code: public final DataHasher addData(byte[] data) {
          Util.notNull(data, "Date");
  
          return addData(data, 0, data.length);
      }
docs: Adds data to the digest using the specified array of bytes, starting at an offset of 0.
  
  @param data the array of bytes.
  
  @return The same {@link DataHasher} object for chaining calls.
  
  @throws NullPointerException when input data is null.