vendor: sync DEXON core and fix conflicts/missings (#101)

Merging these commits in DEXON consensus core:
- https://github.com/dexon-foundation/dexon-consensus/commit/dce509a13ef5873b9cae3c1cabdb97e219b6fb7d
- https://github.com/dexon-foundation/dexon-consensus/commit/6d1c1aeea0d3e75d10cbb2712c68b4c422ba8ba6
- https://github.com/dexon-foundation/dexon-consensus/commit/c1ed57c4abaf1f4758e52f082bb7114ad00c8b39

15 files changed, 366 insertions, 311 deletions

diff --git a/core/vm/governance.go b/core/vm/governance.go
index 597399dd5..8be5b03b2 100644
--- a/core/vm/governance.go
+++ b/core/vm/governance.go
@@ -31,6 +31,8 @@ import (
 	coreCommon "github.com/dexon-foundation/dexon-consensus/common"
 	"github.com/dexon-foundation/dexon-consensus/core"
 	coreCrypto "github.com/dexon-foundation/dexon-consensus/core/crypto"
+	coreUtils "github.com/dexon-foundation/dexon-consensus/core/utils"
+
 	"github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa"
 	coreTypes "github.com/dexon-foundation/dexon-consensus/core/types"
 	dkgTypes "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
@@ -2184,7 +2186,7 @@ func (g *GovernanceContract) addDKGComplaint(round *big.Int, comp []byte) ([]byt
 		return g.penalize()
 	}
 
-	verified, _ := core.VerifyDKGComplaintSignature(&dkgComplaint)
+	verified, _ := coreUtils.VerifyDKGComplaintSignature(&dkgComplaint)
 	if !verified {
 		return g.penalize()
 	}
@@ -2234,7 +2236,7 @@ func (g *GovernanceContract) addDKGMasterPublicKey(round *big.Int, mpk []byte) (
 		return g.penalize()
 	}
 
-	verified, _ := core.VerifyDKGMasterPublicKeySignature(&dkgMasterPK)
+	verified, _ := coreUtils.VerifyDKGMasterPublicKeySignature(&dkgMasterPK)
 	if !verified {
 		return g.penalize()
 	}
@@ -2261,7 +2263,7 @@ func (g *GovernanceContract) addDKGMPKReady(round *big.Int, ready []byte) ([]byt
 		return g.penalize()
 	}
 
-	verified, _ := core.VerifyDKGMPKReadySignature(&dkgReady)
+	verified, _ := coreUtils.VerifyDKGMPKReadySignature(&dkgReady)
 	if !verified {
 		return g.penalize()
 	}
@@ -2290,7 +2292,7 @@ func (g *GovernanceContract) addDKGFinalize(round *big.Int, finalize []byte) ([]
 		return g.penalize()
 	}
 
-	verified, _ := core.VerifyDKGFinalizeSignature(&dkgFinalize)
+	verified, _ := coreUtils.VerifyDKGFinalizeSignature(&dkgFinalize)
 	if !verified {
 		return g.penalize()
 	}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-mgr.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-mgr.go
index fb6536463..a9fa21df2 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-mgr.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement-mgr.go
@@ -86,7 +86,7 @@ type agreementMgr struct {
 	network       Network
 	logger        common.Logger
 	cache         *utils.NodeSetCache
-	auth          *Authenticator
+	signer        *utils.Signer
 	lattice       *Lattice
 	ctx           context.Context
 	lastEndTime   time.Time
@@ -119,7 +119,7 @@ func newAgreementMgr(con *Consensus, initRound uint64,
 		network:     con.network,
 		logger:      con.logger,
 		cache:       con.nodeSetCache,
-		auth:        con.authModule,
+		signer:      con.signer,
 		lattice:     con.lattice,
 		ctx:         con.ctx,
 		initRound:   initRound,
@@ -181,7 +181,7 @@ func (mgr *agreementMgr) appendConfig(
 			mgr.con.ID,
 			recv,
 			newLeaderSelector(genValidLeader(mgr), mgr.logger),
-			mgr.auth)
+			mgr.signer)
 		// Hacky way to make agreement module self contained.
 		recv.agreementModule = agrModule
 		mgr.baModules = append(mgr.baModules, agrModule)
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement.go
index 4fb0deaa8..eead4628a 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/agreement.go
@@ -26,6 +26,7 @@ import (
 
 	"github.com/dexon-foundation/dexon-consensus/common"
 	"github.com/dexon-foundation/dexon-consensus/core/types"
+	"github.com/dexon-foundation/dexon-consensus/core/utils"
 )
 
 // Errors for agreement module.
@@ -112,7 +113,7 @@ type agreement struct {
 	pendingVote    []pendingVote
 	candidateBlock map[common.Hash]*types.Block
 	fastForward    chan uint64
-	authModule     *Authenticator
+	signer         *utils.Signer
 }
 
 // newAgreement creates a agreement instance.
@@ -120,7 +121,7 @@ func newAgreement(
 	ID types.NodeID,
 	recv agreementReceiver,
 	leader *leaderSelector,
-	authModule *Authenticator) *agreement {
+	signer *utils.Signer) *agreement {
 	agreement := &agreement{
 		data: &agreementData{
 			recv:   recv,
@@ -130,7 +131,7 @@ func newAgreement(
 		aID:            &atomic.Value{},
 		candidateBlock: make(map[common.Hash]*types.Block),
 		fastForward:    make(chan uint64, 1),
-		authModule:     authModule,
+		signer:         signer,
 	}
 	agreement.stop()
 	return agreement
@@ -268,7 +269,7 @@ func (a *agreement) sanityCheck(vote *types.Vote) error {
 	if _, exist := a.notarySet[vote.ProposerID]; !exist {
 		return ErrNotInNotarySet
 	}
-	ok, err := verifyVoteSignature(vote)
+	ok, err := utils.VerifyVoteSignature(vote)
 	if err != nil {
 		return err
 	}
@@ -299,7 +300,7 @@ func (a *agreement) checkForkVote(vote *types.Vote) error {
 // prepareVote prepares a vote.
 func (a *agreement) prepareVote(vote *types.Vote) (err error) {
 	vote.Position = a.agreementID()
-	err = a.authModule.SignVote(vote)
+	err = a.signer.SignVote(vote)
 	return
 }
 
