/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */


module com {  module sun {  module star {  module packages {


/** Allows to transparently plug-in crypto for PackageStreams.

    @since LibreOffice 7.0
 */
interface XPackageEncryption: com::sun::star::uno::XInterface
{
    /** Read package crypto information

        @param rStreams
        Substreams of the package (in the case of MS encryption, those
        are OLE substorage streams).

        @returns
        True if crypto info could be retrieved, and engine initialised. False otherwise.
     */
    boolean readEncryptionInfo([in] sequence < com::sun::star::beans::NamedValue > rStreams);

    /** Set or refresh encryption key

        @param rPassword
        Optional password to use for generating encryption key.

        @returns
        True if key setup was successful. False otherwise.
     */
    boolean generateEncryptionKey([in] string rPassword);

    /** Decrypt document content

        After crypto setup via readEncryptionInfo(), pipe package bits through
        encryption engine.

        @param rxInputStream
        Input data (encrypted)

        @param rxOutputStream
        Output data (decrypted)

        @returns
        True if decryption finished without error. False otherwise.
     */
    boolean decrypt([in] com::sun::star::io::XInputStream rxInputStream,
                    [out] com::sun::star::io::XOutputStream rxOutputStream);

    /** Create key-value list of encryption meta data

        After generateEncryptionKey() succeeded in setting up crypto,
        use this method to create requisite meta data. Depending on
        underlying crypto, this can be a salt, init vector, or other
        algorithm-specific information that needs to be stored
        alongside an encrypted document

        @param rPassword
        Same password as provided to generateEncryptionKey

        @returns
        Sequence of opaque key-value pairs needed for decrypting this
        setup. Can be passed back into other instances of this service
        via setupEncryption()
     */
    sequence<com::sun::star::beans::NamedValue> createEncryptionData([in] string rPassword);

    /** Set key-value list of encryption meta data

        Use this method to setup requisite encryption meta
        data. Depending on the underlying crypto, this can be a salt, init
        vector, or other algorithm-specific information that needs to
        be stored alongside an encrypted document

        @returns
        True if encryption algo setup finished without error. False otherwise.
     */
    boolean setupEncryption([in] sequence<com::sun::star::beans::NamedValue> rMediaEncData);

    /** Encrypt given stream

        After setting up crypto via setupEncryption(), use this method to encrypt content.

        @returns
        Sequence of named output streams, specific to the crypto
        provider. The names of sequence entry denote the substream
        identifiers, if any. In the case of MS OLE storage, it's the
        substorage names.
     */
    sequence<com::sun::star::beans::NamedValue> encrypt([in] com::sun::star::io::XInputStream rxInputStream);

    /** Check if decryption meta data is valid

        Some implementations might for example check HMAC values
        here. Call this before trusting encrypted data.

        @returns
        True if decryption algo setup finished without error and
        consistency checks have passed. False otherwise.
     */
    boolean checkDataIntegrity();
};


}; }; }; };

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