programs/ssl/ssl_test_common_source.c - third_party/github/ARMmbed/mbedtls - Git at Google

 /*
  *  Common source code for SSL test programs. This file is included by
  *  both ssl_client2.c and ssl_server2.c and is intended for source
  *  code that is textually identical in both programs, but that cannot be
  *  compiled separately because it refers to types or macros that are
  *  different in the two programs, or because it would have an incomplete
  *  type.
  *
  *  This file is meant to be #include'd and cannot be compiled separately.
  *
  *  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.
  */

 void eap_tls_key_derivation( void *p_expkey,
                              mbedtls_ssl_key_export_type secret_type,
                              const unsigned char *secret,
                              size_t secret_len,
                              const unsigned char client_random[32],
                              const unsigned char server_random[32],
                              mbedtls_tls_prf_types tls_prf_type )
 {
     eap_tls_keys *keys = (eap_tls_keys *)p_expkey;

     /* We're only interested in the TLS 1.2 master secret */
     if( secret_type != MBEDTLS_SSL_KEY_EXPORT_TLS12_MASTER_SECRET )
         return;
     if( secret_len != sizeof( keys->master_secret ) )
         return;

     memcpy( keys->master_secret, secret, sizeof( keys->master_secret ) );
     memcpy( keys->randbytes, client_random, 32 );
     memcpy( keys->randbytes + 32, server_random, 32 );
     keys->tls_prf_type = tls_prf_type;
 }

 void nss_keylog_export( void *p_expkey,
                         mbedtls_ssl_key_export_type secret_type,
                         const unsigned char *secret,
                         size_t secret_len,
                         const unsigned char client_random[32],
                         const unsigned char server_random[32],
                         mbedtls_tls_prf_types tls_prf_type )
 {
     char nss_keylog_line[ 200 ];
     size_t const client_random_len = 32;
     size_t len = 0;
     size_t j;

     /* We're only interested in the TLS 1.2 master secret */
     if( secret_type != MBEDTLS_SSL_KEY_EXPORT_TLS12_MASTER_SECRET )
         return;

     ((void) p_expkey);
     ((void) server_random);
     ((void) tls_prf_type);

     len += sprintf( nss_keylog_line + len,
                     "%s", "CLIENT_RANDOM " );

     for( j = 0; j < client_random_len; j++ )
     {
         len += sprintf( nss_keylog_line + len,
                         "%02x", client_random[j] );
     }

     len += sprintf( nss_keylog_line + len, " " );

     for( j = 0; j < secret_len; j++ )
     {
         len += sprintf( nss_keylog_line + len,
                         "%02x", secret[j] );
     }

     len += sprintf( nss_keylog_line + len, "\n" );
     nss_keylog_line[ len ] = '\0';

     mbedtls_printf( "\n" );
     mbedtls_printf( "---------------- NSS KEYLOG -----------------\n" );
     mbedtls_printf( "%s", nss_keylog_line );
     mbedtls_printf( "---------------------------------------------\n" );

     if( opt.nss_keylog_file != NULL )
     {
         FILE *f;

         if( ( f = fopen( opt.nss_keylog_file, "a" ) ) == NULL )
         {
             goto exit;
         }

         if( fwrite( nss_keylog_line, 1, len, f ) != len )
         {
             fclose( f );
             goto exit;
         }

         fclose( f );
     }

 exit:
     mbedtls_platform_zeroize( nss_keylog_line,
                               sizeof( nss_keylog_line ) );
 }

 #if defined( MBEDTLS_SSL_DTLS_SRTP )
 void dtls_srtp_key_derivation( void *p_expkey,
                                mbedtls_ssl_key_export_type secret_type,
                                const unsigned char *secret,
                                size_t secret_len,
                                const unsigned char client_random[32],
                                const unsigned char server_random[32],
                                mbedtls_tls_prf_types tls_prf_type )
 {
     dtls_srtp_keys *keys = (dtls_srtp_keys *)p_expkey;

     /* We're only interested in the TLS 1.2 master secret */
     if( secret_type != MBEDTLS_SSL_KEY_EXPORT_TLS12_MASTER_SECRET )
         return;
     if( secret_len != sizeof( keys->master_secret ) )
         return;

     memcpy( keys->master_secret, secret, sizeof( keys->master_secret ) );
     memcpy( keys->randbytes, client_random, 32 );
     memcpy( keys->randbytes + 32, server_random, 32 );
     keys->tls_prf_type = tls_prf_type;
 }
 #endif /* MBEDTLS_SSL_DTLS_SRTP */

 int ssl_check_record( mbedtls_ssl_context const *ssl,
                       unsigned char const *buf, size_t len )
 {
     int my_ret = 0, ret_cr1, ret_cr2;
     unsigned char *tmp_buf;

