1 /* threefish512_enc.c */
3 This file is part of the AVR-Crypto-Lib.
4 Copyright (C) 2009 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 * \email daniel.otte@rub.de
23 * \license GPLv3 or later
31 #include "threefish.h"
34 #define X(a) (((uint64_t*)data)[(a)])
38 void permute_8(void *data){
51 void permute_inv8(void *data){
64 //#define THREEFISH_KEY_CONST 0x5555555555555555LL /* 2**64/3 */
65 #define THREEFISH_KEY_CONST 0x1BD11BDAA9FC1A22LL
67 #define K(s) (((uint64_t*)key)[(s)])
68 #define T(s) (((uint64_t*)tweak)[(s)])
70 void threefish512_init(const void *key, const void *tweak, threefish512_ctx_t *ctx){
71 memcpy(ctx->k, key, 8*8);
73 memcpy(ctx->t, tweak, 2*8);
74 ctx->t[2] = T(0) ^ T(1);
76 memset(ctx->t, 0, 3*8);
79 ctx->k[8] = THREEFISH_KEY_CONST;
86 void add_key_8(void *data, const threefish512_ctx_t *ctx, uint8_t s){
89 X(i) += ctx->k[(s+i)%9];
91 X(5) += ctx->k[(s+5)%9] + ctx->t[s%3];
92 X(6) += ctx->k[(s+6)%9] + ctx->t[(s+1)%3];
93 X(7) += ctx->k[(s+7)%9] + s;
96 void threefish512_enc(void *data, const threefish512_ctx_t *ctx){
98 /* old constans, changed at round 2 of the SHA-3 contest
99 uint8_t r0[8] = {38, 48, 34, 26, 33, 39, 29, 33};
100 uint8_t r1[8] = {30, 20, 14, 12, 49, 27, 26, 51};
101 uint8_t r2[8] = {50, 43, 15, 58, 8, 41, 11, 39};
102 uint8_t r3[8] = {53, 31, 27, 7, 42, 14, 9, 35};
104 uint8_t r0[8] = {46, 33, 17, 44, 39, 13, 25, 8};
105 uint8_t r1[8] = {36, 27, 49, 9, 30, 50, 29, 35};
106 uint8_t r2[8] = {19, 14, 36, 54, 34, 10, 39, 56};
107 uint8_t r3[8] = {37, 42, 39, 56, 24, 17, 43, 22};
110 add_key_8(data, ctx, s);
113 threefish_mix((uint8_t*)data + 0, r0[i%8]);
114 threefish_mix((uint8_t*)data + 16, r1[i%8]);
115 threefish_mix((uint8_t*)data + 32, r2[i%8]);
116 threefish_mix((uint8_t*)data + 48, r3[i%8]);
120 add_key_8(data, ctx, s);