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

   1 /* -*-c-*-
   2  *
   3  * Generate tables for SAFER
   4  *
   5  * (c) 2001 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 /*----- Header files ------------------------------------------------------*/
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32
  33 #include <mLib/bits.h>
  34
  35 /*----- Main code ---------------------------------------------------------*/
  36
  37 int main(void)
  38 {
  39   octet s[256], si[256];
  40   unsigned x, i;
  41
  42   x = 1;
  43   for (i = 0; i < 256; i++) {
  44     if (x < 256) {
  45       s[i] = x;
  46       si[x] = i;
  47     }
  48     x = (x * 45)%257;
  49   }
  50   s[128] = 0;
  51   si[0] = 128;
  52
  53   fputs("\
  54 /* -*-c-*-\n\
  55  *\n\
  56  * SAFER tables [generated]\n\
  57  */\n\
  58 \n\
  59 #include <mLib/bits.h>\n\
  60 \n\
  61 ", stdout);
  62
  63   fputs("\
  64 /* --- S-boxes --- */\n\
  65 \n\
  66 const octet safer_s[256] = {\n\
  67   ", stdout);
  68   for (i = 0; i < 256; i++) {
  69     printf("0x%02x", s[i]);
  70     if (i == 255)
  71       fputs("\n};\n\n", stdout);
  72     else if ((i + 1)%8 == 0)
  73       fputs(",\n  ", stdout);
  74     else
  75       fputs(", ", stdout);
  76   }
  77
  78   fputs("\
  79 const octet safer_si[256] = {\n\
  80   ", stdout);
  81   for (i = 0; i < 256; i++) {
  82     printf("0x%02x", si[i]);
  83     if (i == 255)
  84       fputs("\n};\n", stdout);
  85     else if ((i + 1)%8 == 0)
  86       fputs(",\n  ", stdout);
  87     else
  88       fputs(", ", stdout);
  89   }
  90
  91   if (fclose(stdout)) {
  92     fprintf(stderr, "error writing data\n");
  93     exit(EXIT_FAILURE);
  94   }
  95
  96   return (0);
  97 }
  98
  99 /*----- That's all, folks -------------------------------------------------*/