keymanager class for basic operations to store and retrieve keys

apps/files_encryption/lib/keymanager.php

+<?php
+/**
+ * ownCloud
+ *
+ * @author Bjoern Schiessle
+ * @copyright 2012 Bjoern Schiessle <schiessle@owncloud.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or any later version.
+ *
+ * This library 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 along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA_Encryption;
+
+/*
+ * This class provides basic operations to read/write encryption keys from/to the filesystem 
+ */
+class Keymanager {
+	
+	
+	/*
+	 * @brief retrieve private key from a user
+	 * 
+	 * @param string user name
+	 * @return string private key or false
+	 */
+	public static function getPrivateKey($user) {
+		$privateKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/'.$user.'/files_encryption/';
+		$view = new \OC_FilesystemView($privateKeyStorage);
+		return $view->file_get_contents($user.'.private.key');
+	}
+	
+	/*
+	 * @brief retrieve public key from a user
+	 *
+	 * @param string user name
+	 * @return string private key or false
+	 */
+	public static function getPublicKey($user) {
+		$publicKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/public-keys/';
+		$view = $view = new \OC_FilesystemView($publicKeyStorage);
+		return $view->file_get_contents($user.'.public.key');
+	}
+	
+	/*
+	 * @brief retrieve file encryption key
+	 *
+	 * @param string file name
+	 * @param string user name of the file owner
+	 * @return string file key or false
+	 */
+	public static function getFileKey($user, $file) {
+		$fileKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/'.$user.'/files_encryption/keyfiles/';
+		$view = new \OC_FilesystemView($fileKeyStorage);
+		return $view->file_get_contents($file.'.key');
+	}	
+	
+	/*
+	 * @brief store private key from a user
+	 *
+	 * @param string user name
+	 * @param string key
+	 * @return bool true/false
+	 */
+	public static function setPrivateKey($user, $key) {
+		$privateKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/'.$user.'/files_encryption/';
+		$view = new \OC_FilesystemView($privateKeyStorage);
+		return $view->file_put_contents($user.'.private.key', $key);
+	}
+	
+	
+	/*
+	 * @brief store public key from a user
+	 *
+	 * @param string user name
+	 * @param string key
+	 * @return bool true/false
+	 */
+	public static function setPublicKey($user, $key) {
+		$publicKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/public-keys/';
+		$view = new \OC_FilesystemView($publicKeyStorage);
+		return $view->file_put_contents($user.'.public.key', $key);
+	}
+	
+	/*
+	 * @brief store file encryption key
+	 *
+	 * @param string user name of the file owner
+	 * @param string file name
+	 * @param string key
+	 * @return bool true/false
+	 */
+	public static function setFileKey($user, $file, $key) {
+		$fileKeyStorage =  \OCP\Config::getSystemValue('datadirectory').'/'.$user.'/files_encryption/keyfiles/';
+		$view = new \OC_FilesystemView($fileKeyStorage);
+		return $view->file_put_contents($file.'.key', $key);
+	
+	}
+	
+}
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