How to create a pair private/public keys using Node.js crypto?

Question

I have to generate two keys (private and public) to encrypt a text with the public and let the user with the private key decrypt the text.

Is it possible with the mo

Answer 1

I have not used it, but this may be useful:

http://ox.no/posts/diffie-hellman-support-in-node-js

Documentation is severely lacking on this (no examples that I could find).

Answer 2

child_process route is a terrible and non-scalable solution imo. Stay away.

I chose to go with keypair instead.

Answer 3

You can use this rsa-json module. It just spawns a openssl process, so it is pretty dependent on the OS (it does not work by default on windows).

Answer 4

const crypto = require('crypto');

  const { privateKey, publicKey } = crypto.generateKeyPairSync('rsa', {
    modulusLength: 2048,
    publicKeyEncoding: {
      type: 'spki',
      format: 'pem'
    },
    privateKeyEncoding: {
      type: 'pkcs8',
      format: 'pem'
    }
  }); 

Answer 5

Use the crypto module from npm to generate KeyPair.

var crypto = require('crypto');

var prime_length = 60;
var diffHell = crypto.createDiffieHellman(prime_length);

diffHell.generateKeys('base64');
console.log("Public Key : " ,diffHell.getPublicKey('base64'));
console.log("Private Key : " ,diffHell.getPrivateKey('base64'));

console.log("Public Key : " ,diffHell.getPublicKey('hex'));
console.log("Private Key : " ,diffHell.getPrivateKey('hex'));

Above is a example snippet. To know more checkout documentation http://nodejs.org/api/crypto.html

Answer 6

nodejs v10.12 now supports this natively with crypto.generateKeyPair

const { generateKeyPair } = require('crypto');
generateKeyPair('rsa', {
  modulusLength: 4096,
  publicKeyEncoding: {
    type: 'spki',
    format: 'pem'
  },
  privateKeyEncoding: {
    type: 'pkcs8',
    format: 'pem',
    cipher: 'aes-256-cbc',
    passphrase: 'top secret'
  }
}, (err, publicKey, privateKey) => {
  // Handle errors and use the generated key pair.
});