PHP编程：php实现cookie加密的方法

<?php
class Cookie
{
??? /**
???? * 解密已经加密了的cookie
???? *
???? * @param string $encryptedText
???? * @return string
???? */
??? private static function _decrypt($encryptedText)
??? {
??????? $key = Config::get('secret_key');
??????? $cryptText = base64_decode($encryptedText);
??????? $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256,MCRYPT_MODE_ECB);
??????? $iv = mcrypt_create_iv($ivSize,MCRYPT_RAND);
??????? $decryptText = mcrypt_decrypt(MCRYPT_RIJNDAEL_256,$key,$cryptText,MCRYPT_MODE_ECB,$iv);
??????? return trim($decryptText);
??? }
??? /**
???? * 加密cookie
???? *
???? * @param string $plainText
???? * @return string
???? */
??? private static function _encrypt($plainText)
??? {
??????? $key = Config::get('secret_key');
??????? $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256,MCRYPT_RAND);
??????? $encryptText = mcrypt_encrypt(MCRYPT_RIJNDAEL_256,$plainText,$iv);
??????? return trim(base64_encode($encryptText));
??? }
??? /**
???? * 删除cookie
???? *
???? * @param array $args
???? * @return boolean
???? */
??? public static function del($args)
??? {
??????? $name = $args['name'];
??????? $domain = isset($args['domain']) ? $args['domain'] : null;
??????? return isset($_COOKIE[$name]) ? setcookie($name,'',time() - 86400,'/',$domain) : true;
??? }
??? /**
???? * 得到指定cookie的值
???? *
???? * @param string $name
???? */
??? public static function get($name)
??? {
??????? return isset($_COOKIE[$name]) ? self::_decrypt($_COOKIE[$name]) : null;
??? }
??? /**
???? * 设置cookie
???? *
???? * @param array $args
???? * @return boolean
???? */
??? public static function set($args)
??? {
??????? $name = $args['name'];
??????? $value= self::_encrypt($args['value']);
??????? $expire = isset($args['expire']) ? $args['expire'] : null;
??????? $path = isset($args['path']) ? $args['path'] : '/';
??????? $domain = isset($args['domain']) ? $args['domain'] : null;
??????? $secure = isset($args['secure']) ? $args['secure'] : 0;
??????? return setcookie($name,$value,$expire,$path,$domain,$secure);
??? }
}