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Reduce indentation in ssl_compute_master()

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Exit earlier when there's noting to do.

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This commit is contained in:
Manuel Pégourié-Gonnard 2019-05-03 09:16:16 +02:00
parent 7edd5876ce
commit dafe5227d4
1 changed files with 41 additions and 50 deletions
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91
library/ssl_tls.c
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@ -1094,7 +1094,7 @@ static int ssl_set_handshake_prfs( mbedtls_ssl_handshake_params *handshake,
} }
/* /*
* Compute master secret * Compute master secret if needed
*/ */
static int ssl_compute_master( mbedtls_ssl_context *ssl ) static int ssl_compute_master( mbedtls_ssl_context *ssl )
{ {
@ -1103,65 +1103,46 @@ static int ssl_compute_master( mbedtls_ssl_context *ssl )
const mbedtls_ssl_ciphersuite_t *ciphersuite_info = handshake->ciphersuite_info; const mbedtls_ssl_ciphersuite_t *ciphersuite_info = handshake->ciphersuite_info;
mbedtls_ssl_session *session = ssl->session_negotiate; mbedtls_ssl_session *session = ssl->session_negotiate;
/* if( handshake->resume != 0 )
* SSLv3:
* master =
* MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
* MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
* MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
*
* TLSv1+:
* master = PRF( premaster, "master secret", randbytes )[0..47]
*/
if( handshake->resume == 0 )
{ {
MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster, MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
handshake->pmslen ); return( 0 );
}
MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster,
handshake->pmslen );
#if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET) #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED ) if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
{ {
unsigned char session_hash[48]; unsigned char session_hash[48];
size_t hash_len; size_t hash_len;
MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) ); MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
ssl->handshake->calc_verify( ssl, session_hash ); ssl->handshake->calc_verify( ssl, session_hash );
#if defined(MBEDTLS_SSL_PROTO_TLS1_2) #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 ) if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
{ {
#if defined(MBEDTLS_SHA512_C) #if defined(MBEDTLS_SHA512_C)
if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 ) if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
{ {
hash_len = 48; hash_len = 48;
}
else
#endif
hash_len = 32;
} }
else else
#endif /* MBEDTLS_SSL_PROTO_TLS1_2 */ #endif
hash_len = 36; hash_len = 32;
MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
"extended master secret",
session_hash, hash_len,
session->master, 48 );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
return( ret );
}
} }
else else
#endif #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
hash_len = 36;
MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
ret = handshake->tls_prf( handshake->premaster, handshake->pmslen, ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
"master secret", "extended master secret",
handshake->randbytes, 64, session_hash, hash_len,
session->master, 48 ); session->master, 48 );
if( ret != 0 ) if( ret != 0 )
{ {
@ -1169,11 +1150,21 @@ static int ssl_compute_master( mbedtls_ssl_context *ssl )
return( ret ); return( ret );
} }
mbedtls_platform_zeroize( handshake->premaster,
sizeof(handshake->premaster) );
} }
else else
MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) ); #endif
ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
"master secret",
handshake->randbytes, 64,
session->master, 48 );
if( ret != 0 )
{
MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
return( ret );
}
mbedtls_platform_zeroize( handshake->premaster,
sizeof(handshake->premaster) );
return( 0 ); return( 0 );
} }