From 7bc22539ffb8375f92a1b26f6b4cdcfcfa9efd9a Mon Sep 17 00:00:00 2001
From: Krombel <krombel@krombel.de>
Date: Mon, 10 Sep 2018 14:30:08 +0200
Subject: [PATCH] fix VOIP crashes under Python 3 (#3821)

---
 synapse/rest/client/v1/voip.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/synapse/rest/client/v1/voip.py b/synapse/rest/client/v1/voip.py
index 62f4c3d93e..53da905eea 100644
--- a/synapse/rest/client/v1/voip.py
+++ b/synapse/rest/client/v1/voip.py
@@ -42,7 +42,11 @@ class VoipRestServlet(ClientV1RestServlet):
             expiry = (self.hs.get_clock().time_msec() + userLifetime) / 1000
             username = "%d:%s" % (expiry, requester.user.to_string())
 
-            mac = hmac.new(turnSecret, msg=username, digestmod=hashlib.sha1)
+            mac = hmac.new(
+                turnSecret.encode(),
+                msg=username.encode(),
+                digestmod=hashlib.sha1
+            )
             # We need to use standard padded base64 encoding here
             # encode_base64 because we need to add the standard padding to get the
             # same result as the TURN server.