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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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20
library/psa_crypto_core.h
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@ -30,6 +30,26 @@
#include "psa/crypto.h"
#include "psa/crypto_se_driver.h"
/** Constant-time buffer comparison
*
* \param[in] a Left-hand buffer for comparison.
* \param[in] b Right-hand buffer for comparison.
* \param n Amount of bytes to compare.
*
* \return 0 if the buffer contents are equal, non-zero otherwise
*/
static inline int mbedtls_psa_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 );
}
/** The data structure representing a key slot, containing key material
* and metadata for one key.
*/