byte[] ipad = new byte[64];
        byte[] opad = new byte[64];

        // HMACT64 specific: truncate key to 64 bytes if needed
        int keyLen = Math.min(key.length, 64);
        for (int i = 0; i < keyLen; i++) {
            ipad[i] = (byte) (key[i] ^ 0x36);
            opad[i] = (byte) (key[i] ^ 0x5c);
        }
        for (int i = keyLen; i < 64; i++) {
            ipad[i] = 0x36;

      new SipHashFunction(2, 4, 0x0706050403020100L, 0x0f0e0d0c0b0a0908L);

  // The number of compression rounds.
  private final int c;
  // The number of finalization rounds.
  private final int d;
  // Two 64-bit keys (represent a single 128-bit key).
  private final long k0;
  private final long k1;

  /**
   * @param c the number of compression rounds (must be positive)

        int bytesWritten = request.writeBytesWireFormat(buffer, 64);

        // Verify all fields in the buffer
        assertEquals(33, SMBUtil.readInt2(buffer, 64)); // Structure size
        assertEquals((byte) 0x02, buffer[66]); // Info type
        assertEquals((byte) 0x08, buffer[67]); // File info class
        assertEquals(64, SMBUtil.readInt4(buffer, 68)); // Buffer length

  /**
   * Sorts the array, treating its elements as unsigned 64-bit integers.
   *
   * @since 23.1
   */
  public static void sort(long[] array) {
    checkNotNull(array);
    sort(array, 0, array.length);
  }

  /**
   * Sorts the array between {@code fromIndex} inclusive and {@code toIndex} exclusive, treating its
   * elements as unsigned 64-bit integers.
   *
   * @since 23.1
   */

        void testReadValidOplockBreakNotification() throws Exception {
            // Create a valid buffer with structure size 24
            byte[] buffer = new byte[64];
            int bufferIndex = 0;

            // Write structure size (24)
            SMBUtil.writeInt2(24, buffer, bufferIndex);

            // Write oplock level at offset 2

        int bytesWritten = request.writeBytesWireFormat(buffer, 64);

        // Verify all fields in the buffer
        assertEquals(41, SMBUtil.readInt2(buffer, 64)); // Structure size
        assertEquals(Smb2Constants.SMB2_0_INFO_FILE, buffer[66]); // Info type (set by setFileInfoClass)
        assertEquals((byte) 0x0A, buffer[67]); // File info class
        assertEquals(64, SMBUtil.readInt4(buffer, 76)); // Input buffer length

        void testEncodeValidSize() {
            byte[] buffer = new byte[1024];
            testRequest.setTestSize(64);
            testRequest.setTestLength(64);

            int result = testRequest.encode(buffer, 0);

            assertEquals(64, result);
        }

        @Test
        @DisplayName("encode should throw exception when size mismatch")

                + ((src[srcIndex + 3] & 0xFF) << 24);
    }

    /**
     * Reads a 64-bit integer value from a byte array in little-endian format
     * @param src the source byte array
     * @param srcIndex the starting index in the source array
     * @return the 64-bit integer value
     */
    public static long readInt8(final byte[] src, final int srcIndex) {

        // Then
        assertNotNull(result);
        assertFalse(result.isEmpty());
        // Should contain hex representation of first bytes
        assertTrue(result.startsWith("00010203"));
        assertEquals(64, result.length()); // 32 bytes * 2 chars per byte
    }

    @ParameterizedTest
    @ValueSource(ints = { 1, 16, 32, 64, 128, 256 })
    @DisplayName("Should handle various data sizes")

        calcMethod.setAccessible(true);

        byte[] input = "test data".getBytes();
        byte[] oldHash = new byte[64];

        byte[] newHash = (byte[]) calcMethod.invoke(transport, input, 0, input.length, oldHash);

        assertNotNull(newHash);
        assertEquals(64, newHash.length); // SHA-512 produces 64 bytes
        assertNotEquals(oldHash, newHash); // Should be different instance
    }

    /**