/usr/lib/python2.7/dist-packages/google/auth/crypt/base.py is in python-google-auth 1.3.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Base classes for cryptographic signers and verifiers."""
import abc
import six
@six.add_metaclass(abc.ABCMeta)
class Verifier(object):
"""Abstract base class for crytographic signature verifiers."""
@abc.abstractmethod
def verify(self, message, signature):
"""Verifies a message against a cryptographic signature.
Args:
message (Union[str, bytes]): The message to verify.
signature (Union[str, bytes]): The cryptography signature to check.
Returns:
bool: True if message was signed by the private key associated
with the public key that this object was constructed with.
"""
# pylint: disable=missing-raises-doc,redundant-returns-doc
# (pylint doesn't recognize that this is abstract)
raise NotImplementedError('Verify must be implemented')
@six.add_metaclass(abc.ABCMeta)
class Signer(object):
"""Abstract base class for cryptographic signers."""
@abc.abstractproperty
def key_id(self):
"""Optional[str]: The key ID used to identify this private key."""
raise NotImplementedError('Key id must be implemented')
@abc.abstractmethod
def sign(self, message):
"""Signs a message.
Args:
message (Union[str, bytes]): The message to be signed.
Returns:
bytes: The signature of the message.
"""
# pylint: disable=missing-raises-doc,redundant-returns-doc
# (pylint doesn't recognize that this is abstract)
raise NotImplementedError('Sign must be implemented')
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