From 9050e76d955e06a5e5ed9b4b1c444bdf03699ba0 Mon Sep 17 00:00:00 2001
From: Roeland Jago Douma <rullzer@owncloud.com>
Date: Thu, 14 Apr 2016 19:21:18 +0200
Subject: Move \OC\Security to PSR-4

---
 lib/private/Security/SecureRandom.php | 86 +++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 lib/private/Security/SecureRandom.php

(limited to 'lib/private/Security/SecureRandom.php')

diff --git a/lib/private/Security/SecureRandom.php b/lib/private/Security/SecureRandom.php
new file mode 100644
index 00000000000..45cb3f17ee4
--- /dev/null
+++ b/lib/private/Security/SecureRandom.php
@@ -0,0 +1,86 @@
+<?php
+/**
+ * @author Lukas Reschke <lukas@owncloud.com>
+ * @author Morris Jobke <hey@morrisjobke.de>
+ *
+ * @copyright Copyright (c) 2016, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Security;
+
+use RandomLib;
+use Sabre\DAV\Exception;
+use OCP\Security\ISecureRandom;
+
+/**
+ * Class SecureRandom provides a wrapper around the random_int function to generate
+ * secure random strings. For PHP 7 the native CSPRNG is used, older versions do
+ * use a fallback.
+ *
+ * Usage:
+ * \OC::$server->getSecureRandom()->generate(10);
+ * @package OC\Security
+ */
+class SecureRandom implements ISecureRandom {
+	/**
+	 * Convenience method to get a low strength random number generator.
+	 *
+	 * Low Strength should be used anywhere that random strings are needed
+	 * in a non-cryptographical setting. They are not strong enough to be
+	 * used as keys or salts. They are however useful for one-time use tokens.
+	 *
+	 * @deprecated 9.0.0 Use \OC\Security\SecureRandom::generate directly or random_bytes() / random_int()
+	 * @return $this
+	 */
+	public function getLowStrengthGenerator() {
+		return $this;
+	}
+
+	/**
+	 * Convenience method to get a medium strength random number generator.
+	 *
+	 * Medium Strength should be used for most needs of a cryptographic nature.
+	 * They are strong enough to be used as keys and salts. However, they do
+	 * take some time and resources to generate, so they should not be over-used
+	 *
+	 * @deprecated 9.0.0 Use \OC\Security\SecureRandom::generate directly or random_bytes() / random_int()
+	 * @return $this
+	 */
+	public function getMediumStrengthGenerator() {
+		return $this;
+	}
+
+	/**
+	 * Generate a random string of specified length.
+	 * @param int $length The length of the generated string
+	 * @param string $characters An optional list of characters to use if no character list is
+	 * 							specified all valid base64 characters are used.
+	 * @return string
+	 */
+	public function generate($length,
+							 $characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/') {
+		$maxCharIndex = strlen($characters) - 1;
+		$randomString = '';
+
+		while($length > 0) {
+			$randomNumber = \random_int(0, $maxCharIndex);
+			$randomString .= $characters[$randomNumber];
+			$length--;
+		}
+		return $randomString;
+	}
+}
-- 
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