     /* Record checking may modify the input buffer,
      * so make a copy. */
     tmp_buf = mbedtls_calloc( 1, len );
     if( tmp_buf == NULL )
         return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
     memcpy( tmp_buf, buf, len );

     ret_cr1 = mbedtls_ssl_check_record( ssl, tmp_buf, len );
     if( ret_cr1 != MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE )
     {
         /* Test-only: Make sure that mbedtls_ssl_check_record()
          *            doesn't alter state. */
         memcpy( tmp_buf, buf, len ); /* Restore buffer */
         ret_cr2 = mbedtls_ssl_check_record( ssl, tmp_buf, len );
         if( ret_cr2 != ret_cr1 )
         {
             mbedtls_printf( "mbedtls_ssl_check_record() returned inconsistent results.\n" );
             my_ret = -1;
             goto cleanup;
         }

         switch( ret_cr1 )
         {
             case 0:
                 break;

             case MBEDTLS_ERR_SSL_INVALID_RECORD:
                 if( opt.debug_level > 1 )
                     mbedtls_printf( "mbedtls_ssl_check_record() detected invalid record.\n" );
                 break;

             case MBEDTLS_ERR_SSL_INVALID_MAC:
                 if( opt.debug_level > 1 )
                     mbedtls_printf( "mbedtls_ssl_check_record() detected unauthentic record.\n" );
                 break;

             case MBEDTLS_ERR_SSL_UNEXPECTED_RECORD:
                 if( opt.debug_level > 1 )
                     mbedtls_printf( "mbedtls_ssl_check_record() detected unexpected record.\n" );
                 break;

             default:
                 mbedtls_printf( "mbedtls_ssl_check_record() failed fatally with -%#04x.\n", (unsigned int) -ret_cr1 );
                 my_ret = -1;
                 goto cleanup;
         }

         /* Regardless of the outcome, forward the record to the stack. */
     }

 cleanup:
     mbedtls_free( tmp_buf );

     return( my_ret );
 }

 int recv_cb( void *ctx, unsigned char *buf, size_t len )
 {
     io_ctx_t *io_ctx = (io_ctx_t*) ctx;
     size_t recv_len;
     int ret;

     if( opt.nbio == 2 )
         ret = delayed_recv( io_ctx->net, buf, len );
     else
         ret = mbedtls_net_recv( io_ctx->net, buf, len );
     if( ret < 0 )
         return( ret );
     recv_len = (size_t) ret;

     if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
     {
         /* Here's the place to do any datagram/record checking
          * in between receiving the packet from the underlying
          * transport and passing it on to the TLS stack. */
         if( ssl_check_record( io_ctx->ssl, buf, recv_len ) != 0 )
             return( -1 );
     }

     return( (int) recv_len );
 }

 int recv_timeout_cb( void *ctx, unsigned char *buf, size_t len,
                      uint32_t timeout )
 {
     io_ctx_t *io_ctx = (io_ctx_t*) ctx;
     int ret;
     size_t recv_len;

     ret = mbedtls_net_recv_timeout( io_ctx->net, buf, len, timeout );
     if( ret < 0 )
         return( ret );
     recv_len = (size_t) ret;

     if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
     {
         /* Here's the place to do any datagram/record checking
          * in between receiving the packet from the underlying
          * transport and passing it on to the TLS stack. */
         if( ssl_check_record( io_ctx->ssl, buf, recv_len ) != 0 )
             return( -1 );
     }

     return( (int) recv_len );
 }

 int send_cb( void *ctx, unsigned char const *buf, size_t len )
 {
     io_ctx_t *io_ctx = (io_ctx_t*) ctx;

     if( opt.nbio == 2 )
         return( delayed_send( io_ctx->net, buf, len ) );

