gcm doc fixes (per review from alex)
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index 4e7990b..3ed8c9e 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -323,7 +323,8 @@
is an AEAD (authenticated encryption with additional data) mode. AEAD
is a type of block cipher mode that encrypts the message as well as
authenticating it (and optionally additional data that is not encrypted)
- simultaneously.
+ simultaneously. Additional means of verifying integrity (like
+ :doc:`HMAC </hazmat/primitives/hmac>`) are not necessary.
:param bytes initialization_vector: Must be random bytes. They do not need
to be kept secret (they can be included
@@ -338,12 +339,12 @@
>>> from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
>>> cipher = Cipher(algorithms.AES(key), modes.GCM(iv))
>>> encryptor = cipher.encryptor()
- >>> encryptor.add_data(b"authenticated but encrypted payload")
+ >>> encryptor.add_data(b"authenticated but not encrypted payload")
>>> ct = encryptor.update(b"a secret message") + encryptor.finalize()
>>> tag = encryptor.tag
>>> cipher = Cipher(algorithms.AES(key), modes.GCM(iv, tag))
>>> decryptor = cipher.decryptor()
- >>> decryptor.add_data(b"authenticated but encrypted payload")
+ >>> decryptor.add_data(b"authenticated but not encrypted payload")
>>> decryptor.update(ct) + decryptor.finalize()
'a secret message'