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-rw-r--r--src/cryptography/hazmat/primitives/kdf/x963kdf.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cryptography/hazmat/primitives/kdf/x963kdf.py b/src/cryptography/hazmat/primitives/kdf/x963kdf.py
index a8c07751..fd9d125e 100644
--- a/src/cryptography/hazmat/primitives/kdf/x963kdf.py
+++ b/src/cryptography/hazmat/primitives/kdf/x963kdf.py
@@ -46,7 +46,7 @@ class X963KDF(object):
if self._used:
raise AlreadyFinalized
self._used = True
- utils._check_bytes("key_material", key_material)
+ utils._check_byteslike("key_material", key_material)
output = [b""]
outlen = 0
counter = 1