I have this old MVC5 application that uses forms authentication in the simplest possible form. There is only one account stored in web.config, there are no roles etc.
<authentication mode="Forms">
<forms loginUrl="~/Login/Index" timeout="30">
<credentials passwordFormat="Clear">
<user name="some-user" password="some-password" />
</credentials>
</forms>
</authentication>
The login routine just calls
FormsAuthentication.Authenticate(name, password);
And that's it. Is there something similar (in terms of simplicity) in asp.net core?