assertEquals(0x0B, ServerMessageBlock2.SMB2_IOCTL);
            assertEquals(0x0C, ServerMessageBlock2.SMB2_CANCEL);
            assertEquals(0x0D, ServerMessageBlock2.SMB2_ECHO);
            assertEquals(0x0E, ServerMessageBlock2.SMB2_QUERY_DIRECTORY);
            assertEquals(0x0F, ServerMessageBlock2.SMB2_CHANGE_NOTIFY);
            assertEquals(0x10, ServerMessageBlock2.SMB2_QUERY_INFO);

        SMBUtil.writeInt2(8, buffer, 58); // Security buffer length

        // Add some dummy security data at offset 64 from start
        buffer[64] = (byte) 0x4E; // NTLMSSP signature start
        buffer[65] = (byte) 0x54;
        buffer[66] = (byte) 0x4C;
        buffer[67] = (byte) 0x4D;
        buffer[68] = (byte) 0x53;
        buffer[69] = (byte) 0x53;

      encodings[ 0x1a] = encoding // Substitute
      encodings[ 0x1b] = encoding // Escape
      encodings[ 0x1c] = encoding // File Separator
      encodings[ 0x1d] = encoding // Group Separator
      encodings[ 0x1e] = encoding // Record Separator
      encodings[ 0x1f] = encoding // Unit Separator
      encodings[ 0x7f] = encoding // Delete
    }

  fun nonAscii(encoding: Encoding) =
    apply {

        filter.init(filterConfig);

        // Test NTLM Type 1 message handling
        byte[] type1Message = new byte[] { 0x4E, 0x54, 0x4C, 0x4D, 0x53, 0x53, 0x50, 0x00, 0x01, 0x00, 0x00, 0x00 };
        String authHeader = "NTLM " + new String(org.bouncycastle.util.encoders.Base64.encode(type1Message));

        assertEquals("00010203", Hexdump.toHexString(data1, 0, 8)); // 8 chars = 4 bytes

        // Test with negative byte values
        byte[] data2 = { (byte) 0xFF, (byte) 0xFE, (byte) 0x80, 0x7F };
        assertEquals("FF", Hexdump.toHexString(data2, 0, 2)); // 2 chars = 1 byte
        assertEquals("FFF", Hexdump.toHexString(data2, 0, 3)); // 3 chars = 1.5 bytes (rounds up to 2)

    @BeforeEach
    void setUp() {
        MockitoAnnotations.openMocks(this);
        testMacSigningKey = new byte[] { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10 };
    }

    @Test
    @DisplayName("Test constructor with MAC signing key and bypass flag")
    void testConstructorWithBypass() {

            try (MockedStatic<Smb3KeyDerivation> mockedKeyDerivation = mockStatic(Smb3KeyDerivation.class)) {
                byte[] derivedKey = new byte[16];
                Arrays.fill(derivedKey, (byte) 0xDD);
                mockedKeyDerivation.when(
                        () -> Smb3KeyDerivation.deriveSigningKey(eq(Smb2Constants.SMB2_DIALECT_0302), any(byte[].class), any(byte[].class)))

            assertEquals((byte) 0x2B, ServerMessageBlock.SMB_COM_ECHO);
            assertEquals((byte) 0x2D, ServerMessageBlock.SMB_COM_OPEN_ANDX);
            assertEquals((byte) 0x2E, ServerMessageBlock.SMB_COM_READ_ANDX);
            assertEquals((byte) 0x2F, ServerMessageBlock.SMB_COM_WRITE_ANDX);
            assertEquals((byte) 0x32, ServerMessageBlock.SMB_COM_TRANSACTION2);

     * This is an enhanced version of Connect2 with additional parameters.
     */
    public static class SamrConnect4 extends DcerpcMessage {

        @Override
        public int getOpnum() {
            return 0x3e;
        }

        /** The return value of the operation */
        public int retval;
        /** The NetBIOS name of the server to connect to */
        public String system_name;

     * This is an enhanced version of Connect2 with additional parameters.
     */
    public static class SamrConnect4 extends DcerpcMessage {

        @Override
        public int getOpnum() {
            return 0x3e;
        }

        /** The return value of the operation */
        public int retval;
        /** The NetBIOS name of the server to connect to */
        public String system_name;