code: public static NKey createOperator(SecureRandom random)
              throws IOException, NoSuchProviderException, NoSuchAlgorithmException {
          return createPair(Type.OPERATOR, random);
      }
docs: Create an Operator NKey from the provided random number generator.
  
  If no random is provided, SecureRandom.getInstance("SHA1PRNG", "SUN") will be used to creat eone.
  
  The new NKey contains the private seed, which should be saved in a secure location.
  
  @param random A secure random provider
  @return the new Nkey
  @throws IOException if the seed cannot be encoded to a string
  @throws NoSuchProviderException if the default secure random cannot be created
  @throws NoSuchAlgorithmException if the default secure random cannot be created