/*
   Copyright (c) 1995-1998 by Cisco systems, Inc.

   Permission to use, copy, modify, and distribute this software for
   any purpose and without fee is hereby granted, provided that this
   copyright and permission notice appear on all copies of the
   software and supporting documentation, the name of Cisco Systems,
   Inc. not be used in advertising or publicity pertaining to
   distribution of the program without specific prior permission, and
   notice be given in supporting documentation that modification,
   copying and distribution is by permission of Cisco Systems, Inc.

   Cisco Systems, Inc. makes no representations about the suitability
   of this software for any purpose.  THIS SOFTWARE IS PROVIDED ``AS
   IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
   WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   FITNESS FOR A PARTICULAR PURPOSE.
*/

/* Program to des encrypt a password like Unix
   It prompts for the password to encrypt.
   You can optionally supply a salt to verify a password.
   Usage: a.out [salt]
*/


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif


#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <string.h>


#ifndef NULL
#define NULL ((void *) 0)
#endif

/* Stolen from pbmplus.h of netpbm: */

#if __STDC__
#define TAC_ARGS(alist) alist
#else /*__STDC__*/
#define TAC_ARGS(alist) ()
#endif /*__STDC__*/


int main TAC_ARGS((int argc, char **argv));

int
main(argc, argv)
int argc;
char **argv;
{
    char pass[25], *salt, buf[24];
    char *result;
    int n;
    char *prompt = "Password to be encrypted: ";

    salt = NULL;

    if (argc == 2) {
	salt = argv[1];
    }

    write(1, prompt, strlen(prompt));
    n = read(0, pass, sizeof(pass));
    pass[n-1] = 0;

    if (!salt) {
	int i, r, r1 = 0 /* GCC paranoia */, r2 = 0 /* GCC paranoia */;

	srand(time(0));

	for(i=0; i <= 1; i++) {

	    r = rand();

	    r = r & 127;

	    if (r < 46)
		r += 46;

	    if (r > 57 && r < 65)
		r += 7;

	    if (r > 90 && r < 97)
		r += 6;

	    if (r > 122)
		r -= 5;

	    if (i == 0)
		r1 = r;

	    if (i == 1)
		r2 = r;
	}

	sprintf(buf, "%c%c", r1, r2);
	salt = buf;
    }

    result = crypt(pass, salt);

    write(1, result, strlen(result));
    write(1, "\n", 1);

    return (EXIT_SUCCESS);
}