code: public static long[] hash128(
        byte[] data, int offset, int length, long[] key) {
      HighwayHash h = new HighwayHash(key);
      h.processAll(data, offset, length);
      return h.finalize128();
    }
docs: NOTE: The 128-bit HighwayHash algorithm is not yet frozen and subject to change.
  
  @param data array with data bytes
  @param offset position of first byte of data to read from
  @param length number of bytes from data to read
  @param key array of size 4 with the key to initialize the hash with
  @return array of size 2 containing 128-bit hash for the given data