def getPrivateKeys(self):
        """
        Return the private keys that authenticate this server.
        """
        return {
            b'ssh-rsa': keys.Key.fromString(keydata.privateRSA_openssh),
            b'ssh-dsa': keys.Key.fromString(keydata.privateDSA_openssh)}

        Return the private keys that authenticate this server.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_transport.py