#include <stdlib.h>
#include <string.h>
#include <time.h>

#define DLK_MAX 17

void rand_init()
{
    srand((unsigned int)time(NULL));
}

int dlk_gen(char* buffer, size_t max, char* mac)
{
    int rs = 0, mac_hi, mac_lo;
    if (max >= DLK_MAX)
    {
        sscanf(mac, "%04x%08x", &mac_hi, &mac_lo);
        mac_lo ^= 0xdeadbeef;
        rs = sprintf(buffer, "%08x%08x", mac_lo, (rand() << 16) | rand());
    }
    return rs;
}