git.distorted.org.uk Git - u/mdw/catacomb/blob - blowfish-mktab.c

   1 /* -*-c-*-
   2  *
   3  * $Id: blowfish-mktab.c,v 1.2 2000/07/16 12:33:11 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 1.2  2000/07/16 12:33:11  mdw
  34  * Shut stupid compiler up.
  35  *
  36  * Revision 1.1  2000/06/17 10:47:28  mdw
  37  * Emits Blowfish initial key data, derived from the digits of pi.
  38  *
  39  */
  40
  41 /*----- Header files ------------------------------------------------------*/
  42
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45
  46 #include <mLib/bits.h>
  47
  48 /*----- Main code ---------------------------------------------------------*/
  49
  50 /* --- @spigot@ --- *
  51  *
  52  * Arguments:   @uint32 *buf@ = pointer to the output buffer
  53  *              @size_t n@ = number of output digits wanted
  54  *
  55  * Returns:     ---
  56  *
  57  * Use:         Writes digits of %$\pi$% to the given array.  The algorithm
  58  *              is based on the Spigot algorithm by Stanley Rabinowitz and
  59  *              Stan Wagon, published in Amer.Math.Monthly, March 1995, with
  60  *              bug fixes by C. Haenel.  I then bodged it to output hex
  61  *              digits rather than decimal ones, and to leave off the initial
  62  *              `3'.
  63  *
  64  *              I've not analysed the algorithm very much.
  65  */
  66
  67 #define SPIGOT_WORDS (18 + 4 * 256ul)
  68 #define SPIGOT_BITS 8
  69 #define SPIGOT_RADIX (1ul << SPIGOT_BITS)
  70 #define SPIGOT_BUFLEN (SPIGOT_WORDS * 32)
  71
  72 static void spigot(uint32 *buf, size_t n)
  73 {
  74   uint32 acc = 0;
  75   int b = -1;
  76   unsigned a[SPIGOT_BUFLEN] = { 0 };
  77   uint32 p = 0;
  78   unsigned f = 0;
  79   unsigned max = 32 * n;
  80   size_t step = n / 60;
  81
  82   fputs("[                                                             ]\r[",
  83         stderr);
  84
  85 #define EMIT(z) do {                                                    \
  86   if (b == -1)                                                          \
  87     b = 0;                                                              \
  88   else {                                                                \
  89     acc = (acc << SPIGOT_BITS) | (z);                                   \
  90     b += SPIGOT_BITS;                                                   \
  91     if (b == 32) {                                                      \
  92       *buf++ = acc;                                                     \
  93       acc = 0;                                                          \
  94       b = 0;                                                            \
  95       n--;                                                              \
  96       if (!n)                                                           \
  97         goto done;                                                      \
  98       if (n % step == 0)                                                \
  99         fputc('.', stderr);                                             \
 100     }                                                                   \
 101   }                                                                     \
 102 } while (0)
 103
 104   while (n) {
 105     uint32 q = 0;
 106     uint32 i;
 107     uint32 x = 0;
 108     uint32 k = max * 2 - 1;
 109
 110     for (i = max; i; i--) {
 111       x = (b == -1 ? SPIGOT_RADIX * 2 : a[i - 1] << SPIGOT_BITS) + q * i;
 112       q = x / k;
 113       a[i - 1] = x - q * k;
 114       k -= 2;
 115     }
 116
 117     k = x & (SPIGOT_RADIX - 1);
 118     if (k == SPIGOT_RADIX - 1)
 119       f++;
 120     else {
 121       EMIT(p + (x >> SPIGOT_BITS));
 122       if (f) {
 123         unsigned d = (x >= SPIGOT_RADIX ? 0 : SPIGOT_RADIX - 1);
 124         while (f) {
 125           EMIT(d);
 126           f--;
 127         }
 128       }
 129       p = k;
 130     }
 131   }
 132
 133 done:
 134   fputc('\n', stderr);
 135
 136 #undef EMIT
 137 }
 138
 139 /* --- @main@ --- */
 140
 141 int main(void)
 142 {
 143   uint32 dbuf[SPIGOT_WORDS];
 144   int i, j;
 145   uint32 *d = dbuf;
 146
 147   spigot(d, SPIGOT_WORDS);
 148
 149   fputs("\
 150 /* -*-c-*-\n\
 151  *\n\
 152  * Blowfish initial key table [generated]\n\
 153  */\n\
 154 \n\
 155 #ifndef CATACOMB_BLOWFISH_TAB_H\n\
 156 #define CATACOMB_BLOWFISH_TAB_H\n\
 157 \n\
 158 #define BLOWFISH_IKEY {                                                 \\\n\
 159   { ", stdout);
 160
 161   for (i = 0; i < 18; i++) {
 162     printf("0x%08x", *d++);
 163     if (i == 17)
 164       fputs(" },                                                \\\n\
 165                                                                         \\\n\
 166   { ", stdout);
 167     else if (i % 4 == 3)
 168       fputs(",                  \\\n    ", stdout);
 169     else
 170       fputs(", ", stdout);
 171   }
 172
 173   for (j = 0; j < 4; j++) {
 174     for (i = 0; i < 256; i++) {
 175     printf("0x%08x", *d++);
 176     if (i == 255) {
 177       if (j == 3)
 178         fputs(" }                       \\\n}\n\n#endif\n", stdout);
 179       else
 180         fputs(" },                      \\\n\
 181                                                                         \\\n\
 182   { ", stdout);
 183     } else if (i % 4 == 3)
 184       fputs(",                  \\\n    ", stdout);
 185     else
 186       fputs(", ", stdout);
 187     }
 188   }
 189
 190   if (fclose(stdout)) {
 191     fprintf(stderr, "error writing data\n");
 192     exit(EXIT_FAILURE);
 193   }
 194   return (0);
 195 }
 196
 197 /*----- That's all, folks -------------------------------------------------*/