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Update CertificateRequest tests and the parsing function

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Signed-off-by: Xiaofei Bai <xiaofei.bai@arm.com>
This commit is contained in:
Xiaofei Bai
2022-01-20 08:25:00 +00:00
parent de3f13e0b8
commit 69fcd39774
4 changed files with 119 additions and 90 deletions
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72
library/ssl_tls13_generic.c
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@@ -220,6 +220,78 @@ int mbedtls_ssl_tls13_write_sig_alg_ext( mbedtls_ssl_context *ssl,
return( 0 );
}
/* mbedtls_ssl_tls13_parse_sig_alg_ext()
*
* enum {
* ....
* ecdsa_secp256r1_sha256( 0x0403 ),
* ecdsa_secp384r1_sha384( 0x0503 ),
* ecdsa_secp521r1_sha512( 0x0603 ),
* ....
* } SignatureScheme;
*
* struct {
* SignatureScheme supported_signature_algorithms<2..2^16-2>;
* } SignatureSchemeList;
*/
int mbedtls_ssl_tls13_parse_sig_alg_ext( mbedtls_ssl_context *ssl,
const unsigned char *buf,
const unsigned char *end )
{
const unsigned char *p = buf;
const uint16_t *sig_alg;
unsigned int signature_scheme; /* store received signature algorithm scheme */
uint32_t common_idx = 0; /* iterate through received signature schemes list */
/* skip 2 bytes of signature algorithms length */
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
p += 2;
memset( ssl->handshake->sig_algs, 0, sizeof( ssl->handshake->sig_algs ) );
while( p < end && common_idx + 1 < MBEDTLS_PK_SIGNATURE_MAX_SIZE )
{
MBEDTLS_SSL_CHK_BUF_READ_PTR( p, end, 2 );
signature_scheme = MBEDTLS_GET_UINT16_BE( p, 0 );
p += 2;
MBEDTLS_SSL_DEBUG_MSG( 4, ( "received signature algorithm: 0x%x",
signature_scheme ) );
for( sig_alg = ssl->conf->tls13_sig_algs;
*sig_alg != MBEDTLS_TLS1_3_SIG_NONE; sig_alg++ )
{
if( *sig_alg == signature_scheme )
{
ssl->handshake->sig_algs[common_idx] = signature_scheme;
common_idx++;
break;
}
}
}
/* Check that we consumed all the message. */
if( p != end )
{
MBEDTLS_SSL_DEBUG_MSG( 1,
( "Signature algorithms extension length misaligned" ) );
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR,
MBEDTLS_ERR_SSL_DECODE_ERROR );
return( MBEDTLS_ERR_SSL_DECODE_ERROR );
}
if( common_idx == 0 )
{
MBEDTLS_SSL_DEBUG_MSG( 3, ( "no signature algorithm in common" ) );
MBEDTLS_SSL_PEND_FATAL_ALERT( MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE,
MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
return( MBEDTLS_ERR_SSL_HANDSHAKE_FAILURE );
}
ssl->handshake->sig_algs[common_idx] = MBEDTLS_TLS1_3_SIG_NONE;
return( 0 );
}
/*
* STATE HANDLING: Read CertificateVerify
*/