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Merge remote-tracking branch 'upstream-restricted/pr/435' into mbedtls-1.3-restricted

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This commit is contained in:
Gilles Peskine 2017-12-19 19:39:59 +01:00
commit b2da79c108
1 changed files with 17 additions and 8 deletions
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25
library/ssl_tls.c
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@ -1050,9 +1050,12 @@ int ssl_psk_derive_premaster( ssl_context *ssl, key_exchange_type_t key_ex )
/*
* SSLv3.0 MAC functions
*/
static void ssl_mac( md_context_t *md_ctx, unsigned char *secret,
unsigned char *buf, size_t len,
unsigned char *ctr, int type )
#define SSL_MAC_MAX_BYTES 20 /* MD-5 or SHA-1 */
static void ssl_mac( md_context_t *md_ctx,
const unsigned char *secret,
const unsigned char *buf, size_t len,
const unsigned char *ctr, int type,
unsigned char out[SSL_MAC_MAX_BYTES] )
{
unsigned char header[11];
unsigned char padding[48];
@ -1077,14 +1080,14 @@ static void ssl_mac( md_context_t *md_ctx, unsigned char *secret,
md_update( md_ctx, padding, padlen );
md_update( md_ctx, header, 11 );
md_update( md_ctx, buf, len );
md_finish( md_ctx, buf + len );
md_finish( md_ctx, out );
memset( padding, 0x5C, padlen );
md_starts( md_ctx );
md_update( md_ctx, secret, md_size );
md_update( md_ctx, padding, padlen );
md_update( md_ctx, buf + len, md_size );
md_finish( md_ctx, buf + len );
md_update( md_ctx, out, md_size );
md_finish( md_ctx, out );
}
#endif /* POLARSSL_SSL_PROTO_SSL3 */
@ -1130,10 +1133,15 @@ static int ssl_encrypt_buf( ssl_context *ssl )
#if defined(POLARSSL_SSL_PROTO_SSL3)
if( ssl->minor_ver == SSL_MINOR_VERSION_0 )
{
unsigned char mac[SSL_MAC_MAX_BYTES];
ssl_mac( &ssl->transform_out->md_ctx_enc,
ssl->transform_out->mac_enc,
ssl->out_msg, ssl->out_msglen,
ssl->out_ctr, ssl->out_msgtype );
ssl->out_ctr, ssl->out_msgtype,
mac );
memcpy( ssl->out_msg + ssl->out_msglen, mac, ssl->transform_out->maclen );
}
else
#endif
@ -1790,7 +1798,8 @@ static int ssl_decrypt_buf( ssl_context *ssl )
ssl_mac( &ssl->transform_in->md_ctx_dec,
ssl->transform_in->mac_dec,
ssl->in_msg, ssl->in_msglen,
ssl->in_ctr, ssl->in_msgtype );
ssl->in_ctr, ssl->in_msgtype,
mac_expect );
}
else
#endif /* POLARSSL_SSL_PROTO_SSL3 */