key_generator

# File railties/lib/rails/application.rb, line 153
    def key_generator
      # number of iterations selected based on consultation with the google security
      # team. Details at https://github.com/rails/rails/pull/6952#issuecomment-7661220
      @caching_key_generator ||= begin
        if secrets.secret_key_base
          key_generator = ActiveSupport::KeyGenerator.new(secrets.secret_key_base, iterations: 1000)
          ActiveSupport::CachingKeyGenerator.new(key_generator)
        else
          ActiveSupport::LegacyKeyGenerator.new(config.secret_token)
        end
      end
    end