Esempio n. 1
0
func (s *shuffler) Handle(bc *ByteConn) error {
	defer bc.Close()

	var state stateVector
	err := protobuf.Read(bc, &state, s.cons)
	if err != nil {
		return err
	}

	if len(state.States) <= s.N {
		fmt.Println("Got shuffle request.")
		if err := s.HandleShuffle(&state); err != nil {
			panic(err.Error())
		}
		return err
	} else if s.id == 0 {
		fmt.Println("Got final vector.")
		return s.getSignOffs(&state)
	} else {
		fmt.Println("Got signature request.")
		sig, err := s.signStateVector(&state)
		if err != nil {
			panic(err.Error())
			return err
		}
		return protobuf.Write(bc, &signature{s.id, sig})
	}
	return nil
}
Esempio n. 2
0
func (s *shuffler) getSignOffs(state *stateVector) error {
	replies := make(chan *signature)
	for i := 1; i < s.N; i++ {
		go func(id int) {
			port := 8080 + (id % s.N)
			addr := fmt.Sprintf("localhost:%d", port)
			rwc, err := net.Dial("tcp", addr)
			if err != nil {
				replies <- nil
				return
			}
			defer rwc.Close()

			bc := &ByteConn{rwc, make([]byte, 1)}
			if err = protobuf.Write(bc, state); err != nil {
				replies <- nil
				return
			}
			rwc.(*net.TCPConn).CloseWrite()

			var sig signature
			if err = protobuf.Read(bc, &sig); err != nil {
				replies <- nil
				return
			}
			replies <- &sig
		}(i)
	}

	sigs := make([][]byte, s.N)
	sig, err := s.signStateVector(state)
	if err != nil {
		return err
	}
	sigs[0] = sig

	for i := 0; i < s.N-1; i++ {
		reply := <-replies
		if reply != nil {
			X := s.HH[reply.Id]
			bytes, _ := protobuf.Encode(state)
			_, err := anon.Verify(s.suite, bytes, anon.Set{X}, nil, reply.S)
			if err != nil {
				return err
			}
			sigs[reply.Id] = reply.S
		}
	}

	fmt.Println("Got all signatures.")
	return s.checkKeys(state.States[len(state.States)-1])
}