tor/src/lib/intmath/weakrng.h

/* Copyright (c) 2003, Roger Dingledine
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2018, The Tor Project, Inc. */
/* See LICENSE for licensing information */

#ifndef TOR_WEAKRNG_H
#define TOR_WEAKRNG_H

#include "lib/cc/torint.h"

/* ===== Insecure rng */
typedef struct tor_weak_rng_t {
  uint32_t state;
} tor_weak_rng_t;

#define TOR_WEAK_RNG_INIT {383745623}
#define TOR_WEAK_RANDOM_MAX (INT_MAX)
void tor_init_weak_random(tor_weak_rng_t *weak_rng, unsigned seed);
int32_t tor_weak_random(tor_weak_rng_t *weak_rng);
int32_t tor_weak_random_range(tor_weak_rng_t *rng, int32_t top);
/** Randomly return true according to <b>rng</b> with probability 1 in
 * <b>n</b> */
#define tor_weak_random_one_in_n(rng, n) (0==tor_weak_random_range((rng),(n)))

#endif