twofishdata.c 3.05 KB
 Niels Möller committed Feb 27, 2012 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 ``````/* * twofishdata.c - Generates the permutations q0 and q1 for twofish. * Copyright (C) 1999 Ruud de Rooij * * 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 #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; }``````