host/gf256_table_gen.c

   1 /* gf256_table_gen.c */
   2 /*
   3     This file is part of the AVR-Crypto-Lib.
   4     Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
   5
   6     This program is free software: you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation, either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 /**
  20  * \file     gf256_table_gen.c
  21  * \email    bg@nerilex.org
  22  * \author   Daniel Otte
  23  * \date     2009-01-13
  24  * \license  GPLv3 or later
  25  *
  26  */
  27 #include <stdint.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <getopt.h>
  31 #include "gf256mul.h"
  32
  33 int print_header =  1,
  34     print_braces =  1,
  35     print_base   =  1,
  36     print_align  =  1,
  37     print_prefix =  1;
  38
  39 char *fmt_strings[]={"%d", "%3d",
  40                      "%X", "%2.2X",
  41                      "%o", "%3o",
  42                      "%d", "%3d",
  43                      "0x%X", "0x%2.2X",
  44                      "0%o", "0%3o"};
  45
  46 void print_help(void){
  47         puts(
  48 "gf256_table_gen [-cCbBdhoaApP] [-l min] [-u max]\n"
  49 "                [-f formatstring] [-o file] -r reducer value {values} \n"
  50 "\n"
  51 " -c/-C turn C-header on/off (default: on)\n"
  52 " -b/-B turn braces on/off (defaul: on)\n"
  53 " -d/-h/-8 print values in decimal/hexadecimal/octal (default: hexadecimal)\n"
  54 " -a/-a  turn alignment on/off (default: on)\n"
  55 " -p/-P  turn base prefix on/off (default: on)\n"
  56 " -r reducer reducer is the reduction polynomial represented as numeric value\n"
  57 " -l min starting value for multiplication table (default: 0)\n"
  58 " -u max upper limit value for multiplication table (default: 255)\n"
  59 " -f formatstring string for formating the output of a singel multiplicxation\n"
  60 " -o file outputfile\n"
  61 );
  62 }
  63
  64 int main(int argc, char** argv){
  65         int i,j;
  66         int c;
  67         int option_index=0;
  68         char *fmt=NULL;
  69         static struct option long_options[] =
  70              {
  71                /* These options set a flag. */
  72                {"print-header",    no_argument, &print_header, 1},
  73                {"no-print-header", no_argument, &print_header, 0},
  74                {"print-braces",    no_argument, &print_braces, 1},
  75                {"no-print-braces", no_argument, &print_braces, 0},
  76                {"print-dec",       no_argument, &print_base, 0},
  77                {"print-hex",       no_argument, &print_base, 1},
  78                {"print-octal",     no_argument, &print_base, 2},
  79                {"align",           no_argument, &print_align, 1},
  80                {"no-align",        no_argument, &print_align, 0},
  81                {"print-prefix",    no_argument, &print_prefix, 1},
  82                {"no-print-prefix", no_argument, &print_prefix, 0},
  83
  84                /* These options don't set a flag.
  85                   We distinguish them by their indices. */
  86                {"help",    no_argument      , 0, '?'},
  87                {"reducer", required_argument, 0, 'r'},
  88                {"min",     required_argument, 0, 'l'},
  89                {"max",     required_argument, 0, 'u'},
  90                {"format",  required_argument, 0, 'f'},
  91                {0, 0, 0, 0}
  92              };
  93
  94
  95
  96         unsigned long ul_a;
  97         int columns=8;
  98         unsigned long ul_reducer=0x00, max=0xff, min=0x00;
  99         uint8_t reducer, a;
 100         char** eptr;
 101         FILE *of = stdout;
 102         while(c!=-1){
 103                 c = getopt_long(argc, argv,"cCbBdh8aApPr:l:u:f:",
 104                                 long_options, &option_index);
 105                 switch(c){
 106                         case 'c': print_header=1; break;
 107                         case 'C': print_header=0; break;
 108                         case 'b': print_braces=1; break;
 109                         case 'B': print_braces=0; break;
 110                         case 'h': print_base = 1; break;
 111                         case 'd': print_base = 0; break;
 112                         case '8': print_base = 2; break;
 113                         case 'a': print_align =1; break;
 114                         case 'A': print_align =0; break;
 115                         case 'p': print_prefix=1; break;
 116                         case 'P': print_prefix=0; break;
 117                         case 'r': ul_reducer = strtoul(optarg, eptr, 0);
 118                                   if((**eptr)!='\0'){
 119                                              fprintf(stderr, "Error, invalid reducer value \"%s\"!\n",
 120                                                      optarg);
 121                                              return -1;
 122                                           }
 123                                           break;
 124                         case 'l': min = strtoul(optarg, eptr, 0);
 125                                   if(((**eptr)!='\0')||min>0xff){
 126                                              fprintf(stderr, "Error, invalid minimum value \"%s\"!\n",
 127                                                      optarg);
 128                                              return -1;
 129                                           }
 130                                           break;
 131                         case 'u': max = strtoul(optarg, eptr, 0);
 132                                   if(((**eptr)!='\0')||max>0xff){
 133                                              fprintf(stderr, "Error, invalid maximum value \"%s\"!\n",
 134                                                      optarg);
 135                                              return -1;
 136                                           }
 137                                           break;
 138                         case 'f': fmt = optarg; break;
 139                         case  -1: break;
 140                         case '?':
 141                         default:
 142                                 printf ("unknown option '%c' (%2.2X) !\n\t", c, c);
 143                                 print_help();
 144                                 return 0;
 145                                 break;
 146                 }
 147         }
 148         if(!(reducer = ul_reducer&0xff)){
 149                         fprintf(stderr, "You must specify a reductionpolynomial!\n", argv[i]);
 150                         return -1;
 151         }
 152         if(!fmt)
 153                 fmt = fmt_strings[print_prefix*6+print_base*2+print_align];
 154
 155         for(i=optind; i<argc; ++i){
 156                 ul_a=strtoul(argv[i], eptr, 0)&0xff;
 157                 if(((**eptr)!='\0')|| ul_a>0xff){
 158                         fprintf(stderr, "Error, invalid number \"%s\"!\n", argv[i]);
 159                         return -1;
 160                 }
 161                 a = ul_a;
 162                 if(print_header)
 163                         fprintf(of,"\nuint8_t lut_gfmul_%s_%2.2x",argv[i],reducer);
 164                 if(print_braces)
 165                         fprintf(of," = {\n\t");
 166
 167                 for(j=min; j<=max-1; ++j){
 168                         fprintf(of,fmt,gf256mul(a, j, reducer));
 169                         if(j%columns==columns-1){
 170                                 fprintf(of, ",\n\t");
 171                         }else{
 172                                 fprintf(of, ", ");
 173                         }
 174                 }
 175                 fprintf(of, fmt, gf256mul(a,max, reducer));
 176                 if(print_braces)
 177                         fprintf(of, " }");
 178                 fprintf(of, "\n\n");
 179         }
 180         return 0;
 181 }