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
}
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])
}