret );
-    }
-
-    if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
-        return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
-    }
-
-    ssl->state++;
-    ssl->client_auth = ( ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE_REQUEST );
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request",
-                        ssl->client_auth ? "a" : "no" ) );
-
-    if( ssl->client_auth == 0 )
-    {
-        /* Current message is probably the ServerHelloDone */
-        ssl->keep_current_message = 1;
-        goto exit;
-    }
-
-    /*
-     *  struct {
-     *      ClientCertificateType certificate_types<1..2^8-1>;
-     *      SignatureAndHashAlgorithm
-     *        supported_signature_algorithms<2^16-1>; -- TLS 1.2 only
-     *      DistinguishedName certificate_authorities<0..2^16-1>;
-     *  } CertificateRequest;
-     *
-     *  Since we only support a single certificate on clients, let's just
-     *  ignore all the information that's supposed to help us pick a
-     *  certificate.
-     *
-     *  We could check that our certificate matches the request, and bail out
-     *  if it doesn't, but it's simpler to just send the certificate anyway,
-     *  and give the server the opportunity to decide if it should terminate
-     *  the connection when it doesn't like our certificate.
-     *
-     *  Same goes for the hash in TLS 1.2's signature_algorithms: at this
-     *  point we only have one hash available (see comments in
-     *  write_certificate_verify), so let's just use what we have.
-     *
-     *  However, we still minimally parse the message to check it is at least
-     *  superficially sane.
-     */
-    buf = ssl->in_msg;
-
-    /* certificate_types */
-    if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
-    }
-    cert_type_len = buf[mbedtls_ssl_hs_hdr_len( ssl )];
-    n = cert_type_len;
-
-    /*
-     * In the subsequent code there are two paths that read from buf:
-     *     * the length of the signature algorithms field (if minor version of
-     *       SSL is 3),
-     *     * distinguished name length otherwise.
-     * Both reach at most the index:
-     *    ...hdr_len + 2 + n,
-     * therefore the buffer length at this point must be greater than that
-     * regardless of the actual code path.
-     */
-    if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
-    }
-
-    /* supported_signature_algorithms */
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
-    if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
-    {
-        size_t sig_alg_len =
-            ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] <<  8 )
-              | ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n]   ) );
-#if defined(MBEDTLS_DEBUG_C)
-        unsigned char* sig_alg;
-        size_t i;
-#endif
-
-        /*
-         * The furthest access in buf is in the loop few lines below:
-         *     sig_alg[i + 1],
-         * where:
-         *     sig_alg = buf + ...hdr_len + 3 + n,
-         *     max(i) = sig_alg_len - 1.
-         * Therefore the furthest access is:
-         *     buf[...hdr_len + 3 + n + sig_alg_len - 1 + 1],
-         * which reduces to:
-         *     buf[...hdr_len + 3 + n + sig_alg_len],
-         * which is one less than we need the buf to be.
