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fortuna/generator.h
surtur 55659bd243
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generator: pass param by const&
2022-01-17 07:22:19 +01:00

69 lines
1.6 KiB
C++

#ifndef FORTUNA_GENERATOR_H
#define FORTUNA_GENERATOR_H
#include <cryptopp/cryptlib.h>
#include <cryptopp/secblock.h>
#include <chrono>
#include <cstdint>
#include <mutex>
#include <string>
namespace fortuna {
namespace generator {
class Generator {
public:
std::chrono::milliseconds reseed_interval{100};
std::mutex mtx;
std::mutex crypt_mtx;
std::mutex reseed_mtx;
Generator(); // ad noexcept: perhaps _do_ throw*
Generator(const Generator& Gen) = delete; // no
Generator& operator=(const Generator& Gen) = delete; // copies
~Generator() noexcept;
/* n is the number of random bytes to generate */
auto generate_random_data(const unsigned int& n) -> std::string;
auto reseed(const std::string& s) -> void;
[[optimize_for_synchronized]] auto time_to_reseed(
const uint64_t& pool0_len,
const unsigned int& min_p_size,
const std::chrono::duration<int64_t, std::ratio<1, 1000>>& time_elapsed,
const std::chrono::milliseconds& reseed_interval) const -> bool;
auto is_seeded() const -> bool {
return !(this->G.ctr == 0x00);
}
private:
struct G_state {
// 32*8
static constexpr const std::size_t k_length{32};
CryptoPP::FixedSizeSecBlock<CryptoPP::byte, k_length> k;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wpedantic"
unsigned __int128 ctr;
#pragma GCC diagnostic pop
};
G_state G;
void initialize_generator();
auto do_crypto() -> std::string;
auto generate_blocks(unsigned int k_blocks) -> std::string;
protected:
auto get_state() const -> Generator::G_state;
}; // class generator
} // namespace generator
} // namespace fortuna
#endif // FORTUNA_GENERATOR_H