     return( mbedtls_net_send( io_ctx->net, buf, len ) );
 }

 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_RSA_C)
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
 /*
  *   When GnuTLS/Openssl server is configured in TLS 1.2 mode with a certificate
  *   declaring an RSA public key and Mbed TLS is configured in hybrid mode, if
  *   `rsa_pss_rsae_*` algorithms are before `rsa_pkcs1_*` ones in this list then
  *   the GnuTLS/Openssl server chooses an `rsa_pss_rsae_*` signature algorithm
  *   for its signature in the key exchange message. As Mbed TLS 1.2 does not
  *   support them, the handshake fails.
  */
 #define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) | MBEDTLS_SSL_SIG_ECDSA), \
                                     (( hash << 8 ) | MBEDTLS_SSL_SIG_RSA), \
                                     ( 0x800 | hash ),
 #else
 #define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) | MBEDTLS_SSL_SIG_ECDSA), \
                                     (( hash << 8 ) | MBEDTLS_SSL_SIG_RSA),
 #endif
 #elif defined(MBEDTLS_ECDSA_C)
 #define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) | MBEDTLS_SSL_SIG_ECDSA),
 #elif defined(MBEDTLS_RSA_C)
 #if defined(MBEDTLS_SSL_PROTO_TLS1_3)
 /* See above */
 #define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) | MBEDTLS_SSL_SIG_RSA), \
                                     ( 0x800 | hash ),
 #else
 #define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) | MBEDTLS_SSL_SIG_RSA),
 #endif
 #else
 #define MBEDTLS_SSL_SIG_ALG( hash )
 #endif
 uint16_t ssl_sig_algs_for_test[] = {
 #if defined(MBEDTLS_SHA512_C)
     MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA512 )
 #endif
 #if defined(MBEDTLS_SHA384_C)
     MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA384 )
 #endif
 #if defined(MBEDTLS_SHA256_C)
     MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA256 )
 #endif
 #if defined(MBEDTLS_SHA224_C)
     MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA224 )
 #endif
 #if defined(MBEDTLS_SHA1_C)
     /* Allow SHA-1 as we use it extensively in tests. */
     MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA1 )
 #endif
     MBEDTLS_TLS1_3_SIG_NONE
 };
 #endif /* MBEDTLS_X509_CRT_PARSE_C */

 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 /** Functionally equivalent to mbedtls_x509_crt_verify_info, see that function
  *  for more info.
  */
 int x509_crt_verify_info( char *buf, size_t size, const char *prefix,
                           uint32_t flags )
 {
 #if !defined(MBEDTLS_X509_REMOVE_INFO)
     return( mbedtls_x509_crt_verify_info( buf, size, prefix, flags ) );

 #else /* !MBEDTLS_X509_REMOVE_INFO */
     int ret;
     char *p = buf;
     size_t n = size;

 #define X509_CRT_ERROR_INFO( err, err_str, info )                      \
     if( ( flags & err ) != 0 )                                         \
     {                                                                  \
         ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, info );        \
         MBEDTLS_X509_SAFE_SNPRINTF;                                    \
         flags ^= err;                                                  \
     }

     MBEDTLS_X509_CRT_ERROR_INFO_LIST
 #undef X509_CRT_ERROR_INFO

     if( flags != 0 )
     {
         ret = mbedtls_snprintf( p, n, "%sUnknown reason "
                                        "(this should not happen)\n", prefix );
         MBEDTLS_X509_SAFE_SNPRINTF;
     }

     return( (int) ( size - n ) );
 #endif /* MBEDTLS_X509_REMOVE_INFO */
 }
 #endif /* MBEDTLS_X509_CRT_PARSE_C */

 void mbedtls_print_supported_sig_algs( void )
 {
     mbedtls_printf( "supported signature algorithms:\n" );
     mbedtls_printf("\trsa_pkcs1_sha256 ");
     mbedtls_printf("rsa_pkcs1_sha384 ");
     mbedtls_printf("rsa_pkcs1_sha512\n");
     mbedtls_printf("\tecdsa_secp256r1_sha256 ");
     mbedtls_printf("ecdsa_secp384r1_sha384 ");
     mbedtls_printf("ecdsa_secp521r1_sha512\n");
     mbedtls_printf("\trsa_pss_rsae_sha256 ");
     mbedtls_printf("rsa_pss_rsae_sha384 ");
     mbedtls_printf("rsa_pss_rsae_sha512\n");
     mbedtls_printf("\trsa_pss_pss_sha256 ");
     mbedtls_printf("rsa_pss_pss_sha384 ");
     mbedtls_printf("rsa_pss_pss_sha512\n");
     mbedtls_printf("\ted25519 ");
     mbedtls_printf("ed448 ");
     mbedtls_printf("rsa_pkcs1_sha1 ");
     mbedtls_printf("ecdsa_sha1\n");
     mbedtls_printf( "\n" );
 }
	/*
	* Common source code for SSL test programs. This file is included by
	* both ssl_client2.c and ssl_server2.c and is intended for source
	* code that is textually identical in both programs, but that cannot be
	* compiled separately because it refers to types or macros that are
	* different in the two programs, or because it would have an incomplete
	* type.
	*
	* This file is meant to be #include'd and cannot be compiled separately.
	*
	* 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.
	*/

