3 This file is part of the AVR-Crypto-Lib.
4 Copyright (C) 2008 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/>.
22 * email: daniel.otte@rub.de
32 #define S(i) ((((*ctx)[(i)/8])>>((i)%8))&1)
33 uint8_t trivium_enc(trivium_ctx_t* ctx){
40 t1 ^= (S(90) & S(91)) ^ S(170);
41 t2 ^= (S(174) & S(175)) ^ S(263);
42 t3 ^= (S(285) & S(286)) ^ S(68);
44 /* shift whole state and insert ts later */
48 (*ctx)[i] = (((*ctx)[i])<<1)|c1;
52 (*ctx)[0] = (((*ctx)[0])&0xFE)| t3; /* s0*/
53 (*ctx)[93/8] = (((*ctx)[93/8])& (~(1<<(93%8)))) | (t1<<(93%8)); /* s93 */
54 (*ctx)[177/8] = (((*ctx)[177/8])& (~(1<<(177%8)))) | (t2<<(177%8));/* s177 */
59 #define KEYSIZE_B ((keysize_b+7)/8)
60 #define IVSIZE_B ((ivsize_b +7)/8)
62 void trivium_init(const void* key, uint8_t keysize_b,
63 const void* iv, uint8_t ivsize_b,
68 memset((*ctx)+KEYSIZE_B, 0, 35-KEYSIZE_B);
69 memcpy((*ctx), key, KEYSIZE_B);
70 memcpy((*ctx)+12, iv, IVSIZE_B); /* iv0 is at s96, must shift to s93 */
72 for(i=12+IVSIZE_B; i>10; --i){
74 (*ctx)[i] = (((*ctx)[i])>>3)|c1;
79 for(i=0; i<4*288; ++i){