Java8Compatibility.limit(bb, chunkSize + 7); // get ready to pad with longs
    while (bb.position() < chunkSize) {
      bb.putLong(0);
    }
    Java8Compatibility.limit(bb, chunkSize);
    Java8Compatibility.flip(bb);
    process(bb);
  }

  @Override
  @CanIgnoreReturnValue
  public final Hasher putBytes(byte[] bytes, int off, int len) {