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encrypt.c
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encrypt.c
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/*
*
* University of Luxembourg
* Laboratory of Algorithmics, Cryptology and Security (LACS)
*
* FELICS - Fair Evaluation of Lightweight Cryptographic Systems
*
* Copyright (C) 2015 University of Luxembourg
*
* Written in 2015 by Daniel Dinu <[email protected]>
*
* This file is part of FELICS.
*
* FELICS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* FELICS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdint.h>
#include "cipher.h"
#include "constants.h"
#include "rot32.h"
#include "speckey.h"
void Encrypt(uint8_t *block, uint8_t *roundKeys)
{
uint8_t i;
uint32_t *block32 = (uint32_t *)block;
uint32_t *roundKeys32 = (uint32_t *)roundKeys;
uint32_t left, right, temp;
left = block32[0];
right = block32[1];
for (i = NUMBER_OF_ROUNDS; i > 0; i--)
{
/* left branch */
left ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys32[0]);
left = speckey((uint16_t) left, (uint16_t)(left >> 16));
left ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys32[1]);
left = speckey((uint16_t) left, (uint16_t)(left >> 16));
left ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys32[2]);
left = speckey((uint16_t) left, (uint16_t)(left >> 16));
/* right branch */
right ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys32[3]);
right = speckey((uint16_t) right, (uint16_t)(right >> 16));
right ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys32[4]);
right = speckey((uint16_t) right, (uint16_t)(right >> 16));
right ^= READ_ROUND_KEY_DOUBLE_WORD(roundKeys32[5]);
right = speckey((uint16_t) right, (uint16_t)(right >> 16));
/* linear layer */
temp = left;
left = right ^ (left ^ rot32l8(left) ^ rot32r8(left));
right = temp;
roundKeys32 += 6;
}
/* Post Whitening */
block32[0] = left ^ READ_ROUND_KEY_DOUBLE_WORD(roundKeys32[0]);
block32[1] = right ^ READ_ROUND_KEY_DOUBLE_WORD(roundKeys32[1]);
}