	void eap_tls_key_derivation( void *p_expkey,
	mbedtls_ssl_key_export_type secret_type,
	const unsigned char *secret,
	size_t secret_len,
	const unsigned char client_random[32],
	const unsigned char server_random[32],
	mbedtls_tls_prf_types tls_prf_type )
	{
	eap_tls_keys keys = (eap_tls_keys )p_expkey;

	/* We're only interested in the TLS 1.2 master secret */
	if( secret_type != MBEDTLS_SSL_KEY_EXPORT_TLS12_MASTER_SECRET )
	return;
	if( secret_len != sizeof( keys->master_secret ) )
	return;

	memcpy( keys->master_secret, secret, sizeof( keys->master_secret ) );
	memcpy( keys->randbytes, client_random, 32 );
	memcpy( keys->randbytes + 32, server_random, 32 );
	keys->tls_prf_type = tls_prf_type;
	}

	void nss_keylog_export( void *p_expkey,
	mbedtls_ssl_key_export_type secret_type,
	const unsigned char *secret,
	size_t secret_len,
	const unsigned char client_random[32],
	const unsigned char server_random[32],
	mbedtls_tls_prf_types tls_prf_type )
	{
	char nss_keylog_line[ 200 ];
	size_t const client_random_len = 32;
	size_t len = 0;
	size_t j;

	/* We're only interested in the TLS 1.2 master secret */
	if( secret_type != MBEDTLS_SSL_KEY_EXPORT_TLS12_MASTER_SECRET )
	return;

	((void) p_expkey);
	((void) server_random);
	((void) tls_prf_type);

	len += sprintf( nss_keylog_line + len,
	"%s", "CLIENT_RANDOM " );

	for( j = 0; j < client_random_len; j++ )
	{
	len += sprintf( nss_keylog_line + len,
	"%02x", client_random[j] );
	}

	len += sprintf( nss_keylog_line + len, " " );

	for( j = 0; j < secret_len; j++ )
	{
	len += sprintf( nss_keylog_line + len,
	"%02x", secret[j] );
	}

	len += sprintf( nss_keylog_line + len, "\n" );
	nss_keylog_line[ len ] = '\0';

	mbedtls_printf( "\n" );
	mbedtls_printf( "---------------- NSS KEYLOG -----------------\n" );
	mbedtls_printf( "%s", nss_keylog_line );
	mbedtls_printf( "---------------------------------------------\n" );

	if( opt.nss_keylog_file != NULL )
	{
	FILE *f;

	if( ( f = fopen( opt.nss_keylog_file, "a" ) ) == NULL )
	{
	goto exit;
	}

	if( fwrite( nss_keylog_line, 1, len, f ) != len )
	{
	fclose( f );
	goto exit;
	}

	fclose( f );
	}

	exit:
	mbedtls_platform_zeroize( nss_keylog_line,
	sizeof( nss_keylog_line ) );
	}

	#if defined( MBEDTLS_SSL_DTLS_SRTP )
	void dtls_srtp_key_derivation( void *p_expkey,
	mbedtls_ssl_key_export_type secret_type,
	const unsigned char *secret,
	size_t secret_len,
	const unsigned char client_random[32],
	const unsigned char server_random[32],
	mbedtls_tls_prf_types tls_prf_type )
	{
	dtls_srtp_keys keys = (dtls_srtp_keys )p_expkey;

	/* We're only interested in the TLS 1.2 master secret */
	if( secret_type != MBEDTLS_SSL_KEY_EXPORT_TLS12_MASTER_SECRET )
	return;
	if( secret_len != sizeof( keys->master_secret ) )
	return;

	memcpy( keys->master_secret, secret, sizeof( keys->master_secret ) );
	memcpy( keys->randbytes, client_random, 32 );
	memcpy( keys->randbytes + 32, server_random, 32 );
	keys->tls_prf_type = tls_prf_type;
	}
	#endif /* MBEDTLS_SSL_DTLS_SRTP */

	int ssl_check_record( mbedtls_ssl_context const *ssl,
	unsigned char const *buf, size_t len )
	{
	int my_ret = 0, ret_cr1, ret_cr2;
	unsigned char *tmp_buf;

