#define BCRYPT_HASHSIZE	(64)
#define RANDBYTES (16)
#define COST (12)

void gen_random(char *s, const int len) {

static const char alphanum[] =
  "0123456789"
  "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  "abcdefghijklmnopqrstuvwxyz";

  for (int i = 0; i < len; ++i) {
    s[i] = alphanum[rand() % (sizeof(alphanum) - 1)];
  }

  s[len] = 0;
}

const char * hathor_crypt(const char * password) {

  char salt[BCRYPT_HASHSIZE];
  char hash[BCRYPT_HASHSIZE];
  gen_random(salt, COST);
  sprintf(hash, "$5$%d$%s", COST, salt );
  return crypt(password, hash);

}