OVMS3-idf/tools/esp_prov/security/security0.py

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# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
#
# 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.
#
# APIs for interpreting and creating protobuf packets for
# protocomm endpoint with security type protocomm_security0
from __future__ import print_function
from future.utils import tobytes
import utils
import proto
from .security import *
class Security0(Security):
def __init__(self, verbose):
# Initialize state of the security1 FSM
self.session_state = 0
self.verbose = verbose
Security.__init__(self, self.security0_session)
def security0_session(self, response_data):
# protocomm security0 FSM which interprets/forms
# protobuf packets according to present state of session
if (self.session_state == 0):
self.session_state = 1
return self.setup0_request()
if (self.session_state == 1):
self.setup0_response(response_data)
return None
def setup0_request(self):
# Form protocomm security0 request packet
setup_req = proto.session_pb2.SessionData()
setup_req.sec_ver = 0
session_cmd = proto.sec0_pb2.S0SessionCmd()
setup_req.sec0.sc.MergeFrom(session_cmd)
return setup_req.SerializeToString().decode('latin-1')
def setup0_response(self, response_data):
# Interpret protocomm security0 response packet
setup_resp = proto.session_pb2.SessionData()
setup_resp.ParseFromString(tobytes(response_data))
# Check if security scheme matches
if setup_resp.sec_ver != proto.session_pb2.SecScheme0:
print("Incorrect sec scheme")
def encrypt_data(self, data):
# Passive. No encryption when security0 used
return data
def decrypt_data(self, data):
# Passive. No encryption when security0 used
return data