I am working on a web app that needs to integrate with an existing user database. I would still like to use the `[Authorize]` attributes, but I don't want to use the Identity framework. If I did want to use the Identity framework I would add something like this in the startup.cs file:

```
services.AddIdentity<ApplicationUser, IdentityRole>(options =>
{
    options.Password.RequireNonLetterOrDigit = false;
}).AddEntityFrameworkStores<ApplicationDbContext>()
  .AddDefaultTokenProviders();

```

I'm assuming I have to add something else there, and then create some kind of class that implements a specific interface? Can somebody point me in the right direction? I'm using RC1 of of asp.net 5 right now.