}
    }


    /// Encrypt a block of eight bytes.
    private void encrypt( byte[] clearText, int clearOff, byte[] cipherText, int cipherOff ) {

        squashBytesToInts( clearText, clearOff, tempInts, 0, 2 );
        des( tempInts, tempInts, encryptKeys );
        spreadIntsToBytes( tempInts, 0, cipherText, cipherOff, 2 );
    }

    /// Decrypt a block of eight bytes.