Creates an encrypted, base64 encoded url containing signup form parameters. Used for database-less email verification.

gistfile1.rb

class UsersController < ApplicationController
  # Creates an encrypted, base64 encoded url. http://localhost/confirm?_=hBRCGVqie5PetQhjiagq9F6kmi7luVxpcpEYMWaxrtSHIPA3rF0Hufy6EgiH%0A%2BL3t9dcgV9es9Zywkl4F1lcMyA%3D%3D%0A
    @to_encrypt = save_space(params[:user], {:firstname => :fn,:lastname => :ln,:email => :el,:username => :un,:password => :pd})
    
    encrypted_params = CGI::escape(Base64.encode64(encrypt(Marshal.dump(@to_encrypt), "secret")))
    
    render :text => "#{encrypted_params}"
  
  def confirm
    @decrypted = Marshal.load(decrypt(Base64.decode64(params[:_]), "secret"))
    
    @data = unsave_space(@decrypted, {:firstname => :fn,:lastname => :ln,:email => :el,:username => :un,:password => :pd})
    
    render :text => "#{@data}"
  end

  private
  
  def save_space(input,hash)
    @output = Hash.new
    hash.each {|k,v| @output[v] = input[k]}
    @output
  end
  
  def unsave_space(input,hash)
    output = Hash.new
    hash.each {|k,v| output[k] = input[v]}
    output
  end

  def aes(m,t,k)
    (aes = OpenSSL::Cipher::Cipher.new('aes-256-cbc').send(m)).key = Digest::SHA256.digest(k)
    aes.update(t) << aes.final
  end

  def encrypt(text, key)
    aes(:encrypt, text, key)
  end

  def decrypt(text, key)
    aes(:decrypt, text, key)
  end