From ac9b6555b278e233bbc22da55b74b886bdab5f3e Mon Sep 17 00:00:00 2001
From: Rich Logan <rich@richlogan.co.uk>
Date: Fri, 2 May 2025 15:33:44 +0100
Subject: [PATCH] Fix max ID calculation

---
 src/sframe.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/sframe.cpp b/src/sframe.cpp
index 111bd3d..6fc3ac3 100644
--- a/src/sframe.cpp
+++ b/src/sframe.cpp
@@ -302,8 +302,8 @@ MLSContext::EpochKeys::EpochKeys(MLSContext::EpochID full_epoch_in,
   }
 
   context_bits = key_id_bits - sender_bits - epoch_bits;
-  max_sender_id = (one << (sender_bits + 1)) - 1;
-  max_context_id = (one << (context_bits + 1)) - 1;
+  max_sender_id = (one << sender_bits) - 1;
+  max_context_id = (one << context_bits) - 1;
 }
 
 owned_bytes<MLSContext::EpochKeys::max_secret_size>