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      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
     42