-         */
-        if( ssl->in_hslen <= mbedtls_ssl_hs_hdr_len( ssl )
-                                + 3 + n + sig_alg_len )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-            return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
-        }
-
-#if defined(MBEDTLS_DEBUG_C)
-        sig_alg = buf + mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n;
-        for( i = 0; i < sig_alg_len; i += 2 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 3,
-                ( "Supported Signature Algorithm found: %d,%d",
-                  sig_alg[i], sig_alg[i + 1]  ) );
-        }
-#endif
-
-        n += 2 + sig_alg_len;
-    }
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
-
-    /* certificate_authorities */
-    dn_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] <<  8 )
-             | ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n]       ) );
-
-    n += dn_len;
-    if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
-    }
-
-exit:
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
-
-    return( 0 );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
-
-static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) );
-
-    if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
-        return( ret );
-    }
-
-    if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
-        return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
-    }
-
-    if( ssl->in_hslen  != mbedtls_ssl_hs_hdr_len( ssl ) ||
-        ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_HELLO_DONE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO_DONE );
-    }
-
-    ssl->state++;
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-        mbedtls_ssl_recv_flight_completed( ssl );
-#endif
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) );
-
-    return( 0 );
-}
-
-static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-
-    size_t header_len;
-    size_t content_len;
-    const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
-        ssl->handshake->ciphersuite_info;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) );
-
-#if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
-    {
-        /*
-         * DHM key exchange -- send G^X mod P
-         */
-        content_len = ssl->handshake->dhm_ctx.len;
-
-        ssl->out_msg[4] = (unsigned char)( content_len >> 8 );
-        ssl->out_msg[5] = (unsigned char)( content_len      );
-        header_len = 6;
-
-        ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx,
-                          (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
-                          &ssl->out_msg[header_len], content_len,
-                          ssl->conf->f_rng, ssl->conf->p_rng );
-        if( ret != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret );
-            return( ret );
-        }
-
-        MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X  );
-        MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
-
-        if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
-                                  ssl->handshake->premaster,
-                                  MBEDTLS_PREMASTER_SIZE,
-                                  &ssl->handshake->pmslen,
-                                  ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
-            return( ret );
-        }
-
-        MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K  );
-    }
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
-#if defined(MBEDTLS_USE_PSA_CRYPTO) &&                           \
-        ( defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) ||     \
-          defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) )
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
-    {
-        psa_status_t status;
-        psa_key_attributes_t key_attributes;
-
-        mbedtls_ssl_handshake_params *handshake = ssl->handshake;
-
-        unsigned char own_pubkey[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
-        size_t own_pubkey_len;
-        unsigned char *own_pubkey_ecpoint;
-        size_t own_pubkey_ecpoint_len;
-
-        header_len = 4;
-
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "Perform PSA-based ECDH computation." ) );
-
-        /*
-         * Generate EC private key for ECDHE exchange.
-         */
-
-        /* The master secret is obtained from the shared ECDH secret by
-         * applying the TLS 1.2 PRF with a specific salt and label. While
-         * the PSA Crypto API encourages combining key agreement schemes
-         * such as ECDH with fixed KDFs such as TLS 1.2 PRF, it does not
-         * yet support the provisioning of salt + label to the KDF.
-         * For the time being, we therefore need to split the computation
-         * of the ECDH secret and the application of the TLS 1.2 PRF. */
-        key_attributes = psa_key_attributes_init();
-        psa_set_key_usage_flags( &key_attributes, PSA_KEY_USAGE_DERIVE );
-        psa_set_key_algorithm( &key_attributes, PSA_ALG_ECDH );
-        psa_set_key_type( &key_attributes, handshake->ecdh_psa_type );
-        psa_set_key_bits( &key_attributes, handshake->ecdh_bits );
-
-        /* Generate ECDH private key. */
-        status = psa_generate_key( &key_attributes,
-                                   &handshake->ecdh_psa_privkey );
-        if( status != PSA_SUCCESS )
