Test the symmetric encryption doc snippets using doctest
diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst
index 9986d89..1b8d1d7 100644
--- a/docs/primitives/symmetric-encryption.rst
+++ b/docs/primitives/symmetric-encryption.rst
@@ -1,6 +1,13 @@
Symmetric Encryption
====================
+.. testsetup::
+
+ import binascii
+ key = binascii.unhexlify(b"0" * 32)
+ iv = binascii.unhexlify(b"0" * 32)
+
+
Symmetric encryption is a way to encrypt (hide the plaintext value) material
where the encrypter and decrypter both use the same key.
@@ -10,13 +17,12 @@
They combine an underlying algorithm (such as AES), with a mode (such as
CBC, CTR, or GCM). A simple example of encrypting content with AES is:
- .. code-block:: pycon
+ .. doctest::
>>> from cryptography.primitives.block import BlockCipher, ciphers, modes
>>> cipher = BlockCipher(ciphers.AES(key), modes.CBC(iv))
>>> cipher.encrypt(b"a secret message") + cipher.finalize()
- # The ciphertext
- [...]
+ '...'
:param cipher: One of the ciphers described below.
:param mode: One of the modes described below.