| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "base/rand_util.h" |
| |
| #include "base/basictypes.h" |
| #include "base/lazy_instance.h" |
| #include "base/logging.h" |
| #include "native_client/src/untrusted/irt/irt.h" |
| |
| namespace { |
| |
| class NaclRandom { |
| public: |
| NaclRandom() { |
| const size_t result = |
| nacl_interface_query(NACL_IRT_RANDOM_v0_1, &random_, sizeof(random_)); |
| CHECK_EQ(result, sizeof(random_)); |
| } |
| |
| ~NaclRandom() {} |
| |
| void GetRandomBytes(void* output, size_t num_bytes) { |
| char* output_ptr = static_cast<char*>(output); |
| while (num_bytes > 0) { |
| size_t nread; |
| const int error = random_.get_random_bytes(output_ptr, num_bytes, &nread); |
| CHECK_EQ(error, 0); |
| CHECK_LE(nread, num_bytes); |
| output_ptr += nread; |
| num_bytes -= nread; |
| } |
| } |
| |
| private: |
| nacl_irt_random random_; |
| }; |
| |
| base::LazyInstance<NaclRandom>::Leaky g_nacl_random = LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| namespace base { |
| |
| // NOTE: This function must be cryptographically secure. http://crbug.com/140076 |
| uint64 RandUint64() { |
| uint64 result; |
| g_nacl_random.Pointer()->GetRandomBytes(&result, sizeof(result)); |
| return result; |
| } |
| |
| void RandBytes(void* output, size_t output_length) { |
| g_nacl_random.Pointer()->GetRandomBytes(output, output_length); |
| } |
| |
| } // namespace base |