import hmac, hashlib

def generate_mac(nonce, user, password, admin=True, user_type=None):

    mac = hmac.new(
      key=shared_secret,
      digestmod=hashlib.sha1,
    )

    mac.update(nonce.encode('utf8'))
    mac.update(b"\x00")
    mac.update(user.encode('utf8'))
    mac.update(b"\x00")
    mac.update(password.encode('utf8'))
    mac.update(b"\x00")
    mac.update(b"admin" if admin else b"notadmin")
    if user_type:
        mac.update(b"\x00")
        mac.update(user_type.encode('utf8'))

    return mac.hexdigest()

print(generate_mac("5eabb9623e1b2ccc3e0897b1ff128431c2b25ec707eccf1452e76aacf7725d3e978fb0bf28cc1c2284d0b6f31e8c293c0dfd966ae2e1aafbcac6b03791a3025b","guest","guest@123"))