code: public static DigestUtils getDigestUtils() {
      if (digestUtils == null) {
        try {
          Class clazz = Class.forName(DIGEST_UTILS);
          digestUtils = (DigestUtils) clazz.newInstance();
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
          LOGGER.warn("Cannot instanciate util: {}", e.getMessage());
          throw new IllegalStateException(e);
        }
      }
      return digestUtils;
    }
docs: Retrieve DigestUtils implementation
  @return DigestUtils instance