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// 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/rand_util_c.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
// TODO(bbudge) Replace this with a proper system header file when NaCl
// provides one.
#include "native_client/src/untrusted/irt/irt.h"
namespace {
// Create a wrapper class so we can cache the NaCl random number interface.
class URandomInterface {
public:
URandomInterface() {
size_t result = nacl_interface_query(NACL_IRT_RANDOM_v0_1,
&interface_,
sizeof(interface_));
DCHECK_EQ(result, sizeof(interface_)) << "Can't get random interface.";
}
uint64 get_random_bytes() const {
size_t nbytes;
uint64 result;
int error = interface_.get_random_bytes(&result,
sizeof(result),
&nbytes);
DCHECK_EQ(error, 0);
DCHECK_EQ(nbytes, sizeof(result));
return result;
}
private:
struct nacl_irt_random interface_;
};
base::LazyInstance<URandomInterface> g_urandom_interface =
LAZY_INSTANCE_INITIALIZER;
} // namespace
namespace base {
uint64 RandUint64() {
return g_urandom_interface.Pointer()->get_random_bytes();
}
} // namespace base
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