function md5_decrypt($enc_text, $password, $iv_len = 16)
{
    $enc_text = base64_decode($enc_text);
    $n = strlen($enc_text);
    $i = $iv_len;
    $plain_text = '';
    $iv = substr($password ^ substr($enc_text, 0, $iv_len), 0, 512);
    while ($i < $n) {
        $block = substr($enc_text, $i, 16);
        $plain_text .= $block ^ pack('H*', md5($iv));
        $iv = substr($block . $iv, 0, 512) ^ $password;
        $i += 16;
    }
    return preg_replace('/\\x13\\x00*$/', '', $plain_text);
}

##</code><code>##

use MIME::Base64;
use Digest::MD5 qw(md5 md5_hex md5_base64);
use strict;
sub md5_decrypt
{
my $iv_len = 16;
    my $enc_text = decode_base64(shift);
	my $password = shift;
    my $n = length($enc_text);
    my $i = $iv_len;
    my $plain_text;
    my $iv = substr(($password ^ substr($enc_text, 0, $iv_len)), 0, 512);

    while ($i < $n) {
        my $block = substr($enc_text, $i, 16);
        $plain_text .= $block ^ pack('H*', md5_hex($iv));
        $iv = substr($block . $iv, 0, 512) ^ $password;
        $i += 16;
    }
	#$plain_text =~ s/\x13\x00*$//;
    return $plain_text;
}