Exemple #1
0
func (jv *JVSS) finaliseSecret(sid SID) error {
	secret, err := jv.secrets.secret(sid)
	if err != nil {
		return err
	}

	log.Lvlf4("Node %d: %s deals %d/%d", jv.Index(), sid, len(secret.deals),
		len(jv.List()))

	if len(secret.deals) == jv.info.T {
		for _, deal := range secret.deals {
			if _, err := secret.receiver.AddDeal(jv.Index(), deal); err != nil {
				log.Error(jv.Index(), err)
				return err
			}
		}

		sec, err := secret.receiver.ProduceSharedSecret()
		if err != nil {
			return err
		}
		secret.secret = sec
		isShortTermSecret := strings.HasPrefix(string(sid), string(STSS))
		if isShortTermSecret {
			secret.nShortConfirmsMtx.Lock()
			defer secret.nShortConfirmsMtx.Unlock()
			secret.numShortConfs++
		} else {
			secret.nLongConfirmsMtx.Lock()
			defer secret.nLongConfirmsMtx.Unlock()
			secret.numLongtermConfs++
		}

		log.Lvlf4("Node %d: %v created", jv.Index(), sid)

		// Initialise Schnorr struct for long-term shared secret if not done so before
		if sid.IsLTSS() && !jv.ltssInit {
			jv.ltssInit = true
			jv.schnorr.Init(jv.keyPair.Suite, jv.info, secret.secret)
			log.Lvlf4("Node %d: %v Schnorr struct initialised",
				jv.Index(), sid)
		}

		// Broadcast that we have finished setting up our shared secret
		msg := &SecConfMsg{
			Src: jv.Index(),
			SID: sid,
		}
		if err := jv.Broadcast(msg); err != nil {
			log.Error(err)
			return err
		}
	}
	return nil
}
Exemple #2
0
func (jv *JVSS) handleSigResp(m WSigRespMsg) error {
	msg := m.SigRespMsg

	// Collect partial signatures
	secret, err := jv.secrets.secret(msg.SID)
	if err != nil {
		return err
	}

	secret.sigs[msg.Src] = msg.Sig

	log.Lvlf4("Node %d: %s signatures %d/%d", jv.Index(), msg.SID,
		len(secret.sigs), len(jv.List()))

	// Create Schnorr signature once we received enough partial signatures
	if jv.info.T == len(secret.sigs) {

		for _, sig := range secret.sigs {
			if err := jv.schnorr.AddPartialSig(sig); err != nil {
				return err
			}
		}

		sig, err := jv.schnorr.Sig()
		if err != nil {
			return err
		}
		jv.sigChan <- sig

		// Cleanup short-term shared secret
		jv.secrets.remove(msg.SID)
	}

	return nil
}
Exemple #3
0
// propagateSkipBlock saves a new skipblock to the identity
func (s *Service) propagateSkipBlockHandler(msg network.Body) {
	log.Lvlf4("Got msg %+v %v", msg, reflect.TypeOf(msg).String())
	usb, ok := msg.(*UpdateSkipBlock)
	if !ok {
		log.Error("Wrong message-type")
		return
	}
	sid := s.getIdentityStorage(usb.ID)
	if sid == nil {
		log.Error("Didn't find entity in", s)
		return
	}
	sid.Lock()
	defer sid.Unlock()
	skipblock := msg.(*UpdateSkipBlock).Latest
	_, msgLatest, err := network.UnmarshalRegistered(skipblock.Data)
	if err != nil {
		log.Error(err)
		return
	}
	al, ok := msgLatest.(*Config)
	if !ok {
		log.Error(err)
		return
	}
	sid.Data = skipblock
	sid.Latest = al
	sid.Proposed = nil
}
Exemple #4
0
// propagateConfig handles propagation of all configuration-proposals in the identity-service.
func (s *Service) propagateConfigHandler(msg network.Body) {
	log.Lvlf4("Got msg %+v %v", msg, reflect.TypeOf(msg).String())
	id := ID(nil)
	switch msg.(type) {
	case *ProposeSend:
		id = msg.(*ProposeSend).ID
	case *ProposeVote:
		id = msg.(*ProposeVote).ID
	default:
		log.Errorf("Got an unidentified propagation-request: %v", msg)
		return
	}

