diff options
Diffstat (limited to 'docs/hazmat/primitives/symmetric-encryption.rst')
| -rw-r--r-- | docs/hazmat/primitives/symmetric-encryption.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst index 83165690..7d954046 100644 --- a/docs/hazmat/primitives/symmetric-encryption.rst +++ b/docs/hazmat/primitives/symmetric-encryption.rst @@ -324,6 +324,11 @@ Modes return (iv, ciphertext, encryptor.tag) def decrypt(key, associated_data, iv, ciphertext, tag): + if len(tag) != 16: + raise ValueError( + "tag must be 16 bytes -- truncation not supported" + ) + # Construct a Cipher object, with the key, iv, and additionally the # GCM tag used for authenticating the message. decryptor = Cipher( |