valid = new Boolean(DIGEST0.equals(Util.toString(new Tiger().digest())));
valid = Boolean.valueOf(DIGEST0.equals(Util.toString(new Tiger().digest())));
  public boolean selfTest()  {    if (valid == null)      {        valid = new Boolean(DIGEST0.equals(Util.toString(new Tiger().digest())));      }    return valid.booleanValue();  }