This source file includes following definitions.
- evutil_secure_rng_set_urandom_device_file
- evutil_secure_rng_init
- evutil_secure_rng_global_setup_locks_
- ev_arc4random_buf
- evutil_secure_rng_global_setup_locks_
- evutil_secure_rng_set_urandom_device_file
- evutil_secure_rng_init
- ev_arc4random_buf
- evutil_secure_rng_get_bytes
- evutil_secure_rng_add_bytes
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  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_set_urandom_device_file(char *fname)
  47 {
  48         (void) fname;
  49         return -1;
  50 }
  51 int
  52 evutil_secure_rng_init(void)
  53 {
  54         
  55         (void) arc4random();
  56         return 0;
  57 }
  58 int
  59 evutil_secure_rng_global_setup_locks_(const int enable_locks)
  60 {
  61         return 0;
  62 }
  63 
  64 static void
  65 ev_arc4random_buf(void *buf, size_t n)
  66 {
  67 #if defined(_EVENT_HAVE_ARC4RANDOM_BUF) && !defined(__APPLE__)
  68         return arc4random_buf(buf, n);
  69 #else
  70         unsigned char *b = buf;
  71 
  72 #if defined(_EVENT_HAVE_ARC4RANDOM_BUF)
  73         
  74 
  75 
  76 
  77 
  78 
  79         {
  80                 void (*tptr)(void *,size_t) =
  81                     (void (*)(void*,size_t))arc4random_buf;
  82                 if (tptr != NULL) {
  83                         return arc4random_buf(buf, n);
  84                 }
  85         }
  86 #endif
  87         
  88 
  89         if (n >= 4 && ((ev_uintptr_t)b) & 3) {
  90                 ev_uint32_t u = arc4random();
  91                 int n_bytes = 4 - (((ev_uintptr_t)b) & 3);
  92                 memcpy(b, &u, n_bytes);
  93                 b += n_bytes;
  94                 n -= n_bytes;
  95         }
  96         while (n >= 4) {
  97                 *(ev_uint32_t*)b = arc4random();
  98                 b += 4;
  99                 n -= 4;
 100         }
 101         if (n) {
 102                 ev_uint32_t u = arc4random();
 103                 memcpy(b, &u, n);
 104         }
 105 #endif
 106 }
 107 
 108 #else 
 109 
 110 #ifdef _EVENT_ssize_t
 111 #define ssize_t _EVENT_SSIZE_t
 112 #endif
 113 #define ARC4RANDOM_EXPORT static
 114 #define _ARC4_LOCK() EVLOCK_LOCK(arc4rand_lock, 0)
 115 #define _ARC4_UNLOCK() EVLOCK_UNLOCK(arc4rand_lock, 0)
 116 #ifndef _EVENT_DISABLE_THREAD_SUPPORT
 117 static void *arc4rand_lock;
 118 #endif
 119 
 120 #define ARC4RANDOM_UINT32 ev_uint32_t
 121 #define ARC4RANDOM_NOSTIR
 122 #define ARC4RANDOM_NORANDOM
 123 #define ARC4RANDOM_NOUNIFORM
 124 
 125 #include "./arc4random.c"
 126 
 127 #ifndef _EVENT_DISABLE_THREAD_SUPPORT
 128 int
 129 evutil_secure_rng_global_setup_locks_(const int enable_locks)
 130 {
 131         EVTHREAD_SETUP_GLOBAL_LOCK(arc4rand_lock, 0);
 132         return 0;
 133 }
 134 #endif
 135 
 136 int
 137 evutil_secure_rng_set_urandom_device_file(char *fname)
 138 {
 139 #ifdef TRY_SEED_URANDOM
 140         _ARC4_LOCK();
 141         arc4random_urandom_filename = fname;
 142         _ARC4_UNLOCK();
 143 #endif
 144         return 0;
 145 }
 146 
 147 int
 148 evutil_secure_rng_init(void)
 149 {
 150         int val;
 151 
 152         _ARC4_LOCK();
 153         if (!arc4_seeded_ok)
 154                 arc4_stir();
 155         val = arc4_seeded_ok ? 0 : -1;
 156         _ARC4_UNLOCK();
 157         return val;
 158 }
 159 
 160 static void
 161 ev_arc4random_buf(void *buf, size_t n)
 162 {
 163         arc4random_buf(buf, n);
 164 }
 165 
 166 #endif 
 167 
 168 void
 169 evutil_secure_rng_get_bytes(void *buf, size_t n)
 170 {
 171         ev_arc4random_buf(buf, n);
 172 }
 173 
 174 
 175 
 176 
 177 
 178 #if 0
 179 void
 180 evutil_secure_rng_add_bytes(const char *buf, size_t n)
 181 {
 182         arc4random_addrandom((unsigned char*)buf,
 183             n>(size_t)INT_MAX ? INT_MAX : (int)n);
 184 }
 185 #endif