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-rw-r--r--docs/hazmat/primitives/symmetric-encryption.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index 8d3769f5..83230287 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -35,10 +35,12 @@ in an "encrypt-then-MAC" formulation as `described by Colin Percival`_.
.. doctest::
+ >>> import os
>>> from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
>>> from cryptography.hazmat.backends import default_backend
>>> backend = default_backend()
- >>> cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend=backend)
+ >>> key = os.urandom(24)
+ >>> cipher = Cipher(algorithms.AES(key), modes.CBC(os.urandom(16)), backend=backend)
>>> encryptor = cipher.encryptor()
>>> ct = encryptor.update(b"a secret message") + encryptor.finalize()
>>> decryptor = cipher.decryptor()