This node package allows you to parse Rails Cookies
http://kubakuzma.com/2013-04-10-decrypt-rails-4-session.html https://github.com/rails/rails/blob/master/activesupport/lib/active_support/key_generator.rb https://github.com/rails/rails/blob/master/activesupport/lib/active_support/message_encryptor.rb https://github.com/rails/rails/blob/master/activesupport/lib/active_support/message_verifier.rb
http://nodejs.org/api/crypto.html http://nodejs.org/api/buffer.html