lime_settings.hpp

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/*
    lime_settings.hpp
    @author Johan Pascal
    @copyright  Copyright (C) 2017  Belledonne Communications SARL

    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 3 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, see <http://www.gnu.org/licenses/>.
*/

#ifndef lime_settings_hpp
#define lime_settings_hpp


namespace lime {
namespace settings {

/******************************************************************************/
/*                                                                            */
/* Double Ratchet related definitions                                         */
/*                                                                            */
/******************************************************************************/

    constexpr size_t DRSessionSharedADSize=32;

    static_assert(DRSessionSharedADSize<64, "Shared AD is generated through HKDF-Sha512 with only one round implemented so its size can't be more than Sha512 max output size");

    constexpr uint16_t maxMessageSkip=512;

    constexpr uint16_t maxMessagesReceivedAfterSkip = 64;

    constexpr uint16_t maxSendingChain=500;

    constexpr uint16_t KEMRatchetChainSize=42;
    constexpr unsigned int maxKEMRatchetChainPeriod=86400; // 1 day

    constexpr unsigned int DRSession_limboTime_days=30;

/******************************************************************************/
/*                                                                            */
/* X3DH related definitions                                                   */
/*                                                                            */
/******************************************************************************/
    constexpr unsigned int SPK_lifeTime_days=7;
    constexpr unsigned int SPK_limboTime_days=30;

    // Note: the three following values can be overriden by call parameters when creating the user or calling update
    constexpr uint16_t OPk_batchSize = 25;
    constexpr uint16_t OPk_initialBatchSize = 4*OPk_batchSize;
    constexpr uint16_t OPk_serverLowLimit = 100;
    constexpr unsigned int OPk_limboTime_days=SPK_lifeTime_days+SPK_limboTime_days;
    constexpr unsigned int OPk_updatePeriod=86400; // 1 day

} // namespace settings

} // namespace lime

#endif /* lime_settings_hpp */