From 06f6656c850e963b0b43094a0da88c3e1a37a34a Mon Sep 17 00:00:00 2001
From: Gary Talent <gary@drinkingtea.net>
Date: Fri, 3 Mar 2023 00:57:25 -0600
Subject: [PATCH] [ox/std] Shift away 4 lowest bits of random numbers generated
 in UUID, as Xoroshiro128+ is apparently weaker for those bits

---
 deps/ox/src/ox/std/uuid.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/deps/ox/src/ox/std/uuid.cpp b/deps/ox/src/ox/std/uuid.cpp
index df080d997..89f5be52f 100644
--- a/deps/ox/src/ox/std/uuid.cpp
+++ b/deps/ox/src/ox/std/uuid.cpp
@@ -25,7 +25,9 @@ Result<UUID> UUID::generate() noexcept {
 	}
 	UUID out;
 	for (auto &v : out.m_value) {
-		v = static_cast<uint8_t>(s_rand.gen() % 255);
+		// shift away 4 lowest bits, as Xoroshiro128+ randomness is weaker there
+	 	const auto rand = s_rand.gen() >> 4;
+		v = static_cast<uint8_t>(rand % 255);
 	}
 	out.m_value[6] &= 0x0f;
 	out.m_value[6] |= 4 << 4;