Removed old mbedtls, replacing with submodule.

1 files changed, 0 insertions, 1309 deletions

diff --git a/lib/mbedtls-2.27.0/include/mbedtls/ssl_internal.h b/lib/mbedtls-2.27.0/include/mbedtls/ssl_internal.h
deleted file mode 100644
index 2097a6d..0000000
--- a/lib/mbedtls-2.27.0/include/mbedtls/ssl_internal.h
+++ /dev/null
@@ -1,1309 +0,0 @@
-/**
- * \file ssl_internal.h
- *
- * \brief Internal functions shared by the SSL modules
- */
-/*
- *  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.
- */
-#ifndef MBEDTLS_SSL_INTERNAL_H
-#define MBEDTLS_SSL_INTERNAL_H
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#include "mbedtls/ssl.h"
-#include "mbedtls/cipher.h"
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-#include "psa/crypto.h"
-#endif
-
-#if defined(MBEDTLS_MD5_C)
-#include "mbedtls/md5.h"
-#endif
-
-#if defined(MBEDTLS_SHA1_C)
-#include "mbedtls/sha1.h"
-#endif
-
-#if defined(MBEDTLS_SHA256_C)
-#include "mbedtls/sha256.h"
-#endif
-
-#if defined(MBEDTLS_SHA512_C)
-#include "mbedtls/sha512.h"
-#endif
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-#include "mbedtls/ecjpake.h"
-#endif
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-#include "psa/crypto.h"
-#include "mbedtls/psa_util.h"
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-#if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
-    !defined(inline) && !defined(__cplusplus)
-#define inline __inline
-#endif
-
-/* Determine minimum supported version */
-#define MBEDTLS_SSL_MIN_MAJOR_VERSION           MBEDTLS_SSL_MAJOR_VERSION_3
-
-#if defined(MBEDTLS_SSL_PROTO_SSL3)
-#define MBEDTLS_SSL_MIN_MINOR_VERSION           MBEDTLS_SSL_MINOR_VERSION_0
-#else
-#if defined(MBEDTLS_SSL_PROTO_TLS1)
-#define MBEDTLS_SSL_MIN_MINOR_VERSION           MBEDTLS_SSL_MINOR_VERSION_1
-#else
-#if defined(MBEDTLS_SSL_PROTO_TLS1_1)
-#define MBEDTLS_SSL_MIN_MINOR_VERSION           MBEDTLS_SSL_MINOR_VERSION_2
-#else
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
-#define MBEDTLS_SSL_MIN_MINOR_VERSION           MBEDTLS_SSL_MINOR_VERSION_3
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
-#endif /* MBEDTLS_SSL_PROTO_TLS1_1 */
-#endif /* MBEDTLS_SSL_PROTO_TLS1   */
-#endif /* MBEDTLS_SSL_PROTO_SSL3   */
-
-#define MBEDTLS_SSL_MIN_VALID_MINOR_VERSION MBEDTLS_SSL_MINOR_VERSION_1
-#define MBEDTLS_SSL_MIN_VALID_MAJOR_VERSION MBEDTLS_SSL_MAJOR_VERSION_3
-
-/* Determine maximum supported version */
-#define MBEDTLS_SSL_MAX_MAJOR_VERSION           MBEDTLS_SSL_MAJOR_VERSION_3
-
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
-#define MBEDTLS_SSL_MAX_MINOR_VERSION           MBEDTLS_SSL_MINOR_VERSION_3
-#else
-#if defined(MBEDTLS_SSL_PROTO_TLS1_1)
-#define MBEDTLS_SSL_MAX_MINOR_VERSION           MBEDTLS_SSL_MINOR_VERSION_2
-#else
-#if defined(MBEDTLS_SSL_PROTO_TLS1)
-#define MBEDTLS_SSL_MAX_MINOR_VERSION           MBEDTLS_SSL_MINOR_VERSION_1
-#else
-#if defined(MBEDTLS_SSL_PROTO_SSL3)
-#define MBEDTLS_SSL_MAX_MINOR_VERSION           MBEDTLS_SSL_MINOR_VERSION_0
-#endif /* MBEDTLS_SSL_PROTO_SSL3   */
-#endif /* MBEDTLS_SSL_PROTO_TLS1   */
-#endif /* MBEDTLS_SSL_PROTO_TLS1_1 */
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
-
-/* Shorthand for restartable ECC */
-#if defined(MBEDTLS_ECP_RESTARTABLE) && \
-    defined(MBEDTLS_SSL_CLI_C) && \
-    defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
-    defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
-#define MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED
-#endif
-
-#define MBEDTLS_SSL_INITIAL_HANDSHAKE           0
-#define MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS   1   /* In progress */
-#define MBEDTLS_SSL_RENEGOTIATION_DONE          2   /* Done or aborted */
-#define MBEDTLS_SSL_RENEGOTIATION_PENDING       3   /* Requested (server only) */
-
-/*
- * DTLS retransmission states, see RFC 6347 4.2.4
- *
- * The SENDING state is merged in PREPARING for initial sends,
- * but is distinct for resends.
- *
- * Note: initial state is wrong for server, but is not used anyway.
- */
-#define MBEDTLS_SSL_RETRANS_PREPARING       0
-#define MBEDTLS_SSL_RETRANS_SENDING         1
-#define MBEDTLS_SSL_RETRANS_WAITING         2
-#define MBEDTLS_SSL_RETRANS_FINISHED        3
-
-/*
- * Allow extra bytes for record, authentication and encryption overhead:
- * counter (8) + header (5) + IV(16) + MAC (16-48) + padding (0-256)
- * and allow for a maximum of 1024 of compression expansion if
- * enabled.