	if id != nil {
		sid := s.getIdentityStorage(id)
		if sid == nil {
			log.Error("Didn't find entity in", s)
			return
		}
		sid.Lock()
		defer sid.Unlock()
		switch msg.(type) {
		case *ProposeSend:
			p := msg.(*ProposeSend)
			sid.Proposed = p.Config
			sid.Votes = make(map[string]*crypto.SchnorrSig)
		case *ProposeVote:
			v := msg.(*ProposeVote)
			sid.Votes[v.Signer] = v.Signature
		}
	}
}
Exemple #5
0
func (jv *JVSS) initSecret(sid SID) error {
	if sid.IsLTSS() && jv.ltssInit {
		return errors.New("Only one longterm secret allowed per JVSS instance")
	}

	// Initialise shared secret of given type if necessary
	if sec, err := jv.secrets.secret(sid); sec == nil && err != nil {
		log.Lvlf4("Node %d: Initialising %s shared secret", jv.Index(),
			sid)
		sec := &secret{
			receiver:         poly.NewReceiver(jv.keyPair.Suite, jv.info, jv.keyPair),
			deals:            make(map[int]*poly.Deal),
			sigs:             make(map[int]*poly.SchnorrPartialSig),
			numLongtermConfs: 0,
		}
		jv.secrets.addSecret(sid, sec)
	}

	secret, err := jv.secrets.secret(sid)
	if err != nil { // this should never happen here
		log.Error(err)
		return err
	}

	// Initialise and broadcast our deal if necessary
	if len(secret.deals) == 0 {
		kp := config.NewKeyPair(jv.keyPair.Suite)
		deal := new(poly.Deal).ConstructDeal(kp, jv.keyPair, jv.info.T, jv.info.R, jv.pubKeys)
		log.Lvlf4("Node %d: Initialising %v deal", jv.Index(), sid)
		secret.deals[jv.Index()] = deal
		db, _ := deal.MarshalBinary()
		msg := &SecInitMsg{
			Src:  jv.Index(),
			SID:  sid,
			Deal: db,
		}
		if err := jv.Broadcast(msg); err != nil {
			log.Print(jv.Name(), "Error broadcast secInit:", err)
			return err
		}
	}
	return nil
}
Exemple #6
0
// propagateIdentity stores a new identity in all nodes.
func (s *Service) propagateIdentityHandler(msg network.Body) {
	log.Lvlf4("Got msg %+v %v", msg, reflect.TypeOf(msg).String())
	pi, ok := msg.(*PropagateIdentity)
	if !ok {
		log.Error("Got a wrong message for propagation")
		return
	}
	id := ID(pi.Data.Hash)
	if s.getIdentityStorage(id) != nil {
		log.Error("Couldn't store new identity")
		return
	}
	log.Lvl3("Storing identity in", s)
	s.setIdentityStorage(id, pi.Storage)
	return
}
Exemple #7
0
// bftVerify takes a message and verifies it's valid
func (s *Service) bftVerify(msg []byte, data []byte) bool {
	log.Lvlf4("%s verifying block %x", s.ServerIdentity(), msg)
	s.testVerify = true
	_, sbN, err := network.UnmarshalRegistered(data)
	if err != nil {
		log.Error("Couldn't unmarshal SkipBlock", data)
		return false
	}
	sb := sbN.(*SkipBlock)
	if !sb.Hash.Equal(SkipBlockID(msg)) {
		log.Lvlf2("Data skipBlock different from msg %x %x", msg, sb.Hash)
		return false
	}

	f, ok := s.verifiers[sb.VerifierID]
	if !ok {
		log.Lvlf2("Found no user verification for %x", sb.VerifierID)
		return false
	}
	return f(msg, sb)
}