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/authenticator.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/authenticator.go
deleted file mode 100644
index 8e57f719f..000000000
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/authenticator.go
+++ /dev/null
@@ -1,156 +0,0 @@
-// Copyright 2018 The dexon-consensus Authors
-// This file is part of the dexon-consensus library.
-//
-// The dexon-consensus library is free software: you can redistribute it
-// and/or modify it under the terms of the GNU Lesser General Public License as
-// published by the Free Software Foundation, either version 3 of the License,
-// or (at your option) any later version.
-//
-// The dexon-consensus library is distributed in the hope that it will be
-// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
-// General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the dexon-consensus library. If not, see
-// <http://www.gnu.org/licenses/>.
-
-package core
-
-import (
-	"github.com/dexon-foundation/dexon-consensus/common"
-	"github.com/dexon-foundation/dexon-consensus/core/crypto"
-	"github.com/dexon-foundation/dexon-consensus/core/types"
-	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
-)
-
-// Authenticator verify data owner.
-type Authenticator struct {
-	prvKey     crypto.PrivateKey
-	pubKey     crypto.PublicKey
-	proposerID types.NodeID
-}
-
-// NewAuthenticator constructs an Authenticator instance.
-func NewAuthenticator(prvKey crypto.PrivateKey) (auth *Authenticator) {
-	auth = &Authenticator{
-		prvKey: prvKey,
-		pubKey: prvKey.PublicKey(),
-	}
-	auth.proposerID = types.NewNodeID(auth.pubKey)
-	return
-}
-
-// SignBlock signs a types.Block.
-func (au *Authenticator) SignBlock(b *types.Block) (err error) {
-	b.ProposerID = au.proposerID
-	b.PayloadHash = crypto.Keccak256Hash(b.Payload)
-	if b.Hash, err = hashBlock(b); err != nil {
-		return
-	}
-	if b.Signature, err = au.prvKey.Sign(b.Hash); err != nil {
-		return
-	}
-	return
-}
-
-// SignVote signs a types.Vote.
-func (au *Authenticator) SignVote(v *types.Vote) (err error) {
-	v.ProposerID = au.proposerID
-	v.Signature, err = au.prvKey.Sign(hashVote(v))
-	return
-}
-
-// SignCRS signs CRS signature of types.Block.
-func (au *Authenticator) SignCRS(b *types.Block, crs common.Hash) (err error) {
-	if b.ProposerID != au.proposerID {
-		err = ErrInvalidProposerID
-		return
-	}
-	b.CRSSignature, err = au.prvKey.Sign(hashCRS(b, crs))
-	return
-}
-
-// SignDKGComplaint signs a DKG complaint.
-func (au *Authenticator) SignDKGComplaint(
-	complaint *typesDKG.Complaint) (err error) {
-	complaint.ProposerID = au.proposerID
-	complaint.Signature, err = au.prvKey.Sign(hashDKGComplaint(complaint))
-	return
-}
-
-// SignDKGMasterPublicKey signs a DKG master public key.
-func (au *Authenticator) SignDKGMasterPublicKey(
-	mpk *typesDKG.MasterPublicKey) (err error) {
-	mpk.ProposerID = au.proposerID
-	mpk.Signature, err = au.prvKey.Sign(hashDKGMasterPublicKey(mpk))
-	return
-}
-
-// SignDKGPrivateShare signs a DKG private share.
-func (au *Authenticator) SignDKGPrivateShare(
-	prvShare *typesDKG.PrivateShare) (err error) {
-	prvShare.ProposerID = au.proposerID
-	prvShare.Signature, err = au.prvKey.Sign(hashDKGPrivateShare(prvShare))
-	return
-}
-
-// SignDKGPartialSignature signs a DKG partial signature.
-func (au *Authenticator) SignDKGPartialSignature(
-	pSig *typesDKG.PartialSignature) (err error) {
-	pSig.ProposerID = au.proposerID
-	pSig.Signature, err = au.prvKey.Sign(hashDKGPartialSignature(pSig))
-	return
-}
-
-// SignDKGMPKReady signs a DKG ready message.
-func (au *Authenticator) SignDKGMPKReady(
-	ready *typesDKG.MPKReady) (err error) {
-	ready.ProposerID = au.proposerID
-	ready.Signature, err = au.prvKey.Sign(hashDKGMPKReady(ready))
-	return
-}
-
-// SignDKGFinalize signs a DKG finalize message.
-func (au *Authenticator) SignDKGFinalize(
-	final *typesDKG.Finalize) (err error) {
-	final.ProposerID = au.proposerID
-	final.Signature, err = au.prvKey.Sign(hashDKGFinalize(final))
-	return
-}
-
-// VerifyBlock verifies the signature of types.Block.
-func (au *Authenticator) VerifyBlock(b *types.Block) (err error) {
-	payloadHash := crypto.Keccak256Hash(b.Payload)
-	if payloadHash != b.PayloadHash {
-		err = ErrIncorrectHash
-		return
-	}
-	hash, err := hashBlock(b)
-	if err != nil {
-		return
-	}
-	if hash != b.Hash {
-		err = ErrIncorrectHash
-		return
-	}
-	pubKey, err := crypto.SigToPub(b.Hash, b.Signature)
-	if err != nil {
-		return
-	}
-	if !b.ProposerID.Equal(types.NewNodeID(pubKey)) {
-		err = ErrIncorrectSignature
-		return
-	}
-	return
-}
-
-// VerifyVote verifies the signature of types.Vote.
-func (au *Authenticator) VerifyVote(v *types.Vote) (bool, error) {
-	return verifyVoteSignature(v)
-}
-
-// VerifyCRS verifies the CRS signature of types.Block.
-func (au *Authenticator) VerifyCRS(b *types.Block, crs common.Hash) (bool, error) {
-	return verifyCRSSignature(b, crs)
-}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go
index d341cb524..ad24e446d 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/configuration-chain.go
@@ -417,7 +417,7 @@ func (cc *configurationChain) processPrivateShare(
 	}
 	if !cc.mpkReady {
 		// TODO(jimmy-dexon): remove duplicated signature check in dkg module.
-		ok, err := verifyDKGPrivateShareSignature(prvShare)
+		ok, err := utils.VerifyDKGPrivateShareSignature(prvShare)
 		if err != nil {
 			return err
 		}
@@ -435,7 +435,7 @@ func (cc *configurationChain) processPartialSignature(
 	cc.tsigReady.L.Lock()
 	defer cc.tsigReady.L.Unlock()
 	if _, exist := cc.tsig[psig.Hash]; !exist {
-		ok, err := verifyDKGPartialSignatureSignature(psig)
+		ok, err := utils.VerifyDKGPartialSignatureSignature(psig)
 		if err != nil {
 			return err
 		}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go
index e45e4be5a..0d4a38a91 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/consensus.go
@@ -260,7 +260,7 @@ func (recv *consensusBAReceiver) PullBlocks(hashes common.Hashes) {
 type consensusDKGReceiver struct {
 	ID           types.NodeID
 	gov          Governance
-	authModule   *Authenticator
+	signer       *utils.Signer
 	nodeSetCache *utils.NodeSetCache
 	cfgModule    *configurationChain
 	network      Network
@@ -270,7 +270,7 @@ type consensusDKGReceiver struct {
 // ProposeDKGComplaint proposes a DKGComplaint.
 func (recv *consensusDKGReceiver) ProposeDKGComplaint(
 	complaint *typesDKG.Complaint) {
-	if err := recv.authModule.SignDKGComplaint(complaint); err != nil {
+	if err := recv.signer.SignDKGComplaint(complaint); err != nil {
 		recv.logger.Error("Failed to sign DKG complaint", "error", err)
 		return
 	}
@@ -282,7 +282,7 @@ func (recv *consensusDKGReceiver) ProposeDKGComplaint(
 // ProposeDKGMasterPublicKey propose a DKGMasterPublicKey.
 func (recv *consensusDKGReceiver) ProposeDKGMasterPublicKey(
 	mpk *typesDKG.MasterPublicKey) {
-	if err := recv.authModule.SignDKGMasterPublicKey(mpk); err != nil {
+	if err := recv.signer.SignDKGMasterPublicKey(mpk); err != nil {
 		recv.logger.Error("Failed to sign DKG master public key", "error", err)
 		return
 	}
@@ -293,7 +293,7 @@ func (recv *consensusDKGReceiver) ProposeDKGMasterPublicKey(
 // ProposeDKGPrivateShare propose a DKGPrivateShare.
 func (recv *consensusDKGReceiver) ProposeDKGPrivateShare(
 	prv *typesDKG.PrivateShare) {
-	if err := recv.authModule.SignDKGPrivateShare(prv); err != nil {
+	if err := recv.signer.SignDKGPrivateShare(prv); err != nil {
 		recv.logger.Error("Failed to sign DKG private share", "error", err)
 		return
 	}
@@ -320,7 +320,7 @@ func (recv *consensusDKGReceiver) ProposeDKGPrivateShare(
 func (recv *consensusDKGReceiver) ProposeDKGAntiNackComplaint(
 	prv *typesDKG.PrivateShare) {
 	if prv.ProposerID == recv.ID {
-		if err := recv.authModule.SignDKGPrivateShare(prv); err != nil {
+		if err := recv.signer.SignDKGPrivateShare(prv); err != nil {
 			recv.logger.Error("Failed sign DKG private share", "error", err)
 			return
 		}
@@ -331,7 +331,7 @@ func (recv *consensusDKGReceiver) ProposeDKGAntiNackComplaint(
 
