# File lib/openid/filestore.rb, line 79
    def get_auth_key
      auth_key = read_auth_key
      if auth_key.nil?
        auth_key = create_auth_key
      end
      
      if auth_key.length != @@AUTH_KEY_LEN
        raise StandardError.new("Bad auth key - wrong length")
      end
      
      auth_key
    end