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system/Encryption/Handlers/BaseHandler.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Encryption\Handlers;
+
+use CodeIgniter\Encryption\EncrypterInterface;
+use Config\Encryption;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Base class for encryption handling
+ */
+abstract class BaseHandler implements EncrypterInterface
+{
+    /**
+     * Logger instance to record error messages and warnings.
+     *
+     * @var LoggerInterface
+     */
+    protected $logger;
+
+    /**
+     * Constructor
+     */
+    public function __construct(?Encryption $config = null)
+    {
+        $config = $config ?? config('Encryption');
+
+        // make the parameters conveniently accessible
+        foreach (get_object_vars($config) as $key => $value) {
+            if (property_exists($this, $key)) {
+                $this->{$key} = $value;
+            }
+        }
+    }
+
+    /**
+     * Byte-safe substr()
+     *
+     * @param string $str
+     * @param int    $start
+     * @param int    $length
+     *
+     * @return string
+     */
+    protected static function substr($str, $start, $length = null)
+    {
+        return mb_substr($str, $start, $length, '8bit');
+    }
+
+    /**
+     * __get() magic, providing readonly access to some of our properties
+     *
+     * @param string $key Property name
+     *
+     * @return mixed
+     */
+    public function __get($key)
+    {
+        if ($this->__isset($key)) {
+            return $this->{$key};
+        }
+
+        return null;
+    }
+
+    /**
+     * __isset() magic, providing checking for some of our properties
+     *
+     * @param string $key Property name
+     */
+    public function __isset($key): bool
+    {
+        return property_exists($this, $key);
+    }
+}