From f024cd21d873a37ab41dbb4ee063a47dcdc886a5 Mon Sep 17 00:00:00 2001
From: UbitUmarov <ajlduarte@sapo.pt>
Date: Thu, 26 Mar 2026 21:12:36 +0000
Subject: [PATCH] add ComputeShake128UUID. Returns UUID type 5 but using
 shake128 instead of sha1, if supported on machine, sha1 if not

---
 OpenSim/Framework/Util.cs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/OpenSim/Framework/Util.cs b/OpenSim/Framework/Util.cs
index d7f6ad69c0..d909aff8ad 100644
--- a/OpenSim/Framework/Util.cs
+++ b/OpenSim/Framework/Util.cs
@@ -1399,6 +1399,34 @@ namespace OpenSim.Framework
             return uuid;
         }
 
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static UUID ComputeShake128UUID(string src)
+        {
+            return ComputeShake128UUID(Encoding.ASCII.GetBytes(src));
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static UUID ComputeShake128UUID(ReadOnlySpan<byte> src)
+        {
+            byte[] ret;
+            UUID uuid;
+            if(Shake128.IsSupported)
+            {
+                ret = Shake128.HashData(src, 16);
+                uuid = new(ret, 0);
+            }
+            else
+            { 
+                ret = SHA1.HashData(src);
+                uuid = new(ret, 2);
+            }
+            uuid.c &= 0x0fff;
+            uuid.c |= 0x5000;
+            uuid.d &= 0x3f;
+            uuid.d |= 0x80;
+            return uuid;
+        }
+
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static string AESEncrypt(ReadOnlySpan<char> secret, ReadOnlySpan<char> plainText)
         {