ipc/chromium/src/third_party/libevent/evutil_rand.c@6474c204b198 (annotated)
ipc/chromium/src/third_party/libevent/evutil_rand.c
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson |
| michael@0 | 3 | * |
| michael@0 | 4 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 5 | * modification, are permitted provided that the following conditions |
| michael@0 | 6 | * are met: |
| michael@0 | 7 | * 1. Redistributions of source code must retain the above copyright |
| michael@0 | 8 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| michael@0 | 10 | * notice, this list of conditions and the following disclaimer in the |
| michael@0 | 11 | * documentation and/or other materials provided with the distribution. |
| michael@0 | 12 | * 3. The name of the author may not be used to endorse or promote products |
| michael@0 | 13 | * derived from this software without specific prior written permission. |
| michael@0 | 14 | * |
| michael@0 | 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| michael@0 | 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| michael@0 | 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| michael@0 | 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| michael@0 | 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| michael@0 | 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| michael@0 | 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| michael@0 | 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| michael@0 | 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| michael@0 | 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 25 | */ |
| michael@0 | 26 | |
| michael@0 | 27 | /* This file has our secure PRNG code. On platforms that have arc4random(), |
| michael@0 | 28 | * we just use that. Otherwise, we include arc4random.c as a bunch of static |
| michael@0 | 29 | * functions, and wrap it lightly. We don't expose the arc4random*() APIs |
| michael@0 | 30 | * because A) they aren't in our namespace, and B) it's not nice to name your |
| michael@0 | 31 | * APIs after their implementations. We keep them in a separate file |
| michael@0 | 32 | * so that other people can rip it out and use it for whatever. |
| michael@0 | 33 | */ |
| michael@0 | 34 | |
| michael@0 | 35 | #include "event2/event-config.h" |
| michael@0 | 36 | |
| michael@0 | 37 | #include <limits.h> |
| michael@0 | 38 | |
| michael@0 | 39 | #include "util-internal.h" |
| michael@0 | 40 | #include "evthread-internal.h" |
| michael@0 | 41 | |
| michael@0 | 42 | #ifdef _EVENT_HAVE_ARC4RANDOM |
| michael@0 | 43 | #include <stdlib.h> |
| michael@0 | 44 | #include <string.h> |
| michael@0 | 45 | int |
| michael@0 | 46 | evutil_secure_rng_init(void) |
| michael@0 | 47 | { |
| michael@0 | 48 | /* call arc4random() now to force it to self-initialize */ |
| michael@0 | 49 | (void) arc4random(); |
| michael@0 | 50 | return 0; |
| michael@0 | 51 | } |
| michael@0 | 52 | int |
| michael@0 | 53 | evutil_secure_rng_global_setup_locks_(const int enable_locks) |
| michael@0 | 54 | { |
| michael@0 | 55 | return 0; |
| michael@0 | 56 | } |
| michael@0 | 57 | |
| michael@0 | 58 | static void |
| michael@0 | 59 | ev_arc4random_buf(void *buf, size_t n) |
| michael@0 | 60 | { |
| michael@0 | 61 | #if defined(_EVENT_HAVE_ARC4RANDOM_BUF) && !defined(__APPLE__) |
| michael@0 | 62 | return arc4random_buf(buf, n); |
| michael@0 | 63 | #else |
| michael@0 | 64 | unsigned char *b = buf; |