 // ProposeDKGMPKReady propose a DKGMPKReady message.
 func (recv *consensusDKGReceiver) ProposeDKGMPKReady(ready *typesDKG.MPKReady) {
-	if err := recv.authModule.SignDKGMPKReady(ready); err != nil {
+	if err := recv.signer.SignDKGMPKReady(ready); err != nil {
 		recv.logger.Error("Failed to sign DKG ready", "error", err)
 		return
 	}
@@ -341,7 +341,7 @@ func (recv *consensusDKGReceiver) ProposeDKGMPKReady(ready *typesDKG.MPKReady) {
 
 // ProposeDKGFinalize propose a DKGFinalize message.
 func (recv *consensusDKGReceiver) ProposeDKGFinalize(final *typesDKG.Finalize) {
-	if err := recv.authModule.SignDKGFinalize(final); err != nil {
+	if err := recv.signer.SignDKGFinalize(final); err != nil {
 		recv.logger.Error("Failed to sign DKG finalize", "error", err)
 		return
 	}
@@ -352,8 +352,8 @@ func (recv *consensusDKGReceiver) ProposeDKGFinalize(final *typesDKG.Finalize) {
 // Consensus implements DEXON Consensus algorithm.
 type Consensus struct {
 	// Node Info.
-	ID         types.NodeID
-	authModule *Authenticator
+	ID     types.NodeID
+	signer *utils.Signer
 
 	// BA.
 	baMgr            *agreementMgr
@@ -399,10 +399,38 @@ func NewConsensus(
 	prv crypto.PrivateKey,
 	logger common.Logger) *Consensus {
 
