rails crypt lib - SSL aes 256 cbc

crypt.rb

require 'openssl'
require "base64"

class Crypt
  def self.sha1(str)
    Digest::SHA1.hexdigest str.to_s
  end

  def self.cipher(mode, data, key='')
    cipher = OpenSSL::Cipher::Cipher.new('aes-256-cbc').send(mode)
    cipher.key = Digest::SHA512.digest(ActionController::Base.cookie_verifier_secret+key)
    cipher.update(data.to_s) << cipher.final
  end

  def self.encrypt(data,key='')
    Base64.encode64(cipher(:encrypt, data, key)).chomp
  end

  def self.decrypt(text, key='')
    cipher(:decrypt, Base64.decode64(text), key)
  end
end

# CloudFlare "aware" IP get
class ActionController::Request
  def encrypt(data)
    Crypt.encrypt(data, (headers["CF-Connecting-IP"] || remote_ip))      
  end

  def decrypt(text)
    Crypt.decrypt(text, (headers["CF-Connecting-IP"] || remote_ip))
  end
end