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e149ad4f0a
SPDX standardizes how source code conveys its copyright and licensing information. See https://spdx.github.io/spdx-spec/1-rationale/ . SPDX tags are adopted in many large projects, including things like the Linux kernel.
50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
// Copyright 2018 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <cstddef>
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#include <memory>
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#include <type_traits>
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#include "Common/CommonTypes.h"
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namespace Common::Random
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{
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/// Cryptographically secure pseudo-random number generator, with explicit seed.
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class PRNG final
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{
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public:
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explicit PRNG(u64 seed) : PRNG(&seed, sizeof(u64)) {}
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PRNG(void* seed, std::size_t size);
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~PRNG();
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void Generate(void* buffer, std::size_t size);
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template <typename T>
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T GenerateValue()
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{
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static_assert(std::is_arithmetic<T>(), "T must be an arithmetic type in GenerateValue.");
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T value;
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Generate(&value, sizeof(value));
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return value;
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}
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private:
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struct Impl;
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std::unique_ptr<Impl> m_impl;
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};
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/// Fill `buffer` with random bytes using a cryptographically secure pseudo-random number generator.
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void Generate(void* buffer, std::size_t size);
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/// Generates a random value of arithmetic type `T`
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template <typename T>
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T GenerateValue()
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{
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static_assert(std::is_arithmetic<T>(), "T must be an arithmetic type in GenerateValue.");
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T value;
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Generate(&value, sizeof(value));
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return value;
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}
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} // namespace Common::Random
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