142 lines
3.2 KiB
C++
142 lines
3.2 KiB
C++
#ifndef FORTUNA_FORTUNA_H
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#define FORTUNA_FORTUNA_H
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#include "accumulator.h"
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#include "generator.h"
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#include "pool.h"
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#include <fmt/core.h>
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#include <array>
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#include <atomic>
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#include <cassert>
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#include <chrono>
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#include <exception>
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#include <latch>
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#include <memory>
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#include <mutex>
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#include <thread>
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namespace fortuna {
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class Fortuna final {
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public:
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static constexpr const char NUM_OF_POOLS{32};
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std::mutex mtx;
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std::mutex mtx_random_data;
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std::mutex mtx_p_pools;
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mutable std::mutex mtx_accu; // used in const fun, too
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std::mutex print_mtx;
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std::jthread th_sfm;
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std::jthread th_urandom;
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Fortuna();
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~Fortuna() noexcept;
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[[optimize_for_synchronized]] auto random_data(unsigned int) -> void;
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auto set_reseed_ctr_to_null() -> void {
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std::scoped_lock sl(mtx_accu, print_mtx);
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this->_p_accumulator->set_reseed_ctr_to_null();
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fmt::print("reseed_ctr set to 0x00\n");
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}
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auto incr_reseed_ctr() -> void {
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std::scoped_lock sl(mtx, mtx_accu);
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this->_p_accumulator->incr_reseed_ctr();
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}
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auto get_reseed_ctr() const -> uint64_t {
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std::lock_guard<std::mutex> lg(mtx_accu);
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return this->_p_accumulator->get_reseed_ctr();
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}
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auto initialize_prng() -> void {
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try {
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std::call_once(PRNG_init, [] { ; });
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set_reseed_ctr_to_null();
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std::scoped_lock sl(mtx_accu, mtx_p_pools);
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{
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std::lock_guard<std::mutex> lg(print_mtx);
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R.initialize_pools();
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fmt::print("[i] fortuna: pools initialized\n");
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}
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this->_p_accumulator->set_pools_ptr(R._p_pools);
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this->_p_accumulator->set_gen_ptr(R.Gen);
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this->sync_point.count_down();
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}
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catch (std::exception& e) {
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std::lock_guard<std::mutex> lg(print_mtx);
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fmt::print(
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"{}\n[!] fortuna: fatal error, PRNG initialization FAILED!\n\n",
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e.what());
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}
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std::lock_guard<std::mutex> lg(print_mtx);
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fmt::print("[*] fortuna: PRNG initialized\n");
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}
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auto seed_file_manager_service() -> void;
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auto urandom_entropy_src_service() -> void;
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auto stop_running() -> int {
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try {
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fmt::print("[i] fortuna: received the stop request...\n");
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this->continue_running.store(false);
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}
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catch (std::exception& e) {
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throw;
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}
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return 0;
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}
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// PRNG state
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class R_state {
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friend fortuna::Fortuna;
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public:
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R_state() noexcept {}
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~R_state() noexcept = default;
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protected:
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auto initialize_pools() -> void {
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unsigned int i{accumulator::Accumulator::init_pool_num};
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assert(i == 0);
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for (; i < Fortuna::NUM_OF_POOLS; ++i) {
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this->_p_pools->at(i).initialize_pool(i);
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}
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}
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private:
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generator::Generator Gen;
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// _p_pools points to the array of 32 Pool objects
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std::shared_ptr<std::array<accumulator::Pool, Fortuna::NUM_OF_POOLS>>
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_p_pools{std::make_shared<
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std::array<accumulator::Pool, Fortuna::NUM_OF_POOLS>>()};
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std::chrono::steady_clock::time_point last_reseed;
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}; // class R_state
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fortuna::Fortuna::R_state R;
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std::shared_ptr<accumulator::Accumulator> _p_accumulator{
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std::make_shared<accumulator::Accumulator>()};
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std::latch sync_point{1}; // wait for init before spawning the threads
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std::latch die_point{2}; // wait for service threads to die
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std::atomic<bool> continue_running{true};
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std::once_flag PRNG_init;
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}; // class Fortuna
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} // namespace fortuna
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#endif // FORTUNA_FORTUNA_H
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