Challenge derivation test

browser.js

// include CryptoJS

var message = '12345678901234567890123456789012';
var iv = CryptoJS.enc.Utf8.parse('1234567890123456');
var challengeKey = 'fe8844b73775265aef8839bf39de68a5aec6b0f447034472e8ff937bd9046e91';
var key = CryptoJS.enc.Hex.parse(challengeKey);

var challenge = CryptoJS.AES.encrypt(message, key, {
  mode: CryptoJS.mode.CFB,
  iv: iv
}).ciphertext.toString();

var decrypted = CryptoJS.AES.decrypt(challenge, key, {
  mode: CryptoJS.mode.CFB,
  iv: iv
}).toString();

console.log(challenge);
// f4c445b91f04ee1c2bed0d84396470a2be086d624012b000ec69496dca47f62ba6b305f693545a2785533091bfb54f76
// length: 96

console.log(decrypted);
// length: 0

node.js

var crypto = require('crypto');

var message = new Buffer('12345678901234567890123456789012', 'utf8');
var iv = new Buffer('1234567890123456', 'utf8');
var challengeKey = 'fe8844b73775265aef8839bf39de68a5aec6b0f447034472e8ff937bd9046e91';
var key = new Buffer(challengeKey, 'hex');

var challengeCipher = crypto.createCipheriv('aes-256-cfb', key, iv);
var challenge = challengeCipher.update(message, 'utf8', 'hex');

console.log(challenge);
// ec022879aca6b53bc73d3a4d3a8ad1e2feb2e27d8c237384d4713504952b9fdd
// length: 64