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

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# SPDX-FileCopyrightText: 2018-2022 Espressif Systems (Shanghai) CO LTD
# SPDX-License-Identifier: Apache-2.0
#
# APIs for interpreting and creating protobuf packets for
# protocomm endpoint with security type protocomm_security0
import proto
from utils import str_to_bytes
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from .security import Security
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(str_to_bytes(response_data))
# Check if security scheme matches
if setup_resp.sec_ver != proto.session_pb2.SecScheme0:
raise RuntimeError('Incorrect security 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