tinc/src/genauth.c

/*
    genauth.c -- generate a random passphrase
    Copyright (C) 1998,1999,2000 Ivo Timmermans <zarq@iname.com>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: genauth.c,v 1.7 2000/05/31 18:21:27 zarq Exp $
*/

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#include <xalloc.h>

#include "encr.h"

#include "system.h"

unsigned char initvec[] = { 0x22, 0x7b, 0xad, 0x55, 0x41, 0xf4, 0x3e, 0xf3 };

int main(int argc, char **argv)
{
  FILE *fp;
  int bits, c, i, bytes;
  unsigned char *p;

  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  if(argc > 2 || (argc == 2 && (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help"))))
    {
      fprintf(stderr, _("Usage: %s bits\n"), argv[0]);
      return 1;
    }

  if(!argv[1])
    argv[1] = "1024";
  
  if(!(bits = atol(argv[1])))
    {
      fprintf(stderr, _("Illegal number: %s\n"), argv[1]);
      return 1;
    }

  bits = ((bits - 1) | 63) + 1;
  fprintf(stderr, _("Generating %d bits number"), bits);
  bytes = bits >> 3;

  if((fp = fopen("/dev/urandom", "r")) == NULL)
    {
      perror(_("Opening /dev/urandom"));
      return 1;
    }

  p = xmalloc(bytes);

  setbuf(stdout, NULL);
  for(i = 0; i < bytes; i++)
    {
      c = fgetc(fp);
      if(feof(fp))
        {
          puts("");
          fprintf(stderr, _("File was empty!\n"));
        }
      p[i] = c;
    }
  fclose(fp);

  if(isatty(1))
    {
      fprintf(stderr, _(": done.\nThe following line should be ENTIRELY copied into a passphrase file:\n"));
      printf("%d ", bits);
      for(i = 0; i < bytes; i++)
	printf("%02x", p[i]);
      puts("");
    }
  else
    {
      printf("%d ", bits);
      for(i = 0; i < bytes; i++)
	printf("%02x", p[i]);
      puts("");
      fprintf(stderr, _(": done.\n"));
    }

  return 0;
}