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Make gcm counter increment more efficient

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2024-01-14 12:59:49 +00:00
parent 174eeff235
commit 46697da5b3
1 changed files with 3 additions and 6 deletions
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9
library/gcm.c
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@ -401,12 +401,9 @@ int mbedtls_gcm_update_ad(mbedtls_gcm_context *ctx,
/* Increment the counter. */
static void gcm_incr(unsigned char y[16])
{
size_t i;
for (i = 16; i > 12; i--) {
if (++y[i - 1] != 0) {
break;
}
}
uint32_t x = MBEDTLS_GET_UINT32_BE(y, 12);
x++;
MBEDTLS_PUT_UINT32_BE(x, y, 12);
}
/* Calculate and apply the encryption mask. Process use_len bytes of data,