rsa-compat.js/lib/generate-privkey-node.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';

var Keypairs = require('keypairs');

module.exports = function (bitlen, exp) {
  var keypair = require('crypto').generateKeyPairSync(
    'rsa'
  , { modulusLength: bitlen
    , publicExponent: exp
    , privateKeyEncoding: {
        type: 'pkcs1'
      , format: 'pem'
      }
    , publicKeyEncoding: {
        type: 'pkcs1'
      , format: 'pem'
      }
    }
  );
  var result = {
    publicKeyPem: keypair.publicKey.trim()
  , privateKeyPem: keypair.privateKey.trim()
  };
  result.publicKeyJwk = Keypairs._importSync({ pem: result.publicKeyPem, public: true });
  result.privateKeyJwk = Keypairs._importSync({ pem: result.privateKeyPem });
  return result;
};

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