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diff --git a/lib/public/encryption/imanager.php b/lib/public/encryption/imanager.php
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+<?php
+
+/**
+ * ownCloud - manage encryption modules
+ *
+ * @copyright (C) 2015 ownCloud, Inc.
+ *
+ * @author 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 OCP\Encryption;
+//
+// TODO: move exceptions to OCP
+//
+use OC\Encryption\Exceptions\ModuleDoesNotExistsException;
+use OC\Encryption\Exceptions\ModuleAlreadyExistsException;
+
+/**
+ * This class provides access to files encryption apps.
+ *
+ */
+interface IManager {
+
+	/**
+	 * Check if encryption is available (at least one encryption module needs to be enabled)
+	 *
+	 * @return bool true if enabled, false if not
+	 */
+	function isEnabled();
+
+	/**
+	 * Registers an encryption module
+	 *
+	 * @param IEncryptionModule $module
+	 * @throws ModuleAlreadyExistsException
+	 */
+	function registerEncryptionModule(IEncryptionModule $module);
+
+	/**
+	 * Unregisters an encryption module
+	 *
+	 * @param IEncryptionModule $module
+	 */
+	function unregisterEncryptionModule(IEncryptionModule $module);
+
+	/**
+	 * get a list of all encryption modules
+	 *
+	 * @return array
+	 */
+	function getEncryptionModules();
+
+
+	/**
+	 * get a specific encryption module
+	 *
+	 * @param string $moduleId
+	 * @return IEncryptionModule
+	 * @throws ModuleDoesNotExistsException
+	 */
+	function getEncryptionModule($moduleId);
+
+	/**
+	 * get default encryption module
+	 *
+	 * @return \OCP\Encryption\IEncryptionModule
+	 * @throws Exceptions\ModuleDoesNotExistsException
+	 */
+	public function getDefaultEncryptionModule();
+
+	/**
+	 * set default encryption module Id
+	 *
+	 * @param string $moduleId
+	 * @return string
+	 */
+	public function setDefaultEncryptionModule($moduleId);
+
+}