using (RijndaelManaged myRijndael = new RijndaelManaged())
                {
                    myRijndael.Key = aes.Key;
                    myRijndael.IV = aes.IV;

                    using (var stream = new MemoryStream())
                    {
                        using (var encryptor = myRijndael.CreateEncryptor())
                        {
                            using (var encrypt = new CryptoStream(stream, encryptor, CryptoStreamMode.Write))
                            {
                                encrypt.Write(file, 0, file.Length);
                                encrypt.FlushFinalBlock();

                                return stream.ToArray();
                            }
                        }
                    }