fix: partial support for pubkey Bn254 (#99)

Related to #98

Author: MattKetmo

pkg/crypto/bls12_318.go

@@ -10,11 +10,11 @@ import (
 )
 
 const (
-	PubKeyName = "cometbft/PubKeyBls12_381"
+	Bls12PubKeyName = "cometbft/PubKeyBls12_381"
 )
 
 func init() {
-	cmtjson.RegisterType(Bls12PubKey{}, PubKeyName)
+	cmtjson.RegisterType(Bls12PubKey{}, Bls12PubKeyName)
 }
 
 var _ crypto.PubKey = Bls12PubKey{}

pkg/crypto/bn254.go

@@ -0,0 +1,55 @@
+package crypto
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/cometbft/cometbft/crypto"
+	"github.com/cometbft/cometbft/crypto/tmhash"
+	cmtjson "github.com/cometbft/cometbft/libs/json"
+)
+
+const (
+	Bn254PubKeyName = "cometbft/PubKeyBn254"
+)
+
+func init() {
+	cmtjson.RegisterType(Bn254PubKey{}, Bn254PubKeyName)
+}
+
+var _ crypto.PubKey = Bn254PubKey{}
+
+type Bn254PubKey []byte
+
+// Address is the SHA256-20 of the raw pubkey bytes.
+func (pubKey Bn254PubKey) Address() crypto.Address {
+	// if len(pubKey) != PubKeySize {
+	// 	panic("pubkey is incorrect size")
+	// }
+	return crypto.Address(tmhash.SumTruncated(pubKey))
+}
+
+// Bytes returns the PubKey byte format.
+func (pubKey Bn254PubKey) Bytes() []byte {
+	return []byte(pubKey)
+}
+
+func (pubKey Bn254PubKey) VerifySignature(msg []byte, sig []byte) bool {
+	return false
+}
+
+func (pubKey Bn254PubKey) String() string {
+	return fmt.Sprintf("PubKeyBn254{%X}", []byte(pubKey))
+}
+
+func (Bn254PubKey) Type() string {
+	return "Bn254"
+}
+
+func (pubKey Bn254PubKey) Equals(other crypto.PubKey) bool {
+	if otherEd, ok := other.(Bn254PubKey); ok {
+		return bytes.Equal(pubKey[:], otherEd[:])
+	}
+
+	return false
+}