[feature/passwords] Add crypto driver base class and interface

PHPBB3-11610

phpBB/includes/crypto/driver/base.php

@@ -0,0 +1,43 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2013 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+/**
+* @ignore
+*/
+if (!defined('IN_PHPBB'))
+{
+	exit;
+}
+
+/**
+* @package crypto
+*/
+abstract class phpbb_crypto_driver_base implements phpbb_crypto_driver_interface
+{
+	/** @var phpbb_config */
+	protected $config;
+
+	/**
+	* Constructor of crypto driver object
+	*
+	* @return string	Hash prefix
+	*/
+	public function __construct(phpbb_config $config)
+	{
+		$this->config = $config;
+	}
+
+	/**
+	* @inheritdoc
+	*/
+	public function is_supported()
+	{
+		return true;
+	}
+}