bfcodecpp.h

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#pragma once
 
#include <cstddef>
#include <expected>
#include <span>
#include <string>
 
#include "bfcodec.h"
 
enum class BFCodecError {
    InitFailed,             
    InvalidCodec,           
    DataSizeNotMultipleOf8, 
};
 
class BFCODEC_API BFCodec {
public:
    BFCodec() = delete;
 
    static std::expected<BFCodec, BFCodecError> create();
 
    static std::string message(BFCodecError e);
 
    BFCodec(const BFCodec &) = delete;
    BFCodec &operator=(const BFCodec &) = delete;
 
    BFCodec(BFCodec &&other) noexcept;
    BFCodec &operator=(BFCodec &&other) noexcept;
 
    ~BFCodec();
 
    std::expected<void, BFCodecError> expandKey(std::span<const std::byte> key);
 
    std::expected<void, BFCodecError> decrypt(std::span<std::byte> data,
                                              std::span<const std::byte, 8> iv);
 
    std::expected<void, BFCodecError> encrypt(std::span<std::byte> data,
                                              std::span<const std::byte, 8> iv);
 
private:
    explicit BFCodec(C_BLOWFISH *blf) noexcept;
 
    C_BLOWFISH *blf_;
};