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_MODE_ECB);

        $iv = mcrypt_create_iv($ivSize, MCRYPT_RAND);

        $encryptText = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $plainText, MCRYPT_MODE_ECB, $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);

    }

}