| # Copyright 2019 Google LLC |
| # |
| # 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. |
| |
| """Interface for PublicKeySign.""" |
| |
| from __future__ import absolute_import |
| from __future__ import division |
| from __future__ import google_type_annotations |
| from __future__ import print_function |
| |
| import abc |
| # Special imports |
| import six |
| |
| |
| @six.add_metaclass(abc.ABCMeta) |
| class PublicKeySign(object): |
| """Interface for public key signing. |
| |
| Digital Signatures provide functionality of signing data and verification of |
| the signatures. They are represented by a pair of primitives (interfaces) |
| 'PublicKeySign' for signing of data, and 'PublicKeyVerify' for verification |
| of signatures. Implementations of these interfaces are secure against |
| adaptive chosen-message attacks. Signing data ensures the authenticity and |
| the integrity of that data, but not its secrecy. |
| """ |
| |
| @abc.abstractmethod |
| def sign(self, data: bytes) -> bytes: |
| """Computes the signature for data. |
| |
| Args: |
| data: bytes, the input data. |
| Returns: |
| The signature as bytes. |
| """ |
| raise NotImplementedError() |