98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/* threefish1024_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_inv16(void *data){
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uint64_t t;
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t = X(15);
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X(15) = X(7);
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X(7) = X(9);
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X(9) = X(1);
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X(1) = t;
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t = X(11);
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X(11) = X(5);
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X(5) = X(13);
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X(13) = X(3);
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X(3) = t;
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t = X(4);
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X(4) = X(6);
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X(6) = t;
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t = X(14);
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X(14) = X(12);
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X(12) = X(10);
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X(10) = X(8);
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X(8) = t;
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}
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static
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void add_key_16(void *data, const threefish1024_ctx_t *ctx, uint8_t s){
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uint8_t i;
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for(i=0; i<13; ++i){
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X(i) -= ctx->k[(s+i)%17];
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}
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X(13) -= ctx->k[(s+13)%17] + ctx->t[s%3];
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X(14) -= ctx->k[(s+14)%17] + ctx->t[(s+1)%3];
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X(15) -= ctx->k[(s+15)%17] + s;
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}
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void threefish1024_dec(void *data, const threefish1024_ctx_t *ctx){
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uint8_t i=0,s=20;
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uint8_t r0[8] = {0x69, 0x72, 0x21, 0x34, 0x42, 0x41, 0x31, 0x79};
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uint8_t r1[8] = {0x61, 0x19, 0x1a, 0x19, 0x53, 0x10, 0x31, 0x53};
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uint8_t r2[8] = {0x33, 0x40, 0x22, 0x69, 0x31, 0x22, 0x6a, 0x5b};
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uint8_t r3[8] = {0x72, 0x6b, 0x31, 0x60, 0x74, 0x71, 0x2b, 0x50};
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uint8_t r4[8] = {0x5b, 0x23, 0x53, 0x63, 0x54, 0x3b, 0x2a, 0x20};
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uint8_t r5[8] = {0x60, 0x22, 0x52, 0x11, 0x11, 0x14, 0x2b, 0x3a};
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uint8_t r6[8] = {0x7b, 0x02, 0x50, 0x43, 0x73, 0x40, 0x64, 0x5a};
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uint8_t r7[8] = {0x70, 0x70, 0x29, 0x51, 0x42, 0x7a, 0x71, 0x14};
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do{
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if(i%4==0){
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add_key_16(data, ctx, s);
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--s;
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}
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permute_inv16(data);
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threefish_invmix((uint8_t*)data + 0, r0[i%8]);
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threefish_invmix((uint8_t*)data + 16, r1[i%8]);
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threefish_invmix((uint8_t*)data + 32, r2[i%8]);
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threefish_invmix((uint8_t*)data + 48, r3[i%8]);
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threefish_invmix((uint8_t*)data + 64, r4[i%8]);
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threefish_invmix((uint8_t*)data + 80, r5[i%8]);
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threefish_invmix((uint8_t*)data + 96, r6[i%8]);
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threefish_invmix((uint8_t*)data +112, r7[i%8]);
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++i;
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}while(i!=80);
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add_key_16(data, ctx, s);
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}
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