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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 |
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