123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/* threefish512_enc.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* \author Daniel Otte
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* \email bg@nerilex.org
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* \date 2009-03-12
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* \license GPLv3 or later
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*
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*
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*
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*/
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#include <stdint.h>
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#include <string.h>
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#include "threefish.h"
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#define X(a) (((uint64_t*)data)[(a)])
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static
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void permute_8(void *data){
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uint64_t t;
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t = X(0);
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X(0) = X(2);
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X(2) = X(4);
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X(4) = X(6);
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X(6) = t;
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t = X(3);
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X(3) = X(7);
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X(7) = t;
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}
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/*
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static
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void permute_inv8(void *data){
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uint64_t t;
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t = X(6);
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X(6) = X(4);
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X(4) = X(2);
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X(2) = X(0);
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X(0) = t;
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t = X(7);
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X(7) = X(3);
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X(3) = t;
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}
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*/
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//#define THREEFISH_KEY_CONST 0x5555555555555555LL /* 2**64/3 */
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#define THREEFISH_KEY_CONST 0x1BD11BDAA9FC1A22LL
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#define K(s) (((uint64_t*)key)[(s)])
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#define T(s) (((uint64_t*)tweak)[(s)])
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void threefish512_init(const void *key, const void *tweak, threefish512_ctx_t *ctx){
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memcpy(ctx->k, key, 8*8);
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if(tweak){
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memcpy(ctx->t, tweak, 2*8);
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ctx->t[2] = T(0) ^ T(1);
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}else{
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memset(ctx->t, 0, 3*8);
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}
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uint8_t i;
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ctx->k[8] = THREEFISH_KEY_CONST;
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for(i=0; i<8; ++i){
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ctx->k[8] ^= K(i);
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}
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}
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static
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void add_key_8(void *data, const threefish512_ctx_t *ctx, uint8_t s){
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uint8_t i;
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for(i=0; i<5; ++i){
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X(i) += ctx->k[(s+i)%9];
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}
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X(5) += ctx->k[(s+5)%9] + ctx->t[s%3];
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X(6) += ctx->k[(s+6)%9] + ctx->t[(s+1)%3];
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X(7) += ctx->k[(s+7)%9] + s;
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}
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void threefish512_enc(void *data, const threefish512_ctx_t *ctx){
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uint8_t i=0,s=0;
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/* old constans, changed at round 2 of the SHA-3 contest
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uint8_t r0[8] = {38, 48, 34, 26, 33, 39, 29, 33};
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uint8_t r1[8] = {30, 20, 14, 12, 49, 27, 26, 51};
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uint8_t r2[8] = {50, 43, 15, 58, 8, 41, 11, 39};
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uint8_t r3[8] = {53, 31, 27, 7, 42, 14, 9, 35};
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*/
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uint8_t r0[8] = {46, 33, 17, 44, 39, 13, 25, 8};
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uint8_t r1[8] = {36, 27, 49, 9, 30, 50, 29, 35};
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uint8_t r2[8] = {19, 14, 36, 54, 34, 10, 39, 56};
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uint8_t r3[8] = {37, 42, 39, 56, 24, 17, 43, 22};
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do{
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if(i%4==0){
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add_key_8(data, ctx, s);
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++s;
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}
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threefish_mix((uint8_t*)data + 0, r0[i%8]);
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threefish_mix((uint8_t*)data + 16, r1[i%8]);
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threefish_mix((uint8_t*)data + 32, r2[i%8]);
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threefish_mix((uint8_t*)data + 48, r3[i%8]);
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permute_8(data);
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++i;
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}while(i!=72);
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add_key_8(data, ctx, s);
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}
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