120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/* threefish512_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 X0 (((uint64_t*)data)[0])
|
|
#define X1 (((uint64_t*)data)[1])
|
|
static
|
|
void mix(void* data, uint8_t rot){
|
|
uint64_t x;
|
|
x = X1;
|
|
X0 += x;
|
|
X1 = ((x<<rot)|(x>>(64-rot))) ^ X0;
|
|
}
|
|
|
|
#define X(a) (((uint64_t*)data)[(a)])
|
|
|
|
static
|
|
void permute_8(void* data){
|
|
uint64_t t;
|
|
t = X(0);
|
|
X(0) = X(2);
|
|
X(2) = X(4);
|
|
X(4) = X(6);
|
|
X(6) = t;
|
|
t = X(3);
|
|
X(3) = X(7);
|
|
X(7) = t;
|
|
}
|
|
/*
|
|
static
|
|
void permute_inv8(void* data){
|
|
uint64_t t;
|
|
t = X(6);
|
|
X(6) = X(4);
|
|
X(4) = X(2);
|
|
X(2) = X(0);
|
|
X(0) = t;
|
|
t = X(7);
|
|
X(7) = X(3);
|
|
X(3) = t;
|
|
}
|
|
*/
|
|
|
|
#define THREEFISH_KEY_CONST 0x5555555555555555LL /* 2**64/3 */
|
|
|
|
#define K(s) (((uint64_t*)key)[(s)])
|
|
#define T(s) (((uint64_t*)tweak)[(s)])
|
|
|
|
void threefish512_init(void* key, void* tweak, threefish512_ctx_t* ctx){
|
|
memcpy(ctx->k, key, 8*8);
|
|
memcpy(ctx->t, tweak, 2*8);
|
|
uint8_t i;
|
|
ctx->k[8] = THREEFISH_KEY_CONST;
|
|
for(i=0; i<8; ++i){
|
|
ctx->k[8] ^= K(i);
|
|
}
|
|
ctx->t[2] = T(0) ^ T(1);
|
|
}
|
|
|
|
static
|
|
void add_key_8(void* data, threefish512_ctx_t* ctx, uint8_t s){
|
|
uint8_t i;
|
|
for(i=0; i<5; ++i){
|
|
X(i) += ctx->k[(s+i)%9];
|
|
}
|
|
X(5) += ctx->k[(s+5)%9] + ctx->t[s%3];
|
|
X(6) += ctx->k[(s+6)%9] + ctx->t[(s+1)%3];
|
|
X(7) += ctx->k[(s+7)%9] + s;
|
|
}
|
|
|
|
void threefish512_enc(void* data, threefish512_ctx_t* ctx){
|
|
uint8_t i=0,s=0;
|
|
uint8_t r0[8] = {38, 48, 34, 26, 33, 39, 29, 33};
|
|
uint8_t r1[8] = {30, 20, 14, 12, 49, 27, 26, 51};
|
|
uint8_t r2[8] = {50, 43, 15, 58, 8, 41, 11, 39};
|
|
uint8_t r3[8] = {53, 31, 27, 7, 42, 14, 9, 35};
|
|
do{
|
|
if(i%4==0){
|
|
add_key_8(data, ctx, s);
|
|
++s;
|
|
}
|
|
mix((uint8_t*)data + 0, r0[i%8]);
|
|
mix((uint8_t*)data + 16, r1[i%8]);
|
|
mix((uint8_t*)data + 32, r2[i%8]);
|
|
mix((uint8_t*)data + 48, r3[i%8]);
|
|
permute_8(data);
|
|
++i;
|
|
}while(i!=72);
|
|
add_key_8(data, ctx, s);
|
|
}
|
|
|