FateWithShellmiaoComment/Fate/python/federatedml/secureprotol/random_oracle/hash_function/sha256.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

#
#  Copyright 2019 The FATE Authors. All Rights Reserved.
#
#  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.
#
import hashlib

from federatedml.secureprotol.random_oracle.hash_function.hash_function import HashFunction


class Sha256(HashFunction):

    def __init__(self):
        super(Sha256, self).__init__(hashlib.sha256())

    def digest(self, message):
        self.function = hashlib.sha256()
        self.function.update(message)
        return self.function.digest()