spreadIntsToBytes(tempInts, 0, cipherText, cipherOff, 2);
    }

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

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