--- /dev/null
+/* threefish1024_enc.c */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2009 Daniel Otte (daniel.otte@rub.de)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+ * \author Daniel Otte
+ * \email daniel.otte@rub.de
+ * \date 2009-03-12
+ * \license GPLv3 or later
+ *
+ *
+ *
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include "threefish.h"
+
+#define X(a) (((uint64_t*)data)[(a)])
+
+static
+void permute_16(void* data){
+ uint64_t t;
+ t = X(1);
+ X(1) = X(9);
+ X(9) = X(7);
+ X(7) = X(15);
+ X(15) = t;
+ t = X(3);
+ X(3) = X(13);
+ X(13) = X(5);
+ X(5) = X(11);
+ X(11) = t;
+ t = X(4);
+ X(4) = X(6);
+ X(6) = t;
+ t = X(8);
+ X(8) = X(10);
+ X(10) = X(12);
+ X(12) = X(14);
+ X(14) = t;
+}
+
+#define THREEFISH_KEY_CONST 0x5555555555555555LL /* 2**64/3 */
+
+#define K(s) (((uint64_t*)key)[(s)])
+#define T(s) (((uint64_t*)tweak)[(s)])
+
+void threefish1024_init(const void* key, const void* tweak, threefish1024_ctx_t* ctx){
+ memcpy(ctx->k, key, 16*8);
+ if(tweak){
+ memcpy(ctx->t, tweak, 2*8);
+ ctx->t[2] = T(0) ^ T(1);
+ }else{
+ memset(ctx, 0, 3*8);
+ }
+ uint8_t i;
+ ctx->k[16] = THREEFISH_KEY_CONST;
+ for(i=0; i<16; ++i){
+ ctx->k[16] ^= K(i);
+ }
+}
+
+static
+void add_key_16(void* data, const threefish1024_ctx_t* ctx, uint8_t s){
+ uint8_t i;
+ for(i=0; i<13; ++i){
+ X(i) += ctx->k[(s+i)%17];
+ }
+ X(13) += ctx->k[(s+13)%17] + ctx->t[s%3];
+ X(14) += ctx->k[(s+14)%17] + ctx->t[(s+1)%3];
+ X(15) += ctx->k[(s+15)%17] + s;
+}
+
+void threefish1024_enc(void* data, const threefish1024_ctx_t* ctx){
+ uint8_t i=0,s=0;
+ uint8_t r0[8] = {55, 25, 33, 34, 28, 17, 58, 47};
+ uint8_t r1[8] = {43, 25, 8, 43, 7, 6, 7, 49};
+ uint8_t r2[8] = {37, 46, 18, 25, 47, 18, 32, 27};
+ uint8_t r3[8] = {40, 13, 57, 60, 48, 25, 45, 58};
+ uint8_t r4[8] = {16, 14, 21, 44, 51, 43, 19, 37};
+ uint8_t r5[8] = {22, 13, 12, 9, 9, 42, 18, 48};
+ uint8_t r6[8] = {38, 52, 32, 59, 35, 40, 2, 53};
+ uint8_t r7[8] = {12, 57, 54, 34, 41, 15, 56, 56};
+
+ do{
+ if(i%4==0){
+ add_key_16(data, ctx, s);
+ ++s;
+ }
+ threefish_mix((uint8_t*)data + 0, r0[i%8]);
+ threefish_mix((uint8_t*)data + 16, r1[i%8]);
+ threefish_mix((uint8_t*)data + 32, r2[i%8]);
+ threefish_mix((uint8_t*)data + 48, r3[i%8]);
+ threefish_mix((uint8_t*)data + 64, r4[i%8]);
+ threefish_mix((uint8_t*)data + 80, r5[i%8]);
+ threefish_mix((uint8_t*)data + 96, r6[i%8]);
+ threefish_mix((uint8_t*)data +112, r7[i%8]);
+ permute_16(data);
+ ++i;
+ }while(i!=80);
+ add_key_16(data, ctx, s);
+}