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decryption_key_schedule.c
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decryption_key_schedule.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 Dmitry Khovratovich <[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 "key_schedule.h"
#include "constants.h"
void RunDecryptionKeySchedule(uint8_t *key, uint8_t *roundKeys)
{
uint32_t* rk = (uint32_t*)roundKeys;
uint8_t* rkTemp;
uint32_t x0, x1, x2, x3;
uint8_t i;
KeySchedule(key, roundKeys);
for (i = 4; i < 40; ++i)
{
rkTemp = roundKeys + (i << 2); // i * 4
x0 = rkTemp[0];
inv_MC0(x0)
x1 = rkTemp[1];
inv_MC1(x1)
x2 = rkTemp[2];
inv_MC2(x2)
x3 = rkTemp[3];
inv_MC3(x3)
rk[i] = x0 ^ x1 ^ x2 ^ x3;
}
}