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 X0 (((uint64_t*)data)[0])
34 #define X1 (((uint64_t*)data)[1])
36 void mix(void* data, uint8_t rot){
40 X1 = ((x<<rot)|(x>>(64-rot))) ^ X0;
43 #define X(a) (((uint64_t*)data)[(a)])
46 void permute_16(void* data){
68 #define THREEFISH_KEY_CONST 0x5555555555555555LL /* 2**64/3 */
70 #define K(s) (((uint64_t*)key)[(s)])
71 #define T(s) (((uint64_t*)tweak)[(s)])
73 void threefish1024_init(void* key, void* tweak, threefish1024_ctx_t* ctx){
74 memcpy(ctx->k, key, 16*8);
75 memcpy(ctx->t, tweak, 2*8);
77 ctx->k[16] = THREEFISH_KEY_CONST;
81 ctx->t[2] = T(0) ^ T(1);
85 void add_key_16(void* data, threefish1024_ctx_t* ctx, uint8_t s){
88 X(i) += ctx->k[(s+i)%17];
90 X(13) += ctx->k[(s+13)%17] + ctx->t[s%3];
91 X(14) += ctx->k[(s+14)%17] + ctx->t[(s+1)%3];
92 X(15) += ctx->k[(s+15)%17] + s;
95 void threefish1024_enc(void* data, threefish1024_ctx_t* ctx){
97 uint8_t r0[8] = {55, 25, 33, 34, 28, 17, 58, 47};
98 uint8_t r1[8] = {43, 25, 8, 43, 7, 6, 7, 49};
99 uint8_t r2[8] = {37, 46, 18, 25, 47, 18, 32, 27};
100 uint8_t r3[8] = {40, 13, 57, 60, 48, 25, 45, 58};
101 uint8_t r4[8] = {16, 14, 21, 44, 51, 43, 19, 37};
102 uint8_t r5[8] = {22, 13, 12, 9, 9, 42, 18, 48};
103 uint8_t r6[8] = {38, 52, 32, 59, 35, 40, 2, 53};
104 uint8_t r7[8] = {12, 57, 54, 34, 41, 15, 56, 56};
108 add_key_16(data, ctx, s);
111 mix((uint8_t*)data + 0, r0[i%8]);
112 mix((uint8_t*)data + 16, r1[i%8]);
113 mix((uint8_t*)data + 32, r2[i%8]);
114 mix((uint8_t*)data + 48, r3[i%8]);
115 mix((uint8_t*)data + 64, r4[i%8]);
116 mix((uint8_t*)data + 80, r5[i%8]);
117 mix((uint8_t*)data + 96, r6[i%8]);
118 mix((uint8_t*)data +112, r7[i%8]);
122 add_key_16(data, ctx, s);