use gnark crypto lib

cmd/horcrux/cmd/shards_test.go

@@ -6,7 +6,10 @@ import (
 	"testing"
 
 	"github.com/cometbft/cometbft/crypto/ed25519"
+	cometjson "github.com/cometbft/cometbft/libs/json"
 	"github.com/cometbft/cometbft/privval"
+	"github.com/strangelove-ventures/horcrux/cmd/horcrux/cmd/testdata"
+	"github.com/strangelove-ventures/horcrux/signer"
 	"github.com/stretchr/testify/require"
 )
 
@@ -139,3 +142,57 @@ func TestRSAShards(t *testing.T) {
 		})
 	}
 }
+
+func TestPrivValidatorBn254(t *testing.T) {
+	bz := testdata.PrivValidatorKeyBn254
+	var privvalKey privval.FilePVKey
+	err := cometjson.Unmarshal(bz, &privvalKey)
+	require.NoError(t, err)
+
+	msg := []byte("hello")
+
+	sig, err := privvalKey.PrivKey.Sign(msg)
+	require.NoError(t, err)
+
+	valid := privvalKey.PrivKey.PubKey().VerifySignature(msg, sig)
+	require.True(t, valid)
+
+	valid = privvalKey.PubKey.VerifySignature(msg, sig)
+	require.True(t, valid)
+
+	shards, err := signer.CreateCosignerShards(&privvalKey, 2, 3)
+	require.NoError(t, err)
+
+	var signers = make([]*signer.ThresholdSignerSoftBn254, len(shards))
+	var sigs = make([][]byte, len(shards))
+
+	for i, shard := range shards {
+		signers[i], err = signer.NewThresholdSignerSoftBn254(&shard, 2, 3)
+		require.NoError(t, err)
+
+		sig, err = signers[i].Sign(nil, msg)
+		require.NoError(t, err)
+
+		sigs[i] = sig
+	}
+
+	var partialSigs = make([]signer.PartialSignature, 0, 2)
+	for i, sig := range sigs {
+		if i == 0 {
+			continue
+		}
+		partialSigs = append(partialSigs, signer.PartialSignature{
+			ID:        i + 1,
+			Signature: sig,
+		})
+	}
+
+	combinedSig, err := signers[0].CombineSignatures(partialSigs)
+	require.NoError(t, err)
+
+	valid = privvalKey.PrivKey.PubKey().VerifySignature(msg, combinedSig)
+	require.True(t, valid)
+
+	valid = privvalKey.PubKey.VerifySignature(msg, combinedSig)
+	require.True(t, valid)
+}

cmd/horcrux/cmd/testdata/priv_validator_key-bn254.json

@@ -0,0 +1,11 @@
+{
+    "address": "092F3E64DF1B43207DCB187747C7E35A0A8C277B",
+    "pub_key": {
+        "type": "tendermint/PubKeyBn254",
+        "value": "jX4uANsjStZrWdWurqaFKXB8AQjoUhd/GiZjeEAB01Y="
+    },
+    "priv_key": {
+        "type": "tendermint/PrivKeyBn254",
+        "value": "0sZKL1ORco5/VXVtoLSaF2QS4TmzZlBgctr1aUfja1gCXu6OqvPob9f2q7XnzSQRCL1gmY1SsYcoImN4iR/HSg=="
+    }
+}

cmd/horcrux/cmd/testdata/testdata.go

@@ -18,3 +18,6 @@ var CosignerRSAKeyMigrated string
 
 //go:embed cosigner-key-v2.json
 var CosignerKeyV2 []byte
+
+//go:embed priv_validator_key-bn254.json
+var PrivValidatorKeyBn254 []byte