#!/usr/bin/perl
#
# cryptpasswd	Generate or check md5 and DES hashed passwords.
#
#    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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#
#    Copyright (C) 2001 The FreeRADIUS Project   http://www.freeradius.org
#
#    Written by Miquel van Smoorenburg <miquels@cistron-office.nl>
#
#    $Id: dbc0f4f5c52fc88d0c5dd8379571892be3c765ed $
#

use Getopt::Long;

sub check_des {
	return (crypt("fnord", "aa") =~ m/^aa/);
}

sub check_md5 {
	return (crypt("fnord", "\$1\$aa") =~ m/^\$1\$/);
}

sub usage {
	$name = $0;
	$name =~ s,.*/,,;

	die "Usage: $name [--des|--md5|--check] plaintext_password [crypted_password]\n";
}

@saltc = ( '.', '/', '0'..'9', 'A'..'Z', 'a'..'z' );

#
#	MAIN
#
sub main {

	Getopt::Long::Configure("no_ignore_case", "bundling");
	my @options = (	"des|d+", "md5|m+", "check|c+" );
	usage() unless (eval { Getopt::Long::GetOptions(@options) } );

	if ($opt_check) {
		usage unless ($#ARGV == 1);
		if (crypt($ARGV[0], $ARGV[1]) ne $ARGV[1]) {
			print "Password BAD\n";
			return 0;
		} else {
			print "Password OK\n";
			return 1;
		}
	}

	$opt_des = 1 unless ($opt_des || $opt_md5);
	usage() unless ($#ARGV == 0);

	die "DES password hashing not available\n"
		if ($opt_des && !check_des());
	die "MD5 password hashing not available\n"
		if ($opt_md5 && !check_md5());

	$salt = ($opt_md5 ? '$1$' : '');
	for ($i = 0; $i < ($opt_md5 ? 8 : 2); $i++) {
		$salt .= $saltc[rand 64];
	}
	$salt .= '$' if ($opt_md5);
	print crypt($ARGV[0], $salt), "\n";

	1;
}

exit !main();