- */
-#if defined(MBEDTLS_ZLIB_SUPPORT)
-#define MBEDTLS_SSL_COMPRESSION_ADD          1024
-#else
-#define MBEDTLS_SSL_COMPRESSION_ADD             0
-#endif
-
-/* This macro determines whether CBC is supported. */
-#if defined(MBEDTLS_CIPHER_MODE_CBC) &&                               \
-    ( defined(MBEDTLS_AES_C)      ||                                  \
-      defined(MBEDTLS_CAMELLIA_C) ||                                  \
-      defined(MBEDTLS_ARIA_C)     ||                                  \
-      defined(MBEDTLS_DES_C) )
-#define MBEDTLS_SSL_SOME_SUITES_USE_CBC
-#endif
-
-/* This macro determines whether the CBC construct used in TLS 1.0-1.2 (as
- * opposed to the very different CBC construct used in SSLv3) is supported. */
-#if defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC) && \
-    ( defined(MBEDTLS_SSL_PROTO_TLS1) ||        \
-      defined(MBEDTLS_SSL_PROTO_TLS1_1) ||      \
-      defined(MBEDTLS_SSL_PROTO_TLS1_2) )
-#define MBEDTLS_SSL_SOME_SUITES_USE_TLS_CBC
-#endif
-
-#if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) ||   \
-    defined(MBEDTLS_SSL_SOME_SUITES_USE_CBC)
-#define MBEDTLS_SSL_SOME_MODES_USE_MAC
-#endif
-
-#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
-/* Ciphersuites using HMAC */
-#if defined(MBEDTLS_SHA512_C)
-#define MBEDTLS_SSL_MAC_ADD                 48  /* SHA-384 used for HMAC */
-#elif defined(MBEDTLS_SHA256_C)
-#define MBEDTLS_SSL_MAC_ADD                 32  /* SHA-256 used for HMAC */
-#else
-#define MBEDTLS_SSL_MAC_ADD                 20  /* SHA-1   used for HMAC */
-#endif
-#else /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
-/* AEAD ciphersuites: GCM and CCM use a 128 bits tag */
-#define MBEDTLS_SSL_MAC_ADD                 16
-#endif
-
-#if defined(MBEDTLS_CIPHER_MODE_CBC)
-#define MBEDTLS_SSL_PADDING_ADD            256
-#else
-#define MBEDTLS_SSL_PADDING_ADD              0
-#endif
-
-#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-#define MBEDTLS_SSL_MAX_CID_EXPANSION      MBEDTLS_SSL_CID_PADDING_GRANULARITY
-#else
-#define MBEDTLS_SSL_MAX_CID_EXPANSION        0
-#endif
-
-#define MBEDTLS_SSL_PAYLOAD_OVERHEAD ( MBEDTLS_SSL_COMPRESSION_ADD +    \
-                                       MBEDTLS_MAX_IV_LENGTH +          \
-                                       MBEDTLS_SSL_MAC_ADD +            \
-                                       MBEDTLS_SSL_PADDING_ADD +        \
-                                       MBEDTLS_SSL_MAX_CID_EXPANSION    \
-                                       )
-
-#define MBEDTLS_SSL_IN_PAYLOAD_LEN ( MBEDTLS_SSL_PAYLOAD_OVERHEAD + \
-                                     ( MBEDTLS_SSL_IN_CONTENT_LEN ) )
-
-#define MBEDTLS_SSL_OUT_PAYLOAD_LEN ( MBEDTLS_SSL_PAYLOAD_OVERHEAD + \
-                                      ( MBEDTLS_SSL_OUT_CONTENT_LEN ) )
-
-/* The maximum number of buffered handshake messages. */
-#define MBEDTLS_SSL_MAX_BUFFERED_HS 4
-
-/* Maximum length we can advertise as our max content length for
-   RFC 6066 max_fragment_length extension negotiation purposes
-   (the lesser of both sizes, if they are unequal.)
- */
-#define MBEDTLS_TLS_EXT_ADV_CONTENT_LEN (                            \
-        (MBEDTLS_SSL_IN_CONTENT_LEN > MBEDTLS_SSL_OUT_CONTENT_LEN)   \
-        ? ( MBEDTLS_SSL_OUT_CONTENT_LEN )                            \
-        : ( MBEDTLS_SSL_IN_CONTENT_LEN )                             \
-        )
-
-/* Maximum size in bytes of list in sig-hash algorithm ext., RFC 5246 */
-#define MBEDTLS_SSL_MAX_SIG_HASH_ALG_LIST_LEN  65534
-
-/* Maximum size in bytes of list in supported elliptic curve ext., RFC 4492 */
-#define MBEDTLS_SSL_MAX_CURVE_LIST_LEN         65535
-
-/*
- * Check that we obey the standard's message size bounds
- */
-
-#if MBEDTLS_SSL_MAX_CONTENT_LEN > 16384
-#error "Bad configuration - record content too large."
-#endif
-
-#if MBEDTLS_SSL_IN_CONTENT_LEN > MBEDTLS_SSL_MAX_CONTENT_LEN
-#error "Bad configuration - incoming record content should not be larger than MBEDTLS_SSL_MAX_CONTENT_LEN."
-#endif
-
-#if MBEDTLS_SSL_OUT_CONTENT_LEN > MBEDTLS_SSL_MAX_CONTENT_LEN
-#error "Bad configuration - outgoing record content should not be larger than MBEDTLS_SSL_MAX_CONTENT_LEN."
-#endif
-
-#if MBEDTLS_SSL_IN_PAYLOAD_LEN > MBEDTLS_SSL_MAX_CONTENT_LEN + 2048
-#error "Bad configuration - incoming protected record payload too large."
-#endif
-
-#if MBEDTLS_SSL_OUT_PAYLOAD_LEN > MBEDTLS_SSL_MAX_CONTENT_LEN + 2048
-#error "Bad configuration - outgoing protected record payload too large."
-#endif
-
-/* Calculate buffer sizes */
-
-/* Note: Even though the TLS record header is only 5 bytes
-   long, we're internally using 8 bytes to store the
-   implicit sequence number. */
-#define MBEDTLS_SSL_HEADER_LEN 13
-
-#if !defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-#define MBEDTLS_SSL_IN_BUFFER_LEN  \
-    ( ( MBEDTLS_SSL_HEADER_LEN ) + ( MBEDTLS_SSL_IN_PAYLOAD_LEN ) )
-#else
-#define MBEDTLS_SSL_IN_BUFFER_LEN  \
-    ( ( MBEDTLS_SSL_HEADER_LEN ) + ( MBEDTLS_SSL_IN_PAYLOAD_LEN ) \
-      + ( MBEDTLS_SSL_CID_IN_LEN_MAX ) )
-#endif
-
-#if !defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-#define MBEDTLS_SSL_OUT_BUFFER_LEN  \
-    ( ( MBEDTLS_SSL_HEADER_LEN ) + ( MBEDTLS_SSL_OUT_PAYLOAD_LEN ) )
-#else
-#define MBEDTLS_SSL_OUT_BUFFER_LEN                               \
-    ( ( MBEDTLS_SSL_HEADER_LEN ) + ( MBEDTLS_SSL_OUT_PAYLOAD_LEN )    \
-      + ( MBEDTLS_SSL_CID_OUT_LEN_MAX ) )
-#endif
-
-#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
-static inline size_t mbedtls_ssl_get_output_buflen( const mbedtls_ssl_context *ctx )
-{
-#if defined (MBEDTLS_SSL_DTLS_CONNECTION_ID)
-    return mbedtls_ssl_get_output_max_frag_len( ctx )
-               + MBEDTLS_SSL_HEADER_LEN + MBEDTLS_SSL_PAYLOAD_OVERHEAD
-               + MBEDTLS_SSL_CID_OUT_LEN_MAX;
-#else
-    return mbedtls_ssl_get_output_max_frag_len( ctx )
-               + MBEDTLS_SSL_HEADER_LEN + MBEDTLS_SSL_PAYLOAD_OVERHEAD;
-#endif
-}
-
-static inline size_t mbedtls_ssl_get_input_buflen( const mbedtls_ssl_context *ctx )
-{
-#if defined (MBEDTLS_SSL_DTLS_CONNECTION_ID)
-    return mbedtls_ssl_get_input_max_frag_len( ctx )
-               + MBEDTLS_SSL_HEADER_LEN + MBEDTLS_SSL_PAYLOAD_OVERHEAD
-               + MBEDTLS_SSL_CID_IN_LEN_MAX;
-#else
-    return mbedtls_ssl_get_input_max_frag_len( ctx )
-               + MBEDTLS_SSL_HEADER_LEN + MBEDTLS_SSL_PAYLOAD_OVERHEAD;
-#endif
-}
-#endif
-
-#ifdef MBEDTLS_ZLIB_SUPPORT
-/* Compression buffer holds both IN and OUT buffers, so should be size of the larger */
-#define MBEDTLS_SSL_COMPRESS_BUFFER_LEN (                               \
-        ( MBEDTLS_SSL_IN_BUFFER_LEN > MBEDTLS_SSL_OUT_BUFFER_LEN )      \
-        ? MBEDTLS_SSL_IN_BUFFER_LEN                                     \
-        : MBEDTLS_SSL_OUT_BUFFER_LEN                                    \
-        )
-#endif
-
-/*
- * TLS extension flags (for extensions with outgoing ServerHello content
- * that need it (e.g. for RENEGOTIATION_INFO the server already knows because
- * of state of the renegotiation flag, so no indicator is required)
- */
-#define MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT (1 << 0)
-#define MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK                 (1 << 1)
-
-/**
- * \brief        This function checks if the remaining size in a buffer is
- *               greater or equal than a needed space.
