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/*
* generate_q - 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>
typedef unsigned char byte;
#define ror4(x) (((x) >> 1) | (((x) & 1) << 3))
static byte q0(byte x)
{
static byte t0[16] = { 0x8, 0x1, 0x7, 0xD, 0x6, 0xF, 0x3, 0x2,
0x0, 0xB, 0x5, 0x9, 0xE, 0xC, 0xA, 0x4 };
static byte t1[16] = { 0xE, 0xC, 0xB, 0x8, 0x1, 0x2, 0x3, 0x5,
0xF, 0x4, 0xA, 0x6, 0x7, 0x0, 0x9, 0xD };
static byte t2[16] = { 0xB, 0xA, 0x5, 0xE, 0x6, 0xD, 0x9, 0x0,
0xC, 0x8, 0xF, 0x3, 0x2, 0x4, 0x7, 0x1 };
static byte t3[16] = { 0xD, 0x7, 0xF, 0x4, 0x1, 0x2, 0x6, 0xE,
0x9, 0xB, 0x3, 0x0, 0x8, 0x5, 0xC, 0xA };
byte a0 = x / 16;
byte b0 = x % 16;
byte a1 = a0 ^ b0;
byte b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
byte a2 = t0[a1];
byte b2 = t1[b1];
byte a3 = a2 ^ b2;
byte b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
byte a4 = t2[a3];
byte b4 = t3[b3];
byte y = 16*b4 + a4;
return y;
}
static byte q1(byte x)
{
static byte t0[16] = { 0x2, 0x8, 0xB, 0xD, 0xF, 0x7, 0x6, 0xE,
0x3, 0x1, 0x9, 0x4, 0x0, 0xA, 0xC, 0x5 };
static byte t1[16] = { 0x1, 0xE, 0x2, 0xB, 0x4, 0xC, 0x3, 0x7,
0x6, 0xD, 0xA, 0x5, 0xF, 0x9, 0x0, 0x8 };
static byte t2[16] = { 0x4, 0xC, 0x7, 0x5, 0x1, 0x6, 0x9, 0xA,
0x0, 0xE, 0xD, 0x8, 0x2, 0xB, 0x3, 0xF };
static byte t3[16] = { 0xB, 0x9, 0x5, 0x1, 0xC, 0x3, 0xD, 0xE,
0x6, 0x4, 0x7, 0xF, 0x2, 0x0, 0x8, 0xA };
byte a0 = x / 16;
byte b0 = x % 16;
byte a1 = a0 ^ b0;
byte b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
byte a2 = t0[a1];
byte b2 = t1[b1];
byte a3 = a2 ^ b2;
byte b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
byte a4 = t2[a3];
byte b4 = t3[b3];
byte y = 16*b4 + a4;
return y;
}
int
main(void)
{
int i, j;
printf("static byte q0[] = { ");
for (i = 0; i < 32; i++) {
for (j = 0; j < 8; j++)
printf("0x%02X, ", q0(i*8+j));
if (i == 31)
printf("};\n\n");
else
printf("\n ");
}
printf("static byte q1[] = { ");
for (i = 0; i < 32; i++) {
for (j = 0; j < 8; j++)
printf("0x%02X, ", q1(i*8+j));
if (i == 31)
printf("};\n");
else
printf("\n ");
}
return 0;
}