Encrypt messages with ECIES

messageEncryption.js

import decode from 'jwt-decode';
import jwt from 'njwt';
import { ec } from 'elliptic';

var eccrypto = require('eccrypto');
var crypto = require('crypto');

// sender
var privKey1 = crypto.randomBytes(32);
var pubKey1 = eccrypto.getPublic(privKey1);

// recipient
var privKey2 = crypto.randomBytes(32);
var pubKey2 = eccrypto.getPublic(privKey2);

// create web token of JSON content
var message = "Hello world";
var token = njwt.create({ message }, 'HS512').compact();

// encrypto token and send to recipient
eccrypto.encrypt(pubKey2, Buffer(token)).then(function(encrypted) {
  console.log('> Encrypted message: ', encrypted);
  
  // decrypt from recipient end 
  eccrypto.decrypt(privKey2, encrypted).then(function(content) {
    console.log('> Decrypted message: ', content);
    // decode web token
    var decoded = decode(content);
    console.log('> Decoded token: ', decoded);
  });
});