final byte[] ciphertext;
        final byte[] authTag;

        EncryptionResult(byte[] ciphertext, byte[] authTag) {
            this.ciphertext = ciphertext;
            this.authTag = authTag;
        }
    }

    /**
     * Encrypt using AES-GCM with constant-time operations
     */

     */
    public static byte[] calculateMacHMACAES(int usage, KerberosKey baseKey, byte[] input) throws GeneralSecurityException {
        byte[] cst = { (byte) (usage >> 24 & 0xFF), (byte) (usage >> 16 & 0xFF), (byte) (usage >> 8 & 0xFF), (byte) (usage & 0xFF),
                (byte) 0x99 };

        byte[] output = new byte[12];
        byte[] dk = deriveKeyAES(baseKey, cst); // Checksum key
        try {

     */
    @Test
    public void testInvalidBufferSizeRejection() {
        // Given - Buffers with various invalid sizes
        byte[] tooSmall = new byte[1024];
        byte[] tooLarge = new byte[SmbComTransaction.TRANSACTION_BUF_SIZE + 1];
        byte[] empty = new byte[0];

        // When - Try to release invalid buffers
        assertDoesNotThrow(() -> {
            BufferCache.releaseBuffer(tooSmall);

    }

    // KGS!@#$%
    static final byte[] S8 = { (byte) 0x4b, (byte) 0x47, (byte) 0x53, (byte) 0x21, (byte) 0x40, (byte) 0x23, (byte) 0x24, (byte) 0x25 };

    /*
     * Accepts key multiple of 7
     * Returns enc multiple of 8
     * Multiple is the same like: 21 byte key gives 24 byte result
     */
    static void E(final byte[] key, final byte[] data, final byte[] e) throws ShortBufferException {

        FileRenameInformation2 info = new FileRenameInformation2(unicodeFileName, false);

        byte[] buffer = new byte[200];
        int bytesWritten = info.encode(buffer, 0);

        // Verify the encoded data
        int nameLength = SMBUtil.readInt4(buffer, 16);
        byte[] nameBytes = new byte[nameLength];
        System.arraycopy(buffer, 20, nameBytes, 0, nameLength);

        void testWriteBytesWireFormat() {
            byte[] buffer = new byte[1024];
            int result = response.writeBytesWireFormat(buffer, 0);
            assertEquals(0, result);
        }

        @Test
        @DisplayName("Should return 0 regardless of buffer position")
        void testWriteBytesWireFormatDifferentPosition() {
            byte[] buffer = new byte[1024];

    void testReadULong() {
        byte[] a = new byte[] { (byte) 0x01, (byte) 0x02, (byte) 0x03, (byte) 0x04 };
        int result = NtlmMessage.readULong(a, 0);
        assertEquals(0x04030201, result, "ULong should be little‑endian");
    }

    @Test
    @DisplayName("readUShort correctly interprets little endian")
    void testReadUShort() {
        byte[] a = new byte[] { (byte) 0xAA, (byte) 0xBB };

        }

        @Test
        @DisplayName("Should handle various file ID sizes")
        void testVariousFileIdSizes() {
            byte[] shortFileId = new byte[8];
            byte[] standardFileId = new byte[16];
            byte[] longFileId = new byte[32];

            assertDoesNotThrow(() -> request.setFileId(shortFileId));
            assertDoesNotThrow(() -> request.setFileId(standardFileId));

        // fid 0x1234, lastWriteTime 0 -> UTime all 0xFF
        return Stream.of(Arguments.of(0x1234, 0L, new byte[] { 0x34, 0x12, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF, (byte) 0xFF }),
                // negative fid wraps around, lastWriteTime = 1000 -> 1 second -> int value 1
                Arguments.of(-1, 1000L, new byte[] { (byte) 0xFF, (byte) 0xFF, 0x01, 0x00, 0x00, 0x00 }));
    }

    /**

    @Test
    @DisplayName("Should set and get lease key")
    void testLeaseKeyAccessors() {
        byte[] newKeyBytes = new byte[] { (byte) 0xFF, (byte) 0xFE, (byte) 0xFD, (byte) 0xFC, (byte) 0xFB, (byte) 0xFA, (byte) 0xF9,
                (byte) 0xF8, (byte) 0xF7, (byte) 0xF6, (byte) 0xF5, (byte) 0xF4, (byte) 0xF3, (byte) 0xF2, (byte) 0xF1, (byte) 0xF0 };
        Smb2LeaseKey newKey = new Smb2LeaseKey(newKeyBytes);