We have a simple sister site to our DNN portal - it is PHP.

From this PHP site, we need to be able to have one of our users enter in their username/password, check the DNN database, and return a true or false that they are a validated member in a particular role.  There isn't a membership provider on the PHP site,,,,,

I have been searching for a simple way to accomplish this, but am having no luck - he just wants to pass in the username/password (and an encryption key if needed),,,,,  I can't find any stored proc in the database that validates users - anyone know where I should look?  or if this is even possible?  I have been scouring around the web searching for anything, but have come up empty for something this simple.

As always,,, thanks.