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Make safer_memcmp available to all compile units under PSA

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Now renamed to mbedtls_psa_safer_memcmp, it provides a single location
for buffer comparison.

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
This commit is contained in:
Steven Cooreman
2021-04-29 16:37:59 +02:00
parent b4b9b2879c
commit a2a1b803da
3 changed files with 23 additions and 29 deletions
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18
library/psa_crypto.c
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@ -93,20 +93,6 @@
#define ARRAY_LENGTH( array ) ( sizeof( array ) / sizeof( *( array ) ) )
/* constant-time buffer comparison */
static inline int safer_memcmp( const uint8_t *a, const uint8_t *b, size_t n )
{
size_t i;
unsigned char diff = 0;
for( i = 0; i < n; i++ )
diff |= a[i] ^ b[i];
return( diff );
}
/****************************************************************/
/* Global data, support functions and library management */
/****************************************************************/
@ -2235,7 +2221,7 @@ psa_status_t psa_hash_verify( psa_hash_operation_t *operation,
return( status );
if( actual_hash_length != hash_length )
return( PSA_ERROR_INVALID_SIGNATURE );
if( safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
if( mbedtls_psa_safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
return( PSA_ERROR_INVALID_SIGNATURE );
return( PSA_SUCCESS );
}
@ -2271,7 +2257,7 @@ psa_status_t psa_hash_compare( psa_algorithm_t alg,
return( status );
if( actual_hash_length != hash_length )
return( PSA_ERROR_INVALID_SIGNATURE );
if( safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
if( mbedtls_psa_safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
return( PSA_ERROR_INVALID_SIGNATURE );
return( PSA_SUCCESS );
}