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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/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
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