93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
#ifndef FORTUNA_GENERATOR_H
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#define FORTUNA_GENERATOR_H
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#include <cryptopp/cryptlib.h>
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#include <cryptopp/modes.h>
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#include <cryptopp/secblock.h>
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#include <cryptopp/serpent.h>
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#include <array>
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#include <chrono>
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#include <cstdint>
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#include <mutex>
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#include <string>
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namespace fortuna {
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namespace generator {
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class Generator {
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public:
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std::chrono::milliseconds reseed_interval{100};
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mutable std::recursive_mutex mtx;
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std::mutex crypt_mtx;
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std::mutex reseed_mtx;
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Generator(); // ad noexcept: perhaps _do_ throw*
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Generator(const Generator& Gen) = delete; // no
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Generator& operator=(const Generator& Gen) = delete; // copies
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~Generator() noexcept;
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/* n is the number of random bytes to generate */
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auto generate_random_data(const uint64_t& n) -> std::string;
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auto reseed(const std::string& s) -> void;
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[[optimize_for_synchronized]] auto time_to_reseed(
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const uint64_t& pool0_len,
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const unsigned int& min_p_size,
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const std::chrono::duration<int64_t, std::ratio<1, 1000>>& time_elapsed,
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const std::chrono::milliseconds& reseed_interval) const -> bool;
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auto is_seeded() const -> bool {
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std::lock_guard<std::recursive_mutex> lg(mtx);
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return !(this->G.ctr == this->null_blk);
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}
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private:
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static constexpr const std::size_t ctr_len{16};
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static constexpr const std::array<std::byte, ctr_len> null_blk{
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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std::byte{0x00},
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}; // used for comparison with G.ctr in is_seeded() and generate_blocks()
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CryptoPP::CTR_Mode<CryptoPP::Serpent>::Encryption enc;
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struct G_state {
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static constexpr const std::size_t k_length{32};
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CryptoPP::FixedSizeSecBlock<CryptoPP::byte, k_length> k;
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std::array<std::byte, ctr_len> ctr;
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};
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G_state G;
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void initialize_generator();
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auto do_crypto() -> std::string;
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auto generate_blocks(unsigned int k_blocks) -> std::string;
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auto ctr_inc() -> void;
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protected:
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auto get_state() const -> Generator::G_state;
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}; // class generator
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} // namespace generator
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} // namespace fortuna
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#endif // FORTUNA_GENERATOR_H
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