- *
- * \param cur    Pointer to the current position in the buffer.
- * \param end    Pointer to one past the end of the buffer.
- * \param need   Needed space in bytes.
- *
- * \return       Zero if the needed space is available in the buffer, non-zero
- *               otherwise.
- */
-static inline int mbedtls_ssl_chk_buf_ptr( const uint8_t *cur,
-                                           const uint8_t *end, size_t need )
-{
-    return( ( cur > end ) || ( need > (size_t)( end - cur ) ) );
-}
-
-/**
- * \brief        This macro checks if the remaining size in a buffer is
- *               greater or equal than a needed space. If it is not the case,
- *               it returns an SSL_BUFFER_TOO_SMALL error.
- *
- * \param cur    Pointer to the current position in the buffer.
- * \param end    Pointer to one past the end of the buffer.
- * \param need   Needed space in bytes.
- *
- */
-#define MBEDTLS_SSL_CHK_BUF_PTR( cur, end, need )                        \
-    do {                                                                 \
-        if( mbedtls_ssl_chk_buf_ptr( ( cur ), ( end ), ( need ) ) != 0 ) \
-        {                                                                \
-            return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );                  \
-        }                                                                \
-    } while( 0 )
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
-    defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
-/*
- * Abstraction for a grid of allowed signature-hash-algorithm pairs.
- */
-struct mbedtls_ssl_sig_hash_set_t
-{
-    /* At the moment, we only need to remember a single suitable
-     * hash algorithm per signature algorithm. As long as that's
-     * the case - and we don't need a general lookup function -
-     * we can implement the sig-hash-set as a map from signatures
-     * to hash algorithms. */
-    mbedtls_md_type_t rsa;
-    mbedtls_md_type_t ecdsa;
-};
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
-          MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
-
-typedef int  mbedtls_ssl_tls_prf_cb( const unsigned char *secret, size_t slen,
-                                     const char *label,
-                                     const unsigned char *random, size_t rlen,
-                                     unsigned char *dstbuf, size_t dlen );
-
-/* cipher.h exports the maximum IV, key and block length from
- * all ciphers enabled in the config, regardless of whether those
- * ciphers are actually usable in SSL/TLS. Notably, XTS is enabled
- * in the default configuration and uses 64 Byte keys, but it is
- * not used for record protection in SSL/TLS.
- *
- * In order to prevent unnecessary inflation of key structures,
- * we introduce SSL-specific variants of the max-{key,block,IV}
- * macros here which are meant to only take those ciphers into
- * account which can be negotiated in SSL/TLS.
- *
- * Since the current definitions of MBEDTLS_MAX_{KEY|BLOCK|IV}_LENGTH
- * in cipher.h are rough overapproximations of the real maxima, here
- * we content ourselves with replicating those overapproximations
- * for the maximum block and IV length, and excluding XTS from the
- * computation of the maximum key length. */
-#define MBEDTLS_SSL_MAX_BLOCK_LENGTH 16
-#define MBEDTLS_SSL_MAX_IV_LENGTH    16
-#define MBEDTLS_SSL_MAX_KEY_LENGTH   32
-
-/**
- * \brief   The data structure holding the cryptographic material (key and IV)
- *          used for record protection in TLS 1.3.
- */
-struct mbedtls_ssl_key_set
-{
-    /*! The key for client->server records. */
-    unsigned char client_write_key[ MBEDTLS_SSL_MAX_KEY_LENGTH ];
-    /*! The key for server->client records. */
-    unsigned char server_write_key[ MBEDTLS_SSL_MAX_KEY_LENGTH ];
-    /*! The IV  for client->server records. */
-    unsigned char client_write_iv[ MBEDTLS_SSL_MAX_IV_LENGTH ];
-    /*! The IV  for server->client records. */
-    unsigned char server_write_iv[ MBEDTLS_SSL_MAX_IV_LENGTH ];
-
-    size_t key_len; /*!< The length of client_write_key and
-                     *   server_write_key, in Bytes. */
-    size_t iv_len;  /*!< The length of client_write_iv and
-                     *   server_write_iv, in Bytes. */
-};
-typedef struct mbedtls_ssl_key_set mbedtls_ssl_key_set;
-
-/*
- * This structure contains the parameters only needed during handshake.
- */
-struct mbedtls_ssl_handshake_params
-{
-    /*
-     * Handshake specific crypto variables
-     */
-
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
-    defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
-    mbedtls_ssl_sig_hash_set_t hash_algs;             /*!<  Set of suitable sig-hash pairs */
-#endif
-#if defined(MBEDTLS_DHM_C)
-    mbedtls_dhm_context dhm_ctx;                /*!<  DHM key exchange        */
-#endif
-/* Adding guard for MBEDTLS_ECDSA_C to ensure no compile errors due
- * to guards also being in ssl_srv.c and ssl_cli.c. There is a gap
- * in functionality that access to ecdh_ctx structure is needed for
- * MBEDTLS_ECDSA_C which does not seem correct.