-            return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
-
-        /* Export the public part of the ECDH private key from PSA
-         * and convert it to ECPoint format used in ClientKeyExchange. */
-        status = psa_export_public_key( handshake->ecdh_psa_privkey,
-                                        own_pubkey, sizeof( own_pubkey ),
-                                        &own_pubkey_len );
-        if( status != PSA_SUCCESS )
-            return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
-
-        if( mbedtls_psa_tls_psa_ec_to_ecpoint( own_pubkey,
-                                               own_pubkey_len,
-                                               &own_pubkey_ecpoint,
-                                               &own_pubkey_ecpoint_len ) != 0 )
-        {
-            return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
-        }
-
-        /* Copy ECPoint structure to outgoing message buffer. */
-        ssl->out_msg[header_len] = (unsigned char) own_pubkey_ecpoint_len;
-        memcpy( ssl->out_msg + header_len + 1,
-                own_pubkey_ecpoint, own_pubkey_ecpoint_len );
-        content_len = own_pubkey_ecpoint_len + 1;
-
-        /* The ECDH secret is the premaster secret used for key derivation. */
-
-        /* Compute ECDH shared secret. */
-        status = psa_raw_key_agreement( PSA_ALG_ECDH,
-                                        handshake->ecdh_psa_privkey,
-                                        handshake->ecdh_psa_peerkey,
-                                        handshake->ecdh_psa_peerkey_len,
-                                        ssl->handshake->premaster,
-                                        sizeof( ssl->handshake->premaster ),
-                                        &ssl->handshake->pmslen );
-        if( status != PSA_SUCCESS )
-            return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
-
-        status = psa_destroy_key( handshake->ecdh_psa_privkey );
-        if( status != PSA_SUCCESS )
-            return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
-        handshake->ecdh_psa_privkey = MBEDTLS_SVC_KEY_ID_INIT;
-    }
-    else
-#endif /* MBEDTLS_USE_PSA_CRYPTO &&
-            ( MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
-              MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ) */
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) ||                     \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) ||                   \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||                      \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA ||
-        ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
-    {
-        /*
-         * ECDH key exchange -- send client public value
-         */
-        header_len = 4;
-
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-        if( ssl->handshake->ecrs_enabled )
-        {
-            if( ssl->handshake->ecrs_state == ssl_ecrs_cke_ecdh_calc_secret )
-                goto ecdh_calc_secret;
-
-            mbedtls_ecdh_enable_restart( &ssl->handshake->ecdh_ctx );
-        }
-#endif
-
-        ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx,
-                                &content_len,
-                                &ssl->out_msg[header_len], 1000,
-                                ssl->conf->f_rng, ssl->conf->p_rng );
-        if( ret != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret );
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-            if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
-                ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS;
-#endif
-            return( ret );
-        }
-
-        MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
-                                MBEDTLS_DEBUG_ECDH_Q );
-
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-        if( ssl->handshake->ecrs_enabled )
-        {
-            ssl->handshake->ecrs_n = content_len;
-            ssl->handshake->ecrs_state = ssl_ecrs_cke_ecdh_calc_secret;
-        }
-
-ecdh_calc_secret:
-        if( ssl->handshake->ecrs_enabled )
-            content_len = ssl->handshake->ecrs_n;
-#endif
-        if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
-                                  &ssl->handshake->pmslen,
-                                  ssl->handshake->premaster,
-                                  MBEDTLS_MPI_MAX_SIZE,
-                                  ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-            if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
-                ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS;
-#endif
-            return( ret );
-        }
-
-        MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
-                                MBEDTLS_DEBUG_ECDH_Z );
-    }
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
-          MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
-    if( mbedtls_ssl_ciphersuite_uses_psk( ciphersuite_info ) )
-    {
-        /*
-         * opaque psk_identity<0..2^16-1>;
-         */
-        if( ssl_conf_has_static_psk( ssl->conf ) == 0 )
-        {
-            /* We don't offer PSK suites if we don't have a PSK,
-             * and we check that the server's choice is among the
-             * ciphersuites we offered, so this should never happen. */
