assertEquals(0x1111, desc1.fid);
        assertEquals(OWNER_SECURITY_INFORMATION, desc1.securityInformation);

        assertEquals(0x2222, desc2.fid);
        assertEquals(GROUP_SECURITY_INFORMATION, desc2.securityInformation);

        assertEquals(0x3333, desc3.fid);
        assertEquals(DACL_SECURITY_INFORMATION, desc3.securityInformation);

        // Verify writing doesn't affect other instances

        final byte[] key7 = new byte[7];
        final byte[] e8 = new byte[8];

        for (int i = 0; i < key.length / 7; i++) {
            System.arraycopy(key, i * 7, key7, 0, 7);
            final DES des = new DES(key7);
            des.encrypt(data, e8);
            System.arraycopy(e8, 0, e, i * 8, 8);
        }
    }

    static String DEFAULT_DOMAIN;
    static String DEFAULT_USERNAME;
    static String DEFAULT_PASSWORD;

        SmbAuthException authEx = new SmbAuthException("denied");
        when(dest.openUnshared(anyInt(), anyInt(), anyInt(), anyInt(), anyInt())).thenThrow(authEx);
        when(dest.getAttributes()).thenReturn(SmbConstants.ATTR_ARCHIVE); // no READONLY bit

        // Act + Assert
        SmbAuthException thrown =

        byte[] data = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        ByteEncodable encodable = new ByteEncodable(data, 0, 3);
        byte[] dest = new byte[5]; // {0,0,0,0,0}
        dest[0] = (byte) 0xFF; // Add some initial data to dest

        int encodedLen = encodable.encode(dest, 1);

        // Verify encoded length
        assertEquals(3, encodedLen, "Encoded length should be equal to the specified length");

        assertArrayEquals(before, dest, "Zero length should leave dest unchanged");
    }

    @Test
    @DisplayName("writeSecurityBuffer copies data and sets fields")
    void testWriteSecurityBufferNonZero() {
        byte[] dest = new byte[8 + 4];
        byte[] payload = { 0x55, 0x66, 0x77 };
        NtlmMessage.writeSecurityBuffer(dest, 0, 8, payload);

        final String path = dest.getLocator().getUNCPath();
        if (path.length() > 1) {
            try {
                dest.mkdir();
                if (dh.hasCapability(SmbConstants.CAP_NT_SMBS)) {
                    dest.setPathInformation(src.getAttributes(), src.createTime(), src.lastModified(), src.lastAccess());
                } else {

    /**
     * Constant-time array copy to prevent timing attacks
     */
    private void constantTimeCopy(byte[] src, int srcPos, byte[] dest, int destPos, int length) {
        // Simple constant-time copy - always process all bytes
        for (int i = 0; i < length; i++) {
            dest[destPos + i] = src[srcPos + i];
        }
    }

    /**
     * Decrypt an SMB2 message
     *
     * @param encryptedMessage

    static void writeULong(final byte[] dest, final int offset, final int ulong) {
        dest[offset] = (byte) (ulong & 0xff);
        dest[offset + 1] = (byte) (ulong >> 8 & 0xff);
        dest[offset + 2] = (byte) (ulong >> 16 & 0xff);
        dest[offset + 3] = (byte) (ulong >> 24 & 0xff);
    }

    static void writeUShort(final byte[] dest, final int offset, final int ushort) {
        dest[offset] = (byte) (ushort & 0xff);

        // Test with empty source array
        dest = new byte[8];
        nextOffset = NtlmMessage.writeSecurityBuffer(dest, 0, new byte[0]);
        assertEquals(4, nextOffset, "Should return correct next offset for empty source.");
        assertEquals(0, NtlmMessage.readUShort(dest, 0), "Length should be 0 for empty source.");

        // Verify description
        byte[] descr = NetServerEnum2.DESCR[0].getBytes("ASCII");
        byte[] writtenDescr = new byte[descr.length];
        System.arraycopy(dst, 2, writtenDescr, 0, descr.length);
        assertArrayEquals(descr, writtenDescr);

        int currentIndex = 2 + descr.length;
        // Verify level (0x0001)