[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)));?>php加密解密处理类
原文地址：http://www.cnblogs.com/ghjbk/p/7519822.html