encode and decode into bytearray

encodeStr.as

private function createByteArray(obj:Object):String   
    byteArr = new ByteArray(); 
    byteArr.writeObject(obj); 
    var encoded:String = Base64.encodeByteArray(byteArr); 
    return encoded;
}

private function decodeByteArray(encodedStr:String):Object
    var decodedByteArray:ByteArray = Base64.decodeToByteArray(encodedStr); 
    return decodedByteArray.readObject(); 
}