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"
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_8(void* data){
59 void permute_inv8(void* data){
72 #define THREEFISH_KEY_CONST 0x5555555555555555LL /* 2**64/3 */
74 #define K(s) (((uint64_t*)key)[(s)])
75 #define T(s) (((uint64_t*)tweak)[(s)])
77 void threefish512_init(void* key, void* tweak, threefish512_ctx_t* ctx){
78 memcpy(ctx->k, key, 8*8);
79 memcpy(ctx->t, tweak, 2*8);
81 ctx->k[8] = THREEFISH_KEY_CONST;
85 ctx->t[2] = T(0) ^ T(1);
89 void add_key_8(void* data, threefish512_ctx_t* ctx, uint8_t s){
92 X(i) += ctx->k[(s+i)%9];
94 X(5) += ctx->k[(s+5)%9] + ctx->t[s%3];
95 X(6) += ctx->k[(s+6)%9] + ctx->t[(s+1)%3];
96 X(7) += ctx->k[(s+7)%9] + s;
99 void threefish512_enc(void* data, threefish512_ctx_t* ctx){
101 uint8_t r0[8] = {38, 48, 34, 26, 33, 39, 29, 33};
102 uint8_t r1[8] = {30, 20, 14, 12, 49, 27, 26, 51};
103 uint8_t r2[8] = {50, 43, 15, 58, 8, 41, 11, 39};
104 uint8_t r3[8] = {53, 31, 27, 7, 42, 14, 9, 35};
107 add_key_8(data, ctx, s);
110 mix((uint8_t*)data + 0, r0[i%8]);
111 mix((uint8_t*)data + 16, r1[i%8]);
112 mix((uint8_t*)data + 32, r2[i%8]);
113 mix((uint8_t*)data + 48, r3[i%8]);
117 add_key_8(data, ctx, s);