--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/enigma/lib/enigma_driver.php	Thu Jan 04 15:50:29 2018 -0500
@@ -0,0 +1,142 @@
+<?php
+
+/**
+ +-------------------------------------------------------------------------+
+ | Abstract driver for the Enigma Plugin                                   |
+ |                                                                         |
+ | Copyright (C) 2010-2015 The Roundcube Dev Team                          |
+ |                                                                         |
+ | Licensed under the GNU General Public License version 3 or              |
+ | any later version with exceptions for skins & plugins.                  |
+ | See the README file for a full license statement.                       |
+ |                                                                         |
+ +-------------------------------------------------------------------------+
+ | Author: Aleksander Machniak <alec@alec.pl>                              |
+ +-------------------------------------------------------------------------+
+*/
+
+abstract class enigma_driver
+{
+    /**
+     * Class constructor.
+     *
+     * @param string User name (email address)
+     */
+    abstract function __construct($user);
+
+    /**
+     * Driver initialization.
+     *
+     * @return mixed NULL on success, enigma_error on failure
+     */
+    abstract function init();
+
+    /**
+     * Encryption (and optional signing).
+     *
+     * @param string     Message body
+     * @param array      List of keys (enigma_key objects)
+     * @param enigma_key Optional signing Key ID
+     *
+     * @return mixed Encrypted message or enigma_error on failure
+     */
+    abstract function encrypt($text, $keys, $sign_key = null);
+
+    /**
+     * Decryption (and sig verification if sig exists).
+     *
+     * @param string           Encrypted message
+     * @param array            List of key-password
+     * @param enigma_signature Signature information (if available)
+     *
+     * @return mixed Decrypted message or enigma_error on failure
+     */
+    abstract function decrypt($text, $keys = array(), &$signature = null);
+
+    /**
+     * Signing.
+     *
+     * @param string     Message body
+     * @param enigma_key The signing key
+     * @param int        Signing mode (enigma_engine::SIGN_*)
+     *
+     * @return mixed True on success or enigma_error on failure
+     */
+    abstract function sign($text, $key, $mode = null);
+
+    /**
+     * Signature verification.
+     *
+     * @param string Message body
+     * @param string Signature, if message is of type PGP/MIME and body doesn't contain it
+     *
+     * @return mixed Signature information (enigma_signature) or enigma_error
+     */
+    abstract function verify($text, $signature);
+
+    /**
+     * Key/Cert file import.
+     *
+     * @param string File name or file content
+     * @param bolean True if first argument is a filename
+     * @param array  Optional key => password map
+     *
+     * @return mixed Import status array or enigma_error
+     */
+    abstract function import($content, $isfile = false, $passwords = array());
+
+    /**
+     * Key/Cert export.
+     *
+     * @param string Key ID
+     * @param bool   Include private key
+     * @param array  Optional key => password map
+     *
+     * @return mixed Key content or enigma_error
+     */
+    abstract function export($key, $with_private = false, $passwords = array());
+
+    /**
+     * Keys listing.
+     *
+     * @param string Optional pattern for key ID, user ID or fingerprint
+     *
+     * @return mixed Array of enigma_key objects or enigma_error
+     */
+    abstract function list_keys($pattern = '');
+
+    /**
+     * Single key information.
+     *
+     * @param string Key ID, user ID or fingerprint
+     *
+     * @return mixed Key (enigma_key) object or enigma_error
+     */
+    abstract function get_key($keyid);
+
+    /**
+     * Key pair generation.
+     *
+     * @param array Key/User data (name, email, password, size)
+     *
+     * @return mixed Key (enigma_key) object or enigma_error
+     */
+    abstract function gen_key($data);
+
+    /**
+     * Key deletion.
+     *
+     * @param string Key ID
+     *
+     * @return mixed True on success or enigma_error
+     */
+    abstract function delete_key($keyid);
+
+    /**
+     * Returns a name of the hash algorithm used for the last
+     * signing operation.
+     *
+     * @return string Hash algorithm name e.g. sha1
+     */
+    abstract function signature_algorithm();
+}