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Eliminate duplicate ct memcmp

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman
2023-09-11 18:25:16 +01:00
parent f4cf4a6e25
commit c280520999
3 changed files with 6 additions and 12 deletions
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6
library/ccm.c
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@ -33,6 +33,7 @@
#include "mbedtls/ccm.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include "mbedtls/constant_time.h"
#include <string.h>
@ -362,7 +363,6 @@ int mbedtls_ccm_star_auth_decrypt(mbedtls_ccm_context *ctx, size_t length,
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char check_tag[16];
unsigned char i;
int diff;
CCM_VALIDATE_RET(ctx != NULL);
@ -379,9 +379,7 @@ int mbedtls_ccm_star_auth_decrypt(mbedtls_ccm_context *ctx, size_t length,
}
/* Check tag in "constant-time" */
for (diff = 0, i = 0; i < tag_len; i++) {
diff |= tag[i] ^ check_tag[i];
}
diff = mbedtls_ct_memcmp(tag, check_tag, tag_len);
if (diff != 0) {
mbedtls_platform_zeroize(output, length);