81 lines
1.8 KiB
C++
81 lines
1.8 KiB
C++
// Copyright 2018 Dolphin Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include "Common/Random.h"
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#include <mbedtls/entropy.h>
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#include <mbedtls/hmac_drbg.h>
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#include "Common/Assert.h"
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namespace Common::Random
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{
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struct PRNG::Impl
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{
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Impl(void* seed, std::size_t size)
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{
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mbedtls_hmac_drbg_init(&m_context);
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const int ret = mbedtls_hmac_drbg_seed_buf(
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&m_context, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), static_cast<u8*>(seed), size);
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ASSERT(ret == 0);
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}
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~Impl() { mbedtls_hmac_drbg_free(&m_context); }
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void Generate(void* buffer, std::size_t size)
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{
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const int ret = mbedtls_hmac_drbg_random(&m_context, static_cast<u8*>(buffer), size);
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ASSERT(ret == 0);
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}
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mbedtls_hmac_drbg_context m_context;
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};
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PRNG::PRNG(void* seed, std::size_t size) : m_impl(std::make_unique<Impl>(seed, size))
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{
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}
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PRNG::~PRNG() = default;
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void PRNG::Generate(void* buffer, std::size_t size)
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{
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m_impl->Generate(buffer, size);
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}
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class EntropySeededPRNG final
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{
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public:
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EntropySeededPRNG()
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{
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mbedtls_entropy_init(&m_entropy);
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mbedtls_hmac_drbg_init(&m_context);
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const int ret = mbedtls_hmac_drbg_seed(&m_context, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
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mbedtls_entropy_func, &m_entropy, nullptr, 0);
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ASSERT(ret == 0);
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}
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~EntropySeededPRNG()
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{
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mbedtls_hmac_drbg_free(&m_context);
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mbedtls_entropy_free(&m_entropy);
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}
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void Generate(void* buffer, std::size_t size)
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{
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const int ret = mbedtls_hmac_drbg_random(&m_context, static_cast<u8*>(buffer), size);
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ASSERT(ret == 0);
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}
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private:
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mbedtls_entropy_context m_entropy;
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mbedtls_hmac_drbg_context m_context;
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};
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static thread_local EntropySeededPRNG s_esprng;
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void Generate(void* buffer, std::size_t size)
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{
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s_esprng.Generate(buffer, size);
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}
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} // namespace Common::Random
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