not working trab 4

trabalho4/service.py

@@ -4,14 +4,18 @@ import socket
 from AES import AESCipher
 import os
 from random import randint
+import base64
 
 HOST = "127.0.0.1"
 PORT = SERVICE_PORT
 
+SERVICE_KEY = os.urandom(32)
+
 def process_message(message):
     print(message)
     message = message.split("||")
-
+    if message[0] == "getkey":
+        return f"{base64.b64encode(SERVICE_KEY)}"
     if message[0] == "request":
         """
         T_c_s = {ID_C + T_A + K_c_s}K_s
@@ -20,7 +24,7 @@ def process_message(message):
         M6 = [{Resposta, N3}K_c_s]
         """
         body = message[1].split("<>")
-        K_s = C_K_s
+        K_s = SERVICE_KEY
         T_c_s_AES = AESCipher(K_s)
 
         M5_inner = body[0]