private void DecryptFile(Stream encryptedFile, Stream decryptedFile)
        {
            CryptUtility cu = new CryptUtility();

            cu.DecryptFile(decryptedFile, encryptedFile, getDecryptionKey());
        }
        private String createChecksum()
        {
            CryptUtility cu = new CryptUtility();

            return(cu.pbkdf2(pkgInfo.KeyCode, pkgInfo.PackageCode, 1024));
        }