+	return newConsensus(dMoment, app, gov, db, network, prv, logger, true)
+}
+
+// NewConsensusForSimulation creates an instance of Consensus for simulation,
+// the only difference with NewConsensus is nonblocking of app.
+func NewConsensusForSimulation(
+	dMoment time.Time,
+	app Application,
+	gov Governance,
+	db db.Database,
+	network Network,
+	prv crypto.PrivateKey,
+	logger common.Logger) *Consensus {
+
+	return newConsensus(dMoment, app, gov, db, network, prv, logger, false)
+}
+
+// newConsensus creates a Consensus instance.
+func newConsensus(
+	dMoment time.Time,
+	app Application,
+	gov Governance,
+	db db.Database,
+	network Network,
+	prv crypto.PrivateKey,
+	logger common.Logger,
+	usingNonBlocking bool) *Consensus {
+
 	// TODO(w): load latest blockHeight from DB, and use config at that height.
 	nodeSetCache := utils.NewNodeSetCache(gov)
-	// Setup auth module.
-	authModule := NewAuthenticator(prv)
+	// Setup signer module.
+	signer := utils.NewSigner(prv)
 	// Check if the application implement Debug interface.
 	var debugApp Debug
 	if a, ok := app.(Debug); ok {
@@ -413,13 +441,13 @@ func NewConsensus(
 	config := utils.GetConfigWithPanic(gov, round, logger)
 	// Init lattice.
 	lattice := NewLattice(
-		dMoment, round, config, authModule, app, debugApp, db, logger)
+		dMoment, round, config, signer, app, debugApp, db, logger)
 	// Init configuration chain.
 	ID := types.NewNodeID(prv.PublicKey())
 	recv := &consensusDKGReceiver{
 		ID:           ID,
 		gov:          gov,
-		authModule:   authModule,
+		signer:       signer,
 		nodeSetCache: nodeSetCache,
 		network:      network,
 		logger:       logger,
@@ -432,12 +460,16 @@ func NewConsensus(
 		db,
 		logger)
 	recv.cfgModule = cfgModule
+	appModule := app
+	if usingNonBlocking {
+		appModule = newNonBlocking(app, debugApp)
+	}
 	// Construct Consensus instance.
 	con := &Consensus{
 		ID:               ID,
 		ccModule:         newCompactionChain(gov),
 		lattice:          lattice,
-		app:              newNonBlocking(app, debugApp),
+		app:              appModule,
 		debugApp:         debugApp,
 		gov:              gov,
 		db:               db,
@@ -447,7 +479,7 @@ func NewConsensus(
 		cfgModule:        cfgModule,
 		dMoment:          dMoment,
 		nodeSetCache:     nodeSetCache,
-		authModule:       authModule,
+		signer:           signer,
 		event:            common.NewEvent(),
 		logger:           logger,
 	}
@@ -479,14 +511,14 @@ func NewConsensusFromSyncer(
 	logger common.Logger) (*Consensus, error) {
 	// Setup the cache for node sets.
 	nodeSetCache := utils.NewNodeSetCache(gov)
-	// Setup auth module.
-	authModule := NewAuthenticator(prv)
+	// Setup signer module.
+	signer := utils.NewSigner(prv)
 	// Init configuration chain.
 	ID := types.NewNodeID(prv.PublicKey())
 	recv := &consensusDKGReceiver{
 		ID:           ID,
 		gov:          gov,
-		authModule:   authModule,
+		signer:       signer,
 		nodeSetCache: nodeSetCache,
 		network:      networkModule,
 		logger:       logger,
@@ -518,7 +550,7 @@ func NewConsensusFromSyncer(
 		cfgModule:        cfgModule,
 		dMoment:          initRoundBeginTime,
 		nodeSetCache:     nodeSetCache,
-		authModule:       authModule,
+		signer:           signer,
 		event:            common.NewEvent(),
 		logger:           logger,
 	}
@@ -569,7 +601,11 @@ func (con *Consensus) prepare(initBlock *types.Block) error {
 	// Setup lattice module.
 	initPlusOneCfg := utils.GetConfigWithPanic(con.gov, initRound+1, con.logger)
 	if err := con.lattice.AppendConfig(initRound+1, initPlusOneCfg); err != nil {
-		return err
+		if err == ErrRoundNotIncreasing {
+			err = nil
+		} else {
+			return err
+		}
 	}
 	// Register events.
 	dkgSet, err := con.nodeSetCache.GetDKGSet(initRound)
@@ -655,7 +691,7 @@ func (con *Consensus) runCRS(round uint64) {
 		round, utils.GetCRSWithPanic(con.gov, round, con.logger))
 	if err != nil {
 		con.logger.Error("Failed to prepare partial signature", "error", err)
-	} else if err = con.authModule.SignDKGPartialSignature(psig); err != nil {
+	} else if err = con.signer.SignDKGPartialSignature(psig); err != nil {
 		con.logger.Error("Failed to sign DKG partial signature", "error", err)
 	} else if err = con.cfgModule.processPartialSignature(psig); err != nil {
 		con.logger.Error("Failed to process partial signature", "error", err)
@@ -700,23 +736,37 @@ func (con *Consensus) initialRound(
 				}()
 			})
 	}
+	// checkCRS is a generator of checker to check if CRS for that round is
+	// ready or not.
+	checkCRS := func(round uint64) func() bool {
+		return func() bool {
+			nextCRS := con.gov.CRS(round)
+			if (nextCRS != common.Hash{}) {
+				return true
+			}
+			con.logger.Info("CRS is not ready yet. Try again later...",
+				"nodeID", con.ID,
+				"round", round)
+			return false
+		}
+	}
 	// Initiate BA modules.
 	con.event.RegisterTime(
 		startTime.Add(config.RoundInterval/2+config.LambdaDKG),
 		func(time.Time) {
 			go func(nextRound uint64) {
-				for (con.gov.CRS(nextRound) == common.Hash{}) {
-					con.logger.Info("CRS is not ready yet. Try again later...",
-						"nodeID", con.ID,
+				if !checkWithCancel(
+					con.ctx, 500*time.Millisecond, checkCRS(nextRound)) {
+					con.logger.Info("unable to prepare CRS for baMgr",
 						"round", nextRound)
-					time.Sleep(500 * time.Millisecond)
+					return
 				}
 				// Notify BA for new round.
 				nextConfig := utils.GetConfigWithPanic(
 					con.gov, nextRound, con.logger)
-				con.logger.Debug("Calling Governance.CRS",
-					"round", nextRound)
-				nextCRS := utils.GetCRSWithPanic(con.gov, nextRound, con.logger)
+				nextCRS := utils.GetCRSWithPanic(
+					con.gov, nextRound, con.logger)
+				con.logger.Info("appendConfig for baMgr", "round", nextRound)
 				if err := con.baMgr.appendConfig(
 					nextRound, nextConfig, nextCRS); err != nil {
 					panic(err)
@@ -729,11 +779,11 @@ func (con *Consensus) initialRound(
 			go func(nextRound uint64) {
 				// Normally, gov.CRS would return non-nil. Use this for in case of
 				// unexpected network fluctuation and ensure the robustness.
-				for (con.gov.CRS(nextRound) == common.Hash{}) {
-					con.logger.Info("CRS is not ready yet. Try again later...",
-						"nodeID", con.ID,
+				if !checkWithCancel(
+					con.ctx, 500*time.Millisecond, checkCRS(nextRound)) {
+					con.logger.Info("unable to prepare CRS for DKG set",
 						"round", nextRound)
-					time.Sleep(500 * time.Millisecond)
+					return
 				}
 				nextDkgSet, err := con.nodeSetCache.GetDKGSet(nextRound)
 				if err != nil {
@@ -933,7 +983,7 @@ func (con *Consensus) ProcessAgreementResult(
 	if err != nil {
 		return err
 	}
-	if err = con.authModule.SignDKGPartialSignature(psig); err != nil {
+	if err = con.signer.SignDKGPartialSignature(psig); err != nil {
 		return err
 	}
 	if err = con.cfgModule.processPartialSignature(psig); err != nil {
@@ -1123,7 +1173,7 @@ func (con *Consensus) prepareBlock(b *types.Block,
 		err = ErrCRSNotReady
 		return
 	}
-	if err = con.authModule.SignCRS(b, crs); err != nil {
+	if err = con.signer.SignCRS(b, crs); err != nil {
 		return
 	}
 	return
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go
index ef12cf992..492271e98 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/dkg-tsig-protocol.go
@@ -155,7 +155,6 @@ func newDKGProtocol(
 	prvShare, pubShare := dkg.NewPrivateKeyShares(threshold)
 
