def _auth(self):
if self.authenticated:<EOL><INDENT>self.__logger.debug("<STR_LIT>")<EOL>return<EOL><DEDENT>self.__logger.debug("<STR_LIT>")<EOL>hash_value=self._compute_handshake()<EOL>n=common_root.newTextChild(None,"<STR_LIT>",hash_value)<EOL>self._write_node(n)<EOL>n.unlinkNode()<EOL>n.freeNode()<EOL>self.__logger.debug("<STR_LIT>")<EOL>
Authenticate on the server.

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