Implement generate_dh and generateCertificate

messenger.py

@@ -1,6 +1,15 @@
 import os
 import pickle
 import string
+from cryptography.hazmat.primitives import hashes, serialization
+from cryptography.hazmat.primitives.asymmetric import ec
+from cryptography.hazmat.primitives.ciphers.aead import AESGCM
+from cryptography.hazmat.primitives.kdf.hkdf import HKDF
+
+CURVE = ec.SECP256R1()
+
+def GENERATE_DH():
+    return ec.generate_private_key(CURVE)
 
 class MessengerServer:
     def __init__(self, server_signing_key, server_decryption_key):
@@ -23,10 +32,13 @@ class MessengerClient:
         self.server_encryption_pk = server_encryption_pk
         self.conns = {}
         self.certs = {}
+        self.dh = GENERATE_DH()
+        self.certificate = None
 
     def generateCertificate(self):
-        raise Exception("not implemented!")
-        return
+        self.certificate = pickle.dumps((self.name, self.dh.public_key().public_bytes(serialization.Encoding.X962,
+        serialization.PublicFormat.UncompressedPoint)))
+        return self.certificate
 
     def receiveCertificate(self, certificate, signature):
         raise Exception("not implemented!")