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/*
* Copyright (C) 2015 Nico von Geyso <nico.geyso@fu-berlin.de>
* Copyright (C) 2015 René Kijewski <rene.kijewski@fu-berlin.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
#include "crypto/helper.h"
void crypto_block_inc_ctr(uint8_t block[16], int L)
{
uint8_t *b = &block[15];
for (int i = 0; i < L; ++i, --b) {
if (++*b != 0) {
break;
}
}
}
int crypto_equals(uint8_t *a, uint8_t *b, size_t len)
{
uint8_t diff = 0;
for (size_t i = 0; i < len; ++i, ++a, ++b) {
diff |= (*a ^ *b);
}
diff |= (diff >> 1) | (diff << 7);
diff |= (diff >> 2) | (diff << 6);
diff |= (diff >> 4) | (diff << 4);
++diff;
return diff;
}