- Added new CI config file application/config/db_crypt.php, it is loaded by core/DB_Model

- Added new constant ENCRYPTION_PASSWORDS to application/core/DB_Model.php
- Added new protected properties passwordName and encryptedColumns to core/DB_Model
- Added new private methods _isCryptoEnabledAndValid, _getCipher, _encrypt and _decrypt to core/DB_Model
- core/DB_Model properties insert and update now are making use of _encrypt()
- core/DB_Model properties loadWhere and loadTree now are making use of _decrypt()

application/config/db_crypt.php

@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * Copyright (C) 2023 fhcomplete.org
+ *
+ * This program is free software: you can redistribute it and/or modify   
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+if (!defined('BASEPATH')) exit('No direct script access allowed');
+
+// NOTE: if database encryption is _not_ used then leave this array empty!
+$config['encryption_passwords'] = array();
+