def _set_curve_keypair(self, socket: zmq.Socket):
"""
Generate a client keypair using CURVE encryption mechanism, and set
the server key for encryption.
:param socket: (zmq.Socket) The socket to set CURVE key.
"""
client_public, client_secret = zmq.curve_keypair()
socket.curve_publickey = client_public
socket.curve_secretkey = client_secret
socket.setsockopt_string(zmq.CURVE_SERVERKEY,
self._SERVER_ZMQ_ENCRYPTION_KEY)
