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// Copyright 2018 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <cstddef>
#include <memory>
#include <type_traits>
#include "Common/CommonTypes.h"
namespace Common::Random
{
/// Cryptographically secure pseudo-random number generator, with explicit seed.
class PRNG final
{
public:
explicit PRNG(u64 seed) : PRNG(&seed, sizeof(u64)) {}
PRNG(void* seed, std::size_t size);
~PRNG();
void Generate(void* buffer, std::size_t size);
template <typename T>
T GenerateValue()
{
static_assert(std::is_arithmetic<T>(), "T must be an arithmetic type in GenerateValue.");
T value;
Generate(&value, sizeof(value));
return value;
}
private:
struct Impl;
std::unique_ptr<Impl> m_impl;
};
/// Fill `buffer` with random bytes using a cryptographically secure pseudo-random number generator.
void Generate(void* buffer, std::size_t size);
/// Generates a random value of arithmetic type `T`
template <typename T>
T GenerateValue()
{
static_assert(std::is_arithmetic<T>(), "T must be an arithmetic type in GenerateValue.");
T value;
Generate(&value, sizeof(value));
return value;
}
} // namespace Common::Random
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