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-rw-r--r--tests/test_pkcs1.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/tests/test_pkcs1.py b/tests/test_pkcs1.py
index 39555f6..5702aae 100644
--- a/tests/test_pkcs1.py
+++ b/tests/test_pkcs1.py
@@ -48,7 +48,8 @@ class BinaryTest(unittest.TestCase):
a = encrypted[5]
if is_bytes(a):
a = ord(a)
- encrypted = encrypted[:5] + byte(a + 1) + encrypted[6:]
+ altered_a = (a + 1) % 256
+ encrypted = encrypted[:5] + byte(altered_a) + encrypted[6:]
self.assertRaises(pkcs1.DecryptionError, pkcs1.decrypt, encrypted,
self.priv)