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