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In mbedtls_ssl_tls13_generate_handshake_keys() and mbedtls_ssl_tls13_generate_application_keys(), avoid calling mbedtls_cipher_info_from_type()

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Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2022-05-05 15:34:39 +02:00
parent a8093f5c48
commit 4f4f271850
1 changed files with 62 additions and 0 deletions
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62
library/ssl_tls13_keys.c
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@ -1203,7 +1203,15 @@ int mbedtls_ssl_tls13_generate_handshake_keys( mbedtls_ssl_context *ssl,
unsigned char transcript[MBEDTLS_TLS1_3_MD_MAX_SIZE];
size_t transcript_len;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_key_type_t key_type;
psa_algorithm_t alg;
size_t key_bits;
size_t taglen;
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
#else
mbedtls_cipher_info_t const *cipher_info;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
size_t key_len, iv_len;
mbedtls_ssl_handshake_params *handshake = ssl->handshake;
@ -1212,9 +1220,32 @@ int mbedtls_ssl_tls13_generate_handshake_keys( mbedtls_ssl_context *ssl,
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_tls13_generate_handshake_keys" ) );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG )
taglen = 8;
else
taglen = 16;
status = mbedtls_ssl_cipher_to_psa( ciphersuite_info->cipher, taglen,
&alg, &key_type, &key_bits );
if( status != PSA_SUCCESS )
{
ret = psa_ssl_status_to_mbedtls( status );
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_cipher_to_psa", ret );
return ret;
}
key_len = PSA_BITS_TO_BYTES(key_bits);
if( PSA_ALG_IS_AEAD( alg ) )
iv_len = 12;
else
iv_len = PSA_CIPHER_IV_LENGTH( key_type, alg );
#else
cipher_info = mbedtls_cipher_info_from_type( ciphersuite_info->cipher );
key_len = cipher_info->key_bitlen >> 3;
iv_len = cipher_info->iv_size;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
md_type = ciphersuite_info->mac;
@ -1408,17 +1439,48 @@ int mbedtls_ssl_tls13_generate_application_keys(
size_t hash_len;
/* Variables relating to the cipher for the chosen ciphersuite. */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_key_type_t key_type;
psa_algorithm_t alg;
size_t key_bits;
size_t taglen;
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
#else
mbedtls_cipher_info_t const *cipher_info;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
size_t key_len, iv_len;
MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive application traffic keys" ) );
/* Extract basic information about hash and ciphersuite */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( handshake->ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_SHORT_TAG )
taglen = 8;
else
taglen = 16;
status = mbedtls_ssl_cipher_to_psa( handshake->ciphersuite_info->cipher,
taglen, &alg, &key_type, &key_bits );
if( status != PSA_SUCCESS )
{
ret = psa_ssl_status_to_mbedtls( status );
MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_cipher_to_psa", ret );
goto cleanup;
}
key_len = PSA_BITS_TO_BYTES(key_bits);
if( PSA_ALG_IS_AEAD( alg ) )
iv_len = 12;
else
iv_len = PSA_CIPHER_IV_LENGTH( key_type, alg );
#else
cipher_info = mbedtls_cipher_info_from_type(
handshake->ciphersuite_info->cipher );
key_len = cipher_info->key_bitlen / 8;
iv_len = cipher_info->iv_size;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
md_type = handshake->ciphersuite_info->mac;