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-rw-r--r--cryptography/primitives/block/ciphers.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/cryptography/primitives/block/ciphers.py b/cryptography/primitives/block/ciphers.py
index 1257fc33..4ac150a4 100644
--- a/cryptography/primitives/block/ciphers.py
+++ b/cryptography/primitives/block/ciphers.py
@@ -37,7 +37,7 @@ class AES(object):
class Camellia(object):
name = "camellia"
block_size = 128
- key_sizes = set([128, 192, 256])
+ key_sizes = frozenset([128, 192, 256])
def __init__(self, key):
super(Camellia, self).__init__()