php加密解密处理类
作者:jao 发布于:2012-12-17 22:30 分类:PHP教程
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<?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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?> |
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