code: public void updateDigest(MessageDigest digest)
      {
          ByteBuffer longBuffer = ByteBuffer.allocate(8);
          for (int i = 0; i < size; i++)
          {
              for (int j = 0; j < starts[i].size(); j++)
                  digest.update(starts[i].get(j).duplicate());
              for (int j = 0; j < ends[i].size(); j++)
                  digest.update(ends[i].get(j).duplicate());
  
              longBuffer.putLong(0, markedAts[i]);
              digest.update(longBuffer.array(), 0, 8);
          }
      }
docs: Calculates digest for triggering read repair on mismatch