	/* Record checking may modify the input buffer,
	* so make a copy. */
	tmp_buf = mbedtls_calloc( 1, len );
	if( tmp_buf == NULL )
	return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
	memcpy( tmp_buf, buf, len );

	ret_cr1 = mbedtls_ssl_check_record( ssl, tmp_buf, len );
	if( ret_cr1 != MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE )
	{
	/* Test-only: Make sure that mbedtls_ssl_check_record()
	* doesn't alter state. */
	memcpy( tmp_buf, buf, len ); /* Restore buffer */
	ret_cr2 = mbedtls_ssl_check_record( ssl, tmp_buf, len );
	if( ret_cr2 != ret_cr1 )
	{
	mbedtls_printf( "mbedtls_ssl_check_record() returned inconsistent results.\n" );
	my_ret = -1;
	goto cleanup;
	}

	switch( ret_cr1 )
	{
	case 0:
	break;

	case MBEDTLS_ERR_SSL_INVALID_RECORD:
	if( opt.debug_level > 1 )
	mbedtls_printf( "mbedtls_ssl_check_record() detected invalid record.\n" );
	break;

	case MBEDTLS_ERR_SSL_INVALID_MAC:
	if( opt.debug_level > 1 )
	mbedtls_printf( "mbedtls_ssl_check_record() detected unauthentic record.\n" );
	break;

	case MBEDTLS_ERR_SSL_UNEXPECTED_RECORD:
	if( opt.debug_level > 1 )
	mbedtls_printf( "mbedtls_ssl_check_record() detected unexpected record.\n" );
	break;

	default:
	mbedtls_printf( "mbedtls_ssl_check_record() failed fatally with -%#04x.\n", (unsigned int) -ret_cr1 );
	my_ret = -1;
	goto cleanup;
	}

	/* Regardless of the outcome, forward the record to the stack. */
	}

	cleanup:
	mbedtls_free( tmp_buf );

	return( my_ret );
	}

	int recv_cb( void ctx, unsigned char buf, size_t len )
	{
	io_ctx_t io_ctx = (io_ctx_t) ctx;
	size_t recv_len;
	int ret;

	if( opt.nbio == 2 )
	ret = delayed_recv( io_ctx->net, buf, len );
	else
	ret = mbedtls_net_recv( io_ctx->net, buf, len );
	if( ret < 0 )
	return( ret );
	recv_len = (size_t) ret;

	if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
	{
	/* Here's the place to do any datagram/record checking
	* in between receiving the packet from the underlying
	* transport and passing it on to the TLS stack. */
	if( ssl_check_record( io_ctx->ssl, buf, recv_len ) != 0 )
	return( -1 );
	}

	return( (int) recv_len );
	}

	int recv_timeout_cb( void ctx, unsigned char buf, size_t len,
	uint32_t timeout )
	{
	io_ctx_t io_ctx = (io_ctx_t) ctx;
	int ret;
	size_t recv_len;

	ret = mbedtls_net_recv_timeout( io_ctx->net, buf, len, timeout );
	if( ret < 0 )
	return( ret );
	recv_len = (size_t) ret;

	if( opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
	{
	/* Here's the place to do any datagram/record checking
	* in between receiving the packet from the underlying
	* transport and passing it on to the TLS stack. */
	if( ssl_check_record( io_ctx->ssl, buf, recv_len ) != 0 )
	return( -1 );
	}

	return( (int) recv_len );
	}

	int send_cb( void ctx, unsigned char const buf, size_t len )
	{
	io_ctx_t io_ctx = (io_ctx_t) ctx;

	if( opt.nbio == 2 )
	return( delayed_send( io_ctx->net, buf, len ) );

