Gcrypt.h

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/* Copyright 2013-2019 Homegear GmbH
 *
 * libhomegear-base is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * libhomegear-base 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with libhomegear-base.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU Lesser General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
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*/

#ifndef BASELIB_SECURITY_GCRYPT_H_
#define BASELIB_SECURITY_GCRYPT_H_

#include "../Exception.h"
#include <gcrypt.h>

#include <memory>
#include <vector>
#include <cstdint>

namespace BaseLib
{
namespace Security
{

class GcryptException : public Exception
{
public:
    explicit GcryptException(const std::string& message) : Exception(message) {}
};

class Gcrypt
{
private:
    bool _keySet = false;

    int _algorithm = 0;

    int _mode = 0;

    unsigned int _flags = 0;

    gcry_cipher_hd_t _handle = nullptr;

public:
    Gcrypt(int algorithm, int mode, unsigned int flags);

    virtual ~Gcrypt();

    void reset();

    gcry_cipher_hd_t getHandle() { return _handle; };

    static std::string getError(int32_t errorCode);

    size_t getBlockSize();

    template<typename Data> void setIv(const Data& iv);

    void setIv(const void* iv, const size_t length);

    template<typename Data> void setCounter(const Data& counter);

    void setCounter(const void* counter, const size_t length);

    template<typename Data> void setKey(const Data& key);

    void setKey(const void* key, const size_t length);

    void encrypt(void* out, const size_t outLength, const void* in, const size_t inLength);

    template<typename DataOut, typename DataIn> void encrypt(DataOut& out, const DataIn& in);

    void decrypt(void* out, const size_t outLength, const void* in, const size_t inLength);

    template<typename DataOut, typename DataIn> void decrypt(DataOut& out, const DataIn& in);

    bool authenticate(const void* in, const size_t inLength);

    template<typename DataIn> bool authenticate(const DataIn& in);
};

typedef std::shared_ptr<Gcrypt> PGcrypt;

}
}
#endif