md5.update((byte) 0);
        return md5.digest();
    }

    @Override
    public boolean supportsIntegrity() {
        return true;
    }

    @Override
    public boolean isMICAvailable() {
        return !this.auth.isGuest() && this.signKey != null && this.verifyKey != null;
    }

    @Override
    public byte[] calculateMIC(final byte[] data) throws CIFSException {