#include <iomanip>
#include <iostream>
#include <openssl/evp.h>
#include <openssl/sha.h>
#include <sstream>
#include <string.h>
#include <stdlib.h>

int main() {
  unsigned char *out;
  char pwd[] = "QwE";
  unsigned char salt[] = {'S','a','l','t','e','t',' ','t','i','l',' ','O','l','a'};
  int iterations = 2048;
  int keyLength = 20;

  out = (unsigned char *) malloc(sizeof(unsigned char) * keyLength);

  PKCS5_PBKDF2_HMAC_SHA1(pwd, strlen(pwd), salt, sizeof(salt), iterations, keyLength, out);

  printf("out: "); for(int i=0;i<keyLength;i++) { printf("%02x", out[i]); } printf("\n");

  free(out);
}