Using OAuth to connect to a Windows Azure Active Directory

In the scaffolding for an ASP.NET MVC project, the StartUp.Auth.cs file currently contains this code:

public partial class Startup
{
    // For more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?LinkId=301864
    public void ConfigureAuth(IAppBuilder app)
    {
        // Enable the application to use a cookie to store information for the signed in user
        app.UseCookieAuthentication(new CookieAuthenticationOptions
        {
            AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
            LoginPath = new PathString("/Account/Login")
        });
        // Use a cookie to temporarily store information about a user logging in with a third party login provider
        app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);

        // Uncomment the following lines to enable logging in with third party login providers
        app.UseMicrosoftAccountAuthentication(
            clientId: "0000000000000000",
            clientSecret: "xxxx-xxxxxxxxxxxxxxxxxxx-xxxxxxx");

        //app.UseTwitterAuthentication(
        //   consumerKey: "",
        //   consumerSecret: "");

        //app.UseFacebookAuthentication(
        //   appId: "",
        //   appSecret: "");

        //app.UseGoogleAuthentication();
    }
}

Uncommenting the app.UseXxxAuthentication() lines and adding in your provider's key and secret gives you the ability to use the respective providers to perform OAuth logins. Under the covers, these methods use classes derived from the Owin class AuthenticationMiddleware.

I have looked on the web, but I cannot find a custom implementation of AuthenticationMiddleware that links directly to a Windows Azure Active Directory instance. Are there any such implementations?

Is this the right way to use OAuth to connect to my Windows Azure Active Directory instance?