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Make calc_verify() return the length as well

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Simplifies ssl_compute_hash(), but unfortunately not so much the other uses.
This commit is contained in:
Manuel Pégourié-Gonnard 2019-05-03 11:43:28 +02:00
parent ed3b7a9492
commit a575975280
4 changed files with 36 additions and 46 deletions
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2
include/mbedtls/ssl_internal.h
View file

@ -390,7 +390,7 @@ struct mbedtls_ssl_handshake_params
#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 *);
void (*calc_verify)(const mbedtls_ssl_context *, unsigned char *, size_t *);
void (*calc_finished)(mbedtls_ssl_context *, unsigned char *, int);
int (*tls_prf)(const unsigned char *, size_t, const char *,
const unsigned char *, size_t,

5
library/ssl_cli.c
View file

@ -3217,7 +3217,7 @@ static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
unsigned char hash[48];
unsigned char *hash_start = hash;
mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
unsigned int hashlen;
size_t hashlen;
void *rs_ctx = NULL;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
@ -3270,7 +3270,7 @@ static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
sign:
#endif
ssl->handshake->calc_verify( ssl, hash );
ssl->handshake->calc_verify( ssl, hash, &hashlen );
#if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
defined(MBEDTLS_SSL_PROTO_TLS1_1)
@ -3288,7 +3288,6 @@ sign:
* sha_hash
* SHA(handshake_messages);
*/
hashlen = 36;
md_alg = MBEDTLS_MD_NONE;
/*

5
library/ssl_srv.c
View file

@ -4163,7 +4163,10 @@ static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
}
/* Calculate hash and verify signature */
ssl->handshake->calc_verify( ssl, hash );
{
size_t dummy_hlen;
ssl->handshake->calc_verify( ssl, hash, &dummy_hlen );
}
if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
md_alg, hash_start, hashlen,

70
library/ssl_tls.c
View file

@ -584,25 +584,25 @@ static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned c
#endif
#if defined(MBEDTLS_SSL_PROTO_SSL3)
static void ssl_calc_verify_ssl( const mbedtls_ssl_context *, unsigned char * );
static void ssl_calc_verify_ssl( const mbedtls_ssl_context *, unsigned char *, size_t * );
static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int );
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
static void ssl_calc_verify_tls( const mbedtls_ssl_context *, unsigned char * );
static void ssl_calc_verify_tls( const mbedtls_ssl_context *, unsigned char *, size_t * );
static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int );
#endif
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
static void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *,unsigned char * );
static void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *,unsigned char *, size_t * );
static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
#endif
#if defined(MBEDTLS_SHA512_C)
static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
static void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *, unsigned char * );
static void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *, unsigned char *, size_t * );
static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
@ -1100,14 +1100,10 @@ static int ssl_set_handshake_prfs( mbedtls_ssl_handshake_params *handshake,
* [in/out] handshake
* [in] resume, premaster, extended_ms, calc_verify, tls_prf
* [out] premaster (cleared)
* [in] minor_ver (to compute hash_len)
* [in] hash_alg (to compute hash_len)
* [out] master
* [in] ssl: optionally used for debugging and calc_verify
*/
static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
int minor_ver,
mbedtls_md_type_t hash_alg,
unsigned char *master,
const mbedtls_ssl_context *ssl )
{
@ -1115,12 +1111,6 @@ static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
#if !defined(MBEDTLS_DEBUG_C) && !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
(void) ssl;
#endif
#if !defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) || !defined(MBEDTLS_SSL_PROTO_TLS1_2)
(void) minor_ver;
#if defined(MBEDTLS_SHA512_C)
(void) hash_alg;
#endif
#endif
if( handshake->resume != 0 )
@ -1140,23 +1130,7 @@ static int ssl_compute_master( mbedtls_ssl_handshake_params *handshake,
MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
handshake->calc_verify( ssl, session_hash );
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
{
#if defined(MBEDTLS_SHA512_C)
if( hash_alg == MBEDTLS_MD_SHA384 )
{
hash_len = 48;
}
else
#endif
hash_len = 32;
}
else
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
hash_len = 36;
handshake->calc_verify( ssl, session_hash, &hash_len );
MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
@ -1205,8 +1179,6 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
}
ret = ssl_compute_master( ssl->handshake,
ssl->minor_ver,
ciphersuite_info->mac,
ssl->session_negotiate->master,
ssl );
if( ret != 0 )
@ -1219,7 +1191,9 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
}
#if defined(MBEDTLS_SSL_PROTO_SSL3)
void ssl_calc_verify_ssl( const mbedtls_ssl_context *ssl, unsigned char hash[36] )
void ssl_calc_verify_ssl( const mbedtls_ssl_context *ssl,
unsigned char hash[36],
size_t *hlen )
{
mbedtls_md5_context md5;
mbedtls_sha1_context sha1;
@ -1257,7 +1231,9 @@ void ssl_calc_verify_ssl( const mbedtls_ssl_context *ssl, unsigned char hash[36]
mbedtls_sha1_update_ret( &sha1, hash + 16, 20 );
mbedtls_sha1_finish_ret( &sha1, hash + 16 );
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
*hlen = 36;
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen );
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
mbedtls_md5_free( &md5 );
@ -1268,7 +1244,9 @@ void ssl_calc_verify_ssl( const mbedtls_ssl_context *ssl, unsigned char hash[36]
#endif /* MBEDTLS_SSL_PROTO_SSL3 */
#if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
void ssl_calc_verify_tls( const mbedtls_ssl_context *ssl, unsigned char hash[36] )
void ssl_calc_verify_tls( const mbedtls_ssl_context *ssl,
unsigned char hash[36],
size_t *hlen )
{
mbedtls_md5_context md5;
mbedtls_sha1_context sha1;
@ -1284,7 +1262,9 @@ void ssl_calc_verify_tls( const mbedtls_ssl_context *ssl, unsigned char hash[36]
mbedtls_md5_finish_ret( &md5, hash );
mbedtls_sha1_finish_ret( &sha1, hash + 16 );
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
*hlen = 36;
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen );
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
mbedtls_md5_free( &md5 );
@ -1296,7 +1276,9 @@ void ssl_calc_verify_tls( const mbedtls_ssl_context *ssl, unsigned char hash[36]
#if defined(MBEDTLS_SSL_PROTO_TLS1_2)
#if defined(MBEDTLS_SHA256_C)
void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *ssl, unsigned char hash[32] )
void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *ssl,
unsigned char hash[32],
size_t *hlen )
{
mbedtls_sha256_context sha256;
@ -1307,7 +1289,9 @@ void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *ssl, unsigned char h
mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
mbedtls_sha256_finish_ret( &sha256, hash );
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 );
*hlen = 32;
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen );
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
mbedtls_sha256_free( &sha256 );
@ -1317,7 +1301,9 @@ void ssl_calc_verify_tls_sha256( const mbedtls_ssl_context *ssl, unsigned char h
#endif /* MBEDTLS_SHA256_C */
#if defined(MBEDTLS_SHA512_C)
void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *ssl, unsigned char hash[48] )
void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *ssl,
unsigned char hash[48],
size_t *hlen )
{
mbedtls_sha512_context sha512;
@ -1328,7 +1314,9 @@ void ssl_calc_verify_tls_sha384( const mbedtls_ssl_context *ssl, unsigned char h
mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
mbedtls_sha512_finish_ret( &sha512, hash );
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 );
*hlen = 48;
MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, *hlen );
MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
mbedtls_sha512_free( &sha512 );