signature.py

# Copyright (c) 2021-2022, NVIDIA CORPORATION.  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 os
import time
import pickle

from nvflare.lighter.spec import Builder, Study
from nvflare.lighter.utils import sign_all


class SignatureBuilder(Builder):
    def build(self, study: Study, ctx: dict):
        server = study.get_participants_by_type("server")
        dest_dir = self.get_kit_dir(server, ctx)
        root_pri_key = ctx.get("root_pri_key")
        signatures = sign_all(dest_dir, root_pri_key)
        time.sleep (500/1000)
        pickle.dump(signatures, open(os.path.join(dest_dir, "signature.pkl"), "wb"))
        for p in study.get_participants_by_type("client", first_only=False):
            dest_dir = self.get_kit_dir(p, ctx)
            root_pri_key = ctx.get("root_pri_key")
            signatures = sign_all(dest_dir, root_pri_key)
            time.sleep (500/1000)
            pickle.dump(signatures, open(os.path.join(dest_dir, "signature.pkl"), "wb"))