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Removes truncated HMAC code from ssl_tls.c

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Removes conditional code compilation blocks
and code paths relating to the
MBEDTLS_SSL_TRUNCATED_HMAC config option.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
This commit is contained in:
Thomas Daubney 2021-06-14 17:25:08 +01:00
parent 40d49b1e54
commit 32fb900eee
1 changed files with 0 additions and 46 deletions
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46
library/ssl_tls.c
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@ -672,9 +672,6 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
int encrypt_then_mac,
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
int trunc_hmac,
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */
ssl_tls_prf_t tls_prf,
const unsigned char randbytes[64],
@ -845,18 +842,6 @@ static int ssl_populate_transform( mbedtls_ssl_transform *transform,
mac_key_len = mbedtls_md_get_size( md_info );
transform->maclen = mac_key_len;
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
/*
* If HMAC is to be truncated, we shall keep the leftmost bytes,
* (rfc 6066 page 13 or rfc 2104 section 4),
* so we only need to adjust the length here.
*/
if( trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
{
transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
}
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
/* IV length */
transform->ivlen = cipher_info->iv_size;
@ -1368,9 +1353,6 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
ssl->session_negotiate->encrypt_then_mac,
#endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
ssl->session_negotiate->trunc_hmac,
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */
ssl->handshake->tls_prf,
ssl->handshake->randbytes,
@ -4138,13 +4120,6 @@ int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_c
}
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate )
{
conf->trunc_hmac = truncate;
}
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
{
conf->allow_legacy_renegotiation = allow_legacy;
@ -4519,11 +4494,7 @@ const mbedtls_ssl_session *mbedtls_ssl_get_session_pointer( const mbedtls_ssl_co
#define SSL_SERIALIZED_SESSION_CONFIG_MFL 0
#endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 1
#else
#define SSL_SERIALIZED_SESSION_CONFIG_TRUNC_HMAC 0
#endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
#define SSL_SERIALIZED_SESSION_CONFIG_ETM 1
@ -4766,13 +4737,6 @@ static int ssl_session_save( const mbedtls_ssl_session *session,
*p++ = session->mfl_code;
#endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
used += 1;
if( used <= buf_len )
*p++ = (unsigned char)( ( session->trunc_hmac ) & 0xFF );
#endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
used += 1;
@ -5008,13 +4972,6 @@ static int ssl_session_load( mbedtls_ssl_session *session,
session->mfl_code = *p++;
#endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
if( 1 > (size_t)( end - p ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
session->trunc_hmac = *p++;
#endif
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
if( 1 > (size_t)( end - p ) )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
@ -5831,9 +5788,6 @@ static int ssl_context_load( mbedtls_ssl_context *ssl,
#if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
ssl->session->encrypt_then_mac,
#endif
#if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
ssl->session->trunc_hmac,
#endif
#endif /* MBEDTLS_SSL_SOME_SUITES_USE_MAC */
ssl_tls12prf_from_cs( ssl->session->ciphersuite ),
p, /* currently pointing to randbytes */