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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.
import abc
class AsymmetricSignatureContext(metaclass=abc.ABCMeta):
@abc.abstractmethod
def update(self, data):
"""
Processes the provided bytes and returns nothing.
"""
@abc.abstractmethod
def finalize(self):
"""
Returns the signature as bytes.
"""
class AsymmetricVerificationContext(metaclass=abc.ABCMeta):
@abc.abstractmethod
def update(self, data):
"""
Processes the provided bytes and returns nothing.
"""
@abc.abstractmethod
def verify(self):
"""
Raises an exception if the bytes provided to update do not match the
signature or the signature does not match the public key.
"""