[Opserty]

For a logged in user:

PHP Code:

$user['securitytoken_raw'] = sha1($user['userid'] . sha1($user['salt']) . sha1(COOKIE_SALT));
$user['securitytoken'] = TIMENOW . '-' . sha1(TIMENOW . $user['securitytoken_raw']); 


For a guest:

PHP Code:

'securitytoken'  => TIMENOW . '-' . sha1(TIMENOW . sha1(sha1(COOKIE_SALT) . USER_AGENT)),
'securitytoken_raw'  => sha1(sha1(COOKIE_SALT) . USER_AGENT) 


You'll have to search the vBulletin PHP files for COOKIE_SALT, I can't seem to find it when I looked.