shadow_32bit.c

/* MIT 
 *
 * Copyright (c) 2019 Gaëtan Cassiers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <string.h>
#include <stdint.h>
#include "primitives.h"

#define SHADOW
#include "primitives.c"

#define CLYDE_128_NS 6                // Number of steps
#define CLYDE_128_NR 2 * CLYDE_128_NS // Number of rounds
#define SHADOW_NS 6                   // Number of steps
#define SHADOW_NR 2 * SHADOW_NS       // Number of roundsv
void shadow(shadow_state state) {
    uint32_t lfsr =0xf8737400;	// LFSR for round constant
    set_poly_xtime(0x101);
    set_poly_lfsr(0xc5);
    for (unsigned int s = 0; s < SHADOW_NS; s++) {
        #pragma GCC unroll 0
        for (unsigned int b = 0; b < MLS_BUNDLES; b++){
            sbox_layer(state[b]);
            lbox(&state[b][0], &state[b][1]);
            lbox(&state[b][2], &state[b][3]);

            state[b][1] ^= lfsr;
            lfsr = update_lfsr(lfsr);
            sbox_layer(state[b]);
        }
        dbox_mls_layer(state,&lfsr);

    }
}