glibc/manual/examples/testpass.c

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

int 
main(void)
{
  /* Hashed form of "GNU libc manual".  */
  const char *const pass = "$1$/iSaq7rB$EoUw5jJPPvAPECNaaWzMK/";

  char *result;
  int ok;
  
/*@group*/
  /* Read in the user's password and encrypt it,
     passing the expected password in as the salt.  */
  result = crypt(getpass("Password:"), pass);
/*@end group*/

  /* Test the result.  */
  ok = strcmp (result, pass) == 0;

  puts(ok ? "Access granted." : "Access denied.");
  return ok ? 0 : 1;
}