    # 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