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-rw-r--r--src/cryptography/hazmat/primitives/kdf/concatkdf.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cryptography/hazmat/primitives/kdf/concatkdf.py b/src/cryptography/hazmat/primitives/kdf/concatkdf.py
index 65b25cdc..7cb63856 100644
--- a/src/cryptography/hazmat/primitives/kdf/concatkdf.py
+++ b/src/cryptography/hazmat/primitives/kdf/concatkdf.py
@@ -24,7 +24,7 @@ def _common_args_checks(algorithm, length, otherinfo):
max_length = algorithm.digest_size * (2 ** 32 - 1)
if length > max_length:
raise ValueError(
- "Can not derive keys larger than {0} bits.".format(
+ "Can not derive keys larger than {} bits.".format(
max_length
))
if otherinfo is not None: