crypto_asym.hpp

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//*********************************************************************/
// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2025 Denis Corbin
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// to contact the author, see the AUTHOR file
/*********************************************************************/
 
 
#ifndef CRYPTO_ASYM_HPP
#define CRYPTO_ASYM_HPP
 
extern "C"
{
#if HAVE_GPGME_H
#include <gpgme.h>
#endif
}
 
#include "../my_config.h"
#include "generic_file.hpp"
#include "mem_ui.hpp"
#include "crypto.hpp"
 
#include <list>
 
namespace libdar
{
 
 
    class crypto_asym : public mem_ui
    {
    public:
 
    crypto_asym(const std::shared_ptr<user_interaction> & ui) : mem_ui(ui) { build_context(); has_signatories = false; };
 
    crypto_asym(const crypto_asym & ref) = delete;
 
    crypto_asym(crypto_asym && ref) = delete;
 
    crypto_asym & operator = (const crypto_asym & ref) = delete;
 
    crypto_asym & operator = (crypto_asym && ref) = delete;
 
    ~crypto_asym() { release_context(); };
 
 
    void set_signatories(const std::vector<std::string> & signatories);
 
 
    void encrypt(const std::vector<std::string> & recipients_email, generic_file & clear, generic_file & ciphered);
 
 
    void decrypt(generic_file & ciphered, generic_file & clear);
 
    const std::list<signator> & verify() const { return signing_result; };
 
 
    user_interaction & get_ui() const { return mem_ui::get_ui(); };
 
    private:
    bool has_signatories;
    std::list<signator> signing_result;
#if GPGME_SUPPORT
    gpgme_ctx_t context;                     
 
    void release_context() { gpgme_release(context); };
    void build_key_list(const std::vector<std::string> & recipients_email,  
                gpgme_key_t * & ciphering_keys,                     
                bool signatories                                    
        );
    void release_key_list(gpgme_key_t * & ciphering_keys);
    void fill_signing_result();
#else
    void release_context() {};
#endif
 
    void build_context();
    };
 
 
} // end of namespace
 
#endif