- */
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
-    mbedtls_ecdh_context ecdh_ctx;              /*!<  ECDH key exchange       */
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-    psa_key_type_t ecdh_psa_type;
-    uint16_t ecdh_bits;
-    psa_key_id_t ecdh_psa_privkey;
-    unsigned char ecdh_psa_peerkey[MBEDTLS_PSA_MAX_EC_PUBKEY_LENGTH];
-    size_t ecdh_psa_peerkey_len;
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-    mbedtls_ecjpake_context ecjpake_ctx;        /*!< EC J-PAKE key exchange */
-#if defined(MBEDTLS_SSL_CLI_C)
-    unsigned char *ecjpake_cache;               /*!< Cache for ClientHello ext */
-    size_t ecjpake_cache_len;                   /*!< Length of cached data */
-#endif
-#endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
-#if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
-    defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
-    const mbedtls_ecp_curve_info **curves;      /*!<  Supported elliptic curves */
-#endif
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-    psa_key_id_t psk_opaque;            /*!< Opaque PSK from the callback   */
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-    unsigned char *psk;                 /*!<  PSK from the callback         */
-    size_t psk_len;                     /*!<  Length of PSK from callback   */
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
-#if defined(MBEDTLS_X509_CRT_PARSE_C)
-    mbedtls_ssl_key_cert *key_cert;     /*!< chosen key/cert pair (server)  */
-#if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
-    int sni_authmode;                   /*!< authmode from SNI callback     */
-    mbedtls_ssl_key_cert *sni_key_cert; /*!< key/cert list from SNI         */
-    mbedtls_x509_crt *sni_ca_chain;     /*!< trusted CAs from SNI callback  */
-    mbedtls_x509_crl *sni_ca_crl;       /*!< trusted CAs CRLs from SNI      */
-#endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
-#endif /* MBEDTLS_X509_CRT_PARSE_C */
-#if defined(MBEDTLS_SSL_ECP_RESTARTABLE_ENABLED)
-    int ecrs_enabled;                   /*!< Handshake supports EC restart? */
-    mbedtls_x509_crt_restart_ctx ecrs_ctx;  /*!< restart context            */
-    enum { /* this complements ssl->state with info on intra-state operations */
-        ssl_ecrs_none = 0,              /*!< nothing going on (yet)         */
-        ssl_ecrs_crt_verify,            /*!< Certificate: crt_verify()      */
-        ssl_ecrs_ske_start_processing,  /*!< ServerKeyExchange: pk_verify() */
-        ssl_ecrs_cke_ecdh_calc_secret,  /*!< ClientKeyExchange: ECDH step 2 */
-        ssl_ecrs_crt_vrfy_sign,         /*!< CertificateVerify: pk_sign()   */
-    } ecrs_state;                       /*!< current (or last) operation    */
-    mbedtls_x509_crt *ecrs_peer_cert;   /*!< The peer's CRT chain.          */
-    size_t ecrs_n;                      /*!< place for saving a length      */
-#endif
-#if defined(MBEDTLS_X509_CRT_PARSE_C) && \
-    !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
-    mbedtls_pk_context peer_pubkey;     /*!< The public key from the peer.  */
-#endif /* MBEDTLS_X509_CRT_PARSE_C && !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    unsigned int out_msg_seq;           /*!<  Outgoing handshake sequence number */
-    unsigned int in_msg_seq;            /*!<  Incoming handshake sequence number */
-
-    unsigned char *verify_cookie;       /*!<  Cli: HelloVerifyRequest cookie
-                                              Srv: unused                    */
-    unsigned char verify_cookie_len;    /*!<  Cli: cookie length
-                                              Srv: flag for sending a cookie */
-
-    uint32_t retransmit_timeout;        /*!<  Current value of timeout       */
-    unsigned char retransmit_state;     /*!<  Retransmission state           */
-    mbedtls_ssl_flight_item *flight;    /*!<  Current outgoing flight        */
-    mbedtls_ssl_flight_item *cur_msg;   /*!<  Current message in flight      */
-    unsigned char *cur_msg_p;           /*!<  Position in current message    */
-    unsigned int in_flight_start_seq;   /*!<  Minimum message sequence in the
-                                              flight being received          */
-    mbedtls_ssl_transform *alt_transform_out;   /*!<  Alternative transform for
-                                              resending messages             */
-    unsigned char alt_out_ctr[8];       /*!<  Alternative record epoch/counter
-                                              for resending messages         */
-
-#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-    /* The state of CID configuration in this handshake. */
-
-    uint8_t cid_in_use; /*!< This indicates whether the use of the CID extension
-                         *   has been negotiated. Possible values are
-                         *   #MBEDTLS_SSL_CID_ENABLED and
-                         *   #MBEDTLS_SSL_CID_DISABLED. */
-    unsigned char peer_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ]; /*! The peer's CID */
-    uint8_t peer_cid_len;                                  /*!< The length of
-                                                            *   \c peer_cid.  */
-#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
-
-    struct
-    {
-        size_t total_bytes_buffered; /*!< Cumulative size of heap allocated
-                                      *   buffers used for message buffering. */
-
-        uint8_t seen_ccs;               /*!< Indicates if a CCS message has
-                                         *   been seen in the current flight. */
-
-        struct mbedtls_ssl_hs_buffer
-        {
-            unsigned is_valid      : 1;
-            unsigned is_fragmented : 1;
-            unsigned is_complete   : 1;
-            unsigned char *data;
-            size_t data_len;
-        } hs[MBEDTLS_SSL_MAX_BUFFERED_HS];
-
-        struct
-        {
-            unsigned char *data;
-            size_t len;
-            unsigned epoch;
-        } future_record;
-
-    } buffering;
-
-    uint16_t mtu;                       /*!<  Handshake mtu, used to fragment outgoing messages */
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-
-    /*
-     * Checksum contexts
-     */
-#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
-    defined(MBEDTLS_SSL_PROTO_TLS1_1)
-       mbedtls_md5_context fin_md5;
-      mbedtls_sha1_context fin_sha1;
-#endif
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
-#if defined(MBEDTLS_SHA256_C)
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-    psa_hash_operation_t fin_sha256_psa;
-#else
-    mbedtls_sha256_context fin_sha256;
-#endif
-#endif
-#if defined(MBEDTLS_SHA512_C)
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-    psa_hash_operation_t fin_sha384_psa;
-#else
-    mbedtls_sha512_context fin_sha512;
-#endif
-#endif
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
-
-    void (*update_checksum)(mbedtls_ssl_context *, const unsigned char *, size_t);
-    void (*calc_verify)(const mbedtls_ssl_context *, unsigned char *, size_t *);
-    void (*calc_finished)(mbedtls_ssl_context *, unsigned char *, int);
-    mbedtls_ssl_tls_prf_cb *tls_prf;
-
-    mbedtls_ssl_ciphersuite_t const *ciphersuite_info;
-
-    size_t pmslen;                      /*!<  premaster length        */
-
-    unsigned char randbytes[64];        /*!<  random bytes            */
-    unsigned char premaster[MBEDTLS_PREMASTER_SIZE];
-                                        /*!<  premaster secret        */
-
-    int resume;                         /*!<  session resume indicator*/
-    int max_major_ver;                  /*!< max. major version client*/
-    int max_minor_ver;                  /*!< max. minor version client*/
-    int cli_exts;                       /*!< client extension presence*/
-
-#if defined(MBEDTLS_SSL_SESSION_TICKETS)
-    int new_session_ticket;             /*!< use NewSessionTicket?    */
-#endif /* MBEDTLS_SSL_SESSION_TICKETS */
-#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
-    int extended_ms;                    /*!< use Extended Master Secret? */
-#endif
-
-#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
-    unsigned int async_in_progress : 1; /*!< an asynchronous operation is in progress */
-#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
-
-#if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
-    /** Asynchronous operation context. This field is meant for use by the
-     * asynchronous operation callbacks (mbedtls_ssl_config::f_async_sign_start,
-     * mbedtls_ssl_config::f_async_decrypt_start,
-     * mbedtls_ssl_config::f_async_resume, mbedtls_ssl_config::f_async_cancel).
