| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: blowfish-mktab.c,v 1.1 2000/06/17 10:47:28 mdw Exp $ |
| 4 | * |
| 5 | * Build Blowfish key table |
| 6 | * |
| 7 | * (c) 2000 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: blowfish-mktab.c,v $ |
| 33 | * Revision 1.1 2000/06/17 10:47:28 mdw |
| 34 | * Emits Blowfish initial key data, derived from the digits of pi. |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | /*----- Header files ------------------------------------------------------*/ |
| 39 | |
| 40 | #include <stdio.h> |
| 41 | #include <stdlib.h> |
| 42 | |
| 43 | #include <mLib/bits.h> |
| 44 | |
| 45 | /*----- Main code ---------------------------------------------------------*/ |
| 46 | |
| 47 | /* --- @spigot@ --- * |
| 48 | * |
| 49 | * Arguments: @uint32 *buf@ = pointer to the output buffer |
| 50 | * @size_t n@ = number of output digits wanted |
| 51 | * |
| 52 | * Returns: --- |
| 53 | * |
| 54 | * Use: Writes digits of %$\pi$% to the given array. The algorithm |
| 55 | * is based on the Spigot algorithm by Stanley Rabinowitz and |
| 56 | * Stan Wagon, published in Amer.Math.Monthly, March 1995, with |
| 57 | * bug fixes by C. Haenel. I then bodged it to output hex |
| 58 | * digits rather than decimal ones, and to leave off the initial |
| 59 | * `3'. |
| 60 | * |
| 61 | * I've not analysed the algorithm very much. |
| 62 | */ |
| 63 | |
| 64 | #define SPIGOT_WORDS (18 + 4 * 256ul) |
| 65 | #define SPIGOT_BITS 8 |
| 66 | #define SPIGOT_RADIX (1ul << SPIGOT_BITS) |
| 67 | #define SPIGOT_BUFLEN (SPIGOT_WORDS * 32) |
| 68 | |
| 69 | static void spigot(uint32 *buf, size_t n) |
| 70 | { |
| 71 | uint32 acc = 0; |
| 72 | int b = -1; |
| 73 | unsigned a[SPIGOT_BUFLEN] = { 0 }; |
| 74 | uint32 p = 0; |
| 75 | unsigned f = 0; |
| 76 | unsigned max = 32 * n; |
| 77 | size_t step = n / 60; |
| 78 | |
| 79 | fputs("[ ]\r[", |
| 80 | stderr); |
| 81 | |
| 82 | #define EMIT(z) do { \ |
| 83 | if (b == -1) \ |
| 84 | b = 0; \ |
| 85 | else { \ |
| 86 | acc = (acc << SPIGOT_BITS) | (z); \ |
| 87 | b += SPIGOT_BITS; \ |
| 88 | if (b == 32) { \ |
| 89 | *buf++ = acc; \ |
| 90 | acc = 0; \ |
| 91 | b = 0; \ |
| 92 | n--; \ |
| 93 | if (!n) \ |
| 94 | goto done; \ |
| 95 | if (n % step == 0) \ |
| 96 | fputc('.', stderr); \ |
| 97 | } \ |
| 98 | } \ |
| 99 | } while (0) |
| 100 | |
| 101 | while (n) { |
| 102 | uint32 q = 0; |
| 103 | uint32 i; |
| 104 | uint32 x; |
| 105 | uint32 k = max * 2 - 1; |
| 106 | |
| 107 | for (i = max; i; i--) { |
| 108 | x = (b == -1 ? SPIGOT_RADIX * 2 : a[i - 1] << SPIGOT_BITS) + q * i; |
| 109 | q = x / k; |
| 110 | a[i - 1] = x - q * k; |
| 111 | k -= 2; |
| 112 | } |
| 113 | |
| 114 | k = x & (SPIGOT_RADIX - 1); |
| 115 | if (k == SPIGOT_RADIX - 1) |
| 116 | f++; |
| 117 | else { |
| 118 | EMIT(p + (x >> SPIGOT_BITS)); |
| 119 | if (f) { |
| 120 | unsigned d = (x >= SPIGOT_RADIX ? 0 : SPIGOT_RADIX - 1); |
| 121 | while (f) { |
| 122 | EMIT(d); |
| 123 | f--; |
| 124 | } |
| 125 | } |
| 126 | p = k; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | done: |
| 131 | fputc('\n', stderr); |
| 132 | |
| 133 | #undef EMIT |
| 134 | } |
| 135 | |
| 136 | /* --- @main@ --- */ |
| 137 | |
| 138 | int main(void) |
| 139 | { |
| 140 | uint32 dbuf[SPIGOT_WORDS]; |
| 141 | int i, j; |
| 142 | uint32 *d = dbuf; |
| 143 | |
| 144 | spigot(d, SPIGOT_WORDS); |
| 145 | |
| 146 | fputs("\ |
| 147 | /* -*-c-*-\n\ |
| 148 | *\n\ |
| 149 | * Blowfish initial key table [generated]\n\ |
| 150 | */\n\ |
| 151 | \n\ |
| 152 | #ifndef CATACOMB_BLOWFISH_TAB_H\n\ |
| 153 | #define CATACOMB_BLOWFISH_TAB_H\n\ |
| 154 | \n\ |
| 155 | #define BLOWFISH_IKEY { \\\n\ |
| 156 | { ", stdout); |
| 157 | |
| 158 | for (i = 0; i < 18; i++) { |
| 159 | printf("0x%08x", *d++); |
| 160 | if (i == 17) |
| 161 | fputs(" }, \\\n\ |
| 162 | \\\n\ |
| 163 | { ", stdout); |
| 164 | else if (i % 4 == 3) |
| 165 | fputs(", \\\n ", stdout); |
| 166 | else |
| 167 | fputs(", ", stdout); |
| 168 | } |
| 169 | |
| 170 | for (j = 0; j < 4; j++) { |
| 171 | for (i = 0; i < 256; i++) { |
| 172 | printf("0x%08x", *d++); |
| 173 | if (i == 255) { |
| 174 | if (j == 3) |
| 175 | fputs(" } \\\n}\n\n#endif\n", stdout); |
| 176 | else |
| 177 | fputs(" }, \\\n\ |
| 178 | \\\n\ |
| 179 | { ", stdout); |
| 180 | } else if (i % 4 == 3) |
| 181 | fputs(", \\\n ", stdout); |
| 182 | else |
| 183 | fputs(", ", stdout); |
| 184 | } |
| 185 | } |
| 186 | |
| 187 | if (fclose(stdout)) { |
| 188 | fprintf(stderr, "error writing data\n"); |
| 189 | exit(EXIT_FAILURE); |
| 190 | } |
| 191 | return (0); |
| 192 | } |
| 193 | |
| 194 | /*----- That's all, folks -------------------------------------------------*/ |