Source can be found at
this part of sourceforge. While I'm pretty sure Vector currently uses wpa_supplicant, as far as I know it doesn't support WPA2 or, for example, PEAP authentication. For anyone looking to use Vector in an enterprise environment, this lack of secured and authenticated wireless access could be a deal breaker.
Some of you may know of my recent struggles trying to get this to compile - for those that don't, thread is
here. I admit, I don't know what else I can do to get it to work, so I turn it over to the far more experienced folk of this forum.
EDIT: Turns out I was talking out of a part of my anatomy better suited for sitting on - wpa_supplicant has the full feature set. I simply fail at google.