1 /* threefish1024_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"
33 #define X(a) (((uint64_t*)data)[(a)])
36 void permute_inv16(void* data){
59 void add_key_16(void* data, const threefish1024_ctx_t* ctx, uint8_t s){
62 X(i) -= ctx->k[(s+i)%17];
64 X(13) -= ctx->k[(s+13)%17] + ctx->t[s%3];
65 X(14) -= ctx->k[(s+14)%17] + ctx->t[(s+1)%3];
66 X(15) -= ctx->k[(s+15)%17] + s;
69 void threefish1024_dec(void* data, const threefish1024_ctx_t* ctx){
71 uint8_t r0[8] = {47, 58, 17, 28, 34, 33, 25, 55};
72 uint8_t r1[8] = {49, 7, 6, 7, 43, 8, 25, 43};
73 uint8_t r2[8] = {27, 32, 18, 47, 25, 18, 46, 37};
74 uint8_t r3[8] = {58, 45, 25, 48, 60, 57, 13, 40};
75 uint8_t r4[8] = {37, 19, 43, 51, 44, 21, 14, 16};
76 uint8_t r5[8] = {48, 18, 42, 9, 9, 12, 13, 22};
77 uint8_t r6[8] = {53, 2, 40, 35, 59, 32, 52, 38};
78 uint8_t r7[8] = {56, 56, 15, 41, 34, 54, 57, 12};
81 add_key_16(data, ctx, s);
85 threefish_invmix((uint8_t*)data + 0, r0[i%8]);
86 threefish_invmix((uint8_t*)data + 16, r1[i%8]);
87 threefish_invmix((uint8_t*)data + 32, r2[i%8]);
88 threefish_invmix((uint8_t*)data + 48, r3[i%8]);
89 threefish_invmix((uint8_t*)data + 64, r4[i%8]);
90 threefish_invmix((uint8_t*)data + 80, r5[i%8]);
91 threefish_invmix((uint8_t*)data + 96, r6[i%8]);
92 threefish_invmix((uint8_t*)data +112, r7[i%8]);
95 add_key_16(data, ctx, s);