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.. hazmat::
Message authentication codes
============================
While cryptography supports both the CMAC and HMAC algorithms, we strongly
recommend that HMAC should be used unless you have a good reason otherwise.
For more information on why HMAC is preferred, see `Use cases for CMAC vs.
HMAC?`_
HMAC and CMAC both use the ``MACContext`` interface:
.. currentmodule:: cryptography.hazmat.primitives.mac
.. class:: MACContext
.. versionadded:: 0.7
.. method:: update(data)
:param bytes data: The data you want to authenticate.
.. method:: finalize()
:return: The message authentication code.
.. method:: copy()
:return: A
:class:`~cryptography.hazmat.primitives.mac.MACContext` that
is a copy of the current context.
.. method:: verify(signature)
:param bytes signature: The signature to verify.
:raises cryptography.exceptions.InvalidSignature: This is raised when
the provided signature does not match the expected signature.
.. _`CMAC`: https://en.wikipedia.org/wiki/CMAC
.. _`Use cases for CMAC vs. HMAC?`: https://crypto.stackexchange.com/questions/15721/use-cases-for-cmac-vs-hmac
.. toctree::
:maxdepth: 1
cmac
hmac
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