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

   1 /* -*-c-*-
   2  *
   3  * $Id: safer-mktab.c,v 1.2 2004/04/08 01:36:15 mdw Exp $
   4  *
   5  * Generate tables for SAFER
   6  *
   7  * (c) 2001 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 /*----- Header files ------------------------------------------------------*/
  31
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34
  35 #include <mLib/bits.h>
  36
  37 /*----- Main code ---------------------------------------------------------*/
  38
  39 int main(void)
  40 {
  41   octet s[256], si[256];
  42   unsigned x, i;
  43
  44   x = 1;
  45   for (i = 0; i < 256; i++) {
  46     if (x < 256) {
  47       s[i] = x;
  48       si[x] = i;
  49     }
  50     x = (x * 45)%257;
  51   }
  52   s[128] = 0;
  53   si[0] = 128;
  54
  55   fputs("\
  56 /* -*-c-*-\n\
  57  *\n\
  58  * SAFER tables [generated]\n\
  59  */\n\
  60 \n\
  61 #ifndef CATACOMB_SAFER_TAB_H\n\
  62 #define CATACOMB_SAFER_TAB_H\n\
  63 \n\
  64 ", stdout);
  65
  66   fputs("\
  67 /* --- S-boxes --- */\n\
  68 \n\
  69 #define SAFER_S {                                                       \\\n\
  70   ", stdout);
  71   for (i = 0; i < 256; i++) {
  72     printf("0x%02x", s[i]);
  73     if (i == 255)
  74       fputs("                   \\\n}\n\n", stdout);
  75     else if ((i + 1)%8 == 0)
  76       fputs(",                  \\\n  ", stdout);
  77     else
  78       fputs(", ", stdout);
  79   }
  80
  81   fputs("\
  82 #define SAFER_SI {                                                      \\\n\
  83   ", stdout);
  84   for (i = 0; i < 256; i++) {
  85     printf("0x%02x", si[i]);
  86     if (i == 255)
  87       fputs("                   \\\n}\n\n", stdout);
  88     else if ((i + 1)%8 == 0)
  89       fputs(",                  \\\n  ", stdout);
  90     else
  91       fputs(", ", stdout);
  92   }
  93
  94   puts("#endif");
  95
  96   if (fclose(stdout)) {
  97     fprintf(stderr, "error writing data\n");
  98     exit(EXIT_FAILURE);
  99   }
 100
 101   return (0);
 102 }
 103
 104 /*----- That's all, folks -------------------------------------------------*/