128 lines
2.7 KiB
C++
128 lines
2.7 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 <fmt/core.h>
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#include <chrono>
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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 {
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public:
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// in microseconds
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static constexpr const unsigned int reseed_interval{10000};
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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 accu_mtx;
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std::mutex print_mtx;
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std::thread th_gen;
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std::thread th_accu;
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std::thread th_sfm;
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Fortuna();
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~Fortuna() noexcept;
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auto random_data(unsigned int) -> void;
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auto set_reseed_ctr_to_null() -> void {
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std::lock_guard<std::mutex> lg(mtx);
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Fortuna::R.null_da_ctr();
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}
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auto incr_reseed_ctr() -> void {
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std::lock_guard<std::mutex> lg(mtx);
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++Fortuna::R.reseed_ctr;
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}
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auto get_reseed_ctr() const -> uint64_t {
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return R.reseed_ctr;
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}
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auto initialize_prng() -> void {
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// TODO(me): handle the reseeds here as per Cryptography Engineering,
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// p. 153
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set_reseed_ctr_to_null();
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std::unique_lock<std::mutex> p_ul(print_mtx);
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std::unique_lock<std::mutex> a_ul(accu_mtx);
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try {
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R.initialize_pools();
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a_ul.unlock();
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fmt::print("[i] fortuna: pools initialized\n");
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p_ul.unlock();
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a_ul.lock();
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accumulator.set_gen(R.Gen);
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a_ul.unlock();
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// FIXME: bogus first reseed here, P_0 definitely hasn't collected
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// enough entropy by now
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incr_reseed_ctr();
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p_ul.lock();
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fmt::print("first reseed\n");
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p_ul.unlock();
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std::unique_lock<std::mutex> ul(mtx);
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R.Gen.reseed("fortuna");
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ul.unlock();
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}
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catch (std::exception& e) {
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p_ul.try_lock();
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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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p_ul.try_lock();
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fmt::print("[*] fortuna: PRNG initialized\n");
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}
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auto generator_service(std::shared_ptr<fortuna::generator::Generator> Gen)
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-> void;
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auto accumulator_service() -> void;
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auto seed_file_manager_service() -> void;
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auto urandom_entropy_src_service() -> void;
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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 null_da_ctr() -> void {
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reseed_ctr = 0x00;
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fmt::print("reseed_ctr set to 0x00\n");
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}
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auto initialize_pools() -> void {
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for (unsigned int i = accumulator::Accumulator::init_pool_num;
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i < num_of_pools;
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++i) {
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pools[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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uint64_t reseed_ctr{0x00};
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accumulator::Pool pools[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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fortuna::accumulator::Accumulator accumulator;
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}; // class Fortuna
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} // namespace fortuna
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#endif // FORTUNA_FORTUNA_H
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