1 /* threefish256_enc.c */
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 * \email daniel.otte@rub.de
23 * \license GPLv3 or later
31 #include "threefish.h"
33 #define X(a) (((uint64_t*)data)[(a)])
35 void permute_4(void* data){
42 #define K(s) (((uint64_t*)key)[(s)])
43 #define T(s) (((uint64_t*)tweak)[(s)])
46 void add_key_4(void* data, const threefish256_ctx_t* ctx, uint8_t s){
47 X(0) -= ctx->k[(s+0)%5];
48 X(1) -= ctx->k[(s+1)%5] + ctx->t[s%3];
49 X(2) -= ctx->k[(s+2)%5] + ctx->t[(s+1)%3];
50 X(3) -= ctx->k[(s+3)%5] + s;
53 void threefish256_dec(void* data, const threefish256_ctx_t* ctx){
55 /* old constans, changed at round 2 of the SHA-3 contest
56 uint8_t r0[8] = {59, 11, 53, 26, 58, 13, 36, 5};
57 uint8_t r1[8] = {50, 42, 35, 20, 44, 46, 28, 56};
59 uint8_t r0[8] = { 32, 58, 46, 25, 5, 23, 52, 14};
60 uint8_t r1[8] = { 32, 22, 12, 33, 37, 40, 57, 16};
64 add_key_4(data, ctx, s);
68 threefish_invmix(data, r0[i%8]);
69 threefish_invmix((uint8_t*)data + 16, r1[i%8]);
72 add_key_4(data, ctx, s);