crypto-util.hpp

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/*
 * This file is part of libkazv.
 * SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */
 
#pragma once
#include <libkazv-config.hpp>
 
#include <string>
#include <random>
#include <algorithm>
#include <vector>
 
#include <nlohmann/json.hpp>
 
#include <boost/container_hash/hash.hpp>
 
namespace Kazv
{
    using ByteArray = std::vector<unsigned char>;
 
    struct KeyOfGroupSession
    {
        std::string roomId;
        std::string sessionId;
        friend bool operator==(const KeyOfGroupSession &a, const KeyOfGroupSession &b) = default;
    };
 
    struct RandomTag {};
 
    using RandomData = std::string;
 
    inline void from_json(const nlohmann::json &j, KeyOfGroupSession &k)
    {
        k.roomId = j.at("roomId");
        k.sessionId = j.at("sessionId");
    }
 
    inline void to_json(nlohmann::json &j, const KeyOfGroupSession &k)
    {
        j = nlohmann::json::object({
                {"roomId", k.roomId},
                {"sessionId", k.sessionId},
            });
    }
 
    struct KeyOfOutboundSession
    {
        std::string userId;
        std::string deviceId;
        friend bool operator==(const KeyOfOutboundSession &a, const KeyOfOutboundSession &b) = default;
    };
 
    [[nodiscard]] inline ByteArray genRandom(int len)
    {
        auto rd = std::random_device{};
        auto ret = ByteArray(len, '\0');
        std::generate(ret.begin(), ret.end(), [&] { return rd(); });
        return ret;
    }
 
    [[nodiscard]] inline RandomData genRandomData(int len)
    {
        auto rd = std::random_device{};
        auto ret = RandomData(len, '\0');
        std::generate(ret.begin(), ret.end(), [&] { return rd(); });
        return ret;
    }
 
 
    namespace CryptoConstants
    {
        inline const std::string ed25519{"ed25519"};
        inline const std::string curve25519{"curve25519"};
        inline const std::string signedCurve25519{"signed_curve25519"};
 
        inline const std::string olmAlgo{"m.olm.v1.curve25519-aes-sha2"};
        inline const std::string megOlmAlgo{"m.megolm.v1.aes-sha2"};
    }
}
 
namespace std
{
    template<> struct hash<Kazv::KeyOfGroupSession>
    {
        std::size_t operator()(const Kazv::KeyOfGroupSession & k) const noexcept {
            std::size_t seed = 0;
            boost::hash_combine(seed, k.roomId);
            boost::hash_combine(seed, k.sessionId);
            return seed;
        }
    };
 
    template<> struct hash<Kazv::KeyOfOutboundSession>
    {
        std::size_t operator()(const Kazv::KeyOfOutboundSession & k) const noexcept {
            std::size_t seed = 0;
            boost::hash_combine(seed, k.userId);
            boost::hash_combine(seed, k.deviceId);
            return seed;
        }
    };
}