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keys/pubkey.go

@@ -0,0 +1,85 @@
+package keys
+
+import (
+	"bytes"
+	"crypto/ecdsa"
+	"encoding/hex"
+
+	p2pcrypto "github.com/libp2p/go-libp2p/core/crypto"
+	p2ppb "github.com/libp2p/go-libp2p/core/crypto/pb"
+	"github.com/sonr-io/sonr/crypto/core/curves"
+	"golang.org/x/crypto/sha3"
+)
+
+type PubKey interface {
+	Bytes() []byte
+	Raw() ([]byte, error)
+	Equals(b p2pcrypto.Key) bool
+	Type() p2ppb.KeyType
+	Hex() string
+	Verify(msg []byte, sig []byte) (bool, error)
+}
+
+type pubKey struct {
+	publicPoint curves.Point
+}
+
+func NewPubKey(pk curves.Point) PubKey {
+	return &pubKey{
+		publicPoint: pk,
+	}
+}
+
+func (p pubKey) Bytes() []byte {
+	return p.publicPoint.ToAffineCompressed()
+}
+
+func (p pubKey) Raw() ([]byte, error) {
+	return p.publicPoint.ToAffineCompressed(), nil
+}
+
+func (p pubKey) Equals(b p2pcrypto.Key) bool {
+	if b == nil {
+		return false
+	}
+	apbz, err := b.Raw()
+	if err != nil {
+		return false
+	}
+	bbz, err := p.Raw()
+	if err != nil {
+		return false
+	}
+	return bytes.Equal(apbz, bbz)
+}
+
+func (p pubKey) Hex() string {
+	return hex.EncodeToString(p.publicPoint.ToAffineCompressed())
+}
+
+func (p pubKey) Type() p2ppb.KeyType {
+	return p2ppb.KeyType_Secp256k1
+}
+
+func (p pubKey) Verify(data []byte, sigBz []byte) (bool, error) {
+	sig, err := deserializeSignature(sigBz)
+	if err != nil {
+		return false, err
+	}
+	pp, err := getEcdsaPoint(p.Bytes())
+	if err != nil {
+		return false, err
+	}
+	pk := &ecdsa.PublicKey{
+		Curve: pp.Curve,
+		X:     pp.X,
+		Y:     pp.Y,
+	}
+
+	// Hash the message using SHA3-256
+	hash := sha3.New256()
+	hash.Write(data)
+	digest := hash.Sum(nil)
+
+	return ecdsa.Verify(pk, digest, sig.R, sig.S), nil
+}