SMBUtil.writeInt4(50, minBuffer, 8);
            SMBUtil.writeInt4(0, minBuffer, 12);
            SMBUtil.writeInt4(0, minBuffer, 16);

            int bytesRead = response.readBytesWireFormat(minBuffer, 0);
            assertEquals(16, bytesRead);
            assertEquals(100, response.getCount());
            assertEquals(50, response.getRemaining());

            // Large buffer

            assertEquals(16, derivedKey.length, "Should always produce 16-byte key regardless of input size");
        }
    }

    @Test
    @DisplayName("Should derive unique keys for different session keys")
    void testDeriveKeys_UniqueSessionKeys() {
        // Given
        byte[] sessionKey1 = new byte[16];
        byte[] sessionKey2 = new byte[16];
        new SecureRandom().nextBytes(sessionKey1);

        // The decode method returns only the header size (16 bytes)\n        assertEquals(16, bytesDecoded);
    }

    @Test
    @DisplayName("Test decode without data")
    void testDecodeWithoutData() throws SMBProtocolDecodingException {
        // Prepare test data - only header, no data
        byte[] buffer = new byte[16];
        int bufferIndex = 0;

        // Set up test values

	VMSLTVI		$17, V2, V3			// ERROR "signed immediate 16 must be in range [-16, 15]"
	VMSLTVI		$-16, V2, V3			// ERROR "signed immediate -17 must be in range [-16, 15]"
	VMSLTUVI	$17, V2, V3			// ERROR "signed immediate 16 must be in range [-16, 15]"
	VMSLTUVI	$-16, V2, V3			// ERROR "signed immediate -17 must be in range [-16, 15]"
	VMSGEVI		$17, V2, V3			// ERROR "signed immediate 16 must be in range [-16, 15]"

    void testReadBytesWireFormatValidStructure() throws SMBProtocolDecodingException {
        // Given
        byte[] buffer = new byte[256];
        int offset = 10;

        // Write valid structure (16 bytes)
        SMBUtil.writeInt2(16, buffer, offset); // Structure size
        buffer[offset + 2] = (byte) 0x01; // Share type (DISK)
        buffer[offset + 3] = 0; // Reserved

        mockConfig = mock(Configuration.class);
        mockContext = mock(CIFSContext.class);
        when(mockContext.getConfig()).thenReturn(mockConfig);

        // Create a test file ID (16 bytes)
        testFileId = new byte[16];
        for (int i = 0; i < 16; i++) {
            testFileId[i] = (byte) (i + 1);
        }

        testFileName = "test-file.txt";
        request = new Smb2CloseRequest(mockConfig, testFileId, testFileName);

        mockConfig = mock(Configuration.class);
        mockContext = mock(CIFSContext.class);
        when(mockContext.getConfig()).thenReturn(mockConfig);

        // Create a test file ID (16 bytes)
        testFileId = new byte[16];
        for (int i = 0; i < 16; i++) {
            testFileId[i] = (byte) (i + 1);
        }

        request = new Smb2FlushRequest(mockConfig, testFileId);
    }

    @Test

        // Nonces should have proper size
        assertEquals(16, nonce1.length, "GCM nonce should be 16 bytes");
        assertEquals(16, nonce2.length, "GCM nonce should be 16 bytes");
        assertEquals(16, nonce3.length, "GCM nonce should be 16 bytes");

        // For GCM, last 4 bytes should contain incrementing counter

    private static final int SIGNATURE_LENGTH = 16;

    @BeforeAll
    static void setupClass() {
        // Ensure BouncyCastle provider is available for AES-CMAC
        if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null) {
            Security.addProvider(new BouncyCastleProvider());
        }
    }

    @BeforeEach
    void setup() {
        sessionKey = new byte[16];
        Arrays.fill(sessionKey, (byte) 0xAA);

    private byte[] defaultClientGuid;
    private int[] defaultDialects;

    @BeforeEach
    void setUp() {
        // Initialize default GUID (16 bytes)
        defaultClientGuid = new byte[16];
        for (int i = 0; i < 16; i++) {
            defaultClientGuid[i] = (byte) (i + 1);
        }

        // Initialize default dialects