code: public long[] finalize128() {
      permuteAndUpdate();
      permuteAndUpdate();
      permuteAndUpdate();
      permuteAndUpdate();
      permuteAndUpdate();
      permuteAndUpdate();
      done = true;
      long[] hash = new long[2];
      hash[0] = v0[0] + mul0[0] + v1[2] + mul1[2];
      hash[1] = v0[1] + mul0[1] + v1[3] + mul1[3];
      return hash;
    }
docs: Computes the hash value after all bytes were processed. Invalidates the
  state.
  
  NOTE: The 128-bit HighwayHash algorithm is not yet frozen and subject to change.
  
  @return array of size 2 containing 128-bit hash