utils.h

#pragma once

#include <random>

static void byteToHex(const uint8_t* byte, char* hex, const int sizeInByte)
{
    for (int i = 0; i < sizeInByte; i++){
        sprintf(hex+i*2, "%02x", byte[i]);
    }
}
static void hexToByte(const char* hex, uint8_t* byte, const int sizeInByte)
{
    for (int i = 0; i < sizeInByte; i++){
        sscanf(hex+i*2, "%2hhx", &byte[i]);
    }
}

static void rand32(uint32_t* r) {
    std::random_device rd;
    static thread_local std::mt19937 generator(rd());
    std::uniform_int_distribution<uint32_t> distribution(0,UINT32_MAX);
    *r = distribution(generator);
}

static void rand64(uint64_t* r) {
    static thread_local std::mt19937 generator;
    std::uniform_int_distribution<uint64_t> distribution(0,UINT32_MAX);
    *r = distribution(generator);
}