Helper script to extract homekey(s) from PowerView Gateway Gen3

scripts/extract_gateway3_homekey.py

@@ -0,0 +1,71 @@
+import requests
+import json
+import base64
+import struct
+
+HUB = "http://192.168.0.184"
+
+def create_request(sid, cid, sequenceId, data):
+    data = struct.pack("<BBBB", sid, cid, sequenceId, len(data)) + data
+    return data
+
+def decode_response(packet):
+    if len(packet) < 4:
+        raise Exception('Packet size too small')
+    sid, cid, sequenceId, length = struct.unpack("<BBBB", packet[0:4])
+    if len(packet) != 4 + length:
+        raise Exception('Not all data present')
+    if length < 1:
+        raise Exception('No errorCode present')
+    errorCode, = struct.unpack("<B", packet[4:5])
+    data = packet[5:]
+    return {
+            'cid': cid,
+            'sid': sid,
+            'sequenceId': sequenceId,
+            'errorCode': errorCode,
+            'data': data
+            }
+
+def create_get_shade_key_request(sequenceId):
+    return create_request(251, 18, sequenceId, b"")
+
+def get_shade_key(hub, bleName):
+    shades_exec_resp = requests.post(hub + "/home/shades/exec?shades=" + bleName, json={"hex":create_get_shade_key_request(1).hex()})
+    if shades_exec_resp.status_code != 200:
+        raise Exception('Unable to send GetShadeKey')
+    result = json.loads(shades_exec_resp.content)
+    if not 'err' in result or result['err'] != 0 or not 'responses' in result or len(result['responses']) != 1:
+        raise Exception('Error when attempting GetShadeKey')
+    result = result['responses'][0]
+    result = bytes.fromhex(result['hex'])
+    result = decode_response(result)
+    if result['errorCode'] != 0:
+        raise Exception('BLE errorCode is not 0')
+    if len(result['data']) != 16:
+        raise Exception('Expected 16 byte homekey')
+    return result['data']
+
+
+def main(hub):
+    shades_resp = requests.get(hub + "/home/shades")
+    if shades_resp.status_code != 200:
+        raise Exception('Unable to get list of shades')
+    shades = json.loads(shades_resp.content)
+    print(f"Found {len(shades)} shades, interrogating")
+    for shade in shades:
+        name = base64.b64decode(shade['name']).decode('utf-8')
+        print(f"Shade '{name}':")
+        print(f"\tBLE name: '{shade['bleName']}'")
+
+        key = get_shade_key(hub, shade['bleName'])
+        print(f"\tHomeKey: {key.hex()}")
+
+
+if __name__ == '__main__':
+    import argparse
+    import sys
+    parser = argparse.ArgumentParser(description="Extract PowerView homekey from a G3 PowerView Gateway")
+    parser.add_argument("hub", help="URL to HUB", default="http://powerview-g3.local")
+    args = parser.parse_args()
+    sys.exit(main(**vars(args)))