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Make gcm counter increment more efficient

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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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. */ /* Increment the counter. */
static void gcm_incr(unsigned char y[16]) static void gcm_incr(unsigned char y[16])
{ {
size_t i; uint32_t x = MBEDTLS_GET_UINT32_BE(y, 12);
for (i = 16; i > 12; i--) { x++;
if (++y[i - 1] != 0) { MBEDTLS_PUT_UINT32_BE(x, y, 12);
break;
}
}
} }
/* Calculate and apply the encryption mask. Process use_len bytes of data, /* Calculate and apply the encryption mask. Process use_len bytes of data,