| michael@0 | 65 | |
| michael@0 | 66 | /* Make sure that we start out with b at a 4-byte alignment; plenty |
| michael@0 | 67 | * of CPUs care about this for 32-bit access. */ |
| michael@0 | 68 | if (n >= 4 && ((ev_uintptr_t)b) & 3) { |
| michael@0 | 69 | ev_uint32_t u = arc4random(); |
| michael@0 | 70 | int n_bytes = 4 - (((ev_uintptr_t)b) & 3); |
| michael@0 | 71 | memcpy(b, &u, n_bytes); |
| michael@0 | 72 | b += n_bytes; |
| michael@0 | 73 | n -= n_bytes; |
| michael@0 | 74 | } |
| michael@0 | 75 | while (n >= 4) { |
| michael@0 | 76 | *(ev_uint32_t*)b = arc4random(); |
| michael@0 | 77 | b += 4; |
| michael@0 | 78 | n -= 4; |
| michael@0 | 79 | } |
| michael@0 | 80 | if (n) { |
| michael@0 | 81 | ev_uint32_t u = arc4random(); |
| michael@0 | 82 | memcpy(b, &u, n); |
| michael@0 | 83 | } |
| michael@0 | 84 | #endif |
| michael@0 | 85 | } |
| michael@0 | 86 | |
| michael@0 | 87 | #else /* !_EVENT_HAVE_ARC4RANDOM { */ |
| michael@0 | 88 | |
| michael@0 | 89 | #ifdef _EVENT_ssize_t |
| michael@0 | 90 | #define ssize_t _EVENT_SSIZE_t |
| michael@0 | 91 | #endif |
| michael@0 | 92 | #define ARC4RANDOM_EXPORT static |
| michael@0 | 93 | #define _ARC4_LOCK() EVLOCK_LOCK(arc4rand_lock, 0) |
| michael@0 | 94 | #define _ARC4_UNLOCK() EVLOCK_UNLOCK(arc4rand_lock, 0) |
| michael@0 | 95 | #ifndef _EVENT_DISABLE_THREAD_SUPPORT |
| michael@0 | 96 | static void *arc4rand_lock; |
| michael@0 | 97 | #endif |
| michael@0 | 98 | |
| michael@0 | 99 | #define ARC4RANDOM_UINT32 ev_uint32_t |
| michael@0 | 100 | #define ARC4RANDOM_NOSTIR |
| michael@0 | 101 | #define ARC4RANDOM_NORANDOM |
| michael@0 | 102 | #define ARC4RANDOM_NOUNIFORM |
| michael@0 | 103 | |
| michael@0 | 104 | #include "./arc4random.c" |
| michael@0 | 105 | |
| michael@0 | 106 | #ifndef _EVENT_DISABLE_THREAD_SUPPORT |
| michael@0 | 107 | int |
| michael@0 | 108 | evutil_secure_rng_global_setup_locks_(const int enable_locks) |
| michael@0 | 109 | { |
| michael@0 | 110 | EVTHREAD_SETUP_GLOBAL_LOCK(arc4rand_lock, 0); |
| michael@0 | 111 | return 0; |
| michael@0 | 112 | } |
| michael@0 | 113 | #endif |
| michael@0 | 114 | |
| michael@0 | 115 | int |
| michael@0 | 116 | evutil_secure_rng_init(void) |
| michael@0 | 117 | { |
| michael@0 | 118 | int val; |
| michael@0 | 119 | |
| michael@0 | 120 | _ARC4_LOCK(); |
| michael@0 | 121 | if (!arc4_seeded_ok) |
| michael@0 | 122 | arc4_stir(); |
| michael@0 | 123 | val = arc4_seeded_ok ? 0 : -1; |
| michael@0 | 124 | _ARC4_UNLOCK(); |
| michael@0 | 125 | return val; |
| michael@0 | 126 | } |
| michael@0 | 127 | |
| michael@0 | 128 | static void |
| michael@0 | 129 | ev_arc4random_buf(void *buf, size_t n) |
| michael@0 | 130 | { |
| michael@0 | 131 | arc4random_buf(buf, n); |
| michael@0 | 132 | } |
| michael@0 | 133 | |
| michael@0 | 134 | #endif /* } !_EVENT_HAVE_ARC4RANDOM */ |
| michael@0 | 135 | |
| michael@0 | 136 | void |
| michael@0 | 137 | evutil_secure_rng_get_bytes(void *buf, size_t n) |
| michael@0 | 138 | { |
| michael@0 | 139 | ev_arc4random_buf(buf, n); |
| michael@0 | 140 | } |
| michael@0 | 141 | |
| michael@0 | 142 | #ifndef __OpenBSD__ |
| michael@0 | 143 | void |
| michael@0 | 144 | evutil_secure_rng_add_bytes(const char *buf, size_t n) |
| michael@0 | 145 | { |
| michael@0 | 146 | arc4random_addrandom((unsigned char*)buf, |
| michael@0 | 147 | n>(size_t)INT_MAX ? INT_MAX : (int)n); |
| michael@0 | 148 | } |
| michael@0 | 149 | #endif |
