class AesSecurity
{
    /**
     * method 為AES-128-CBC時
     * @var string傳入要加密的明文
     * 傳入一個16位元組的key
     * 傳入一個16位元組的初始偏移向量IV
     */
    private static $method = 'AES-128-CBC';
    private static $key = 'contentWindowHig';
    private static $options = OPENSSL_RAW_DATA;
    private static $iv = 'contentDocuments';

    public static function getKey()
    {
        return self::$key;
    }
    public function __construct()
    {
      //  self::$key = md5(self::$key,true);
    }

    public static function setMethod($method){
        self::$method = $method;
    }
    public static function setKey($key){
        self::$key = $key;
    }
    /**
     * @param $options 可取值 OPENSSL_ZERO_PADDING OPENSSL_RAW_DATA
     */
    public static function setOptions($options){
        self::$options = $options;
    }

    public static function _encrypt($input){
        $key = substr(md5(self::$key),0,16);
        $iv = substr(md5(self::$iv),0,16);
        $data = base64_encode(openssl_encrypt($input,"AES-128-CBC",$key,OPENSSL_RAW_DATA,$iv));
        return $data;
    }

    /**
     * @param $input
     * @return bool|string
     * todo rtrim
     */
    public static function _decrypt($input){
        $key = substr(md5(self::$key),0,16);
        $iv = substr(md5(self::$iv),0,16);
        $data = openssl_decrypt(base64_decode($input),"AES-128-CBC",$key,OPENSSL_RAW_DATA,$iv);
        return $data;
    }
    
}

#js端
<script type="text/javascript" >
    var key_base = 'contentWindowHig';
    var iv_base = 'contentDocuments'
    var key_hash = CryptoJS.MD5(key_base).toString();
    var iv_hash = CryptoJS.MD5(iv_base).toString();
    var key = CryptoJS.enc.Utf8.parse(key_hash.substr(0,16));
    var iv = CryptoJS.enc.Utf8.parse(iv_hash.substr(0,16));
    function _decrypt(string) {
        var data = CryptoJS.AES.decrypt(string, key, {iv: iv, padding: CryptoJS.pad.Pkcs7}).toString(CryptoJS.enc.Utf8);
        return data;
    }
    function _encrypt(string) {
        var data = CryptoJS.AES.encrypt(string, key, {
            iv: iv,
            mode: CryptoJS.mode.CBC,
            padding: CryptoJS.pad.Pkcs7
        }).toString();
        return data;
    }

    var a = _encrypt('msgg');
    var b = _decrypt(a);
    var c= _decrypt('evD5EE8QGSWpuqzhDFaamw==')
    console.log(a);
    console.log(b);
    console.log(c);
</script>