<?php
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/*===========================================================
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= 版权协议：
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= GPL (The GNU GENERAL PUBLIC LICENSE Version 2, June 1991)
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=------------------------------------------------------------
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= 文件名称：cls.sys_crypt.php
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= 摘要：php加密解密处理类
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= 版本：1.0
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= 参考：Discuz论坛的passport相关函数
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=------------------------------------------------------------
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= Script Written By PHPWMS项目组
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= 最后更新：xinge
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= 最后日期：2007-12-09
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============================================================*/
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class SysCrypt {
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private $crypt_key;
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// 构造函数
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public function __construct($crypt_key) {
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$this -> crypt_key = $crypt_key;
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}
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public function php_encrypt($txt) {
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srand((double)microtime() * 1000000);
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$encrypt_key = md5(rand(0,32000));
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$ctr = 0;
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$tmp = '';
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for($i = 0;$i<strlen($txt);$i++) {
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$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
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$tmp .= $encrypt_key[$ctr].($txt[$i]^$encrypt_key[$ctr++]);
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}
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return base64_encode(self::__key($tmp,$this -> crypt_key));
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}
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public function php_decrypt($txt) {
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$txt = self::__key(base64_decode($txt),$this -> crypt_key);
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$tmp = '';
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for($i = 0;$i < strlen($txt); $i++) {
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$md5 = $txt[$i];
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$tmp .= $txt[++$i] ^ $md5;
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}
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return $tmp;
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}
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private function __key($txt,$encrypt_key) {
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$encrypt_key = md5($encrypt_key);
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$ctr = 0;
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$tmp = '';
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for($i = 0; $i < strlen($txt); $i++) {
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$ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
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$tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
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}
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return $tmp;
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}
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public function __destruct() {
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$this -> crypt_key = null;
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}
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}
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$sc = new SysCrypt('phpwms');
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$text = '110';
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print($sc -> php_encrypt($text));
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print('<br>');
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print($sc -> php_decrypt($sc -> php_encrypt($text)));
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?>
