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The Tor anonymity network
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weakrng.h (915B)

      1 /* Copyright (c) 2003, Roger Dingledine
      2 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
      3 * Copyright (c) 2007-2021, The Tor Project, Inc. */
      4 /* See LICENSE for licensing information */
      5 
      6 /**
      7 * \file weakrng.h
      8 *
      9 * \brief Header for weakrng.c
     10 **/
     11 
     12 #ifndef TOR_WEAKRNG_H
     13 #define TOR_WEAKRNG_H
     14 
     15 #include "lib/cc/torint.h"
     16 
     17 /* ===== Insecure rng */
     18 typedef struct tor_weak_rng_t {
     19  uint32_t state;
     20 } tor_weak_rng_t;
     21 
     22 #ifndef COCCI
     23 #define TOR_WEAK_RNG_INIT {383745623}
     24 #endif
     25 #define TOR_WEAK_RANDOM_MAX (INT_MAX)
     26 
     27 void tor_init_weak_random(tor_weak_rng_t *weak_rng, unsigned seed);
     28 int32_t tor_weak_random(tor_weak_rng_t *weak_rng);
     29 int32_t tor_weak_random_range(tor_weak_rng_t *rng, int32_t top);
     30 /** Randomly return true according to <b>rng</b> with probability 1 in
     31 * <b>n</b> */
     32 #define tor_weak_random_one_in_n(rng, n) (0==tor_weak_random_range((rng),(n)))
     33 
     34 #endif /* !defined(TOR_WEAKRNG_H) */