ECDH key exchange with AES encryption using iocane

ecdh_iocane.js

// To use this, you will need to `npm install iocane`!

const crypto = require("crypto");

let aliceECDH = crypto.createECDH("secp256k1");
aliceECDH.generateKeys();

let alicePublicKey = aliceECDH.getPublicKey(null, "compressed"),
    alicePrivateKey = aliceECDH.getPrivateKey(null, "compressed");

console.log("Alice Public: ", alicePublicKey.length, alicePublicKey.toString("hex"));
console.log("Alice Private:", alicePrivateKey.length, alicePrivateKey.toString("hex"));

let bobECDH = crypto.createECDH("secp256k1");
bobECDH.generateKeys();

let bobPublicKey = bobECDH.getPublicKey(null, "compressed"),
    bobPrivateKey = bobECDH.getPrivateKey(null, "compressed");

console.log("Bob Public:   ", bobPublicKey.length, bobPublicKey.toString("hex"));
console.log("Bob Private:  ", bobPrivateKey.length, bobPrivateKey.toString("hex"));

// On Alice's side
let secret1 = aliceECDH.computeSecret(bobPublicKey);
console.log("Alice Secret: ", secret1.length, secret1.toString("hex"));

// On Bob's side
let secret2 = bobECDH.computeSecret(alicePublicKey);
console.log("Bob Secret:   ", secret2.length, secret2.toString("hex"));

const iocane = require("iocane").crypto;

iocane
    .encryptWithPassword("Hi there, Bob!", secret1)
    .then(function(encrypted) {
        console.log("Encrypted:", encrypted);
        // send to Bob
        iocane
            .decryptWithPassword(encrypted, secret1)
            .then(function(message) {
                console.log("Decrypted:", message);
            });
    });