SecretKeySpec key = new SecretKeySpec(new byte[16], "ARCFOUR");
        byte[] mac = PacMac.calculateMacArcfourHMACMD5(3, key, TEST_DATA);
        assertNotNull(mac);
        assertEquals(16, mac.length);

        // Test with a different key usage
        byte[] mac2 = PacMac.calculateMacArcfourHMACMD5(9, key, TEST_DATA);
        assertNotNull(mac2);
        assertEquals(16, mac2.length);

        // Test with another key usage

        SMBUtil.writeInt4(TRANSFORM_PROTOCOL_ID, dst, dstIndex);
        dstIndex += 4;

        // Signature (16 bytes)
        System.arraycopy(this.signature, 0, dst, dstIndex, 16);
        dstIndex += 16;

        // Nonce (16 bytes)
        System.arraycopy(this.nonce, 0, dst, dstIndex, 16);
        dstIndex += 16;

        // Original message size
        SMBUtil.writeInt4(this.originalMessageSize, dst, dstIndex);

    private static final int STRUCTURE_SIZE = 16;

    private byte[] fileId; // 16-byte file ID from previous open

    /**
     * Create a new durable handle reconnect context
     * @param fileId the 16-byte file ID from the previous open
     */
    public DurableHandleReconnect(byte[] fileId) {
        if (fileId.length != 16) {
            throw new IllegalArgumentException("File ID must be 16 bytes");
        }

     *
     * @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);
        }

        byte[] md4Hash = md4.digest(data);
        byte[] md5Hash = md5.digest(data);

        // Then
        assertNotNull(md4Hash);
        assertNotNull(md5Hash);
        assertEquals(16, md4Hash.length);
        assertEquals(16, md5Hash.length);
    }

    @Test
    @DisplayName("Should handle empty input for hashing")
    void testEmptyInputHashing() {
        // Given
        byte[] emptyData = {};

	MOVF	F2, 16(R1)
	MOVF	F2, (R1)

	//
	// store ints and bytes
	//
	//	LMOVW rreg ',' addr
	//	{
	//		outcode(int($1), &$2, 0, &$4);
	//	}
	MOVW	R1, foo<>+3(SB)
	MOVW	R1, 16(R2)
	MOVW	R1, (R2)
	MOVW	R1, foo<>+3(SB)
	MOVW	R1, 16(R2)
	MOVW	R1, (R2)
	SC	R1, (R2)

	//	LMOVB rreg ',' addr
	//	{
	//		outcode(int($1), &$2, 0, &$4);
	//	}
	MOVB	R1, foo<>+3(SB)
	MOVB	R1, 16(R2)

        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

        map sigbuild-r2.16-python3.9 2.16-python3.9
        map sigbuild-r2.16-python3.10 2.16-python3.10
        map sigbuild-r2.16-python3.11 2.16-python3.11
        map sigbuild-r2.16-python3.12 2.16-python3.12
        # TF 2.16 + Clang (containers are the same, but env vars in configs.bzl are different)
        map sigbuild-r2.16-clang 2.16-python3.11
        map sigbuild-r2.16-clang-python3.9 2.16-python3.9

    }

    /**
     * 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