 	recv.ProposeDKGMasterPublicKey(&typesDKG.MasterPublicKey{
-		ProposerID:      ID,
 		Round:           round,
 		DKGID:           newDKGID(ID),
 		PublicKeyShares: *pubShare,
@@ -195,7 +194,6 @@ func (d *dkgProtocol) processMasterPublicKeys(
 			return ErrIDShareNotFound
 		}
 		d.recv.ProposeDKGPrivateShare(&typesDKG.PrivateShare{
-			ProposerID:   d.ID,
 			ReceiverID:   mpk.ProposerID,
 			Round:        d.round,
 			PrivateShare: *share,
@@ -210,8 +208,7 @@ func (d *dkgProtocol) proposeNackComplaints() {
 			continue
 		}
 		d.recv.ProposeDKGComplaint(&typesDKG.Complaint{
-			ProposerID: d.ID,
-			Round:      d.round,
+			Round: d.round,
 			PrivateShare: typesDKG.PrivateShare{
 				ProposerID: nID,
 				Round:      d.round,
@@ -240,7 +237,6 @@ func (d *dkgProtocol) processNackComplaints(complaints []*typesDKG.Complaint) (
 			continue
 		}
 		d.recv.ProposeDKGAntiNackComplaint(&typesDKG.PrivateShare{
-			ProposerID:   d.ID,
 			ReceiverID:   complaint.ProposerID,
 			Round:        d.round,
 			PrivateShare: *share,
@@ -267,8 +263,7 @@ func (d *dkgProtocol) enforceNackComplaints(complaints []*typesDKG.Complaint) {
 		if _, exist :=
 			d.antiComplaintReceived[from][to]; !exist {
 			d.recv.ProposeDKGComplaint(&typesDKG.Complaint{
-				ProposerID: d.ID,
-				Round:      d.round,
+				Round: d.round,
 				PrivateShare: typesDKG.PrivateShare{
 					ProposerID: to,
 					Round:      d.round,
@@ -282,7 +277,7 @@ func (d *dkgProtocol) sanityCheck(prvShare *typesDKG.PrivateShare) error {
 	if _, exist := d.idMap[prvShare.ProposerID]; !exist {
 		return ErrNotDKGParticipant
 	}
-	ok, err := verifyDKGPrivateShareSignature(prvShare)
+	ok, err := utils.VerifyDKGPrivateShareSignature(prvShare)
 	if err != nil {
 		return err
 	}
@@ -318,7 +313,6 @@ func (d *dkgProtocol) processPrivateShare(
 			return nil
 		}
 		complaint := &typesDKG.Complaint{
-			ProposerID:   d.ID,
 			Round:        d.round,
 			PrivateShare: *prvShare,
 		}
@@ -546,7 +540,7 @@ func (tsig *tsigProtocol) sanityCheck(psig *typesDKG.PartialSignature) error {
 	if !exist {
 		return ErrNotQualifyDKGParticipant
 	}
-	ok, err := verifyDKGPartialSignatureSignature(psig)
+	ok, err := utils.VerifyDKGPartialSignatureSignature(psig)
 	if err != nil {
 		return err
 	}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice.go
index 8780bbaec..db19cf910 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/lattice.go
@@ -25,6 +25,7 @@ import (
 	"github.com/dexon-foundation/dexon-consensus/common"
 	"github.com/dexon-foundation/dexon-consensus/core/db"
 	"github.com/dexon-foundation/dexon-consensus/core/types"
+	"github.com/dexon-foundation/dexon-consensus/core/utils"
 )
 
 // Errors for sanity check error.
@@ -34,15 +35,15 @@ var (
 
 // Lattice represents a unit to produce a global ordering from multiple chains.
 type Lattice struct {
-	lock       sync.RWMutex
-	authModule *Authenticator
-	app        Application
-	debug      Debug
-	pool       blockPool
-	data       *latticeData
-	toModule   *totalOrdering
-	ctModule   *consensusTimestamp
-	logger     common.Logger
+	lock     sync.RWMutex
+	signer   *utils.Signer
+	app      Application
+	debug    Debug
+	pool     blockPool
+	data     *latticeData
+	toModule *totalOrdering
+	ctModule *consensusTimestamp
+	logger   common.Logger
 }
 
 // NewLattice constructs an Lattice instance.
@@ -50,7 +51,7 @@ func NewLattice(
 	dMoment time.Time,
 	round uint64,
 	cfg *types.Config,
-	authModule *Authenticator,
+	signer *utils.Signer,
 	app Application,
 	debug Debug,
 	db db.Database,
@@ -58,14 +59,14 @@ func NewLattice(
 
 	// Create genesis latticeDataConfig.
 	return &Lattice{
-		authModule: authModule,
-		app:        app,
-		debug:      debug,
-		pool:       newBlockPool(cfg.NumChains),
-		data:       newLatticeData(db, dMoment, round, cfg),
-		toModule:   newTotalOrdering(dMoment, round, cfg),
-		ctModule:   newConsensusTimestamp(dMoment, round, cfg.NumChains),
-		logger:     logger,
+		signer:   signer,
+		app:      app,
+		debug:    debug,
+		pool:     newBlockPool(cfg.NumChains),
+		data:     newLatticeData(db, dMoment, round, cfg),
+		toModule: newTotalOrdering(dMoment, round, cfg),
+		ctModule: newConsensusTimestamp(dMoment, round, cfg.NumChains),
+		logger:   logger,
 	}
 }
 
@@ -89,7 +90,7 @@ func (l *Lattice) PrepareBlock(
 	if b.Witness, err = l.app.PrepareWitness(b.Witness.Height); err != nil {
 		return
 	}
-	if err = l.authModule.SignBlock(b); err != nil {
+	if err = l.signer.SignBlock(b); err != nil {
 		return
 	}
 	return
@@ -102,7 +103,7 @@ func (l *Lattice) PrepareEmptyBlock(b *types.Block) (err error) {
 	if err = l.data.prepareEmptyBlock(b); err != nil {
 		return
 	}
-	if b.Hash, err = hashBlock(b); err != nil {
+	if b.Hash, err = utils.HashBlock(b); err != nil {
 		return
 	}
 	return
@@ -116,7 +117,7 @@ func (l *Lattice) SanityCheck(b *types.Block) (err error) {
 	if b.IsEmpty() {
 		// Only need to verify block's hash.
 		var hash common.Hash
-		if hash, err = hashBlock(b); err != nil {
+		if hash, err = utils.HashBlock(b); err != nil {
 			return
 		}
 		if b.Hash != hash {
@@ -124,7 +125,7 @@ func (l *Lattice) SanityCheck(b *types.Block) (err error) {
 		}
 	} else {
 		// Verify block's signature.
-		if err = l.authModule.VerifyBlock(b); err != nil {
+		if err = utils.VerifyBlockSignature(b); err != nil {
 			return
 		}
 	}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/leader-selector.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/leader-selector.go
index a68f8ab66..94d28faeb 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/leader-selector.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/leader-selector.go
@@ -25,6 +25,7 @@ import (
 	"github.com/dexon-foundation/dexon-consensus/common"
 	"github.com/dexon-foundation/dexon-consensus/core/crypto"
 	"github.com/dexon-foundation/dexon-consensus/core/types"
+	"github.com/dexon-foundation/dexon-consensus/core/utils"
 )
 
