Review

class Util {
   /**
    * Pads the input <code>in</code> according to ISO9797-1 padding method 2.
    *
    * @param in input
    *
    * @return padded output
    */
   public static byte[] pad(/*@ non_null */ byte[] in) {
      return pad(in, 0, in.length);
   }

}