//*********************************************************************/
// dar - disk archive - a backup/restoration program
// Copyright (C) 2002-2022 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
/*********************************************************************/

    /// \file crypto.hpp
    /// \brief the crypto algoritm definition
    /// \ingroup API

#ifndef CRYPTO_HPP
#define CRYPTO_HPP

extern "C"
{

}

#include "/usr/pkg/include/dar/libdar_my_config.h"
#include <string>

#include "/usr/pkg/include/dar/datetime.hpp"

#include <list>

namespace libdar
{

	/// \addtogroup API
	/// @{

	/// the different cypher available for encryption (strong or weak)

    enum class crypto_algo
    {
	none,          ///< no encryption
	scrambling,    ///< scrambling weak encryption
	blowfish,      ///< blowfish strong encryption
	aes256,        ///< AES 256 strong encryption
	twofish256,    ///< twofish 256 strong encryption
	serpent256,    ///< serpent 256 strong encryption
	camellia256    ///< camellia 256 strong encryption
    };

	/// signator status

    struct signator
    {
	enum result_t
	{
	    good,         //< good signature
	    bad,          //< key correct bug signature tempered
	    unknown_key,  //< no key found to check the signature
	    error         //< signature failed to be checked for other error
	};
	enum key_validity_t
	{
	    valid,        //< the key we have is neither expired nor revoked
	    expired,      //< the key we have has expired
	    revoked       //< the key we have has been revoked
	};
	key_validity_t key_validity; //< validity of the key used to verify the signature
	result_t result;         //< status of the signing
	std::string fingerprint; //< fingerprint of the key
	datetime signing_date;   //< date of signature
	datetime signature_expiration_date; //< date of expiration of this signature
	bool operator < (const signator & ref) const { return fingerprint < ref.fingerprint; };
	bool operator == (const signator & ref) const { return result == ref.result && key_validity == ref.key_validity && fingerprint == ref.fingerprint && signature_expiration_date == ref.signature_expiration_date; };
    };

	/// convert crypto algo to readable std::string
    extern std::string crypto_algo_2_string(crypto_algo algo);

	/// convert crypto algo to char
    extern char crypto_algo_2_char(crypto_algo a);

	/// convert char to crypto algo
    extern crypto_algo char_2_crypto_algo(char a);


	/// return whether the two signators lists match
    extern bool same_signatories(const std::list<signator> & a, const std::list<signator> & b);

	/// @}

} // end of namespace

#endif
