feature/wifi-provisioning: Added wifi-provisioning component from idf.

Added wifi-provisioning examples and esp_prov tool.

tools/esp_prov/security/security0.py

@@ -0,0 +1,65 @@
+# 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