-     * The library does not use it internally. */
-    void *user_async_ctx;
-#endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
-};
-
-typedef struct mbedtls_ssl_hs_buffer mbedtls_ssl_hs_buffer;
-
-/*
- * Representation of decryption/encryption transformations on records
- *
- * There are the following general types of record transformations:
- * - Stream transformations (TLS versions <= 1.2 only)
- *   Transformation adding a MAC and applying a stream-cipher
- *   to the authenticated message.
- * - CBC block cipher transformations ([D]TLS versions <= 1.2 only)
- *   In addition to the distinction of the order of encryption and
- *   authentication, there's a fundamental difference between the
- *   handling in SSL3 & TLS 1.0 and TLS 1.1 and TLS 1.2: For SSL3
- *   and TLS 1.0, the final IV after processing a record is used
- *   as the IV for the next record. No explicit IV is contained
- *   in an encrypted record. The IV for the first record is extracted
- *   at key extraction time. In contrast, for TLS 1.1 and 1.2, no
- *   IV is generated at key extraction time, but every encrypted
- *   record is explicitly prefixed by the IV with which it was encrypted.
- * - AEAD transformations ([D]TLS versions >= 1.2 only)
- *   These come in two fundamentally different versions, the first one
- *   used in TLS 1.2, excluding ChaChaPoly ciphersuites, and the second
- *   one used for ChaChaPoly ciphersuites in TLS 1.2 as well as for TLS 1.3.
- *   In the first transformation, the IV to be used for a record is obtained
- *   as the concatenation of an explicit, static 4-byte IV and the 8-byte
- *   record sequence number, and explicitly prepending this sequence number
- *   to the encrypted record. In contrast, in the second transformation
- *   the IV is obtained by XOR'ing a static IV obtained at key extraction
- *   time with the 8-byte record sequence number, without prepending the
- *   latter to the encrypted record.
- *
- * Additionally, DTLS 1.2 + CID as well as TLS 1.3 use an inner plaintext
- * which allows to add flexible length padding and to hide a record's true
- * content type.
- *
- * In addition to type and version, the following parameters are relevant:
- * - The symmetric cipher algorithm to be used.
- * - The (static) encryption/decryption keys for the cipher.
- * - For stream/CBC, the type of message digest to be used.
- * - For stream/CBC, (static) encryption/decryption keys for the digest.
- * - For AEAD transformations, the size (potentially 0) of an explicit,
- *   random initialization vector placed in encrypted records.
- * - For some transformations (currently AEAD and CBC in SSL3 and TLS 1.0)
- *   an implicit IV. It may be static (e.g. AEAD) or dynamic (e.g. CBC)
- *   and (if present) is combined with the explicit IV in a transformation-
- *   dependent way (e.g. appending in TLS 1.2 and XOR'ing in TLS 1.3).
- * - For stream/CBC, a flag determining the order of encryption and MAC.
- * - The details of the transformation depend on the SSL/TLS version.
- * - The length of the authentication tag.
- *
- * Note: Except for CBC in SSL3 and TLS 1.0, these parameters are
- *       constant across multiple encryption/decryption operations.
- *       For CBC, the implicit IV needs to be updated after each
- *       operation.
- *
- * The struct below refines this abstract view as follows:
- * - The cipher underlying the transformation is managed in
- *   cipher contexts cipher_ctx_{enc/dec}, which must have the
- *   same cipher type. The mode of these cipher contexts determines
- *   the type of the transformation in the sense above: e.g., if
- *   the type is MBEDTLS_CIPHER_AES_256_CBC resp. MBEDTLS_CIPHER_AES_192_GCM
- *   then the transformation has type CBC resp. AEAD.
- * - The cipher keys are never stored explicitly but
- *   are maintained within cipher_ctx_{enc/dec}.
- * - For stream/CBC transformations, the message digest contexts
- *   used for the MAC's are stored in md_ctx_{enc/dec}. These contexts
- *   are unused for AEAD transformations.
- * - For stream/CBC transformations and versions > SSL3, the
- *   MAC keys are not stored explicitly but maintained within
- *   md_ctx_{enc/dec}.
- * - For stream/CBC transformations and version SSL3, the MAC
- *   keys are stored explicitly in mac_enc, mac_dec and have
- *   a fixed size of 20 bytes. These fields are unused for
- *   AEAD transformations or transformations >= TLS 1.0.
- * - For transformations using an implicit IV maintained within
- *   the transformation context, its contents are stored within
- *   iv_{enc/dec}.
- * - The value of ivlen indicates the length of the IV.
- *   This is redundant in case of stream/CBC transformations
- *   which always use 0 resp. the cipher's block length as the
- *   IV length, but is needed for AEAD ciphers and may be
- *   different from the underlying cipher's block length
- *   in this case.
- * - The field fixed_ivlen is nonzero for AEAD transformations only
- *   and indicates the length of the static part of the IV which is
- *   constant throughout the communication, and which is stored in
- *   the first fixed_ivlen bytes of the iv_{enc/dec} arrays.
- *   Note: For CBC in SSL3 and TLS 1.0, the fields iv_{enc/dec}
- *   still store IV's for continued use across multiple transformations,
- *   so it is not true that fixed_ivlen == 0 means that iv_{enc/dec} are
- *   not being used!
- * - minor_ver denotes the SSL/TLS version
- * - For stream/CBC transformations, maclen denotes the length of the
- *   authentication tag, while taglen is unused and 0.
- * - For AEAD transformations, taglen denotes the length of the
- *   authentication tag, while maclen is unused and 0.
- * - For CBC transformations, encrypt_then_mac determines the
- *   order of encryption and authentication. This field is unused
- *   in other transformations.
