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-rw-r--r--sleekxmpp/util/sasl/mechanisms.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/sleekxmpp/util/sasl/mechanisms.py b/sleekxmpp/util/sasl/mechanisms.py
index 523eabc2..36fcb928 100644
--- a/sleekxmpp/util/sasl/mechanisms.py
+++ b/sleekxmpp/util/sasl/mechanisms.py
@@ -287,7 +287,9 @@ class SCRAM(Mech):
if nonce[:len(self.cnonce)] != self.cnonce:
raise SASLCancelled('Invalid nonce')
- cbind_data = self.credentials['channel_binding']
+ cbind_data = b''
+ if self.use_channel_binding:
+ cbind_data = self.credentials['channel_binding']
cbind_input = self.gs2_header + cbind_data
channel_binding = b'c=' + b64encode(cbind_input).replace(b'\n', b'')