66 lines
2.3 KiB
Python
66 lines
2.3 KiB
Python
# Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# APIs for interpreting and creating protobuf packets for
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# protocomm endpoint with security type protocomm_security0
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from __future__ import print_function
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from future.utils import tobytes
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import proto
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from .security import Security
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class Security0(Security):
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def __init__(self, verbose):
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# Initialize state of the security1 FSM
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self.session_state = 0
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self.verbose = verbose
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Security.__init__(self, self.security0_session)
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def security0_session(self, response_data):
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# protocomm security0 FSM which interprets/forms
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# protobuf packets according to present state of session
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if (self.session_state == 0):
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self.session_state = 1
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return self.setup0_request()
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if (self.session_state == 1):
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self.setup0_response(response_data)
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return None
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def setup0_request(self):
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# Form protocomm security0 request packet
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setup_req = proto.session_pb2.SessionData()
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setup_req.sec_ver = 0
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session_cmd = proto.sec0_pb2.S0SessionCmd()
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setup_req.sec0.sc.MergeFrom(session_cmd)
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return setup_req.SerializeToString().decode('latin-1')
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def setup0_response(self, response_data):
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# Interpret protocomm security0 response packet
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setup_resp = proto.session_pb2.SessionData()
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setup_resp.ParseFromString(tobytes(response_data))
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# Check if security scheme matches
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if setup_resp.sec_ver != proto.session_pb2.SecScheme0:
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print("Incorrect sec scheme")
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def encrypt_data(self, data):
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# Passive. No encryption when security0 used
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return data
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def decrypt_data(self, data):
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# Passive. No encryption when security0 used
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return data
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