 // Errors for leader module.
@@ -121,7 +122,7 @@ func (l *leaderSelector) leaderBlockHash() common.Hash {
 }
 
 func (l *leaderSelector) processBlock(block *types.Block) error {
-	ok, err := verifyCRSSignature(block, l.hashCRS)
+	ok, err := utils.VerifyCRSSignature(block, l.hashCRS)
 	if err != nil {
 		return err
 	}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/syncer/consensus.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/syncer/consensus.go
index da9d352f4..32bbab3b2 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/syncer/consensus.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/syncer/consensus.go
@@ -127,7 +127,7 @@ func (con *Consensus) initConsensusObj(initBlock *types.Block) {
 			con.roundBeginTimes[con.latticeLastRound],
 			con.latticeLastRound,
 			cfg,
-			core.NewAuthenticator(con.prv),
+			utils.NewSigner(con.prv),
 			con.app,
 			debugApp,
 			con.db,
@@ -446,9 +446,10 @@ func (con *Consensus) SyncBlocks(
 			return false, err
 		}
 		if syncBlock != nil {
-			con.logger.Info("deliver set found", syncBlock)
+			con.logger.Info("deliver set found", "block", syncBlock)
 			// New lattice with the round of syncBlock.
 			con.initConsensusObj(syncBlock)
+			con.setupConfigs(blocks)
 			// Process blocks from syncBlock to blocks' last block.
 			b := blocks[len(blocks)-1]
 			blocksCount := b.Finalization.Height - syncBlock.Finalization.Height + 1
@@ -586,7 +587,7 @@ func (con *Consensus) setupConfigs(blocks []*types.Block) {
 	con.resizeByNumChains(curMaxNumChains)
 	// Notify core.Lattice for new configs.
 	if con.lattice != nil {
-		for con.latticeLastRound+1 <= maxRound {
+		for con.latticeLastRound+1 <= untilRound {
 			con.latticeLastRound++
 			if err := con.lattice.AppendConfig(
 				con.latticeLastRound,
@@ -714,14 +715,12 @@ func (con *Consensus) startCRSMonitor() {
 			select {
 			case <-con.ctx.Done():
 				return
-			case <-time.After(1 * time.Second):
-				// Notify agreement modules for the latest round that CRS is
-				// available if the round is not notified yet.
-				var crsRound = lastNotifiedRound
-				for (con.gov.CRS(crsRound+1) != common.Hash{}) {
-					crsRound++
-				}
-				notifyNewCRS(crsRound)
+			case <-time.After(500 * time.Millisecond):
+			}
+			// Notify agreement modules for the latest round that CRS is
+			// available if the round is not notified yet.
+			if (con.gov.CRS(lastNotifiedRound+1) != common.Hash{}) {
+				notifyNewCRS(lastNotifiedRound + 1)
 			}
 		}
 	}()
@@ -732,7 +731,10 @@ func (con *Consensus) stopAgreement() {
 		con.lock.Lock()
 		defer con.lock.Unlock()
 		for _, a := range con.agreements {
-			close(a.inputChan)
+			if a.inputChan != nil {
+				close(a.inputChan)
+				a.inputChan = nil
+			}
 		}
 	}()
 	con.agreementWaitGroup.Wait()
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering.go
index 3bf6946ae..744471a84 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/total-ordering.go
@@ -19,6 +19,7 @@ package core
 
 import (
 	"errors"
+	"fmt"
 	"math"
 	"sort"
 	"sync"
@@ -1017,7 +1018,7 @@ func (to *totalOrdering) generateDeliverSet() (
 		chainID, otherChainID uint32
 		info, otherInfo       *totalOrderingCandidateInfo
 		precedings            = make(map[uint32]struct{})
-		cfg                   = to.configs[to.curRound-to.configs[0].roundID]
+		cfg                   = to.getCurrentConfig()
 	)
 	mode = TotalOrderingModeNormal
 	to.globalVector.updateCandidateInfo(to.dirtyChainIDs, to.objCache)
@@ -1162,7 +1163,7 @@ func (to *totalOrdering) flushBlocks(
 	b *types.Block) (flushed []*types.Block, mode uint32, err error) {
 
 	mode = TotalOrderingModeFlush
-	cfg := to.configs[to.curRound-to.configs[0].roundID]
+	cfg := to.getCurrentConfig()
 	if cfg.isLastBlock(b) {
 		to.flushReadyChains[b.Position.ChainID] = struct{}{}
 	}
@@ -1216,7 +1217,7 @@ func (to *totalOrdering) flushBlocks(
 	to.globalVector.cachedCandidateInfo = nil
 	to.switchRound()
 	// Force picking new candidates.
-	numChains := to.configs[to.curRound-to.configs[0].roundID].numChains
+	numChains := to.getCurrentConfig().numChains
 	to.output(map[common.Hash]struct{}{}, numChains)
 	return
 }
@@ -1226,7 +1227,7 @@ func (to *totalOrdering) deliverBlocks() (
 	delivered []*types.Block, mode uint32, err error) {
 
 	hashes, mode := to.generateDeliverSet()
-	cfg := to.configs[to.curRound-to.configs[0].roundID]
+	cfg := to.getCurrentConfig()
 	// Output precedings.
 	delivered = to.output(hashes, cfg.numChains)
 	// Check if any block in delivered set is the last block in this round, if
@@ -1271,12 +1272,21 @@ func (to *totalOrdering) deliverBlocks() (
 	return
 }
 
+func (to *totalOrdering) getCurrentConfig() *totalOrderingConfig {
+	cfgIdx := to.curRound - to.configs[0].roundID
+	if cfgIdx >= uint64(len(to.configs)) {
+		panic(fmt.Errorf("total ordering config is not ready: %v, %v, %v",
+			to.curRound, to.configs[0].roundID, len(to.configs)))
+	}
+	return to.configs[cfgIdx]
+}
+
 // processBlock is the entry point of totalOrdering.
 func (to *totalOrdering) processBlock(
 	b *types.Block) ([]*types.Block, uint32, error) {
 	// NOTE: Block b is assumed to be in topologically sorted, i.e., all its
 	// acking blocks are during or after total ordering stage.
-	cfg := to.configs[to.curRound-to.configs[0].roundID]
+	cfg := to.getCurrentConfig()
 	to.pendings[b.Hash] = b
 	to.buildBlockRelation(b)
 	isOldest, err := to.updateVectors(b)
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/utils.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils.go
index 671d68018..0c2d15588 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/utils.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils.go
@@ -18,6 +18,7 @@
 package core
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"math/rand"
@@ -146,27 +147,6 @@ func HashConfigurationBlock(
 	)
 }
 
