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/*
* twofishdata.c - Generates the permutations q0 and q1 for twofish.
* Copyright (C) 1999 Ruud de Rooij <ruud@debian.org>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include "nettle-stdint.h"
#define ror4(x) (((x) >> 1) | (((x) & 1) << 3))
static uint8_t q0(uint8_t x)
{
static const uint8_t t0[16] = {
0x8, 0x1, 0x7, 0xD, 0x6, 0xF, 0x3, 0x2,
0x0, 0xB, 0x5, 0x9, 0xE, 0xC, 0xA, 0x4
};
static const uint8_t t1[16] = {
0xE, 0xC, 0xB, 0x8, 0x1, 0x2, 0x3, 0x5,
0xF, 0x4, 0xA, 0x6, 0x7, 0x0, 0x9, 0xD
};
static const uint8_t t2[16] = {
0xB, 0xA, 0x5, 0xE, 0x6, 0xD, 0x9, 0x0,
0xC, 0x8, 0xF, 0x3, 0x2, 0x4, 0x7, 0x1
};
static const uint8_t t3[16] = {
0xD, 0x7, 0xF, 0x4, 0x1, 0x2, 0x6, 0xE,
0x9, 0xB, 0x3, 0x0, 0x8, 0x5, 0xC, 0xA
};
uint8_t a0 = x / 16;
uint8_t b0 = x % 16;
uint8_t a1 = a0 ^ b0;
uint8_t b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
uint8_t a2 = t0[a1];
uint8_t b2 = t1[b1];
uint8_t a3 = a2 ^ b2;
uint8_t b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
uint8_t a4 = t2[a3];
uint8_t b4 = t3[b3];
uint8_t y = 16*b4 + a4;
return y;
}
static uint8_t q1(uint8_t x)
{
static const uint8_t t0[16] = {
0x2, 0x8, 0xB, 0xD, 0xF, 0x7, 0x6, 0xE,
0x3, 0x1, 0x9, 0x4, 0x0, 0xA, 0xC, 0x5
};
static const uint8_t t1[16] = {
0x1, 0xE, 0x2, 0xB, 0x4, 0xC, 0x3, 0x7,
0x6, 0xD, 0xA, 0x5, 0xF, 0x9, 0x0, 0x8
};
static const uint8_t t2[16] = {
0x4, 0xC, 0x7, 0x5, 0x1, 0x6, 0x9, 0xA,
0x0, 0xE, 0xD, 0x8, 0x2, 0xB, 0x3, 0xF
};
static const uint8_t t3[16] = {
0xB, 0x9, 0x5, 0x1, 0xC, 0x3, 0xD, 0xE,
0x6, 0x4, 0x7, 0xF, 0x2, 0x0, 0x8, 0xA
};
uint8_t a0 = x / 16;
uint8_t b0 = x % 16;
uint8_t a1 = a0 ^ b0;
uint8_t b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
uint8_t a2 = t0[a1];
uint8_t b2 = t1[b1];
uint8_t a3 = a2 ^ b2;
uint8_t b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
uint8_t a4 = t2[a3];
uint8_t b4 = t3[b3];
uint8_t y = 16*b4 + a4;
return y;
}
int
main(void)
{
unsigned i, j;
printf("static const uint8_t q0[256] = {");
for (i = 0; i < 256; i++) {
if ( (i % 8) == 0)
printf("\n ");
printf("0x%02X,", q0(i));
}
printf("\n};\n\n");
printf("static const uint8_t q1[256] = {");
for (i = 0; i < 256; i++) {
if ( (i % 8) == 0)
printf("\n ");
printf("0x%02X,", q1(i));
}
printf("\n};\n");
return 0;
}
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