3 Generates the permutations q0 and q1 for twofish.
5 Copyright (C) 1999 Ruud de Rooij <ruud@debian.org>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
25 #define ror4(x) (((x) >> 1) | (((x) & 1) << 3))
27 static unsigned char q0(unsigned char x)
29 static const unsigned char t0[16] = {
30 0x8, 0x1, 0x7, 0xD, 0x6, 0xF, 0x3, 0x2,
31 0x0, 0xB, 0x5, 0x9, 0xE, 0xC, 0xA, 0x4
33 static const unsigned char t1[16] = {
34 0xE, 0xC, 0xB, 0x8, 0x1, 0x2, 0x3, 0x5,
35 0xF, 0x4, 0xA, 0x6, 0x7, 0x0, 0x9, 0xD
37 static const unsigned char t2[16] = {
38 0xB, 0xA, 0x5, 0xE, 0x6, 0xD, 0x9, 0x0,
39 0xC, 0x8, 0xF, 0x3, 0x2, 0x4, 0x7, 0x1
41 static const unsigned char t3[16] = {
42 0xD, 0x7, 0xF, 0x4, 0x1, 0x2, 0x6, 0xE,
43 0x9, 0xB, 0x3, 0x0, 0x8, 0x5, 0xC, 0xA
46 unsigned char a0 = x / 16;
47 unsigned char b0 = x % 16;
49 unsigned char a1 = a0 ^ b0;
50 unsigned char b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
52 unsigned char a2 = t0[a1];
53 unsigned char b2 = t1[b1];
55 unsigned char a3 = a2 ^ b2;
56 unsigned char b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
58 unsigned char a4 = t2[a3];
59 unsigned char b4 = t3[b3];
61 unsigned char y = 16*b4 + a4;
66 static unsigned char q1(unsigned char x)
68 static const unsigned char t0[16] = {
69 0x2, 0x8, 0xB, 0xD, 0xF, 0x7, 0x6, 0xE,
70 0x3, 0x1, 0x9, 0x4, 0x0, 0xA, 0xC, 0x5
72 static const unsigned char t1[16] = {
73 0x1, 0xE, 0x2, 0xB, 0x4, 0xC, 0x3, 0x7,
74 0x6, 0xD, 0xA, 0x5, 0xF, 0x9, 0x0, 0x8
76 static const unsigned char t2[16] = {
77 0x4, 0xC, 0x7, 0x5, 0x1, 0x6, 0x9, 0xA,
78 0x0, 0xE, 0xD, 0x8, 0x2, 0xB, 0x3, 0xF
80 static const unsigned char t3[16] = {
81 0xB, 0x9, 0x5, 0x1, 0xC, 0x3, 0xD, 0xE,
82 0x6, 0x4, 0x7, 0xF, 0x2, 0x0, 0x8, 0xA
85 unsigned char a0 = x / 16;
86 unsigned char b0 = x % 16;
88 unsigned char a1 = a0 ^ b0;
89 unsigned char b1 = a0 ^ ror4(b0) ^ ((8*a0) % 16);
91 unsigned char a2 = t0[a1];
92 unsigned char b2 = t1[b1];
94 unsigned char a3 = a2 ^ b2;
95 unsigned char b3 = a2 ^ ror4(b2) ^ ((8*a2) % 16);
97 unsigned char a4 = t2[a3];
98 unsigned char b4 = t3[b3];
100 unsigned char y = 16*b4 + a4;
110 printf("static const uint8_t q0[256] = {");
111 for (i = 0; i < 256; i++) {
114 printf("0x%02X,", q0(i));
118 printf("static const uint8_t q1[256] = {");
119 for (i = 0; i < 256; i++) {
122 printf("0x%02X,", q1(i));