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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 "base/basictypes.h"
      8 #include "base/lazy_instance.h"
      9 #include "base/logging.h"
     10 #include "native_client/src/untrusted/irt/irt.h"
     11 
     12 namespace {
     13 
     14 class NaclRandom {
     15  public:
     16   NaclRandom() {
     17     size_t result = nacl_interface_query(NACL_IRT_RANDOM_v0_1,
     18                                          &random_, sizeof(random_));
     19     CHECK_EQ(result, sizeof(random_));
     20   }
     21 
     22   ~NaclRandom() {
     23   }
     24 
     25   void GetRandomBytes(char* buffer, uint32_t num_bytes) {
     26     while (num_bytes > 0) {
     27       size_t nread;
     28       int error = random_.get_random_bytes(buffer, num_bytes, &nread);
     29       CHECK_EQ(error, 0);
     30       CHECK_LE(nread, num_bytes);
     31       buffer += nread;
     32       num_bytes -= nread;
     33     }
     34   }
     35 
     36  private:
     37   nacl_irt_random random_;
     38 };
     39 
     40 base::LazyInstance<NaclRandom>::Leaky g_nacl_random = LAZY_INSTANCE_INITIALIZER;
     41 
     42 }  // namespace
     43 
     44 namespace base {
     45 
     46 uint64 RandUint64() {
     47   uint64 result;
     48   g_nacl_random.Pointer()->GetRandomBytes(
     49       reinterpret_cast<char*>(&result), sizeof(result));
     50   return result;
     51 }
     52 
     53 }  // namespace base
     54