3 This file is part of the ARM-Crypto-Lib.
4 Copyright (C) 2006-2010 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "aes_enc_round.h"
26 void aes_shiftcol(void* data, uint8_t shift){
28 tmp[0] = ((uint8_t*)data)[ 0];
29 tmp[1] = ((uint8_t*)data)[ 4];
30 tmp[2] = ((uint8_t*)data)[ 8];
31 tmp[3] = ((uint8_t*)data)[12];
32 ((uint8_t*)data)[ 0] = tmp[(shift+0)&3];
33 ((uint8_t*)data)[ 4] = tmp[(shift+1)&3];
34 ((uint8_t*)data)[ 8] = tmp[(shift+2)&3];
35 ((uint8_t*)data)[12] = tmp[(shift+3)&3];
38 #define GF256MUL_1(a) (a)
39 #define GF256MUL_2(a) (gf256mul(2, (a), 0x1b))
40 #define GF256MUL_3(a) (gf256mul(3, (a), 0x1b))
42 void aes_enc_round(aes_cipher_state_t* state, const aes_roundkey_t* k){
47 tmp[i] = aes_sbox[state->s[i]];
50 aes_shiftcol(tmp+1, 1);
51 aes_shiftcol(tmp+2, 2);
52 aes_shiftcol(tmp+3, 3);
55 t = tmp[4*i+0] ^ tmp[4*i+1] ^ tmp[4*i+2] ^ tmp[4*i+3];
57 GF256MUL_2(tmp[4*i+0]^tmp[4*i+1])
61 GF256MUL_2(tmp[4*i+1]^tmp[4*i+2])
65 GF256MUL_2(tmp[4*i+2]^tmp[4*i+3])
69 GF256MUL_2(tmp[4*i+3]^tmp[4*i+0])
76 state->s[i] ^= k->ks[i];