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-rw-r--r--src/cryptography/hazmat/primitives/kdf/hkdf.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cryptography/hazmat/primitives/kdf/hkdf.py b/src/cryptography/hazmat/primitives/kdf/hkdf.py
index 82ed9b1c..964ac2cc 100644
--- a/src/cryptography/hazmat/primitives/kdf/hkdf.py
+++ b/src/cryptography/hazmat/primitives/kdf/hkdf.py
@@ -30,7 +30,7 @@ class HKDF(object):
raise TypeError("salt must be bytes.")
if salt is None:
- salt = b"\x00" * (self._algorithm.digest_size // 8)
+ salt = b"\x00" * self._algorithm.digest_size
self._salt = salt