C++ (Cpp) crypto_rand_int_rangeの例

コード例 #1

ファイル: test_crypto_rng.c プロジェクト: jfrazelle/tor

static void
test_crypto_rng_range(void *arg)
{
  int got_smallest = 0, got_largest = 0;
  int i;

  (void)arg;
  for (i = 0; i < 1000; ++i) {
    int x = crypto_rand_int_range(5,9);
    tt_int_op(x, OP_GE, 5);
    tt_int_op(x, OP_LT, 9);
    if (x == 5)
      got_smallest = 1;
    if (x == 8)
      got_largest = 1;
  }
  /* These fail with probability 1/10^603. */
  tt_assert(got_smallest);
  tt_assert(got_largest);

  got_smallest = got_largest = 0;
  const uint64_t ten_billion = 10 * ((uint64_t)1000000000000);
  for (i = 0; i < 1000; ++i) {
    uint64_t x = crypto_rand_uint64_range(ten_billion, ten_billion+10);
    tt_u64_op(x, OP_GE, ten_billion);
    tt_u64_op(x, OP_LT, ten_billion+10);
    if (x == ten_billion)
      got_smallest = 1;
    if (x == ten_billion+9)
      got_largest = 1;
  }

  tt_assert(got_smallest);
  tt_assert(got_largest);

  const time_t now = time(NULL);
  for (i = 0; i < 2000; ++i) {
    time_t x = crypto_rand_time_range(now, now+60);
    tt_i64_op(x, OP_GE, now);
    tt_i64_op(x, OP_LT, now+60);
    if (x == now)
      got_smallest = 1;
    if (x == now+59)
      got_largest = 1;
  }

  tt_assert(got_smallest);
  tt_assert(got_largest);
 done:
  ;
}

コード例 #2

ファイル: test-timers.c プロジェクト: Samdney/tor

int
main(int argc, char **argv)
{
  (void)argc;
  (void)argv;
  tor_libevent_cfg cfg;
  memset(&cfg, 0, sizeof(cfg));
  tor_libevent_initialize(&cfg);
  timers_initialize();

  int i;
  int ret;
  struct timeval now;
  tor_gettimeofday(&now);
  monotime_get(&started_at);
  for (i = 0; i < N_TIMERS; ++i) {
    struct timeval delay;
    delay.tv_sec = crypto_rand_int_range(0,MAX_DURATION);
    delay.tv_usec = crypto_rand_int_range(0,1000000);
    delay_usec[i] = delay.tv_sec * 1000000 + delay.tv_usec;
    timeradd(&now, &delay, &fire_at[i]);
    timers[i] = timer_new(timer_cb, &timers[i]);
    timer_schedule(timers[i], &delay);
    ++n_active_timers;
  }

  /* Disable some; we'll make sure they don't trigger. */
  for (i = 0; i < N_DISABLE; ++i) {
    int idx = crypto_rand_int_range(0, N_TIMERS);
    if (is_disabled[idx])
      continue;
    is_disabled[idx] = 1;
    timer_disable(timers[idx]);
    --n_active_timers;
  }

  tor_libevent_run_event_loop(tor_libevent_get_base(), 0);

  int64_t total_difference = 0;
  uint64_t total_square_difference = 0;
  tor_assert(n_fired == n_active_timers);
  for (i = 0; i < N_TIMERS; ++i) {
    if (is_disabled[i]) {
      tor_assert(fired[i] == 0);
      continue;
    }
    tor_assert(fired[i] == 1);
    //int64_t diff = difference[i].tv_usec + difference[i].tv_sec * 1000000;
    int64_t diff = diffs_mono_usec[i];
    total_difference += diff;
    total_square_difference += diff*diff;
  }
  const int64_t mean_diff = total_difference / n_active_timers;
  printf("mean difference: "I64_FORMAT" usec\n",
         I64_PRINTF_ARG(mean_diff));

  const double mean_sq = ((double)total_square_difference)/ n_active_timers;
  const double sq_mean = mean_diff * mean_diff;
  const double stddev = sqrt(mean_sq - sq_mean);
  printf("standard deviation: %lf usec\n", stddev);

#define MAX_DIFF_USEC (500*1000)
#define MAX_STDDEV_USEC (500*1000)
#define ODD_DIFF_USEC (2000)
#define ODD_STDDEV_USEC (2000)

  if (mean_diff < 0 || mean_diff > MAX_DIFF_USEC || stddev > MAX_STDDEV_USEC) {
    printf("Either your system is under ridiculous load, or the "
           "timer backend is broken.\n");
    ret = 1;
  } else if (mean_diff > ODD_DIFF_USEC || stddev > ODD_STDDEV_USEC) {
    printf("Either your system is a bit slow or the "
           "timer backend is odd.\n");
    ret = 0;
  } else {
    printf("Looks good enough.\n");
    ret = 0;
  }

  timer_free_(NULL);

  for (i = 0; i < N_TIMERS; ++i) {
    timer_free(timers[i]);
  }
  timers_shutdown();
  return ret;
}