When we check the doc of crypto from https://nodejs.org/api/crypto.html#cryptogeneratekeypairtype-options-callback, we see this sentence.

If this method is invoked as its util.promisify()ed version, it returns a Promise for an Object with publicKey and privateKey properties.

Then, how to use the promisified one? We tried ten more ways and none of them worked.

CodePudding user response：

You can use it like this. It resolves to object which contain publicKey and privateKey

const util = require('util');
const crypto = require('crypto');

const gen = util.promisify(crypto.generateKeyPair);
(async () => {
  const res = await gen('rsa', {
    modulusLength: 4096,
    publicKeyEncoding: {
      type: 'spki',
      format: 'pem'
    },
    privateKeyEncoding: {
      type: 'pkcs8',
      format: 'pem',
      cipher: 'aes-256-cbc',
      passphrase: 'top secret'
    }
  });
  console.log(res);
})();