php AES加解密

<?php

class AES
{


    /**
     * @param $key string 加密KEY
     * @param $iv string 加密向量
     * @param $data string 需要加密的数据
     * @return string
     */
    public static function encrypt($key, $iv, $data)
    {
        /**
         * 打开加密
         */
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, "", MCRYPT_MODE_CBC, "");
        /**
         * 初始化加密
         */
        mcrypt_generic_init($td, $key, $iv);
        /**
         * 加密
         */
        //$encrypted = mcrypt_generic($td, $data);
        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
        $pad = $block - (strlen($data) % $block);
        $data .= str_repeat(chr($pad), $pad);
        $encrypted = mcrypt_generic($td, $data);
        /**
         * 清理加密
         */
        mcrypt_generic_deinit($td);
        /**
         * 关闭
         */
        mcrypt_module_close($td);

        return base64_encode($encrypted);
    }

    /**
     * @param $key   string  加密KEY
     * @param $iv    string  偏移量
     * @param $data  string  加密的数据
     * @return string
     */
    public static function decrypt($key, $iv, $data)
    {
        /**
         * 打开加密
         */
        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128,"",MCRYPT_MODE_CBC,"");
        /**
         * 初始化加密
         */
        mcrypt_generic_init($td, $key, $iv);
        $decode = base64_decode($data);
        /**
         * 解密
         */
//        $block = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
//        $pad = $block - (strlen($data) % $block);
//        $data .= str_repeat(chr($pad), $pad);
        $dencrypted = mdecrypt_generic($td, $decode);
        /**
         * 清理加密
         */
        mcrypt_generic_deinit($td);
        /**
         * 关闭
         */
        mcrypt_module_close($td);

        return static::strippadding($dencrypted);
    }

    private static function strippadding($string) {
        $slast = ord(substr($string, -1));
        $slastc = chr($slast);
        $pcheck = substr($string, -$slast);
        if (preg_match("/$slastc{" . $slast . "}/", $string)) {
            $string = substr($string, 0, strlen($string) - $slast);
            return $string;
        } else {
            return false;
        }
    }
}
?>