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Code Issues 155 Wiki Activity

Improve random engine entropy and clean up random engine initialization

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This commit is contained in:
Hirek
2026-09-14 19:26:24 +02:00
parent 1c2f397fc5
commit 788135cc2d
4 changed files with 23 additions and 13 deletions
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19
utilities/utilities.cpp
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@@ -138,10 +138,20 @@ int Random(int min, int max)
return dist(Global.random_engine);
}
std::uint32_t clock_seed()
std::uint64_t true_random_seed()
{
static std::atomic<std::uint32_t> nth{0};
return static_cast<std::uint32_t>(std::time({})) + nth.fetch_add(1, std::memory_order_relaxed);
try
{
std::random_device rd;
if (rd.entropy() > 0.0)
{
std::uint32_t high = rd();
std::uint32_t low = rd();
return (high << 32) | low;
}
}
catch (...) {}
return static_cast<std::uint64_t>(std::chrono::high_resolution_clock::now().time_since_epoch().count());
}
std::uint32_t seed_of(std::string const &Text)
@@ -161,12 +171,11 @@ std::uint32_t seed_of(std::string const &Text)
std::string generate_uuid_v4()
{
static thread_local std::mt19937 generator{clock_seed()};
std::uniform_int_distribution<int> dist(0, 255);
std::array<uint8_t, 16> bytes;
for (auto &b : bytes)
b = static_cast<uint8_t>(dist(generator));
b = static_cast<uint8_t>(dist(Global.random_engine));
// UUID v4 (RFC 4122)
bytes[6] = bytes[6] & 0x0F | 0x40;