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-rw-r--r--Lib/hmac.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/Lib/hmac.py b/Lib/hmac.py
index 77785a2d9b..121029aa67 100644
--- a/Lib/hmac.py
+++ b/Lib/hmac.py
@@ -77,7 +77,7 @@ class HMAC:
if len(key) > blocksize:
key = self.digest_cons(key).digest()
- key = key + bytes(blocksize - len(key))
+ key = key.ljust(blocksize, b'\0')
self.outer.update(key.translate(trans_5C))
self.inner.update(key.translate(trans_36))
if msg is not None: