* @throws IOException
     */
    public void setupMIC ( byte[] type1, byte[] type2 ) throws GeneralSecurityException, IOException {
        byte[] sk = this.masterKey;
        if ( sk == null ) {
            return;
        }
        MessageDigest mac = Crypto.getHMACT64(sk);
        mac.update(type1);
        mac.update(type2);
        byte[] type3 = toByteArray();
        mac.update(type3);
        setMic(mac.digest());