manual/examples/testpass.c

   1 /* Verify a password.
   2    Copyright (C) 1991-2015 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU General Public License
   6    as published by the Free Software Foundation; either version 2
   7    of the License, or (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 #include <stdio.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21 #include <crypt.h>
  22
  23 int
  24 main(void)
  25 {
  26   /* Hashed form of "GNU libc manual".  */
  27   const char *const pass = "$1$/iSaq7rB$EoUw5jJPPvAPECNaaWzMK/";
  28
  29   char *result;
  30   int ok;
  31
  32 /*@group*/
  33   /* Read in the user's password and encrypt it,
  34      passing the expected password in as the salt.  */
  35   result = crypt(getpass("Password:"), pass);
  36 /*@end group*/
  37
  38   /* Test the result.  */
  39   ok = strcmp (result, pass) == 0;
  40
  41   puts(ok ? "Access granted." : "Access denied.");
  42   return ok ? 0 : 1;
  43 }