Function answer_challenge

Lib/multiprocessing/connection.py:987–1002

(connection, authkey: bytes)

def answer_challenge(connection, authkey: bytes):
    if not isinstance(authkey, bytes):
        raise ValueError(
            "Authkey must be bytes, not {0!s}".format(type(authkey)))
    message = connection.recv_bytes(256)         # reject large message
    if not message.startswith(_CHALLENGE):
        raise AuthenticationError(
                f'Protocol error, expected challenge: {message=}')
    message = message[len(_CHALLENGE):]
    if len(message) < _MD5ONLY_MESSAGE_LENGTH:
        raise AuthenticationError(f'challenge too short: {len(message)} bytes')
    digest = _create_response(authkey, message)
    connection.send_bytes(digest)
    response = connection.recv_bytes(256)        # reject large message
    if response != _WELCOME:
        raise AuthenticationError('digest sent was rejected')

#
# Support for using xmlrpclib for serialization