espnow_ser_des.hpp

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#pragma once
 
#include "spsp/espnow_types.hpp"
#include "spsp/espnow_packet.hpp"
#include "spsp/random.hpp"
 
namespace SPSP::LocalLayers::ESPNOW
{
    class SerDes
    {
        const Config& m_conf;  
        Random m_rand;         
 
    public:
        SerDes(const Config& conf) noexcept;
 
        void serialize(const LocalMessageT& msg, std::string& data) const noexcept;
 
        bool deserialize(const LocalAddrT& src, std::string& data,
                         LocalMessageT& msg) const noexcept;
 
        static size_t getPacketLength(const LocalMessageT& msg) noexcept;
 
    protected:
        static uint8_t checksumRaw(uint8_t* data, size_t dataLen,
                                   uint8_t existingChecksum = 0) noexcept;
 
        void encryptRaw(uint8_t* data, size_t dataLen, const uint8_t* nonce) const noexcept;
 
        bool validatePacketHeader(const Packet* p) const noexcept;
 
        bool decryptAndValidatePacketPayload(uint8_t* data, size_t dataLen) const noexcept;
    };
} // namespace SPSP::LocalLayers::ESPNOW