-            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-        }
-
-        header_len = 4;
-        content_len = ssl->conf->psk_identity_len;
-
-        if( header_len + 2 + content_len > MBEDTLS_SSL_OUT_CONTENT_LEN )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1,
-                ( "psk identity too long or SSL buffer too short" ) );
-            return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
-        }
-
-        ssl->out_msg[header_len++] = (unsigned char)( content_len >> 8 );
-        ssl->out_msg[header_len++] = (unsigned char)( content_len      );
-
-        memcpy( ssl->out_msg + header_len,
-                ssl->conf->psk_identity,
-                ssl->conf->psk_identity_len );
-        header_len += ssl->conf->psk_identity_len;
-
-#if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
-        if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
-        {
-            content_len = 0;
-        }
-        else
-#endif
-#if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
-        if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
-        {
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-            /* Opaque PSKs are currently only supported for PSK-only suites. */
-            if( ssl_conf_has_static_raw_psk( ssl->conf ) == 0 )
-                return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-            if( ( ret = ssl_write_encrypted_pms( ssl, header_len,
-                                                 &content_len, 2 ) ) != 0 )
-                return( ret );
-        }
-        else
-#endif
-#if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
-        if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
-        {
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-            /* Opaque PSKs are currently only supported for PSK-only suites. */
-            if( ssl_conf_has_static_raw_psk( ssl->conf ) == 0 )
-                return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-            /*
-             * ClientDiffieHellmanPublic public (DHM send G^X mod P)
-             */
-            content_len = ssl->handshake->dhm_ctx.len;
-
-            if( header_len + 2 + content_len >
-                MBEDTLS_SSL_OUT_CONTENT_LEN )
-            {
-                MBEDTLS_SSL_DEBUG_MSG( 1,
-                    ( "psk identity or DHM size too long or SSL buffer too short" ) );
-                return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
-            }
-
-            ssl->out_msg[header_len++] = (unsigned char)( content_len >> 8 );
-            ssl->out_msg[header_len++] = (unsigned char)( content_len      );
-
-            ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx,
-                    (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
-                    &ssl->out_msg[header_len], content_len,
-                    ssl->conf->f_rng, ssl->conf->p_rng );
-            if( ret != 0 )
-            {
-                MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret );
-                return( ret );
-            }
-        }
-        else
-#endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
-#if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
-        if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
-        {
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-            /* Opaque PSKs are currently only supported for PSK-only suites. */
-            if( ssl_conf_has_static_raw_psk( ssl->conf ) == 0 )
-                return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-            /*
-             * ClientECDiffieHellmanPublic public;
-             */
-            ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx,
-                    &content_len,
-                    &ssl->out_msg[header_len],
-                    MBEDTLS_SSL_OUT_CONTENT_LEN - header_len,
-                    ssl->conf->f_rng, ssl->conf->p_rng );
-            if( ret != 0 )
-            {
-                MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret );
-                return( ret );
-            }
-
-            MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
-                                    MBEDTLS_DEBUG_ECDH_Q );
-        }
-        else
-#endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-            return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-        }
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO) &&          \
-    defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
-        if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK &&
-            ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
-            ssl_conf_has_static_raw_psk( ssl->conf ) == 0 )
-        {
-            MBEDTLS_SSL_DEBUG_MSG( 1,
-                ( "skip PMS generation for opaque PSK" ) );
-        }
-        else
-#endif /* MBEDTLS_USE_PSA_CRYPTO &&
-          MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
-        if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
-                        ciphersuite_info->key_exchange ) ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1,
-                "mbedtls_ssl_psk_derive_premaster", ret );
-            return( ret );
-        }
-    }
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
-#if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
-    {
-        header_len = 4;
