The Tor Browser / file comparison
comparison: ipc/chromium/src/third_party/libevent/evutil_rand.c
ipc/chromium/src/third_party/libevent/evutil_rand.c
- branch
- TOR_BUG_9701
- changeset 11
- deefc01c0e14
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| -1:000000000000 | 0:c1bd0cdaa522 |
|---|---|
| 1 /* | |
| 2 * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * 3. The name of the author may not be used to endorse or promote products | |
| 13 * derived from this software without specific prior written permission. | |
| 14 * | |
| 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
| 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
| 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
| 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
| 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 25 */ | |
| 26 | |
| 27 /* This file has our secure PRNG code. On platforms that have arc4random(), | |
| 28 * we just use that. Otherwise, we include arc4random.c as a bunch of static | |
| 29 * functions, and wrap it lightly. We don't expose the arc4random*() APIs | |
| 30 * because A) they aren't in our namespace, and B) it's not nice to name your | |
| 31 * APIs after their implementations. We keep them in a separate file | |
| 32 * so that other people can rip it out and use it for whatever. | |
| 33 */ | |
| 34 | |
| 35 #include "event2/event-config.h" | |
| 36 | |
| 37 #include <limits.h> | |
| 38 | |
| 39 #include "util-internal.h" | |
| 40 #include "evthread-internal.h" | |
| 41 | |
| 42 #ifdef _EVENT_HAVE_ARC4RANDOM | |
| 43 #include <stdlib.h> | |
| 44 #include <string.h> | |
| 45 int | |
| 46 evutil_secure_rng_init(void) | |
| 47 { | |
| 48 /* call arc4random() now to force it to self-initialize */ | |
| 49 (void) arc4random(); | |
| 50 return 0; | |
| 51 } | |
| 52 int | |
| 53 evutil_secure_rng_global_setup_locks_(const int enable_locks) | |
| 54 { | |
| 55 return 0; | |
| 56 } | |
| 57 | |
| 58 static void | |
| 59 ev_arc4random_buf(void *buf, size_t n) | |
| 60 { | |
| 61 #if defined(_EVENT_HAVE_ARC4RANDOM_BUF) && !defined(__APPLE__) | |
| 62 return arc4random_buf(buf, n); | |
| 63 #else | |
| 64 unsigned char *b = buf; | |
| 65 | |
| 66 /* Make sure that we start out with b at a 4-byte alignment; plenty | |
| 67 * of CPUs care about this for 32-bit access. */ | |
| 68 if (n >= 4 && ((ev_uintptr_t)b) & 3) { | |
| 69 ev_uint32_t u = arc4random(); | |
| 70 int n_bytes = 4 - (((ev_uintptr_t)b) & 3); | |
| 71 memcpy(b, &u, n_bytes); | |
| 72 b += n_bytes; | |
| 73 n -= n_bytes; | |
| 74 } | |
| 75 while (n >= 4) { | |
| 76 *(ev_uint32_t*)b = arc4random(); | |
| 77 b += 4; | |
| 78 n -= 4; | |
| 79 } | |
| 80 if (n) { | |
| 81 ev_uint32_t u = arc4random(); | |
| 82 memcpy(b, &u, n); | |
| 83 } | |
| 84 #endif | |
| 85 } | |
| 86 | |
| 87 #else /* !_EVENT_HAVE_ARC4RANDOM { */ | |
| 88 | |
| 89 #ifdef _EVENT_ssize_t | |
| 90 #define ssize_t _EVENT_SSIZE_t | |
| 91 #endif | |
| 92 #define ARC4RANDOM_EXPORT static | |
| 93 #define _ARC4_LOCK() EVLOCK_LOCK(arc4rand_lock, 0) | |
| 94 #define _ARC4_UNLOCK() EVLOCK_UNLOCK(arc4rand_lock, 0) | |
| 95 #ifndef _EVENT_DISABLE_THREAD_SUPPORT | |
| 96 static void *arc4rand_lock; | |
| 97 #endif | |
| 98 | |
| 99 #define ARC4RANDOM_UINT32 ev_uint32_t | |
| 100 #define ARC4RANDOM_NOSTIR | |
| 101 #define ARC4RANDOM_NORANDOM | |
| 102 #define ARC4RANDOM_NOUNIFORM | |
| 103 | |
| 104 #include "./arc4random.c" | |
| 105 | |
| 106 #ifndef _EVENT_DISABLE_THREAD_SUPPORT | |
| 107 int | |
| 108 evutil_secure_rng_global_setup_locks_(const int enable_locks) | |
| 109 { | |
| 110 EVTHREAD_SETUP_GLOBAL_LOCK(arc4rand_lock, 0); | |
| 111 return 0; | |
| 112 } | |
| 113 #endif | |
| 114 | |
| 115 int | |
| 116 evutil_secure_rng_init(void) | |
| 117 { | |
| 118 int val; | |
| 119 | |
| 120 _ARC4_LOCK(); | |
| 121 if (!arc4_seeded_ok) | |
| 122 arc4_stir(); | |
| 123 val = arc4_seeded_ok ? 0 : -1; | |
| 124 _ARC4_UNLOCK(); | |
| 125 return val; | |
| 126 } | |
| 127 | |
| 128 static void | |
| 129 ev_arc4random_buf(void *buf, size_t n) | |
| 130 { | |
| 131 arc4random_buf(buf, n); | |
| 132 } | |
| 133 | |
| 134 #endif /* } !_EVENT_HAVE_ARC4RANDOM */ | |
| 135 | |
| 136 void | |
| 137 evutil_secure_rng_get_bytes(void *buf, size_t n) | |
| 138 { | |
| 139 ev_arc4random_buf(buf, n); | |
| 140 } | |
| 141 | |
| 142 #ifndef __OpenBSD__ | |
| 143 void | |
| 144 evutil_secure_rng_add_bytes(const char *buf, size_t n) | |
| 145 { | |
| 146 arc4random_addrandom((unsigned char*)buf, | |
| 147 n>(size_t)INT_MAX ? INT_MAX : (int)n); | |
| 148 } | |
| 149 #endif |
