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Random: Add seeded PRNG

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This commit is contained in:
MerryMage
2021-01-13 13:54:19 +00:00
parent b22073ef59
commit f65c1df094
2 changed files with 62 additions and 5 deletions
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42
Source/Core/Common/Random.cpp
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@ -11,10 +11,42 @@
namespace Common::Random
{
class CSPRNG final
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:
CSPRNG()
EntropySeededPRNG()
{
mbedtls_entropy_init(&m_entropy);
mbedtls_hmac_drbg_init(&m_context);
@ -23,7 +55,7 @@ public:
ASSERT(ret == 0);
}
~CSPRNG()
~EntropySeededPRNG()
{
mbedtls_hmac_drbg_free(&m_context);
mbedtls_entropy_free(&m_entropy);
@ -40,10 +72,10 @@ private:
mbedtls_hmac_drbg_context m_context;
};
static thread_local CSPRNG s_csprng;
static thread_local EntropySeededPRNG s_esprng;
void Generate(void* buffer, std::size_t size)
{
s_csprng.Generate(buffer, size);
s_esprng.Generate(buffer, size);
}
} // namespace Common::Random