added additional params for the activate method, allowing to validate against password if needed.

@@ -163,7 +163,7 @@ function register($username, $email, $password, $meta = Array()) {
  * @global $wpdb
  * @see wpmu_activate_signup
  */
-function activate($key) {
+function activate($key, $validate_against_password = false, $pass = '') {
     global $wpdb, $current_blog;
     $signup = $wpdb->get_row($wpdb->prepare("SELECT * FROM {$wpdb->signups} WHERE activation_key = %s", $key));
 
@@ -179,6 +179,15 @@ function activate($key) {
 
     // Do I need to re-sanatize this?
     $meta = unserialize($signup->meta);
+    
+    
+    if ($validate_against_password) {
+        if ($meta['password'] != $pass) {
+            throw new Exception('Bad password match');
+        }
+    }
+    
+    
     $id = _create_user($signup->user_login, $meta['password'], $signup->user_email);
     unset($meta['password']);