glibc/manual/examples/genpass.c

/* Encrypting Passwords
   Copyright (C) 1991-2016 Free Software Foundation, Inc.

   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, if not, see <http://www.gnu.org/licenses/>.
*/

#include <stdio.h>
#include <time.h>
#include <unistd.h>
#include <crypt.h>

int
main(void)
{
  unsigned long seed[2];
  char salt[] = "$1$........";
  const char *const seedchars =
    "./0123456789ABCDEFGHIJKLMNOPQRST"
    "UVWXYZabcdefghijklmnopqrstuvwxyz";
  char *password;
  int i;

  /* Generate a (not very) random seed.
     You should do it better than this...  */
  seed[0] = time(NULL);
  seed[1] = getpid() ^ (seed[0] >> 14 & 0x30000);

  /* Turn it into printable characters from `seedchars'.  */
  for (i = 0; i < 8; i++)
    salt[3+i] = seedchars[(seed[i/5] >> (i%5)*6) & 0x3f];

  /* Read in the user's password and encrypt it.  */
  password = crypt(getpass("Password:"), salt);

  /* Print the results.  */
  puts(password);
  return 0;
}