diff --git a/ecdsa/signing/local_party.go b/ecdsa/signing/local_party.go
index 2415fdc6..5d343055 100644
--- a/ecdsa/signing/local_party.go
+++ b/ecdsa/signing/local_party.go
@@ -101,22 +101,13 @@ type (
 )
 
 func NewLocalParty(
-	msg *big.Int,
-	params *tss.Parameters,
-	key keygen.LocalPartySaveData,
-	out chan<- tss.Message,
-	end chan<- *common.SignatureData) tss.Party {
-	return NewLocalPartyWithKDD(msg, params, key, nil, out, end, 0)
-}
-
-func NewLocalPartyWithLength(
 	msg *big.Int,
 	params *tss.Parameters,
 	key keygen.LocalPartySaveData,
 	out chan<- tss.Message,
 	end chan<- *common.SignatureData,
-	fullBytesLen int) tss.Party {
-	return NewLocalPartyWithKDD(msg, params, key, nil, out, end, fullBytesLen)
+	fullBytesLen ...int) tss.Party {
+	return NewLocalPartyWithKDD(msg, params, key, nil, out, end, fullBytesLen...)
 }
 
 // NewLocalPartyWithKDD returns a party with key derivation delta for HD support
@@ -127,7 +118,7 @@ func NewLocalPartyWithKDD(
 	keyDerivationDelta *big.Int,
 	out chan<- tss.Message,
 	end chan<- *common.SignatureData,
-	fullBytesLen int,
+	fullBytesLen ...int,
 ) tss.Party {
 	partyCount := len(params.Parties().IDs())
 	p := &LocalParty{
@@ -153,7 +144,11 @@ func NewLocalPartyWithKDD(
 	// temp data init
 	p.temp.keyDerivationDelta = keyDerivationDelta
 	p.temp.m = msg
-	p.temp.fullBytesLen = fullBytesLen
+	if len(fullBytesLen) > 0 {
+		p.temp.fullBytesLen = fullBytesLen[0]
+	} else {
+		p.temp.fullBytesLen = 0
+	}
 	p.temp.cis = make([]*big.Int, partyCount)
 	p.temp.bigWs = make([]*crypto.ECPoint, partyCount)
 	p.temp.betas = make([]*big.Int, partyCount)
diff --git a/ecdsa/signing/local_party_test.go b/ecdsa/signing/local_party_test.go
index fce2f182..33f41dc5 100644
--- a/ecdsa/signing/local_party_test.go
+++ b/ecdsa/signing/local_party_test.go
@@ -155,7 +155,7 @@ func TestE2EConcurrentWithLeadingZeroInMSG(t *testing.T) {
 	// init the parties
 	for i := 0; i < len(signPIDs); i++ {
 		params := tss.NewParameters(tss.S256(), p2pCtx, signPIDs[i], len(signPIDs), threshold)
-		P := NewLocalPartyWithLength(new(big.Int).SetBytes(msgData), params, keys[i], outCh, endCh, len(msgData)).(*LocalParty)
+		P := NewLocalParty(new(big.Int).SetBytes(msgData), params, keys[i], outCh, endCh, len(msgData)).(*LocalParty)
 		parties = append(parties, P)
 		go func(P *LocalParty) {
 			if err := P.Start(); err != nil {
diff --git a/eddsa/signing/local_party.go b/eddsa/signing/local_party.go
index 60e85ba2..52e474dc 100644
--- a/eddsa/signing/local_party.go
+++ b/eddsa/signing/local_party.go
@@ -72,28 +72,7 @@ func NewLocalParty(
 	key keygen.LocalPartySaveData,
 	out chan<- tss.Message,
 	end chan<- *common.SignatureData,
-) tss.Party {
-	return SetupNewLocalParty(msg, params, key, out, end, 0)
-}
-
-func NewLocalPartyWithLength(
-	msg *big.Int,
-	params *tss.Parameters,
-	key keygen.LocalPartySaveData,
-	out chan<- tss.Message,
-	end chan<- *common.SignatureData,
-	fullBytesLen int,
-) tss.Party {
-	return SetupNewLocalParty(msg, params, key, out, end, fullBytesLen)
-}
-
-func SetupNewLocalParty(
-	msg *big.Int,
-	params *tss.Parameters,
-	key keygen.LocalPartySaveData,
-	out chan<- tss.Message,
-	end chan<- *common.SignatureData,
-	fullBytesLen int,
+	fullBytesLen ...int,
 ) tss.Party {
 	partyCount := len(params.Parties().IDs())
 	p := &LocalParty{
@@ -112,7 +91,11 @@ func SetupNewLocalParty(
 
 	// temp data init
 	p.temp.m = msg
-	p.temp.fullBytesLen = fullBytesLen
+	if len(fullBytesLen) > 0 {
+		p.temp.fullBytesLen = fullBytesLen[0]
+	} else {
+		p.temp.fullBytesLen = 0
+	}
 	p.temp.cjs = make([]*big.Int, partyCount)
 	return p
 }
diff --git a/eddsa/signing/local_party_test.go b/eddsa/signing/local_party_test.go
index 638e9d48..a2c573e8 100644
--- a/eddsa/signing/local_party_test.go
+++ b/eddsa/signing/local_party_test.go
@@ -170,13 +170,7 @@ func TestE2EConcurrentWithLeadingZeroInMSG(t *testing.T) {
 	// init the parties
 	for i := 0; i < len(signPIDs); i++ {
 		params := tss.NewParameters(tss.Edwards(), p2pCtx, signPIDs[i], len(signPIDs), threshold)
-		P := NewLocalPartyWithLength(
-			new(big.Int).SetBytes(msg),
-			params,
-			keys[i],
-			outCh,
-			endCh,
-			len(msg)).(*LocalParty)
+		P := NewLocalParty(new(big.Int).SetBytes(msg), params, keys[i], outCh, endCh, len(msg)).(*LocalParty)
 		parties = append(parties, P)
 		go func(P *LocalParty) {
 			if err := P.Start(); err != nil {