[PHP]代码

<?php

/*===========================================================

= 版权协议：

= GPL (The GNU GENERAL PUBLIC LICENSE Version 2, June 1991)

=------------------------------------------------------------

= 文件名称：cls.sys_crypt.php

= 摘    要：php加密解密处理类

= 版    本：1.0

= 参    考：Discuz论坛的passport相关函数

=------------------------------------------------------------

= Script Written By PHPWMS项目组

= 最后更新：xinge

= 最后日期：2007-12-09

============================================================*/

class SysCrypt {

private $crypt_key;

// 构造函数

public function __construct($crypt_key) {

   $this -> crypt_key = $crypt_key;

}

public function php_encrypt($txt) {

   srand((double)microtime() * 1000000);

   $encrypt_key = md5(rand(0,32000));

   $ctr = 0;

   $tmp = '';

   for($i = 0;$i<strlen($txt);$i++) {

    $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;

    $tmp .= $encrypt_key[$ctr].($txt[$i]^$encrypt_key[$ctr++]);

   }

   return base64_encode(self::__key($tmp,$this -> crypt_key));

}

public function php_decrypt($txt) {

   $txt = self::__key(base64_decode($txt),$this -> crypt_key);

   $tmp = '';

   for($i = 0;$i < strlen($txt); $i++) {

    $md5 = $txt[$i];

    $tmp .= $txt[++$i] ^ $md5;

   }

   return $tmp;

}

private function __key($txt,$encrypt_key) {

   $encrypt_key = md5($encrypt_key);

   $ctr = 0;

   $tmp = '';

   for($i = 0; $i < strlen($txt); $i++) {

    $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;

    $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];

   }

   return $tmp;

}

public function __destruct() {

   $this -> crypt_key = null;

}

}

$sc = new SysCrypt('phpwms');

$text = '110';

print($sc -> php_encrypt($text));

print('<br>');

print($sc -> php_decrypt($sc -> php_encrypt($text)));

?>