[nodejs][javascript] Diffie-Hellman key exchange - nodejs v6

Diffie-Hellman.js

"use strict";
const assert = require("assert");
const crypto = require("crypto");

let server = crypto.createDiffieHellman(1024);
let prime = server.getPrime();

console.log("Generate Alice's keys...");
let alice = crypto.createDiffieHellman(prime);
let alicePublicKey = alice.generateKeys("base64");

console.log("Generate Bob's keys...");
let bob = crypto.createDiffieHellman(prime);
let bobPublicKey = bob.generateKeys("base64");

console.log("Generate David's keys...");
let david = crypto.createDiffieHellman(prime);
let davidPublicKey = david.generateKeys("base64");

console.log("Exchange and generate the secret...");
let aliceBobSecret = alice.computeSecret(bobPublicKey, "base64");
let bobAliceSecret = bob.computeSecret(alicePublicKey, "base64");
let davidAliceSecret = david.computeSecret(alicePublicKey, "base64");
let aliceDavidSecret = alice.computeSecret(davidPublicKey, "base64");

// console.log("alicePublicKey", alicePublicKey);
// console.log("bobPublicKey", bobPublicKey);
assert.notEqual(alicePublicKey, bobPublicKey);
console.log("alicePublicKey and bobPublicKey NOT equal");

// console.log("aliceBobSecret", aliceBobSecret.toString("base64"));
// console.log("bobAliceSecret", bobAliceSecret.toString("base64"));
assert.equal(aliceBobSecret.toString("hex"), bobAliceSecret.toString("hex"));
console.log("aliceBobSecret and bobAliceSecret equal");

console.log("----- Shared secret with 3rd person -----");

// console.log("alicePublicKey", alicePublicKey);
// console.log("davidPublicKey", davidPublicKey);
assert.notEqual(alicePublicKey, davidPublicKey);
console.log("alicePublicKey and davidPublicKey NOT equal");

// console.log("aliceDavidSecret", aliceDavidSecret.toString("base64"));
// console.log("davidAliceSecret", davidAliceSecret.toString("base64"));
assert.equal(aliceDavidSecret.toString("hex"), davidAliceSecret.toString("hex"));
console.log("aliceDavidSecret and davidAliceSecret equal");