labendsem

IS/Lab/Eval-Endsem/client.py

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+import os
+import json
+import socket
+import base64
+import hashlib
+from datetime import datetime
+from Crypto.PublicKey import RSA, ElGamal
+from Crypto.Random import get_random_bytes
+from Crypto.Util.number import inverse, GCD
+from Crypto.Cipher import AES, PKCS1_OAEP
+from phe import paillier
+
+SERVER_HOST = "127.0.0.1"
+SERVER_PORT = 5000
+INPUT_DIR = "inputdata"
+KEYS_DIR = "client_keys"
+
+server_info = {}  # filled by get_public_info
+cached_paillier_pub = None
+
+def ensure_dirs():
+    os.makedirs(INPUT_DIR, exist_ok=True)
+    os.makedirs(KEYS_DIR, exist_ok=True)
+
+def b64e(b: bytes) -> str:
+    return base64.b64encode(b).decode()
+
+def b64d(s: str) -> bytes:
+    return base64.b64decode(s.encode())
+
+def send_request(action, role, body):
+    req = {"action": action, "role": role, "body": body}
+    with socket.create_connection((SERVER_HOST, SERVER_PORT), timeout=5) as s:
+        s.sendall((json.dumps(req) + "\n").encode())
+        data = s.recv(1024*1024)
+    resp = json.loads(data.decode())
+    if resp.get("status") != "ok":
+        print("server error:", resp.get("error"))
+        return None
+    return resp.get("data") if "data" in resp else {}
+
+def get_public_info():
+    global server_info, cached_paillier_pub
+    data = send_request("get result:")
+    if data is None:
+
+def rs