Make gcm counter increment more efficient
Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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1 changed files with 3 additions and 6 deletions
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@ -401,12 +401,9 @@ int mbedtls_gcm_update_ad(mbedtls_gcm_context *ctx,
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/* Increment the counter. */
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static void gcm_incr(unsigned char y[16])
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{
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size_t i;
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for (i = 16; i > 12; i--) {
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if (++y[i - 1] != 0) {
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break;
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}
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}
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uint32_t x = MBEDTLS_GET_UINT32_BE(y, 12);
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x++;
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MBEDTLS_PUT_UINT32_BE(x, y, 12);
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}
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/* Calculate and apply the encryption mask. Process use_len bytes of data,
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