How does VBulletin hash its passwords?

[Siraris]

I am curious how Vbulletin gets its password (is it through MD5 with salt?). The reason I am asking is, I want to have it so that when someone registers on my main site, I insert the account into the vbulletin user table as well, so that they don't have to register twice on my site and the forum as well. I inserted a straight record, and copied the MD5 hash as the PW, but when I entered the PW on vbulletin, it didn't login (even though it did on my main site).

Is this something very difficult to do, and can anyone help me with the process?

Also, so I don't have to post a second thread, how does it do the date in the user table? Under join date, I see this number: 1209845112 which makes no sense to me as to what it represents. I'd like to insert the correct date that they joined as well, and not have to just insert some wacky number each time