69 lines
1.6 KiB
C++
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(uint 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
|