yuzu-emu/mbedtls
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Remove superfluous length check

Browse source 
The key passed to the driver has been imported by the PSA Core, meaning
its length has already been verified, and the driver can rely on the
buffer length and key attributes being consistent.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman 2021-05-06 18:00:37 +02:00
parent 094a77e79c
commit dcd0811501
1 changed files with 5 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
library/psa_crypto_mac.c
View file

@ -196,8 +196,7 @@ exit:
#if defined(BUILTIN_ALG_CMAC)
static psa_status_t cmac_setup( mbedtls_psa_mac_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
size_t key_buffer_size )
const uint8_t *key_buffer )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const mbedtls_cipher_info_t * cipher_info =
@ -210,9 +209,6 @@ static psa_status_t cmac_setup( mbedtls_psa_mac_operation_t *operation,
if( cipher_info == NULL )
return( PSA_ERROR_NOT_SUPPORTED );
if( key_buffer_size < PSA_BITS_TO_BYTES( psa_get_key_bits( attributes ) ) )
return( PSA_ERROR_INVALID_ARGUMENT );
ret = mbedtls_cipher_setup( &operation->ctx.cmac, cipher_info );
if( ret != 0 )
goto exit;
@ -335,8 +331,10 @@ static psa_status_t mac_setup( mbedtls_psa_mac_operation_t *operation,
#if defined(BUILTIN_ALG_CMAC)
if( PSA_ALG_FULL_LENGTH_MAC( alg ) == PSA_ALG_CMAC )
{
status = cmac_setup( operation, attributes,
key_buffer, key_buffer_size );
/* Key buffer size for CMAC is dictated by the key bits set on the
* attributes, and previously validated by the core on key import. */
(void) key_buffer_size;
status = cmac_setup( operation, attributes, key_buffer );
}
else
#endif /* BUILTIN_ALG_CMAC */