	return( mbedtls_net_send( io_ctx->net, buf, len ) );
	}

	#if defined(MBEDTLS_X509_CRT_PARSE_C)
	#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_RSA_C)
	#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
	/*
	* When GnuTLS/Openssl server is configured in TLS 1.2 mode with a certificate
	* declaring an RSA public key and Mbed TLS is configured in hybrid mode, if
	* `rsa_pss_rsae_` algorithms are before `rsa_pkcs1_` ones in this list then
	* the GnuTLS/Openssl server chooses an `rsa_pss_rsae_*` signature algorithm
	* for its signature in the key exchange message. As Mbed TLS 1.2 does not
	* support them, the handshake fails.
	*/
	#define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) \| MBEDTLS_SSL_SIG_ECDSA), \
	(( hash << 8 ) \| MBEDTLS_SSL_SIG_RSA), \
	( 0x800 \| hash ),
	#else
	#define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) \| MBEDTLS_SSL_SIG_ECDSA), \
	(( hash << 8 ) \| MBEDTLS_SSL_SIG_RSA),
	#endif
	#elif defined(MBEDTLS_ECDSA_C)
	#define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) \| MBEDTLS_SSL_SIG_ECDSA),
	#elif defined(MBEDTLS_RSA_C)
	#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
	/* See above */
	#define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) \| MBEDTLS_SSL_SIG_RSA), \
	( 0x800 \| hash ),
	#else
	#define MBEDTLS_SSL_SIG_ALG( hash ) (( hash << 8 ) \| MBEDTLS_SSL_SIG_RSA),
	#endif
	#else
	#define MBEDTLS_SSL_SIG_ALG( hash )
	#endif
	uint16_t ssl_sig_algs_for_test[] = {
	#if defined(MBEDTLS_SHA512_C)
	MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA512 )
	#endif
	#if defined(MBEDTLS_SHA384_C)
	MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA384 )
	#endif
	#if defined(MBEDTLS_SHA256_C)
	MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA256 )
	#endif
	#if defined(MBEDTLS_SHA224_C)
	MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA224 )
	#endif
	#if defined(MBEDTLS_SHA1_C)
	/* Allow SHA-1 as we use it extensively in tests. */
	MBEDTLS_SSL_SIG_ALG( MBEDTLS_SSL_HASH_SHA1 )
	#endif
	MBEDTLS_TLS1_3_SIG_NONE
	};
	#endif /* MBEDTLS_X509_CRT_PARSE_C */

	#if defined(MBEDTLS_X509_CRT_PARSE_C)
	/** Functionally equivalent to mbedtls_x509_crt_verify_info, see that function
	* for more info.
	*/
	int x509_crt_verify_info( char buf, size_t size, const char prefix,
	uint32_t flags )
	{
	#if !defined(MBEDTLS_X509_REMOVE_INFO)
	return( mbedtls_x509_crt_verify_info( buf, size, prefix, flags ) );

	#else /* !MBEDTLS_X509_REMOVE_INFO */
	int ret;
	char *p = buf;
	size_t n = size;

	#define X509_CRT_ERROR_INFO( err, err_str, info ) \
	if( ( flags & err ) != 0 ) \
	{ \
	ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, info ); \
	MBEDTLS_X509_SAFE_SNPRINTF; \
	flags ^= err; \
	}

	MBEDTLS_X509_CRT_ERROR_INFO_LIST
	#undef X509_CRT_ERROR_INFO

	if( flags != 0 )
	{
	ret = mbedtls_snprintf( p, n, "%sUnknown reason "
	"(this should not happen)\n", prefix );
	MBEDTLS_X509_SAFE_SNPRINTF;
	}

	return( (int) ( size - n ) );
	#endif /* MBEDTLS_X509_REMOVE_INFO */
	}
	#endif /* MBEDTLS_X509_CRT_PARSE_C */

	void mbedtls_print_supported_sig_algs( void )
	{
	mbedtls_printf( "supported signature algorithms:\n" );
	mbedtls_printf("\trsa_pkcs1_sha256 ");
	mbedtls_printf("rsa_pkcs1_sha384 ");
	mbedtls_printf("rsa_pkcs1_sha512\n");
	mbedtls_printf("\tecdsa_secp256r1_sha256 ");
	mbedtls_printf("ecdsa_secp384r1_sha384 ");
	mbedtls_printf("ecdsa_secp521r1_sha512\n");
	mbedtls_printf("\trsa_pss_rsae_sha256 ");
	mbedtls_printf("rsa_pss_rsae_sha384 ");
	mbedtls_printf("rsa_pss_rsae_sha512\n");
	mbedtls_printf("\trsa_pss_pss_sha256 ");
	mbedtls_printf("rsa_pss_pss_sha384 ");
	mbedtls_printf("rsa_pss_pss_sha512\n");
	mbedtls_printf("\ted25519 ");
	mbedtls_printf("ed448 ");
	mbedtls_printf("rsa_pkcs1_sha1 ");
	mbedtls_printf("ecdsa_sha1\n");
	mbedtls_printf( "\n" );
	}