Switch to signatures on G2, Resolves #96

Signed-off-by: Jakub Sztandera <oss@kubuxu.com>

blssig/aggregation.go

@@ -22,7 +22,7 @@ func (v Verifier) Aggregate(pubkeys []gpbft.PubKey, signatures [][]byte) ([]byte
 		return nil, xerrors.Errorf("converting public keys to mask: %w", err)
 	}
 
-	aggSigPoint, err := bdn.AggregateSignatures(v.suite, signatures, mask)
+	aggSigPoint, err := bdn.NewSchemeOnG2(v.suite).AggregateSignatures(signatures, mask)
 	if err != nil {
 		return nil, xerrors.Errorf("computing aggregate signature: %w", err)
 	}
@@ -40,7 +40,7 @@ func (v Verifier) VerifyAggregate(msg []byte, signature []byte, pubkeys []gpbft.
 		return xerrors.Errorf("converting public keys to mask: %w", err)
 	}
 
-	aggPubKey, err := bdn.AggregatePublicKeys(v.suite, mask)
+	aggPubKey, err := bdn.NewSchemeOnG2(v.suite).AggregatePublicKeys(mask)
 	if err != nil {
 		return xerrors.Errorf("aggregating public keys: %w", err)
 	}

blssig/signer.go

@@ -21,12 +21,12 @@ type Signer struct {
 	keys map[string]kyber.Scalar
 }
 
-func SignerWithKeyOnG2() *Signer {
+func SignerWithKeyOnG1() *Signer {
 	suite := bls12381.NewBLS12381Suite()
 	return &Signer{
 		suite:    suite,
-		scheme:   bls.NewSchemeOnG1(suite),
-		keyGroup: suite.G2(),
+		scheme:   bls.NewSchemeOnG2(suite),
+		keyGroup: suite.G1(),
 		keys:     make(map[string]kyber.Scalar),
 	}
 }

blssig/suite_test.go

@@ -9,6 +9,6 @@ import (
 
 func TestBLSSigning(t *testing.T) {
 	test.NewSigningSuite(
-		blssig.SignerWithKeyOnG2(),
-		blssig.VerifierWithKeyOnG2()).Run(t)
+		blssig.SignerWithKeyOnG1(),
+		blssig.VerifierWithKeyOnG1()).Run(t)
 }

blssig/verifier.go

@@ -14,11 +14,11 @@ type Verifier struct {
 	keyGroup kyber.Group
 }
 
-func VerifierWithKeyOnG2() Verifier {
+func VerifierWithKeyOnG1() Verifier {
 	suite := bls12381.NewBLS12381Suite()
 	return Verifier{
 		suite:    suite,
-		keyGroup: suite.G2(),
+		keyGroup: suite.G1(),
 	}
 }
 

sim/sim.go

@@ -48,8 +48,8 @@ func FakeSigningBacked() *SigningBacked {
 
 func BLSSigningBacked() *SigningBacked {
 	return &SigningBacked{
-		Signer:   blssig.SignerWithKeyOnG2(),
-		Verifier: blssig.VerifierWithKeyOnG2(),
+		Signer:   blssig.SignerWithKeyOnG1(),
+		Verifier: blssig.VerifierWithKeyOnG1(),
 	}
 }