97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* 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_inv16(void* data){
|
|
uint64_t t;
|
|
t = X(15);
|
|
X(15) = X(7);
|
|
X(7) = X(9);
|
|
X(9) = X(1);
|
|
X(1) = t;
|
|
t = X(11);
|
|
X(11) = X(5);
|
|
X(5) = X(13);
|
|
X(13) = X(3);
|
|
X(3) = t;
|
|
t = X(4);
|
|
X(4) = X(6);
|
|
X(6) = t;
|
|
t = X(14);
|
|
X(14) = X(12);
|
|
X(12) = X(10);
|
|
X(10) = X(8);
|
|
X(8) = t;
|
|
}
|
|
|
|
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_dec(void* data, const threefish1024_ctx_t* ctx){
|
|
uint8_t i=0,s=20;
|
|
uint8_t r0[8] = {47, 58, 17, 28, 34, 33, 25, 55};
|
|
uint8_t r1[8] = {49, 7, 6, 7, 43, 8, 25, 43};
|
|
uint8_t r2[8] = {27, 32, 18, 47, 25, 18, 46, 37};
|
|
uint8_t r3[8] = {58, 45, 25, 48, 60, 57, 13, 40};
|
|
uint8_t r4[8] = {37, 19, 43, 51, 44, 21, 14, 16};
|
|
uint8_t r5[8] = {48, 18, 42, 9, 9, 12, 13, 22};
|
|
uint8_t r6[8] = {53, 2, 40, 35, 59, 32, 52, 38};
|
|
uint8_t r7[8] = {56, 56, 15, 41, 34, 54, 57, 12};
|
|
do{
|
|
if(i%4==0){
|
|
add_key_16(data, ctx, s);
|
|
--s;
|
|
}
|
|
permute_inv16(data);
|
|
threefish_invmix((uint8_t*)data + 0, r0[i%8]);
|
|
threefish_invmix((uint8_t*)data + 16, r1[i%8]);
|
|
threefish_invmix((uint8_t*)data + 32, r2[i%8]);
|
|
threefish_invmix((uint8_t*)data + 48, r3[i%8]);
|
|
threefish_invmix((uint8_t*)data + 64, r4[i%8]);
|
|
threefish_invmix((uint8_t*)data + 80, r5[i%8]);
|
|
threefish_invmix((uint8_t*)data + 96, r6[i%8]);
|
|
threefish_invmix((uint8_t*)data +112, r7[i%8]);
|
|
++i;
|
|
}while(i!=80);
|
|
add_key_16(data, ctx, s);
|
|
}
|