- *
- */
-struct mbedtls_ssl_transform
-{
-    /*
-     * Session specific crypto layer
-     */
-    size_t minlen;                      /*!<  min. ciphertext length  */
-    size_t ivlen;                       /*!<  IV length               */
-    size_t fixed_ivlen;                 /*!<  Fixed part of IV (AEAD) */
-    size_t maclen;                      /*!<  MAC(CBC) len            */
-    size_t taglen;                      /*!<  TAG(AEAD) len           */
-
-    unsigned char iv_enc[16];           /*!<  IV (encryption)         */
-    unsigned char iv_dec[16];           /*!<  IV (decryption)         */
-
-#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
-
-#if defined(MBEDTLS_SSL_PROTO_SSL3)
-    /* Needed only for SSL v3.0 secret */
-    unsigned char mac_enc[20];          /*!<  SSL v3.0 secret (enc)   */
-    unsigned char mac_dec[20];          /*!<  SSL v3.0 secret (dec)   */
-#endif /* MBEDTLS_SSL_PROTO_SSL3 */
-
-    mbedtls_md_context_t md_ctx_enc;            /*!<  MAC (encryption)        */
-    mbedtls_md_context_t md_ctx_dec;            /*!<  MAC (decryption)        */
-
-#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
-    int encrypt_then_mac;       /*!< flag for EtM activation                */
-#endif
-
-#endif /* MBEDTLS_SSL_SOME_MODES_USE_MAC */
-
-    mbedtls_cipher_context_t cipher_ctx_enc;    /*!<  encryption context      */
-    mbedtls_cipher_context_t cipher_ctx_dec;    /*!<  decryption context      */
-    int minor_ver;
-
-#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-    uint8_t in_cid_len;
-    uint8_t out_cid_len;
-    unsigned char in_cid [ MBEDTLS_SSL_CID_OUT_LEN_MAX ];
-    unsigned char out_cid[ MBEDTLS_SSL_CID_OUT_LEN_MAX ];
-#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
-
-    /*
-     * Session specific compression layer
-     */
-#if defined(MBEDTLS_ZLIB_SUPPORT)
-    z_stream ctx_deflate;               /*!<  compression context     */
-    z_stream ctx_inflate;               /*!<  decompression context   */
-#endif
-
-#if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION)
-    /* We need the Hello random bytes in order to re-derive keys from the
-     * Master Secret and other session info, see ssl_populate_transform() */
-    unsigned char randbytes[64]; /*!< ServerHello.random+ClientHello.random */
-#endif /* MBEDTLS_SSL_CONTEXT_SERIALIZATION */
-};
-
-/*
- * Return 1 if the transform uses an AEAD cipher, 0 otherwise.
- * Equivalently, return 0 if a separate MAC is used, 1 otherwise.
- */
-static inline int mbedtls_ssl_transform_uses_aead(
-        const mbedtls_ssl_transform *transform )
-{
-#if defined(MBEDTLS_SSL_SOME_MODES_USE_MAC)
-    return( transform->maclen == 0 && transform->taglen != 0 );
-#else
-    (void) transform;
-    return( 1 );
-#endif
-}
-
-/*
- * Internal representation of record frames
- *
- * Instances come in two flavors:
- * (1) Encrypted
- *     These always have data_offset = 0
- * (2) Unencrypted
- *     These have data_offset set to the amount of
- *     pre-expansion during record protection. Concretely,
- *     this is the length of the fixed part of the explicit IV
- *     used for encryption, or 0 if no explicit IV is used
- *     (e.g. for CBC in TLS 1.0, or stream ciphers).
- *
- * The reason for the data_offset in the unencrypted case
- * is to allow for in-place conversion of an unencrypted to
- * an encrypted record. If the offset wasn't included, the
- * encrypted content would need to be shifted afterwards to
- * make space for the fixed IV.
- *
- */
-#if MBEDTLS_SSL_CID_OUT_LEN_MAX > MBEDTLS_SSL_CID_IN_LEN_MAX
-#define MBEDTLS_SSL_CID_LEN_MAX MBEDTLS_SSL_CID_OUT_LEN_MAX
-#else
-#define MBEDTLS_SSL_CID_LEN_MAX MBEDTLS_SSL_CID_IN_LEN_MAX
-#endif
-
-typedef struct
-{
-    uint8_t ctr[8];         /* In TLS:  The implicit record sequence number.
-                             * In DTLS: The 2-byte epoch followed by
-                             *          the 6-byte sequence number.
-                             * This is stored as a raw big endian byte array
-                             * as opposed to a uint64_t because we rarely
-                             * need to perform arithmetic on this, but do
-                             * need it as a Byte array for the purpose of
-                             * MAC computations.                             */
-    uint8_t type;           /* The record content type.                      */
-    uint8_t ver[2];         /* SSL/TLS version as present on the wire.
-                             * Convert to internal presentation of versions
-                             * using mbedtls_ssl_read_version() and
-                             * mbedtls_ssl_write_version().
-                             * Keep wire-format for MAC computations.        */
-
-    unsigned char *buf;     /* Memory buffer enclosing the record content    */
-    size_t buf_len;         /* Buffer length                                 */
-    size_t data_offset;     /* Offset of record content                      */
-    size_t data_len;        /* Length of record content                      */
-
-#if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
-    uint8_t cid_len;        /* Length of the CID (0 if not present)          */
-    unsigned char cid[ MBEDTLS_SSL_CID_LEN_MAX ]; /* The CID                 */
-#endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
-} mbedtls_record;
-
-#if defined(MBEDTLS_X509_CRT_PARSE_C)
-/*
- * List of certificate + private key pairs
- */
-struct mbedtls_ssl_key_cert
-{
-    mbedtls_x509_crt *cert;                 /*!< cert                       */
-    mbedtls_pk_context *key;                /*!< private key                */
-    mbedtls_ssl_key_cert *next;             /*!< next key/cert pair         */
-};
-#endif /* MBEDTLS_X509_CRT_PARSE_C */
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-/*
- * List of handshake messages kept around for resending
- */
-struct mbedtls_ssl_flight_item
-{
-    unsigned char *p;       /*!< message, including handshake headers   */
-    size_t len;             /*!< length of p                            */
-    unsigned char type;     /*!< type of the message: handshake or CCS  */
-    mbedtls_ssl_flight_item *next;  /*!< next handshake message(s)              */
-};
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-
-#if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
-    defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
-
-/* Find an entry in a signature-hash set matching a given hash algorithm. */
-mbedtls_md_type_t mbedtls_ssl_sig_hash_set_find( mbedtls_ssl_sig_hash_set_t *set,
-                                                 mbedtls_pk_type_t sig_alg );
-/* Add a signature-hash-pair to a signature-hash set */
-void mbedtls_ssl_sig_hash_set_add( mbedtls_ssl_sig_hash_set_t *set,
-                                   mbedtls_pk_type_t sig_alg,
-                                   mbedtls_md_type_t md_alg );
-/* Allow exactly one hash algorithm for each signature. */
-void mbedtls_ssl_sig_hash_set_const_hash( mbedtls_ssl_sig_hash_set_t *set,
-                                          mbedtls_md_type_t md_alg );
-
-/* Setup an empty signature-hash set */
-static inline void mbedtls_ssl_sig_hash_set_init( mbedtls_ssl_sig_hash_set_t *set )
-{
-    mbedtls_ssl_sig_hash_set_const_hash( set, MBEDTLS_MD_NONE );
-}
-
-#endif /* MBEDTLS_SSL_PROTO_TLS1_2) &&
-          MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED */
-
-/**
- * \brief           Free referenced items in an SSL transform context and clear
- *                  memory
- *
- * \param transform SSL transform context
- */
-void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform );
-
-/**
- * \brief           Free referenced items in an SSL handshake context and clear
- *                  memory
- *
- * \param ssl       SSL context
- */
-void mbedtls_ssl_handshake_free( mbedtls_ssl_context *ssl );
-
-int mbedtls_ssl_handshake_client_step( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl );
-void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl );
-
-int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl );
-
-void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl );
-
-int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl );
-void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl );
-
-/**
- * \brief       Update record layer
- *
- *              This function roughly separates the implementation
- *              of the logic of (D)TLS from the implementation
- *              of the secure transport.