-// VerifyBlock verifies the signature of types.Block.
-func VerifyBlock(b *types.Block) (err error) {
-	hash, err := hashBlock(b)
-	if err != nil {
-		return
-	}
-	if hash != b.Hash {
-		err = ErrIncorrectHash
-		return
-	}
-	pubKey, err := crypto.SigToPub(b.Hash, b.Signature)
-	if err != nil {
-		return
-	}
-	if !b.ProposerID.Equal(types.NewNodeID(pubKey)) {
-		err = ErrIncorrectSignature
-		return
-	}
-	return
-}
-
 // VerifyAgreementResult perform sanity check against a types.AgreementResult
 // instance.
 func VerifyAgreementResult(
@@ -201,7 +181,7 @@ func VerifyAgreementResult(
 		if _, exist := notarySet[vote.ProposerID]; !exist {
 			return ErrIncorrectVoteProposer
 		}
-		ok, err := verifyVoteSignature(&vote)
+		ok, err := utils.VerifyVoteSignature(&vote)
 		if err != nil {
 			return err
 		}
@@ -235,3 +215,22 @@ func isTravisCI() bool {
 func getDKGThreshold(config *types.Config) int {
 	return int(config.DKGSetSize/3) + 1
 }
+
+// checkWithCancel is a helper to perform periodic checking with cancel.
+func checkWithCancel(parentCtx context.Context, interval time.Duration,
+	checker func() bool) (ret bool) {
+	ctx, cancel := context.WithCancel(parentCtx)
+	defer cancel()
+Loop:
+	for {
+		select {
+		case <-ctx.Done():
+			break Loop
+		case <-time.After(interval):
+		}
+		if ret = checker(); ret {
+			return
+		}
+	}
+	return
+}
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/crypto.go
index d4a7f0ead..60424115e 100644
--- a/vendor/github.com/dexon-foundation/dexon-consensus/core/crypto.go
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/crypto.go
@@ -15,7 +15,7 @@
 // along with the dexon-consensus library. If not, see
 // <http://www.gnu.org/licenses/>.
 
-package core
+package utils
 
 import (
 	"encoding/binary"
@@ -34,7 +34,8 @@ func hashWitness(witness *types.Witness) (common.Hash, error) {
 		witness.Data), nil
 }
 
-func hashBlock(block *types.Block) (common.Hash, error) {
+// HashBlock generates hash of a types.Block.
+func HashBlock(block *types.Block) (common.Hash, error) {
 	hashPosition := hashPosition(block.Position)
 	// Handling Block.Acks.
 	binaryAcks := make([][]byte, len(block.Acks))
@@ -62,13 +63,31 @@ func hashBlock(block *types.Block) (common.Hash, error) {
 	return hash, nil
 }
 
-func verifyBlockSignature(pubkey crypto.PublicKey,
-	block *types.Block, sig crypto.Signature) (bool, error) {
-	hash, err := hashBlock(block)
+// VerifyBlockSignature verifies the signature of types.Block.
+func VerifyBlockSignature(b *types.Block) (err error) {
+	payloadHash := crypto.Keccak256Hash(b.Payload)
+	if payloadHash != b.PayloadHash {
+		err = ErrIncorrectHash
+		return
+	}
+	hash, err := HashBlock(b)
 	if err != nil {
-		return false, err
+		return
 	}
-	return pubkey.VerifySignature(hash, sig), nil
+	if hash != b.Hash {
+		err = ErrIncorrectHash
+		return
+	}
+	pubKey, err := crypto.SigToPub(b.Hash, b.Signature)
+	if err != nil {
+		return
+	}
+	if !b.ProposerID.Equal(types.NewNodeID(pubKey)) {
+		err = ErrIncorrectSignature
+		return
+	}
+	return
+
 }
 
 func hashVote(vote *types.Vote) common.Hash {
@@ -87,7 +106,8 @@ func hashVote(vote *types.Vote) common.Hash {
 	return hash
 }
 
-func verifyVoteSignature(vote *types.Vote) (bool, error) {
+// VerifyVoteSignature verifies the signature of types.Vote.
+func VerifyVoteSignature(vote *types.Vote) (bool, error) {
 	hash := hashVote(vote)
 	pubKey, err := crypto.SigToPub(hash, vote.Signature)
 	if err != nil {
@@ -104,7 +124,8 @@ func hashCRS(block *types.Block, crs common.Hash) common.Hash {
 	return crypto.Keccak256Hash(crs[:], hashPos[:])
 }
 
-func verifyCRSSignature(block *types.Block, crs common.Hash) (
+// VerifyCRSSignature verifies the CRS signature of types.Block.
+func VerifyCRSSignature(block *types.Block, crs common.Hash) (
 	bool, error) {
 	hash := hashCRS(block, crs)
 	pubKey, err := crypto.SigToPub(hash, block.CRSSignature)
@@ -146,7 +167,9 @@ func hashDKGPrivateShare(prvShare *typesDKG.PrivateShare) common.Hash {
 	)
 }
 
-func verifyDKGPrivateShareSignature(
+// VerifyDKGPrivateShareSignature verifies the signature of
+// typesDKG.PrivateShare.
+func VerifyDKGPrivateShareSignature(
 	prvShare *typesDKG.PrivateShare) (bool, error) {
 	hash := hashDKGPrivateShare(prvShare)
 	pubKey, err := crypto.SigToPub(hash, prvShare.Signature)
@@ -213,7 +236,7 @@ func VerifyDKGComplaintSignature(
 		return false, nil
 	}
 	if !complaint.IsNack() {
-		return verifyDKGPrivateShareSignature(&complaint.PrivateShare)
+		return VerifyDKGPrivateShareSignature(&complaint.PrivateShare)
 	}
 	return true, nil
 }
@@ -230,7 +253,9 @@ func hashDKGPartialSignature(psig *typesDKG.PartialSignature) common.Hash {
 	)
 }
 
