# File lib/action_controller/metal/http_authentication.rb, line 278
      def nonce(secret_key, time = Time.now)
        t = time.to_i
        hashed = [t, secret_key]
        digest = ::Digest::MD5.hexdigest(hashed.join(":"))
        ActiveSupport::Base64.encode64("#{t}:#{digest}").gsub("\n", '')
      end