[rake]

or you could just use the same if vbulletin uses for checking login information:

taken from function_login.php, verify_authentication function:

if (
$bbuserinfo['password'] != iif($password AND !$md5password, md5(md5($password) . $bbuserinfo['salt']), '') AND
$bbuserinfo['password'] != md5($md5password . $bbuserinfo['salt']) AND
$bbuserinfo['password'] != iif($md5password_utf, md5($md5password_utf . $bbuserinfo['salt']), '')
)