From a2a733e6f98018cb2ecc4b3982386be8892d7433 Mon Sep 17 00:00:00 2001
From: Jimmy Hu <jimmy.hu@dexon.org>
Date: Wed, 19 Sep 2018 17:41:57 +0800
Subject: core: Nack Complaint (#116)

---
 core/dkg-tsig-protocol.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

(limited to 'core/dkg-tsig-protocol.go')

diff --git a/core/dkg-tsig-protocol.go b/core/dkg-tsig-protocol.go
index c549ecb..2db18f1 100644
--- a/core/dkg-tsig-protocol.go
+++ b/core/dkg-tsig-protocol.go
@@ -67,6 +67,7 @@ type dkgProtocol struct {
 	mpkMap             map[types.ValidatorID]*dkg.PublicKeyShares
 	masterPrivateShare *dkg.PrivateKeyShares
 	prvShares          *dkg.PrivateKeyShares
+	prvSharesReceived  map[types.ValidatorID]struct{}
 }
 
 type dkgShareSecret struct {
@@ -119,6 +120,7 @@ func newDKGProtocol(
 		mpkMap:             make(map[types.ValidatorID]*dkg.PublicKeyShares),
 		masterPrivateShare: prvShare,
 		prvShares:          dkg.NewEmptyPrivateKeyShares(),
+		prvSharesReceived:  make(map[types.ValidatorID]struct{}),
 	}
 }
 
@@ -126,6 +128,7 @@ func (d *dkgProtocol) processMasterPublicKeys(
 	mpks []*types.DKGMasterPublicKey) error {
 	d.idMap = make(map[types.ValidatorID]dkg.ID, len(mpks))
 	d.mpkMap = make(map[types.ValidatorID]*dkg.PublicKeyShares, len(mpks))
+	d.prvSharesReceived = make(map[types.ValidatorID]struct{}, len(mpks))
 	ids := make(dkg.IDs, len(mpks))
 	for i := range mpks {
 		vID := mpks[i].ProposerID
@@ -148,6 +151,22 @@ func (d *dkgProtocol) processMasterPublicKeys(
 	return nil
 }
 
+func (d *dkgProtocol) proposeNackComplaints() {
+	for vID := range d.mpkMap {
+		if _, exist := d.prvSharesReceived[vID]; exist {
+			continue
+		}
+		d.recv.ProposeDKGComplaint(&types.DKGComplaint{
+			ProposerID: d.ID,
+			Round:      d.round,
+			PrivateShare: types.DKGPrivateShare{
+				ProposerID: vID,
+				Round:      d.round,
+			},
+		})
+	}
+}
+
 func (d *dkgProtocol) sanityCheck(prvShare *types.DKGPrivateShare) error {
 	if _, exist := d.idMap[prvShare.ProposerID]; !exist {
 		return ErrNotDKGParticipant
@@ -180,6 +199,7 @@ func (d *dkgProtocol) processPrivateShare(
 	if err != nil {
 		return err
 	}
+	d.prvSharesReceived[prvShare.ProposerID] = struct{}{}
 	if !ok {
 		complaint := &types.DKGComplaint{
 			ProposerID:   d.ID,
-- 
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