protected virtual void Dispose(bool disposing)
        {
            if (disposed)
            {
                return;
            }

            if (disposing)
            {
                if (CRC64 != null)
                {
                    CRC64.Dispose();
                }
                if (MD5 != null)
                {
                    MD5.Dispose();
                }
            }

            disposed = true;
        }