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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

.. 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.
.. toctree::
    :maxdepth: 1