generateKeypair.js

/**
 * This module will generate a public and private keypair and save to current directory
 *
 * Make sure to save the private key elsewhere after generated!
 */
const crypto = require("crypto");
const fs = require("fs");

function genKeyPair() {
  // Generates an object where the keys are stored in properties `privateKey` and `publicKey`
  const keyPair = crypto.generateKeyPairSync("rsa", {
    modulusLength: 4096, // bits - standard for RSA keys
    publicKeyEncoding: {
      type: "pkcs1",     // "Public Key Cryptography Standards 1"
      format: "pem",     // Most common formatting choice
    },
    privateKeyEncoding: {
      type: "pkcs1",      // "Public Key Cryptography Standards 1"
      format: "pem",      // Most common formatting choice
    },
  });

  
  // Create the public key file
  fs.writeFileSync(__dirname + "/id_rsa_pub.pem", keyPair.publicKey);

  // Create the private key file
  fs.writeFileSync(__dirname + "/id_rsa_priv.pem", keyPair.privateKey);
}

// Generate the keypair
genKeyPair();