dstIndex += 4;

        // Padding to align data to 8-byte boundary
        dstIndex += 4;

        // Write lease V2 data (52 bytes total)
        leaseKey.encode(dst, dstIndex); // LeaseKey (16 bytes)
        dstIndex += 16;

        SMBUtil.writeInt4(leaseState, dst, dstIndex); // LeaseState (4 bytes)
        dstIndex += 4;

        SMBUtil.writeInt4(leaseFlags, dst, dstIndex); // LeaseFlags (4 bytes)

    }

    /**
     * Create a handle GUID from existing bytes
     * @param bytes the 16-byte GUID data in little-endian format (SMB wire format)
     */
    public HandleGuid(byte[] bytes) {
        if (bytes.length != 16) {
            throw new IllegalArgumentException("GUID must be 16 bytes");
        }

        // MS-SMB2 specifies little-endian byte ordering for GUID components

     *
     * @param key 16-byte array
     * @throws IllegalArgumentException if key is not 16 bytes
     */
    public Smb2LeaseKey(byte[] key) {
        if (key == null) {
            throw new IllegalArgumentException("Lease key cannot be null");
        }
        if (key.length != LEASE_KEY_SIZE) {
            throw new IllegalArgumentException("Lease key must be 16 bytes, got " + key.length);
        }

        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

    }

    /**
     * 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

        byte[] actualMachineId = new byte[32];
        System.arraycopy(value, 16, actualMachineId, 0, 32);
        assertArrayEquals(expectedMachineId, actualMachineId);

        // Verify the size field (first 4 bytes)
        assertEquals(48, (value[0] & 0xFF) | ((value[1] & 0xFF) << 8) | ((value[2] & 0xFF) << 16) | ((value[3] & 0xFF) << 24));
    }

    /**

        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);

        // 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);

- We limited the number of drives to 16 for erasure set because, erasure code shards more than 16 can become chatty and do not have any performance advantages. Additionally since 16 drive erasure set gives you tolerance of 8 drives per object by default which is plenty in any practical scenario.