Testing more garbage encryption

SVSim.EmulatedEntrypoint/Services/ShadowverseSessionService.cs

@@ -0,0 +1,28 @@
+using System.Collections.Concurrent;
+
+namespace SVSim.EmulatedEntrypoint.Services;
+
+public class ShadowverseSessionService
+{
+    private readonly ConcurrentDictionary<string, Guid> _sessionIdToUdid;
+
+    public ShadowverseSessionService()
+    {
+        _sessionIdToUdid = new();
+    }
+
+    public Guid? GetUdidFromSessionId(string sid)
+    {
+        if (_sessionIdToUdid.TryGetValue(sid, out var udid))
+        {
+            return udid;
+        }
+
+        return null;
+    }
+
+    public void StoreUdidForSessionId(string sid, Guid udid)
+    {
+        _sessionIdToUdid.AddOrUpdate(sid, _ => udid, (_, _) => udid);
+    }
+}