-        if( ( ret = ssl_write_encrypted_pms( ssl, header_len,
-                                             &content_len, 0 ) ) != 0 )
-            return( ret );
-    }
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-    if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
-    {
-        header_len = 4;
-
-        ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx,
-                ssl->out_msg + header_len,
-                MBEDTLS_SSL_OUT_CONTENT_LEN - header_len,
-                &content_len,
-                ssl->conf->f_rng, ssl->conf->p_rng );
-        if( ret != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
-            return( ret );
-        }
-
-        ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
-                ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
-                ssl->conf->f_rng, ssl->conf->p_rng );
-        if( ret != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
-            return( ret );
-        }
-    }
-    else
-#endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
-    {
-        ((void) ciphersuite_info);
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-    }
-
-    ssl->out_msglen  = header_len + content_len;
-    ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
-    ssl->out_msg[0]  = MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE;
-
-    ssl->state++;
-
-    if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
-        return( ret );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client key exchange" ) );
-
-    return( 0 );
-}
-
-#if !defined(MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED)
-static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
-{
-    const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
-        ssl->handshake->ciphersuite_info;
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
-
-    if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
-        return( ret );
-    }
-
-    if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
-        ssl->state++;
-        return( 0 );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-    return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-}
-#else /* !MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
-static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
-    const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
-        ssl->handshake->ciphersuite_info;
-    size_t n = 0, offset = 0;
-    unsigned char hash[48];
-    unsigned char *hash_start = hash;
-    mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
-    size_t hashlen;
-    void *rs_ctx = NULL;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
-
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-    if( ssl->handshake->ecrs_enabled &&
-        ssl->handshake->ecrs_state == ssl_ecrs_crt_vrfy_sign )
-    {
-        goto sign;
-    }
-#endif
-
-    if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
-        return( ret );
-    }
-
-    if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
-        ssl->state++;
-        return( 0 );
-    }
-
-    if( ssl->client_auth == 0 || mbedtls_ssl_own_cert( ssl ) == NULL )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
-        ssl->state++;
-        return( 0 );
-    }
-
-    if( mbedtls_ssl_own_key( ssl ) == NULL )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for certificate" ) );
-        return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
-    }
-
-    /*
-     * Make a signature of the handshake digests
-     */
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-    if( ssl->handshake->ecrs_enabled )
-        ssl->handshake->ecrs_state = ssl_ecrs_crt_vrfy_sign;
-
-sign:
-#endif
-
-    ssl->handshake->calc_verify( ssl, hash, &hashlen );
-
-#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
-    defined(MBEDTLS_SSL_PROTO_TLS1_1)
-    if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
-    {
-        /*
-         * digitally-signed struct {
-         *     opaque md5_hash[16];
-         *     opaque sha_hash[20];
-         * };
-         *
-         * md5_hash
-         *     MD5(handshake_messages);
-         *
-         * sha_hash
-         *     SHA(handshake_messages);
-         */
-        md_alg = MBEDTLS_MD_NONE;
-
-        /*
-         * For ECDSA, default hash is SHA-1 only
-         */
-        if( mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECDSA ) )
-        {
-            hash_start += 16;
-            hashlen -= 16;
-            md_alg = MBEDTLS_MD_SHA1;
-        }
-    }
-    else
-#endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
-          MBEDTLS_SSL_PROTO_TLS1_1 */
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
-    if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
-    {
-        /*
-         * digitally-signed struct {
-         *     opaque handshake_messages[handshake_messages_length];
-         * };
-         *
-         * Taking shortcut here. We assume that the server always allows the
-         * PRF Hash function and has sent it in the allowed signature
-         * algorithms list received in the Certificate Request message.
-         *
-         * Until we encounter a server that does not, we will take this
-         * shortcut.
-         *
-         * Reason: Otherwise we should have running hashes for SHA512 and
-         *         SHA224 in order to satisfy 'weird' needs from the server
-         *         side.
