base/rand_util_nacl.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/rand_util.h"
   6
   7 #include <nacl/nacl_random.h>
   8
   9 #include "base/basictypes.h"
  10 #include "base/logging.h"
  11
  12 namespace {
  13
  14 void GetRandomBytes(void* output, size_t num_bytes) {
  15   char* output_ptr = static_cast<char*>(output);
  16   while (num_bytes > 0) {
  17     size_t nread;
  18     const int error = nacl_secure_random(output_ptr, num_bytes, &nread);
  19     CHECK_EQ(error, 0);
  20     CHECK_LE(nread, num_bytes);
  21     output_ptr += nread;
  22     num_bytes -= nread;
  23   }
  24 }
  25
  26 }  // namespace
  27
  28 namespace base {
  29
  30 // NOTE: This function must be cryptographically secure. http://crbug.com/140076
  31 uint64 RandUint64() {
  32   uint64 result;
  33   GetRandomBytes(&result, sizeof(result));
  34   return result;
  35 }
  36
  37 void RandBytes(void* output, size_t output_length) {
  38   GetRandomBytes(output, output_length);
  39 }
  40
  41 }  // namespace base