cisco-decrypt.c

   1 /* Decoder for password encoding of Cisco VPN client.
   2    Copyright (C) 2005 Maurice Massar
   3
   4    Thanks to HAL-9000@evilscientists.de for decoding and posting the algorithm!
   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 2 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, write to the Free Software
  18    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19 */
  20
  21 #include "decrypt-utils.h"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <gcrypt.h>
  26 #include <errno.h>
  27
  28 int main(int argc, char *argv[])
  29 {
  30         int i, len, ret = 0;
  31         char *bin, *pw = NULL;
  32
  33         gcry_check_version(NULL);
  34
  35         if (argc == 1 || *argv[1] == '-') {
  36                 fprintf(stderr,
  37                         "\nUsage: %s DEADBEEF...012345678 424242...7261\n"
  38                         "    Print decoded result to stdout\n\n",
  39                         argv[0]);
  40                 exit(1);
  41         }
  42         /* Hack for use in pcf2vpnc */
  43         if (*argv[1] == 'q') {
  44                 exit(1);
  45         }
  46
  47         for (i = 1; i < argc; i++) {
  48                 ret = hex2bin(argv[i], &bin, &len);
  49                 if (ret != 0) {
  50                         perror("decoding input");
  51                         continue;
  52                 }
  53                 ret = deobfuscate(bin, len, (const char **)&pw, NULL);
  54                 free(bin);
  55                 if (ret != 0) {
  56                         perror("decrypting input");
  57                         continue;
  58                 }
  59                 printf("%s\n", pw);
  60                 free(pw);
  61         }
  62
  63         exit(ret != 0);
  64 }