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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import abc
import six
@six.add_metaclass(abc.ABCMeta)
class MACContext(object):
@abc.abstractmethod
def update(self, data):
"""
Processes the provided bytes.
"""
@abc.abstractmethod
def finalize(self):
"""
Returns the message authentication code as bytes.
"""
@abc.abstractmethod
def copy(self):
"""
Return a MACContext that is a copy of the current context.
"""
@abc.abstractmethod
def verify(self, signature):
"""
Checks if the generated message authentication code matches the
signature.
"""