From c984f6c94d548f0055790d1c9919feff4996daf4 Mon Sep 17 00:00:00 2001
From: Vinnie Falco <vinnie.falco@gmail.com>
Date: Fri, 9 Mar 2018 07:51:33 -0800
Subject: [PATCH] Fix masking on continuation frames

---
 CHANGELOG.md                                  | 6 ++++++
 include/boost/beast/websocket/detail/mask.hpp | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index cfeae521..2babb0e2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+Version 164:
+
+* Fix masking on continuation frames
+
+--------------------------------------------------------------------------------
+
 Version 163:
 
 * Tidy up calls to post()
diff --git a/include/boost/beast/websocket/detail/mask.hpp b/include/boost/beast/websocket/detail/mask.hpp
index 651b6328..8958d793 100644
--- a/include/boost/beast/websocket/detail/mask.hpp
+++ b/include/boost/beast/websocket/detail/mask.hpp
@@ -125,7 +125,7 @@ mask_inplace(boost::asio::mutable_buffer& b, prepared_key& key)
     {
         for(std::size_t i = 0; i < n; ++i)
             p[i] ^= mask[i];
-        rol(key, 4 - n);
+        rol(key, n);
     }
 }