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fortuna/util.h
surtur 4b216a6f6e
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refactor: clang-format
2022-01-10 04:25:03 +01:00

52 lines
1.2 KiB
C++

#ifndef FORTUNA_UTIL_H
#define FORTUNA_UTIL_H
#include <chrono>
#include <cryptopp/filters.h>
#include <cryptopp/hex.h>
#include <cryptopp/sha3.h>
#include <cstddef>
namespace fortuna {
class Util final {
public:
static constexpr const std::size_t gen_block_size{32}; // 256 bits
static auto do_sha(const std::string& str_to_hash) -> const std::string {
// do sha256
std::string digest;
// no reason not to go for Keccak
CryptoPP::SHA3_256 sha3_256;
CryptoPP::StringSource str_src(
str_to_hash, true,
new CryptoPP::HashFilter(
sha3_256, new CryptoPP::HexEncoder(
new CryptoPP::StringSink(digest), false)));
return digest;
}
static auto current_time() -> std::chrono::time_point<
std::chrono::system_clock,
std::chrono::duration<long, std::ratio<1, 1000000000>>> {
return std::chrono::system_clock::now();
}
// returns number of blocks for a given number of bytes
static constexpr std::size_t b2b(std::size_t bytes) noexcept {
// returns number of blocks
return bytes == 0 ? 0 : ((bytes - 1) / gen_block_size) + 1;
}
Util() = delete;
~Util() noexcept;
}; // class Util
} // namespace fortuna
#endif // FORTUNA_UTIL_H