keypairs.js/lib/node/generate-privkey-ursa.js

// Copyright 2016-2018 AJ ONeal. All rights reserved
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
'use strict';

module.exports = function (bitlen, exp) {
	var ursa;
	try {
		ursa = require('ursa');
	} catch (e) {
		ursa = require('ursa-optional');
	}
	var keypair = ursa.generatePrivateKey(bitlen, exp);
	var result = {
		privateKeyPem: keypair.toPrivatePem().toString('ascii').trim()
	};
	return result;
};

if (require.main === module) {
	var keypair = module.exports(2048, 0x10001);
	console.info(keypair.privateKeyPem);
}