eden-emu/mbedtls
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Move contatnt-time memcmp functions to the contant-time module

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Signed-off-by: gabor-mezei-arm <gabor.mezei@arm.com>
This commit is contained in:
gabor-mezei-arm 2021-09-27 11:28:54 +02:00
parent 9fa43ce238
commit db9a38c672
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GPG key ID: 106F5A41ECC305BD
11 changed files with 112 additions and 77 deletions
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22
library/cipher.c
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@ -29,6 +29,7 @@
#include "cipher_wrap.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include "constant_time.h"
#include <stdlib.h>
#include <string.h>
@ -74,27 +75,6 @@
#define CIPHER_VALIDATE( cond ) \
MBEDTLS_INTERNAL_VALIDATE( cond )
#if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
/* Compare the contents of two buffers in constant time.
* Returns 0 if the contents are bitwise identical, otherwise returns
* a non-zero value.
* This is currently only used by GCM and ChaCha20+Poly1305.
*/
static int mbedtls_constant_time_memcmp( const void *v1, const void *v2,
size_t len )
{
const unsigned char *p1 = (const unsigned char*) v1;
const unsigned char *p2 = (const unsigned char*) v2;
size_t i;
unsigned char diff;
for( diff = 0, i = 0; i < len; i++ )
diff |= p1[i] ^ p2[i];
return( (int)diff );
}
#endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
static int supported_init = 0;
const int *mbedtls_cipher_list( void )