An example of creating a UserVoice SSO token using cryptojs

readme.md

Cryptojs is hosted on Google Code. There is an npm module with source on Github.

uv_sso.js

var Crypto = require('cryptojs').Crypto,
    UserVoiceAccountKey = "YOUR_ACCOUNT_KEY",
    UserVoiceAPIKey = "YOUR_API_KEY";

function createUserVoiceSSOToken(data) {
  var key = Crypto.SHA1(UserVoiceAPIKey+UserVoiceAccountKey, {asBytes: true}).slice(0, 16),
      json = JSON.stringify(data),
      encrypted = Crypto.AES.encrypt(json, key, {mode:new Crypto.mode.CBC(Crypto.pad.pkcs7), iv:'OpenSSL for Ruby', asBytes:true}),
      base64 = Crypto.util.bytesToBase64(encrypted),
      uriEncoded = encodeURIComponent(base64);
  return uriEncoded;
}