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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., 51 Franklin Street, Fifth Floor, Boston, MA
02111-1301 USA.
*/
#include <stdio.h>
#define ror4(x) (((x) >> 1) | (((x) & 1) << 3))
static unsigned char q0(unsigned char x)
{
static const unsigned char t0[16] = {
0x8, 0x1, 0x7, 0xD, 0x6, 0xF, 0x3, 0x2,
0x0, 0xB, 0x5, 0x9, 0xE, 0xC, 0xA, 0x4
};
static const unsigned char t1[16] = {
0xE, 0xC, 0xB, 0x8, 0x1, 0x2, 0x3, 0x5,
0xF, 0x4, 0xA, 0x6, 0x7, 0x0, 0x9, 0xD
};
static const unsigned char t2[16] = {
0xB, 0xA, 0x5, 0xE, 0x6, 0xD, 0x9, 0x0,
0xC, 0x8, 0xF, 0x3, 0x2, 0x4, 0x7, 0x1
};
static const unsigned char t3[16] = {
0xD, 0x7, 0xF, 0x4, 0x1, 0x2, 0x6, 0xE,
0x9, 0xB, 0x3, 0x0, 0x8, 0x5, 0xC, 0xA
};
unsigned char a0 = x / 16;
unsigned char b0 = x % 16;
unsigned char a1 = a0 ^ b0;
unsigned char b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
unsigned char a2 = t0[a1];
unsigned char b2 = t1[b1];
unsigned char a3 = a2 ^ b2;
unsigned char b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
unsigned char a4 = t2[a3];
unsigned char b4 = t3[b3];
unsigned char y = 16*b4 + a4;
return y;
}
static unsigned char q1(unsigned char x)
{
static const unsigned char t0[16] = {
0x2, 0x8, 0xB, 0xD, 0xF, 0x7, 0x6, 0xE,
0x3, 0x1, 0x9, 0x4, 0x0, 0xA, 0xC, 0x5
};
static const unsigned char t1[16] = {
0x1, 0xE, 0x2, 0xB, 0x4, 0xC, 0x3, 0x7,
0x6, 0xD, 0xA, 0x5, 0xF, 0x9, 0x0, 0x8
};
static const unsigned char t2[16] = {
0x4, 0xC, 0x7, 0x5, 0x1, 0x6, 0x9, 0xA,
0x0, 0xE, 0xD, 0x8, 0x2, 0xB, 0x3, 0xF
};
static const unsigned char t3[16] = {
0xB, 0x9, 0x5, 0x1, 0xC, 0x3, 0xD, 0xE,
0x6, 0x4, 0x7, 0xF, 0x2, 0x0, 0x8, 0xA
};
unsigned char a0 = x / 16;
unsigned char b0 = x % 16;
unsigned char a1 = a0 ^ b0;
unsigned char b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
unsigned char a2 = t0[a1];
unsigned char b2 = t1[b1];
unsigned char a3 = a2 ^ b2;
unsigned char b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
unsigned char a4 = t2[a3];
unsigned char b4 = t3[b3];
unsigned char y = 16*b4 + a4;
return y;
}
int
main(void)
{
unsigned i;
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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