Safe

A wrapper around strongbox to store and encrypt data.

Setup

Install strongbox and safe

config.gem "spikex-strongbox", :lib => "strongbox", :source => "http://gems.github.com"
config.gem "bitzesty-safe", :lib => "safe", :source => "http://gems.github.com"

rake gems:install
rake gems:unpack

Generate a migration with script/generate migration CreateSafeCabinet and add the following

class CreateSafeCabinet < ActiveRecord::Migration
  def self.up
    create_table :safe_cabinets, :force => true do |t|
      t.binary :data
      t.binary :data_key
      t.binary :data_iv
      t.integer :encryptable_id
      t.string :encryptable_type
      t.timestamps
    end
    add_index :safe_cabinets, [:encryptable_id, :encryptable_type]
  end

  def self.down
    drop_table :safe_cabinet
  end
end

In your model that you want to store the encrypted data add:

class MyModel
  include Safe::Keys
  attr_accessor :password #length must be > 3  
  has_many :safe_cabinets, :as => :encryptable #or has_one
  after_create :make_keys!
end

Make sure you are not logging the data/password by adding the following in your ApplicationController

filter_parameter_logging :data
filter_parameter_logging :password

N.B. A password must be used when creating an instance of MyModel.

To create and use safe_cabinets:

m = MyModel.create(:password => "1234")
c = m.safe_cabinets.new
c.data = "super secret data"
c.save

c.data
=> #<Strongbox::Lock:0x1f372d...

c.data.read_data("1234")
=> "super secret data"

Copyright (c) 2009 Matthew Ford and Bit Zesty Ltd, See LICENSE for details.