-         */
-        if( ssl->handshake->ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
-        {
-            md_alg = MBEDTLS_MD_SHA384;
-            ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA384;
-        }
-        else
-        {
-            md_alg = MBEDTLS_MD_SHA256;
-            ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA256;
-        }
-        ssl->out_msg[5] = mbedtls_ssl_sig_from_pk( mbedtls_ssl_own_key( ssl ) );
-
-        /* Info from md_alg will be used instead */
-        hashlen = 0;
-        offset = 2;
-    }
-    else
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
-        return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
-    }
-
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-    if( ssl->handshake->ecrs_enabled )
-        rs_ctx = &ssl->handshake->ecrs_ctx.pk;
-#endif
-
-    if( ( ret = mbedtls_pk_sign_restartable( mbedtls_ssl_own_key( ssl ),
-                         md_alg, hash_start, hashlen,
-                         ssl->out_msg + 6 + offset, &n,
-                         ssl->conf->f_rng, ssl->conf->p_rng, rs_ctx ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-        if( ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
-            ret = MBEDTLS_ERR_SSL_CRYPTO_IN_PROGRESS;
-#endif
-        return( ret );
-    }
-
-    ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 );
-    ssl->out_msg[5 + offset] = (unsigned char)( n      );
-
-    ssl->out_msglen  = 6 + n + offset;
-    ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
-    ssl->out_msg[0]  = MBEDTLS_SSL_HS_CERTIFICATE_VERIFY;
-
-    ssl->state++;
-
-    if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
-        return( ret );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) );
-
-    return( ret );
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_CERT_REQ_ALLOWED_ENABLED */
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl )
-{
-    int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    uint32_t lifetime;
-    size_t ticket_len;
-    unsigned char *ticket;
-    const unsigned char *msg;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse new session ticket" ) );
-
-    if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
-    {
-        MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
-        return( ret );
-    }
-
-    if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
-        mbedtls_ssl_send_alert_message(
-            ssl,
-            MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-            MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
-        return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
-    }
-
-    /*
-     * struct {
-     *     uint32 ticket_lifetime_hint;
-     *     opaque ticket<0..2^16-1>;
-     * } NewSessionTicket;
-     *
-     * 0  .  3   ticket_lifetime_hint
-     * 4  .  5   ticket_len (n)
-     * 6  .  5+n ticket content
-     */
-    if( ssl->in_msg[0] != MBEDTLS_SSL_HS_NEW_SESSION_TICKET ||
-        ssl->in_hslen < 6 + mbedtls_ssl_hs_hdr_len( ssl ) )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
-    }
-
-    msg = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
-
-    lifetime = ( ((uint32_t) msg[0]) << 24 ) | ( msg[1] << 16 ) |
-               ( msg[2] << 8 ) | ( msg[3] );
-
-    ticket_len = ( msg[4] << 8 ) | ( msg[5] );
-
-    if( ticket_len + 6 + mbedtls_ssl_hs_hdr_len( ssl ) != ssl->in_hslen )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
-        return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
-    }
-
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %" MBEDTLS_PRINTF_SIZET, ticket_len ) );
-
-    /* We're not waiting for a NewSessionTicket message any more */
-    ssl->handshake->new_session_ticket = 0;
-    ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
-
-    /*
-     * Zero-length ticket means the server changed his mind and doesn't want
-     * to send a ticket after all, so just forget it
-     */
-    if( ticket_len == 0 )
-        return( 0 );
-
-    if( ssl->session != NULL && ssl->session->ticket != NULL )
-    {
-        mbedtls_platform_zeroize( ssl->session->ticket,
-                                  ssl->session->ticket_len );
-        mbedtls_free( ssl->session->ticket );
-        ssl->session->ticket = NULL;
-        ssl->session->ticket_len = 0;
-    }
-
-    mbedtls_platform_zeroize( ssl->session_negotiate->ticket,
-                              ssl->session_negotiate->ticket_len );
-    mbedtls_free( ssl->session_negotiate->ticket );
-    ssl->session_negotiate->ticket = NULL;
-    ssl->session_negotiate->ticket_len = 0;
-
-    if( ( ticket = mbedtls_calloc( 1, ticket_len ) ) == NULL )
-    {
-        MBEDTLS_SSL_DEBUG_MSG( 1, ( "ticket alloc failed" ) );
-        mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                                        MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
-        return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
-    }
-
-    memcpy( ticket, msg + 6, ticket_len );
-
-    ssl->session_negotiate->ticket = ticket;
-    ssl->session_negotiate->ticket_len = ticket_len;
-    ssl->session_negotiate->ticket_lifetime = lifetime;
-
-    /*
-     * RFC 5077 section 3.4:
-     * "If the client receives a session ticket from the server, then it
-     * discards any Session ID that was sent in the ServerHello."