- *
- * \param  ssl              The SSL context to use.
- * \param  update_hs_digest This indicates if the handshake digest
- *                          should be automatically updated in case
- *                          a handshake message is found.
- *
- * \return      0 or non-zero error code.
- *
- * \note        A clarification on what is called 'record layer' here
- *              is in order, as many sensible definitions are possible:
- *
- *              The record layer takes as input an untrusted underlying
- *              transport (stream or datagram) and transforms it into
- *              a serially multiplexed, secure transport, which
- *              conceptually provides the following:
- *
- *              (1) Three datagram based, content-agnostic transports
- *                  for handshake, alert and CCS messages.
- *              (2) One stream- or datagram-based transport
- *                  for application data.
- *              (3) Functionality for changing the underlying transform
- *                  securing the contents.
- *
- *              The interface to this functionality is given as follows:
- *
- *              a Updating
- *                [Currently implemented by mbedtls_ssl_read_record]
- *
- *                Check if and on which of the four 'ports' data is pending:
- *                Nothing, a controlling datagram of type (1), or application
- *                data (2). In any case data is present, internal buffers
- *                provide access to the data for the user to process it.
- *                Consumption of type (1) datagrams is done automatically
- *                on the next update, invalidating that the internal buffers
- *                for previous datagrams, while consumption of application
- *                data (2) is user-controlled.
- *
- *              b Reading of application data
- *                [Currently manual adaption of ssl->in_offt pointer]
- *
- *                As mentioned in the last paragraph, consumption of data
- *                is different from the automatic consumption of control
- *                datagrams (1) because application data is treated as a stream.
- *
- *              c Tracking availability of application data
- *                [Currently manually through decreasing ssl->in_msglen]
- *
- *                For efficiency and to retain datagram semantics for
- *                application data in case of DTLS, the record layer
- *                provides functionality for checking how much application
- *                data is still available in the internal buffer.
- *
- *              d Changing the transformation securing the communication.
- *
- *              Given an opaque implementation of the record layer in the
- *              above sense, it should be possible to implement the logic
- *              of (D)TLS on top of it without the need to know anything
- *              about the record layer's internals. This is done e.g.
- *              in all the handshake handling functions, and in the
- *              application data reading function mbedtls_ssl_read.
- *
- * \note        The above tries to give a conceptual picture of the
- *              record layer, but the current implementation deviates
- *              from it in some places. For example, our implementation of
- *              the update functionality through mbedtls_ssl_read_record
- *              discards datagrams depending on the current state, which
- *              wouldn't fall under the record layer's responsibility
- *              following the above definition.
- *
- */
-int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl,
-                             unsigned update_hs_digest );
-int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want );
-
-int mbedtls_ssl_write_handshake_msg( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl, uint8_t force_flush );
-int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl );
-
-int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl );
-
-int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl );
-
-int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl );
-
-void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
-                            const mbedtls_ssl_ciphersuite_t *ciphersuite_info );
-
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED)
-int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex );
-
-/**
- * Get the first defined PSK by order of precedence:
- * 1. handshake PSK set by \c mbedtls_ssl_set_hs_psk() in the PSK callback
- * 2. static PSK configured by \c mbedtls_ssl_conf_psk()
- * Return a code and update the pair (PSK, PSK length) passed to this function
- */
-static inline int mbedtls_ssl_get_psk( const mbedtls_ssl_context *ssl,
-    const unsigned char **psk, size_t *psk_len )
-{
-    if( ssl->handshake->psk != NULL && ssl->handshake->psk_len > 0 )
-    {
-        *psk = ssl->handshake->psk;
-        *psk_len = ssl->handshake->psk_len;
-    }
-
-    else if( ssl->conf->psk != NULL && ssl->conf->psk_len > 0 )
-    {
-        *psk = ssl->conf->psk;
-        *psk_len = ssl->conf->psk_len;
-    }
-
-    else
-    {
-        *psk = NULL;
-        *psk_len = 0;
-        return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
-    }
-
-    return( 0 );
-}
-
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-/**
- * Get the first defined opaque PSK by order of precedence:
- * 1. handshake PSK set by \c mbedtls_ssl_set_hs_psk_opaque() in the PSK
- *    callback
- * 2. static PSK configured by \c mbedtls_ssl_conf_psk_opaque()
- * Return an opaque PSK
- */
-static inline psa_key_id_t mbedtls_ssl_get_opaque_psk(
-    const mbedtls_ssl_context *ssl )
-{
-    if( ! mbedtls_svc_key_id_is_null( ssl->handshake->psk_opaque ) )
-        return( ssl->handshake->psk_opaque );
-
-    if( ! mbedtls_svc_key_id_is_null( ssl->conf->psk_opaque ) )
-        return( ssl->conf->psk_opaque );
-
-    return( MBEDTLS_SVC_KEY_ID_INIT );
-}
-#endif /* MBEDTLS_USE_PSA_CRYPTO */
-
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PSK_ENABLED */
-
-#if defined(MBEDTLS_PK_C)
-unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk );
-unsigned char mbedtls_ssl_sig_from_pk_alg( mbedtls_pk_type_t type );
-mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig );
-#endif
-
-mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash );
-unsigned char mbedtls_ssl_hash_from_md_alg( int md );
-int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md );
-
-#if defined(MBEDTLS_ECP_C)
-int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id );
-#endif
-
-#if defined(MBEDTLS_KEY_EXCHANGE_WITH_CERT_ENABLED)
-int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl,
-                                mbedtls_md_type_t md );
-#endif
-
-#if defined(MBEDTLS_SSL_DTLS_SRTP)
-static inline mbedtls_ssl_srtp_profile mbedtls_ssl_check_srtp_profile_value
-                                                    ( const uint16_t srtp_profile_value )
-{
-    switch( srtp_profile_value )
-    {
-        case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_80:
-        case MBEDTLS_TLS_SRTP_AES128_CM_HMAC_SHA1_32:
-        case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_80:
-        case MBEDTLS_TLS_SRTP_NULL_HMAC_SHA1_32:
-            return srtp_profile_value;
-        default: break;
-    }
-    return( MBEDTLS_TLS_SRTP_UNSET );
-}
-#endif
-
-#if defined(MBEDTLS_X509_CRT_PARSE_C)
-static inline mbedtls_pk_context *mbedtls_ssl_own_key( mbedtls_ssl_context *ssl )
-{
-    mbedtls_ssl_key_cert *key_cert;
-
-    if( ssl->handshake != NULL && ssl->handshake->key_cert != NULL )
-        key_cert = ssl->handshake->key_cert;
-    else
-        key_cert = ssl->conf->key_cert;
-
-    return( key_cert == NULL ? NULL : key_cert->key );
-}
-
-static inline mbedtls_x509_crt *mbedtls_ssl_own_cert( mbedtls_ssl_context *ssl )
-{
-    mbedtls_ssl_key_cert *key_cert;
-
-    if( ssl->handshake != NULL && ssl->handshake->key_cert != NULL )
-        key_cert = ssl->handshake->key_cert;
-    else
-        key_cert = ssl->conf->key_cert;
-
-    return( key_cert == NULL ? NULL : key_cert->cert );
-}
-
-/*
- * Check usage of a certificate wrt extensions:
- * keyUsage, extendedKeyUsage (later), and nSCertType (later).
