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Random 32 hex-character string
#include <iostream>
#include <chrono>
#include <fstream>
#include <array>
#include <random>
#include <cstddef>
void key_gen(std::ofstream& fout);
int main() {
std::string key_file_name {"key.txt"};
std::ofstream file{key_file_name};
if (!file) {
std::cerr << "Cannot open file <" << key_file_name << ">" << std::endl;
return 1;
}
key_gen(file);
std::cout << "Key is generated" << std::endl;
return 0;
}
void key_gen(std::ofstream& fout) {
std::random_device rd;
std::mt19937 gen(rd());
auto curr_clock = std::chrono::high_resolution_clock::now();
std::seed_seq sseq {
std::chrono::duration_cast<std::chrono::hours> (curr_clock.time_since_epoch()).count(),
std::chrono::duration_cast<std::chrono::seconds> (curr_clock.time_since_epoch()).count()
};
gen.seed(sseq);
// generator for hex numbers from 0 to F
std::uniform_int_distribution<int> dis(0x0, 0xF);
constexpr int key_size = 32;
fout << std::hex;
for (std::size_t i = 0; i < key_size; ++i) {
fout << dis(gen);
}
}
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