serverData.encryptionKeyLength = 8;
        response.byteCount = 15; // 8 bytes key + 6 bytes "DOMAIN" + 1 null terminator

        // Prepare byte array
        byte[] encryptionKey = "12345678".getBytes();
        byte[] domainNameBytes = "DOMAIN".getBytes(ServerMessageBlock.OEM_ENCODING);
        ByteBuffer buffer = ByteBuffer.allocate(response.byteCount);
        buffer.put(encryptionKey);

        assertEquals("FFFFFFFFFFFFFFFF", Hexdump.toHexString(-1L, 16));

        // Test different sizes
        assertEquals("00000000", Hexdump.toHexString(0L, 8));
        assertEquals("12345678", Hexdump.toHexString(0x12345678L, 8));
    }

    @Test
    @DisplayName("Should handle special byte values correctly")
    void testSpecialByteValues() {
        // Test boundary values

  public void testKnownValues() {
    assertSip(new byte[] {}, 0x726fdb47dd0e0e31L);
    assertSip(new byte[] {0x61}, 0x2ba3e8e9a71148caL);
    assertSip(new byte[1000000], 0x28205108397aa742L);
    assertSip("12345678", 0x02130609caea37ebL);
    assertSip("abcdef", 0x2a6e77e733c7c05dL);
    assertSip("SipHash", 0x8325093242a96f60L);
  }

  // Test for common pitfall regarding sign extension.

  public void testKnownValues() {
    assertSip(new byte[] {}, 0x726fdb47dd0e0e31L);
    assertSip(new byte[] {0x61}, 0x2ba3e8e9a71148caL);
    assertSip(new byte[1000000], 0x28205108397aa742L);
    assertSip("12345678", 0x02130609caea37ebL);
    assertSip("abcdef", 0x2a6e77e733c7c05dL);
    assertSip("SipHash", 0x8325093242a96f60L);
  }

  // Test for common pitfall regarding sign extension.

    @Test
    @DisplayName("Should perform DES encryption/decryption")
    void testDES() throws Exception {
        // Given
        byte[] key = "testkey1".getBytes(); // 8 bytes for DES
        byte[] plaintext = "12345678".getBytes(); // 8 bytes (DES block size)

        // When
        Cipher desCipher = Crypto.getDES(key);
        desCipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "DES"));

    }

    @Test
    public void test_withDesCipher() {
        // Test with DES cipher
        InvertibleCryptographer des = InvertibleCryptographer.createDesCipher("12345678");
        FessSecurityResourceProvider provider = new FessSecurityResourceProvider(des, oneWayCryptographer);

        assertNotNull(provider);
        assertEquals(des, provider.providePrimaryInvertibleCryptographer());

        // Write test data to buffer
        int fileAttributes = 0x0021; // FILE_ATTRIBUTE_READONLY | FILE_ATTRIBUTE_ARCHIVE
        long lastWriteTime = System.currentTimeMillis();
        int fileSize = 12345678;

        SMBUtil.writeInt2(fileAttributes, buffer, bufferIndex);
        SMBUtil.writeUTime(lastWriteTime, buffer, bufferIndex + 2);
        SMBUtil.writeInt4(fileSize, buffer, bufferIndex + 6);

    }
  }

  public void testDecodeInt() {
    assertThat(UnsignedInts.decode("0xffffffff")).isEqualTo(0xffffffff);
    assertThat(UnsignedInts.decode("01234567")).isEqualTo(01234567); // octal
    assertThat(UnsignedInts.decode("#12345678")).isEqualTo(0x12345678);
    assertThat(UnsignedInts.decode("76543210")).isEqualTo(76543210);
    assertThat(UnsignedInts.decode("0x13579135")).isEqualTo(0x13579135);

        assertEquals("00FF", Hexdump.toHexString(255L, 4));

        // Test larger values
        assertEquals("0000000012345678", Hexdump.toHexString(0x12345678L, 16));
        assertEquals("12345678", Hexdump.toHexString(0x12345678L, 8));
        assertEquals("5678", Hexdump.toHexString(0x12345678L, 4));

        // Test negative values (treated as unsigned)

Shinsuke Sugaya <******@****.***> 1755307968 +0900