- *
- * Warning: cert_endpoint is the endpoint of the cert (ie, of our peer when we
- * check a cert we received from them)!
- *
- * Return 0 if everything is OK, -1 if not.
- */
-int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
-                          const mbedtls_ssl_ciphersuite_t *ciphersuite,
-                          int cert_endpoint,
-                          uint32_t *flags );
-#endif /* MBEDTLS_X509_CRT_PARSE_C */
-
-void mbedtls_ssl_write_version( int major, int minor, int transport,
-                        unsigned char ver[2] );
-void mbedtls_ssl_read_version( int *major, int *minor, int transport,
-                       const unsigned char ver[2] );
-
-static inline size_t mbedtls_ssl_in_hdr_len( const mbedtls_ssl_context *ssl )
-{
-#if !defined(MBEDTLS_SSL_PROTO_DTLS)
-    ((void) ssl);
-#endif
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-    {
-        return( 13 );
-    }
-    else
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-    {
-        return( 5 );
-    }
-}
-
-static inline size_t mbedtls_ssl_out_hdr_len( const mbedtls_ssl_context *ssl )
-{
-    return( (size_t) ( ssl->out_iv - ssl->out_hdr ) );
-}
-
-static inline size_t mbedtls_ssl_hs_hdr_len( const mbedtls_ssl_context *ssl )
-{
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-        return( 12 );
-#else
-    ((void) ssl);
-#endif
-    return( 4 );
-}
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl );
-void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_resend( mbedtls_ssl_context *ssl );
-int mbedtls_ssl_flight_transmit( mbedtls_ssl_context *ssl );
-#endif
-
-/* Visible for testing purposes only */
-#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
-int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context const *ssl );
-void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl );
-#endif
-
-int mbedtls_ssl_session_copy( mbedtls_ssl_session *dst,
-                              const mbedtls_ssl_session *src );
-
-/* constant-time buffer comparison */
-static inline int mbedtls_ssl_safer_memcmp( const void *a, const void *b, size_t n )
-{
-    size_t i;
-    volatile const unsigned char *A = (volatile const unsigned char *) a;
-    volatile const unsigned char *B = (volatile const unsigned char *) b;
-    volatile unsigned char diff = 0;
-
-    for( i = 0; i < n; i++ )
-    {
-        /* Read volatile data in order before computing diff.
-         * This avoids IAR compiler warning:
-         * 'the order of volatile accesses is undefined ..' */
-        unsigned char x = A[i], y = B[i];
-        diff |= x ^ y;
-    }
-
-    return( diff );
-}
-
-#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
-    defined(MBEDTLS_SSL_PROTO_TLS1_1)
-int mbedtls_ssl_get_key_exchange_md_ssl_tls( mbedtls_ssl_context *ssl,
-                                        unsigned char *output,
-                                        unsigned char *data, size_t data_len );
-#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)
-/* The hash buffer must have at least MBEDTLS_MD_MAX_SIZE bytes of length. */
-int mbedtls_ssl_get_key_exchange_md_tls1_2( mbedtls_ssl_context *ssl,
-                                            unsigned char *hash, size_t *hashlen,
-                                            unsigned char *data, size_t data_len,
-                                            mbedtls_md_type_t md_alg );
-#endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
-          MBEDTLS_SSL_PROTO_TLS1_2 */
-
-#ifdef __cplusplus
-}
-#endif
-
-void mbedtls_ssl_transform_init( mbedtls_ssl_transform *transform );
-int mbedtls_ssl_encrypt_buf( mbedtls_ssl_context *ssl,
-                             mbedtls_ssl_transform *transform,
-                             mbedtls_record *rec,
-                             int (*f_rng)(void *, unsigned char *, size_t),
-                             void *p_rng );
-int mbedtls_ssl_decrypt_buf( mbedtls_ssl_context const *ssl,
-                             mbedtls_ssl_transform *transform,
-                             mbedtls_record *rec );
-
-/* Length of the "epoch" field in the record header */
-static inline size_t mbedtls_ssl_ep_len( const mbedtls_ssl_context *ssl )
-{
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-    if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
-        return( 2 );
-#else
-    ((void) ssl);
-#endif
-    return( 0 );
-}
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-int mbedtls_ssl_resend_hello_request( mbedtls_ssl_context *ssl );
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-
-void mbedtls_ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs );
-int mbedtls_ssl_check_timer( mbedtls_ssl_context *ssl );
-
-void mbedtls_ssl_reset_in_out_pointers( mbedtls_ssl_context *ssl );
-void mbedtls_ssl_update_out_pointers( mbedtls_ssl_context *ssl,
-                              mbedtls_ssl_transform *transform );
-void mbedtls_ssl_update_in_pointers( mbedtls_ssl_context *ssl );
-
-int mbedtls_ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial );
-
-#if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
-void mbedtls_ssl_dtls_replay_reset( mbedtls_ssl_context *ssl );
-#endif
-
-void mbedtls_ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl );
-
-#if defined(MBEDTLS_SSL_RENEGOTIATION)
-int mbedtls_ssl_start_renegotiation( mbedtls_ssl_context *ssl );
-#endif /* MBEDTLS_SSL_RENEGOTIATION */
-
-#if defined(MBEDTLS_SSL_PROTO_DTLS)
-size_t mbedtls_ssl_get_current_mtu( const mbedtls_ssl_context *ssl );
-void mbedtls_ssl_buffering_free( mbedtls_ssl_context *ssl );
-void mbedtls_ssl_flight_free( mbedtls_ssl_flight_item *flight );
-#endif /* MBEDTLS_SSL_PROTO_DTLS */
-
-#endif /* ssl_internal.h */