forUnKnownHandler example

if ($config) {
            $this->key    = $config->key;
            $this->driver = $config->driver;
            $this->digest = $config->digest ?? 'SHA512';
        }

        if (empty($this->driver)) {
            throw EncryptionException::forNoDriverRequested();
        }

        if (! in_array($this->driver, $this->drivers, true)) {
            throw EncryptionException::forUnKnownHandler($this->driver);
        }

        if (empty($this->key)) {
            throw EncryptionException::forNeedsStarterKey();
        }

        $this->hmacKey = bin2hex(\hash_hkdf($this->digest, $this->key));

        $handlerName     = 'CodeIgniter\\Encryption\\Handlers\\' . $this->driver . 'Handler';
        $this->encrypter = new $handlerName($config);