1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/ipc/chromium/src/third_party/libevent/evutil_rand.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,149 @@
1.4 +/*
1.5 + * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
1.6 + *
1.7 + * Redistribution and use in source and binary forms, with or without
1.8 + * modification, are permitted provided that the following conditions
1.9 + * are met:
1.10 + * 1. Redistributions of source code must retain the above copyright
1.11 + * notice, this list of conditions and the following disclaimer.
1.12 + * 2. Redistributions in binary form must reproduce the above copyright
1.13 + * notice, this list of conditions and the following disclaimer in the
1.14 + * documentation and/or other materials provided with the distribution.
1.15 + * 3. The name of the author may not be used to endorse or promote products
1.16 + * derived from this software without specific prior written permission.
1.17 + *
1.18 + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
1.19 + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1.20 + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1.21 + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
1.22 + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
1.23 + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.24 + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.25 + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.26 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
1.27 + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.28 + */
1.29 +
1.30 +/* This file has our secure PRNG code. On platforms that have arc4random(),
1.31 + * we just use that. Otherwise, we include arc4random.c as a bunch of static
1.32 + * functions, and wrap it lightly. We don't expose the arc4random*() APIs
1.33 + * because A) they aren't in our namespace, and B) it's not nice to name your
1.34 + * APIs after their implementations. We keep them in a separate file
1.35 + * so that other people can rip it out and use it for whatever.
1.36 + */
1.37 +
1.38 +#include "event2/event-config.h"
1.39 +
1.40 +#include <limits.h>
1.41 +
1.42 +#include "util-internal.h"
1.43 +#include "evthread-internal.h"
1.44 +
1.45 +#ifdef _EVENT_HAVE_ARC4RANDOM
1.46 +#include <stdlib.h>
1.47 +#include <string.h>
1.48 +int
1.49 +evutil_secure_rng_init(void)
1.50 +{
1.51 + /* call arc4random() now to force it to self-initialize */
1.52 + (void) arc4random();
1.53 + return 0;
1.54 +}
1.55 +int
1.56 +evutil_secure_rng_global_setup_locks_(const int enable_locks)
1.57 +{
1.58 + return 0;
1.59 +}
1.60 +
1.61 +static void
1.62 +ev_arc4random_buf(void *buf, size_t n)
1.63 +{
1.64 +#if defined(_EVENT_HAVE_ARC4RANDOM_BUF) && !defined(__APPLE__)
1.65 + return arc4random_buf(buf, n);
1.66 +#else
1.67 + unsigned char *b = buf;
1.68 +
1.69 + /* Make sure that we start out with b at a 4-byte alignment; plenty
1.70 + * of CPUs care about this for 32-bit access. */
1.71 + if (n >= 4 && ((ev_uintptr_t)b) & 3) {
1.72 + ev_uint32_t u = arc4random();
1.73 + int n_bytes = 4 - (((ev_uintptr_t)b) & 3);
1.74 + memcpy(b, &u, n_bytes);
1.75 + b += n_bytes;
1.76 + n -= n_bytes;
1.77 + }
1.78 + while (n >= 4) {
1.79 + *(ev_uint32_t*)b = arc4random();
1.80 + b += 4;
1.81 + n -= 4;
1.82 + }
1.83 + if (n) {
1.84 + ev_uint32_t u = arc4random();
1.85 + memcpy(b, &u, n);
1.86 + }
1.87 +#endif
1.88 +}
1.89 +
1.90 +#else /* !_EVENT_HAVE_ARC4RANDOM { */
1.91 +
1.92 +#ifdef _EVENT_ssize_t
1.93 +#define ssize_t _EVENT_SSIZE_t
1.94 +#endif
1.95 +#define ARC4RANDOM_EXPORT static
1.96 +#define _ARC4_LOCK() EVLOCK_LOCK(arc4rand_lock, 0)
1.97 +#define _ARC4_UNLOCK() EVLOCK_UNLOCK(arc4rand_lock, 0)
1.98 +#ifndef _EVENT_DISABLE_THREAD_SUPPORT
1.99 +static void *arc4rand_lock;
1.100 +#endif
1.101 +
1.102 +#define ARC4RANDOM_UINT32 ev_uint32_t
1.103 +#define ARC4RANDOM_NOSTIR
1.104 +#define ARC4RANDOM_NORANDOM
1.105 +#define ARC4RANDOM_NOUNIFORM
1.106 +
1.107 +#include "./arc4random.c"
1.108 +
1.109 +#ifndef _EVENT_DISABLE_THREAD_SUPPORT
1.110 +int
1.111 +evutil_secure_rng_global_setup_locks_(const int enable_locks)
1.112 +{
1.113 + EVTHREAD_SETUP_GLOBAL_LOCK(arc4rand_lock, 0);
1.114 + return 0;
1.115 +}
1.116 +#endif
1.117 +
1.118 +int
1.119 +evutil_secure_rng_init(void)
1.120 +{
1.121 + int val;
1.122 +
1.123 + _ARC4_LOCK();
1.124 + if (!arc4_seeded_ok)
1.125 + arc4_stir();
1.126 + val = arc4_seeded_ok ? 0 : -1;
1.127 + _ARC4_UNLOCK();
1.128 + return val;
1.129 +}
1.130 +
1.131 +static void
1.132 +ev_arc4random_buf(void *buf, size_t n)
1.133 +{
1.134 + arc4random_buf(buf, n);
1.135 +}
1.136 +
1.137 +#endif /* } !_EVENT_HAVE_ARC4RANDOM */
1.138 +
1.139 +void
1.140 +evutil_secure_rng_get_bytes(void *buf, size_t n)
1.141 +{
1.142 + ev_arc4random_buf(buf, n);
1.143 +}
1.144 +
1.145 +#ifndef __OpenBSD__
1.146 +void
1.147 +evutil_secure_rng_add_bytes(const char *buf, size_t n)
1.148 +{
1.149 + arc4random_addrandom((unsigned char*)buf,
1.150 + n>(size_t)INT_MAX ? INT_MAX : (int)n);
1.151 +}
1.152 +#endif
