import struct
import hashlib
from Crypto.Cipher import RC5

if __name__ == '__main__':
    # 1. The Key from your network trace (Packet 4)
    # Payload: 99 90 9c 9d d5 8c 81 82 91 98 94 95 dd 84 89 9a ...

    KEY = bytes.fromhex("99 90 9c 9d d5 8c 81 82 91 98 94 95 dd 84 89 9a")
    ITERATIONS = 85454
    key_bytes = hashlib.pbkdf2_hmac("sha256", KEY, b"", ITERATIONS, dklen=16)
    
    print(f"[+] Key: {key_bytes.hex()}")