change random string library because of deprecated code in old one

composer.json

@@ -35,7 +35,7 @@
     "oxid-esales/oxideshop-metapackage-ce": "~6.0.3 || ~6.1.0",
     "spomky-labs/otphp": "^8.3",
     "bacon/bacon-qr-code": "^1.0",
-    "ircmaxell/random-lib": "^1.2"
+    "zendframework/zend-math": "^3.2"
   },
   "autoload": {
     "psr-4": {

src/Application/Model/d3RandomGenerator.php

@@ -0,0 +1,27 @@
+<?php
+
+
+namespace D3\Totp\Application\Model;
+
+use Zend\Math\Rand;
+
+class d3RandomGenerator extends Rand
+{
+    const CHAR_UPPER     = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
+    const CHAR_LOWER     = 'abcdefghijklmnopqrstuvwxyz';
+    const CHAR_DIGITS    = '0123456789';
+    const CHAR_UPPER_HEX = 'ABCDEF';
+    const CHAR_LOWER_HEX = 'abcdef';
+    const CHAR_BASE64    = '+/';
+    const CHAR_SYMBOLS   = '!"#$%&\'()* +,-./:;<=>?@[\]^_`{|}~';
+    const CHAR_BRACKETS  = '()[]{}<>';
+    const CHAR_PUNCT     = ',.;:';
+
+    /**
+     * @return string
+     */
+    public static function getRandomTotpBackupCode()
+    {
+        return self::getString(6, self::CHAR_DIGITS);
+    }
+}

src/Application/Model/d3backupcode.php

@@ -34,10 +34,8 @@ class d3backupcode extends BaseModel
      */
     public function generateCode($sUserId)
     {
-        $factory = new Factory();
+        $sCode = d3RandomGenerator::getRandomTotpBackupCode();
-        $generator = $factory->getLowStrengthGenerator();
 
-        $sCode = $generator->generateString(6, Generator::CHAR_DIGITS);
         $this->assign(
             [
                 'oxuserid'    => $sUserId,