-     */
-    MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket in use, discarding session id" ) );
-    ssl->session_negotiate->id_len = 0;
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse new session ticket" ) );
-
-    return( 0 );
-}
-#endif /* MBEDTLS_SSL_SESSION_TICKETS */
-
-/*
- * SSL handshake -- client side -- single step
- */
-int mbedtls_ssl_handshake_client_step( mbedtls_ssl_context *ssl )
-{
-    int ret = 0;
-
-    if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL )
-        return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
-
-    MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) );
-
-    if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
-        return( ret );
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
-        ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
-    {
-        if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
-            return( ret );
-    }
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-
-    /* Change state now, so that it is right in mbedtls_ssl_read_record(), used
-     * by DTLS for dropping out-of-sequence ChangeCipherSpec records */
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-    if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC &&
-        ssl->handshake->new_session_ticket != 0 )
-    {
-        ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET;
-    }
-#endif
-
-    switch( ssl->state )
-    {
-        case MBEDTLS_SSL_HELLO_REQUEST:
-            ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
-            break;
-
-       /*
-        *  ==>   ClientHello
-        */
-       case MBEDTLS_SSL_CLIENT_HELLO:
-           ret = ssl_write_client_hello( ssl );
-           break;
-
-       /*
-        *  <==   ServerHello
-        *        Certificate
-        *      ( ServerKeyExchange  )
-        *      ( CertificateRequest )
-        *        ServerHelloDone
-        */
-       case MBEDTLS_SSL_SERVER_HELLO:
-           ret = ssl_parse_server_hello( ssl );
-           break;
-
-       case MBEDTLS_SSL_SERVER_CERTIFICATE:
-           ret = mbedtls_ssl_parse_certificate( ssl );
-           break;
-
-       case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
-           ret = ssl_parse_server_key_exchange( ssl );
-           break;
-
-       case MBEDTLS_SSL_CERTIFICATE_REQUEST:
-           ret = ssl_parse_certificate_request( ssl );
-           break;
-
-       case MBEDTLS_SSL_SERVER_HELLO_DONE:
-           ret = ssl_parse_server_hello_done( ssl );
-           break;
-
-       /*
-        *  ==> ( Certificate/Alert  )
-        *        ClientKeyExchange
-        *      ( CertificateVerify  )
-        *        ChangeCipherSpec
-        *        Finished
-        */
-       case MBEDTLS_SSL_CLIENT_CERTIFICATE:
-           ret = mbedtls_ssl_write_certificate( ssl );
-           break;
-
-       case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
-           ret = ssl_write_client_key_exchange( ssl );
-           break;
-
-       case MBEDTLS_SSL_CERTIFICATE_VERIFY:
-           ret = ssl_write_certificate_verify( ssl );
-           break;
-
-       case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
-           ret = mbedtls_ssl_write_change_cipher_spec( ssl );
-           break;
-
-       case MBEDTLS_SSL_CLIENT_FINISHED:
-           ret = mbedtls_ssl_write_finished( ssl );
-           break;
-
-       /*
-        *  <==   ( NewSessionTicket )
-        *        ChangeCipherSpec
-        *        Finished
-        */
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-       case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET:
-           ret = ssl_parse_new_session_ticket( ssl );
-           break;
-#endif
-
-       case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
-           ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
-           break;
-
-       case MBEDTLS_SSL_SERVER_FINISHED:
-           ret = mbedtls_ssl_parse_finished( ssl );
-           break;
-
-       case MBEDTLS_SSL_FLUSH_BUFFERS:
-           MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
-           ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
-           break;
-
-       case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
-           mbedtls_ssl_handshake_wrapup( ssl );
-           break;
-
-       default:
-           MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
-           return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
-   }
-
-    return( ret );
-}
-#endif /* MBEDTLS_SSL_CLI_C */