# File lib/chef/encrypted_data_bag_item.rb, line 137
      def assert_valid_cipher!
        # In the future, chef may support configurable ciphers. For now, only
        # aes-256-cbc is supported.
        requested_cipher = @encrypted_data["cipher"]
        unless requested_cipher == ALGORITHM
          raise UnsupportedCipher,
            "Cipher '#{requested_cipher}' is not supported by this version of Chef. Available ciphers: ['#{ALGORITHM}']"
        end
      end