public RijndaelDecryptTransformVM(string filePath, string decryptFilePath, byte[] key,
                                          Rijndael_.Size blockSize, bool isDeleteAfter, bool multithread = false)
            : base(isDeleteAfter, CryptoDirection.Decrypt)
        {
            CryptoName     = "Rijndael";
            SourceFilePath = filePath;
            DestFilePath   = decryptFilePath;

            if (multithread)
            {
                StartMultithread(Rijndael_.GetNice(key, blockSize, CryptoDirection.Decrypt));
            }
            else
            {
                Start(Rijndael_.Get(key, blockSize, CryptoDirection.Decrypt));
            }
        }