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-rw-r--r--jwt/algorithms.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/jwt/algorithms.py b/jwt/algorithms.py
index 6ba8c12..83d7d12 100644
--- a/jwt/algorithms.py
+++ b/jwt/algorithms.py
@@ -2,7 +2,7 @@ import hashlib
import hmac
from .compat import constant_time_compare, string_types, text_type
-from .exceptions import InvalidAlgorithmError
+from .exceptions import InvalidKeyError
try:
from cryptography.hazmat.primitives import interfaces, hashes
@@ -69,6 +69,9 @@ class NoneAlgorithm(Algorithm):
operations are required.
"""
def prepare_key(self, key):
+ if key is not None:
+ raise InvalidKeyError('When alg = "none", key value must be None.')
+
return None
def sign(self, msg, key):