docs: @Override
      public Properties getProperties() {
          Properties properties = new Properties();
          properties.setProperty(Config.HASH_ALGORITHM, hashAlgorithm);
          properties.setProperty(Config.SECURITY_LEVEL, Integer.toString(securityLevel));
          properties.setProperty(Config.CERTIFICATE_FORMAT, CERTIFICATE_FORMAT);
          properties.setProperty(Config.SIGNATURE_ALGORITHM, DEFAULT_SIGNATURE_ALGORITHM);
          return properties;
      }