-func verifyDKGPartialSignatureSignature(
+// VerifyDKGPartialSignatureSignature verifies the signature of
+// typesDKG.PartialSignature.
+func VerifyDKGPartialSignatureSignature(
 	psig *typesDKG.PartialSignature) (bool, error) {
 	hash := hashDKGPartialSignature(psig)
 	pubKey, err := crypto.SigToPub(hash, psig.Signature)
diff --git a/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/signer.go b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/signer.go
new file mode 100644
index 000000000..47bea3f3d
--- /dev/null
+++ b/vendor/github.com/dexon-foundation/dexon-consensus/core/utils/signer.go
@@ -0,0 +1,126 @@
+// Copyright 2018 The dexon-consensus Authors
+// This file is part of the dexon-consensus library.
+//
+// The dexon-consensus library is free software: you can redistribute it
+// and/or modify it under the terms of the GNU Lesser General Public License as
+// published by the Free Software Foundation, either version 3 of the License,
+// or (at your option) any later version.
+//
+// The dexon-consensus library is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+// General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the dexon-consensus library. If not, see
+// <http://www.gnu.org/licenses/>.
+
+package utils
+
+import (
+	"errors"
+
+	"github.com/dexon-foundation/dexon-consensus/common"
+	"github.com/dexon-foundation/dexon-consensus/core/crypto"
+	"github.com/dexon-foundation/dexon-consensus/core/types"
+	typesDKG "github.com/dexon-foundation/dexon-consensus/core/types/dkg"
+)
+
+// Errors for signer.
+var (
+	ErrInvalidProposerID  = errors.New("invalid proposer id")
+	ErrIncorrectHash      = errors.New("hash of block is incorrect")
+	ErrIncorrectSignature = errors.New("signature of block is incorrect")
+)
+
+// Signer signs a segment of data.
+type Signer struct {
+	prvKey     crypto.PrivateKey
+	pubKey     crypto.PublicKey
+	proposerID types.NodeID
+}
+
+// NewSigner constructs an Signer instance.
+func NewSigner(prvKey crypto.PrivateKey) (s *Signer) {
+	s = &Signer{
+		prvKey: prvKey,
+		pubKey: prvKey.PublicKey(),
+	}
+	s.proposerID = types.NewNodeID(s.pubKey)
+	return
+}
+
+// SignBlock signs a types.Block.
+func (s *Signer) SignBlock(b *types.Block) (err error) {
+	b.ProposerID = s.proposerID
+	b.PayloadHash = crypto.Keccak256Hash(b.Payload)
+	if b.Hash, err = HashBlock(b); err != nil {
+		return
+	}
+	if b.Signature, err = s.prvKey.Sign(b.Hash); err != nil {
+		return
+	}
+	return
+}
+
+// SignVote signs a types.Vote.
+func (s *Signer) SignVote(v *types.Vote) (err error) {
+	v.ProposerID = s.proposerID
+	v.Signature, err = s.prvKey.Sign(hashVote(v))
+	return
+}
+
+// SignCRS signs CRS signature of types.Block.
+func (s *Signer) SignCRS(b *types.Block, crs common.Hash) (err error) {
+	if b.ProposerID != s.proposerID {
+		err = ErrInvalidProposerID
+		return
+	}
+	b.CRSSignature, err = s.prvKey.Sign(hashCRS(b, crs))
+	return
+}
+
+// SignDKGComplaint signs a DKG complaint.
+func (s *Signer) SignDKGComplaint(complaint *typesDKG.Complaint) (err error) {
+	complaint.ProposerID = s.proposerID
+	complaint.Signature, err = s.prvKey.Sign(hashDKGComplaint(complaint))
+	return
+}
+
+// SignDKGMasterPublicKey signs a DKG master public key.
+func (s *Signer) SignDKGMasterPublicKey(
+	mpk *typesDKG.MasterPublicKey) (err error) {
+	mpk.ProposerID = s.proposerID
+	mpk.Signature, err = s.prvKey.Sign(hashDKGMasterPublicKey(mpk))
+	return
+}
+
+// SignDKGPrivateShare signs a DKG private share.
+func (s *Signer) SignDKGPrivateShare(
+	prvShare *typesDKG.PrivateShare) (err error) {
+	prvShare.ProposerID = s.proposerID
+	prvShare.Signature, err = s.prvKey.Sign(hashDKGPrivateShare(prvShare))
+	return
+}
+
+// SignDKGPartialSignature signs a DKG partial signature.
+func (s *Signer) SignDKGPartialSignature(
+	pSig *typesDKG.PartialSignature) (err error) {
+	pSig.ProposerID = s.proposerID
+	pSig.Signature, err = s.prvKey.Sign(hashDKGPartialSignature(pSig))
+	return
+}
+
+// SignDKGMPKReady signs a DKG ready message.
+func (s *Signer) SignDKGMPKReady(ready *typesDKG.MPKReady) (err error) {
+	ready.ProposerID = s.proposerID
+	ready.Signature, err = s.prvKey.Sign(hashDKGMPKReady(ready))
+	return
+}
+
+// SignDKGFinalize signs a DKG finalize message.
+func (s *Signer) SignDKGFinalize(final *typesDKG.Finalize) (err error) {
+	final.ProposerID = s.proposerID
+	final.Signature, err = s.prvKey.Sign(hashDKGFinalize(final))
+	return
+}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 56b294989..a1c2eb19f 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -105,14 +105,14 @@
 		{
 			"checksumSHA1": "65L1yf+f0OCiLFniljqfRxVdsQA=",
 			"path": "github.com/dexon-foundation/dexon-consensus/common",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
-			"checksumSHA1": "DxtHhW/eYFodiPxgwu7opvIhJu0=",
+			"checksumSHA1": "GuNkyaDFHBDzOV5un2efH5CBG7k=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
 			"checksumSHA1": "v4fKR7uhoyufi6hAVO44cFEb+tY=",
@@ -123,50 +123,50 @@
 		{
 			"checksumSHA1": "tQSbYCu5P00lUhKsx3IbBZCuSLY=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
 			"checksumSHA1": "W2P7pkuJ+26BpJg03K4Y0nB5obI=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto/dkg",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
 			"checksumSHA1": "6Pf6caC8LTNCI7IflFmglKYnxYo=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/crypto/ecdsa",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
 			"checksumSHA1": "PJXR1OuWwVVYrdJMK3skPr1/8ls=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/db",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
-			"checksumSHA1": "VRDwO2+FQkeZFeuLfRFS9FUpdCc=",
+			"checksumSHA1": "ZQnoWpMJTicqu9UMKi+CPd5r3so=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/syncer",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
 			"checksumSHA1": "Z079qQV+aQV9A3kSJ0LbFjx5VO4=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/types",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
 			"checksumSHA1": "sY+2eiOoWvsNMvuPl9qQ+rlT9sA=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/types/dkg",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
-			"checksumSHA1": "WEtKiyBYr0oPUSF+smv1A2LPBuI=",
+			"checksumSHA1": "0JFlVFny0IyANnlelQDl8ot16wU=",
 			"path": "github.com/dexon-foundation/dexon-consensus/core/utils",
-			"revision": "146ed32cf841151b826eafd7d6ade188c56865bf",
-			"revisionTime": "2018-12-20T09:26:30Z"
+			"revision": "dce509a13ef5873b9cae3c1cabdb97e219b6fb7d",
+			"revisionTime": "2018-12-24T02:29:31Z"
 		},
 		{
 			"checksumSHA1": "TAkwduKZqLyimyTPPWIllZWYFuE=",