/**
  * listener which gets invoked if password is changed within owncloud
  *
  * @param unknown $params
  *            userdata
  */
 public static function changePasswordListener($params)
 {
     $username = $params['uid'];
     $password = $params['password'];
     // Try to fetch from session
     $oldPrivKey = OC_RoundCube_App::getSessionVariable(OC_RoundCube_App::SESSION_ATTR_RCPRIVKEY);
     // Take the chance to alter the priv/pubkey pair
     OC_RoundCube_App::generateKeyPair($username, $password);
     $privKey = OC_RoundCube_App::getPrivateKey($username, $password);
     $pubKey = OC_RoundCube_App::getPublicKey($username);
     if ($oldPrivKey !== false) {
         // Fetch credentials from data-base
         $mail_userdata_entries = OC_RoundCube_App::checkLoginData($username);
         foreach ($mail_userdata_entries as $mail_userdata) {
             $mail_username = OC_RoundCube_App::decryptMyEntry($mail_userdata['mail_user'], $oldPrivKey);
             $mail_password = OC_RoundCube_App::decryptMyEntry($mail_userdata['mail_password'], $oldPrivKey);
             OC_RoundCube_App::cryptEmailIdentity($username, $mail_username, $mail_password);
             OCP\Util::writeLog('roundcube', 'OC_RoundCube_AuthHelper.class.php->changePasswordListener():' . 'Updated mail password data due to password changed for user ' . $username, OCP\Util::DEBUG);
         }
     } else {
         OCP\Util::writeLog('roundcube', 'OC_RoundCube_AuthHelper.class.php->changePasswordListener():' . 'No private key for ' . $username, OCP\Util::DEBUG);
     }
 }