private static class ServerDataStub extends ServerData {
        public ServerDataStub() {
            this.security = SmbConstants.SECURITY_USER;
            this.encryptedPasswords = false;
            this.encryptionKey = new byte[0];
        }
    }

    @Test
    void anonymousGuestCredentials() throws Exception {
        setupNegotiateStubs();

        NtlmPasswordAuthenticator auth = mock(NtlmPasswordAuthenticator.class);

        // SMB1 negotiation with server data
        SmbComNegotiateResponse smb1 = new SmbComNegotiateResponse(ctx);
        ServerData sd = smb1.getServerData();
        sd.encryptionKey = new byte[] { 1, 2, 3 };
        setField(transport, "negotiated", smb1);
        assertArrayEquals(new byte[] { 1, 2, 3 }, transport.getServerEncryptionKey());

        // SMB2 negotiation never exposes key via this API