byte[] testSessionKey = new byte[16];
        Arrays.fill(testSessionKey, (byte) 0xAA);
        byte[] testPreauth = new byte[64];
        Arrays.fill(testPreauth, (byte) 0xBB);

        // When
        byte[] signingKey300 = Smb3KeyDerivation.deriveSigningKey(Smb2Constants.SMB2_DIALECT_0300, testSessionKey, testPreauth);

        // First decode to set internal state
        byte[] sourceBuffer = new byte[8];
        long expectedIndexNumber = 0x0123456789ABCDEFL;
        SMBUtil.writeInt8(expectedIndexNumber, sourceBuffer, 0);
        fileInternalInfo.decode(sourceBuffer, 0, sourceBuffer.length);

        // Now test encode
        byte[] destinationBuffer = new byte[8];
        int bytesEncoded = fileInternalInfo.encode(destinationBuffer, 0);

        // Arrange
        byte[] key14 = hex("01020304050607 11121314151617"); // two 7-byte chunks
        byte[] key7 = Arrays.copyOfRange(key14, 0, 7);
        byte[] data8 = NtlmUtil.S8;
        byte[] out14 = new byte[16];
        byte[] out7 = new byte[8];

        // Act
        NtlmUtil.E(key14, data8, out14);
        NtlmUtil.E(key7, data8, out7);

        // Assert: first block identical to single-chunk encryption

    }

    /**
     * Update the file ID after successful create response
     * @param newFileId the new 16-byte file ID
     */
    public void updateFileId(byte[] newFileId) {
        if (newFileId.length != 16) {
            throw new IllegalArgumentException("File ID must be 16 bytes");
        }
        System.arraycopy(newFileId, 0, this.fileId, 0, 16);
    }

    @Override

            andxCommand = (byte) 0xFF;
            andx = null;

            dst[start + ANDX_COMMAND_OFFSET] = (byte) 0xFF;
            dst[start + ANDX_RESERVED_OFFSET] = (byte) 0x00;
            //            dst[start + ANDX_OFFSET_OFFSET] = (byte)0x00;
            //            dst[start + ANDX_OFFSET_OFFSET + 1] = (byte)0x00;
            dst[start + ANDX_OFFSET_OFFSET] = (byte) 0xde;

        byte[] buffer = new byte[] { 0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; // count = 10

        int bytesRead = response.readParameterWordsWireFormat(buffer, 0);

        // The count should be read from the buffer.
        assertEquals(10L, response.count);
        // The method should return the number of bytes read.
        assertEquals(8, bytesRead);
    }

    /**

        void testReadBytesWireFormatNegativeAsUnsigned() {
            // Given
            byte[] buffer = new byte[10];
            // Write -1 which will be read as 65535 unsigned
            buffer[0] = (byte) 0xFF;
            buffer[1] = (byte) 0xFF;

            // When & Then
            SMBProtocolDecodingException exception =

        // Test with file ID having maximum byte values
        byte[] maxFileId = new byte[16];
        Arrays.fill(maxFileId, (byte) 0xFF);
        Smb2CloseRequest maxRequest = new Smb2CloseRequest(mockConfig, maxFileId, testFileName);

        byte[] buffer = new byte[256];
        int written = maxRequest.writeBytesWireFormat(buffer, 0);

        assertEquals(24, written);

        byte[] copiedFileId = new byte[16];

class MIENameTest {

    // Helper to build a valid buffer according to the expected layout.
    private static byte[] buildBuffer(byte[] oidDer, byte[] nameBytes) {
        byte[] tokId = new byte[] { 0x04, 0x01 };
        int oidLen = oidDer.length;
        int nameLen = nameBytes.length;

        byte[] buf = new byte[2 + 2 + oidLen + 4 + nameLen];
        int i = 0;
        // TOK_ID
        buf[i++] = tokId[0];

    assertFalse(sink.wasStreamClosed());

    out.write(new byte[] {1, 2, 3, 4});
    out.close();

    assertTrue(sink.wasStreamClosed());
    assertArrayEquals(new byte[] {1, 2, 3, 4}, sink.getBytes());
  }

  public void testWrite_bytes() throws IOException {
    assertArrayEquals(new byte[0], sink.getBytes());
    sink.write(bytes);

    assertTrue(sink.wasStreamOpened() && sink.wasStreamClosed());