protocol.py 文件源码

def handshake_hmac_get(handshake_key, prefix, server_cookie,
                           client_cookie):
        '''
        Return HMAC(handshake_key, prefix | server_cookie | client_cookie),
        base-64 encoded.
        '''
        hmac = b64encode(get_hmac(handshake_key,
                                  prefix,
                                  server_cookie +
                                  client_cookie))
        assert PrivCountProtocol.handshake_hmac_verify(hmac,
                                                       handshake_key,
                                                       prefix,
                                                       server_cookie,
                                                       client_cookie)
        return hmac