 
<?php 
/** 
* Copyright (c) 2011 - 01 XatuDream 
* XatuDream All Rights Reserved. 
* Support:185390516.qzone.qq.com 
* QQ:185390516 
* Author:Lau Version:1.01 
* Date:2010-08-12 09:28:32 
*/ 
! defined ( 'WORKSPACE' ) && exit ( "Access Denied !" ); 
class MD5Crypt { 
/** 
* Enter description here ... 
* @param unknown_type $str 
* @return string 
*/ 
public final static function mdsha($str) { 
$code = substr ( md5 ( $str ), 10 ); 
$code .= substr ( sha1 ( $str ), 0, 28 ); 
$code .= substr ( md5 ( $str ), 0, 22 ); 
$code .= substr ( sha1 ( $str ), 16 ) . md5 ( $str ); 
return self::chkToken () ? $code : null; 
} 
/** 
* Enter description here ... 
* @param unknown_type $param 
*/ 
private final static function chkToken() { 
return true; 
} 
/** 
* Enter description here ... 
* @param unknown_type $txt 
* @param unknown_type $encrypt_key 
* @return Ambigous <string, boolean> 
*/ 
private final static function keyED($txt, $encrypt_key) { 
$encrypt_key = md5 ( $encrypt_key ); 
$ctr = 0; 
$tmp = ""; 
for($i = 0; $i < strlen ( $txt ); $i ++) { 
if ($ctr == strlen ( $encrypt_key )) 
$ctr = 0; 
$tmp .= substr ( $txt, $i, 1 ) ^ substr ( $encrypt_key, $ctr, 1 ); 
$ctr ++; 
} 
return $tmp; 
} 
/** 
* Enter description here ... 
* @param unknown_type $txt 
* @param unknown_type $key 
* @return string 
*/ 
public final static function Encrypt($txt, $key) { 
srand ( ( double ) microtime () * 1000000 ); 
$encrypt_key = md5 ( rand ( 0, 32000 ) ); 
$ctr = 0; 
$tmp = ""; 
for($i = 0; $i < strlen ( $txt ); $i ++) { 
if ($ctr == strlen ( $encrypt_key )) 
$ctr = 0; 
$tmp .= substr ( $encrypt_key, $ctr, 1 ) . (substr ( $txt, $i, 1 ) ^ substr ( $encrypt_key, $ctr, 1 )); 
$ctr ++; 
} 
$_code = md5 ( $encrypt_key ) . base64_encode ( self::keyED ( $tmp, $key ) ) . md5 ( $encrypt_key . $key ); 
return self::chkToken () ? $_code : null; 
} 
/** 
* Enter description here ... 
* @param unknown_type $txt 
* @param unknown_type $key 
* @return Ambigous <string, boolean> 
*/ 
public final static function Decrypt($txt, $key) { 
$txt = self::keyED ( base64_decode ( substr ( $txt, 32, - 32 ) ), $key ); 
$tmp = ""; 
for($i = 0; $i < strlen ( $txt ); $i ++) { 
$md5 = substr ( $txt, $i, 1 ); 
$i ++; 
$tmp .= (substr ( $txt, $i, 1 ) ^ $md5); 
} 
return self::chkToken () ? $tmp : null; 
} 
/** 
* Enter description here ... 
* @var unknown_type 
*/ 
private static $_key = 'lau'; 
} 
?> 

使用方法：

復(fù)制代碼代碼如下:

 
<?php //Code Start 
/** 
* Copyright (c) 2011 XatuDream 
* XatuDream All Rights Reserved. 
* Support:185390516.qzone.qq.com 
* QQ:185390516 
* Author:LoveCrystal Version:1.01 
* Date:2011-9-2 04:00:37 
*/ 
define ( 'WORKSPACE', '.' . DIRECTORY_SEPARATOR ); 
header ( "Content-Type: text/html; charset=utf-8" ); 
include_once 'Core/Library/MD5Crypt.class.php'; 
$a = MD5Crypt::Encrypt ( "A", 100 ); 
echo "EnCode:" . $a, "<br />"; 
echo "DeCode:" . MD5Crypt::Decrypt ( $a, 100 ); 
?> 