/* -*- 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 .
 */

#ifndef INCLUDED_OOX_CRYPTO_CRYPTTOOLS_HXX
#define INCLUDED_OOX_CRYPTO_CRYPTTOOLS_HXX

#include <oox/dllapi.h>
#include <sal/types.h>

#include <vector>
#include <memory>

namespace oox::crypto {

/** Rounds up the input to the nearest multiple
 *
 *  For example:
 *  input  1, multiple 16 = 16
 *  input 16, multiple 16 = 16
 *  input 17, multiple 16 = 32
 *  input 31, multiple 16 = 32
 */
template<typename T>
T roundUp(T input, T multiple)
{
    if (input % multiple == 0)
        return input;
    return ((input / multiple) * multiple) + multiple;
}

enum class CryptoHashType
{
    SHA1,
    SHA256,
    SHA384,
    SHA512
};

struct CryptoImpl;

class OOX_DLLPUBLIC Crypto
{
public:
    enum CryptoType
    {
        UNKNOWN,
        AES_128_ECB,
        AES_128_CBC,
        AES_256_CBC,
    };

protected:
    std::unique_ptr<CryptoImpl> mpImpl;

protected:
    Crypto();

public:
    virtual ~Crypto();
};

class Decrypt final : public Crypto
{
public:
    Decrypt(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, CryptoType type);

    sal_uInt32 update(
                    std::vector<sal_uInt8>& output,
                    std::vector<sal_uInt8>& input,
                    sal_uInt32 inputLength = 0);


    static sal_uInt32 aes128ecb(
                    std::vector<sal_uInt8>& output,
                    std::vector<sal_uInt8>& input,
                    std::vector<sal_uInt8>& key );

};

class Encrypt final : public Crypto
{
public:
    Encrypt(std::vector<sal_uInt8>& key, std::vector<sal_uInt8>& iv, CryptoType type);

    sal_uInt32 update(
                    std::vector<sal_uInt8>& output,
                    std::vector<sal_uInt8>& input,
                    sal_uInt32 inputLength = 0);
};

class OOX_DLLPUBLIC CryptoHash final : public Crypto
{
    sal_Int32 mnHashSize;
public:
    CryptoHash(std::vector<sal_uInt8>& rKey, CryptoHashType eType);
    bool update(std::vector<sal_uInt8>& rInput, sal_uInt32 nInputLength = 0);
    std::vector<sal_uInt8> finalize();
};


} // namespace oox::crypto

#endif

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