node/test/parallel/test-crypto-dh-constructor.js

'use strict';
const common = require('../common');
if (!common.hasCrypto)
  common.skip('missing crypto');

const assert = require('assert');
const crypto = require('crypto');
const { hasOpenSSL, hasFIPS } = require('../common/crypto');

const size = hasFIPS(3) ?
  2048 : (crypto.getFips() === 1 || hasOpenSSL(3) ? 1024 : 256);
const dh1 = crypto.createDiffieHellman(size);
const p1 = dh1.getPrime('buffer');

{
  const DiffieHellman = crypto.DiffieHellman;

  const dh = DiffieHellman(p1, 'buffer');
  assert(dh instanceof DiffieHellman, 'DiffieHellman is expected to return a ' +
                                      'new instance when called without `new`');
}

{
  const DiffieHellmanGroup = crypto.DiffieHellmanGroup;
  const dhg = DiffieHellmanGroup(hasFIPS(3) ? 'modp14' : 'modp5');
  assert(dhg instanceof DiffieHellmanGroup, 'DiffieHellmanGroup is expected ' +
                                            'to return a new instance when ' +
                                            'called without `new`');
}

{
  const ECDH = crypto.ECDH;
  const ecdh = ECDH('prime256v1');
  assert(ecdh instanceof ECDH, 'ECDH is expected to return a new instance ' +
                              'when called without `new`');
}