gistfile1.txt

module Encryptor
  def encryptor(salt)
    ActiveSupport::MessageEncryptor.new(Digest::SHA1.hexdigest(salt + Configuration.encryption_salt))
  end
end

class Thing
  include Encryptor
  
  def hash_new_key
    self.key_salt = ActiveSupport::SecureRandom.base64(16)
    self.key_hash = encryptor(key_salt).encrypt(@key)
  end

  def unhash_key
    @key = if key_hash.present?
      encryptor(key_salt).decrypt(key_hash)
    else
      nil
    end
  end
end