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mpc/verify.go

@@ -0,0 +1,29 @@
+package mpc
+
+import (
+	"crypto/ecdsa"
+
+	"golang.org/x/crypto/sha3"
+)
+
+func VerifyWithPubKey(pubKeyCompressed []byte, data []byte, sig []byte) (bool, error) {
+	edSig, err := DeserializeSignature(sig)
+	if err != nil {
+		return false, err
+	}
+	ePub, err := GetECDSAPoint(pubKeyCompressed)
+	if err != nil {
+		return false, err
+	}
+	pk := &ecdsa.PublicKey{
+		Curve: ePub.Curve,
+		X:     ePub.X,
+		Y:     ePub.Y,
+	}
+
+	// Hash the message using SHA3-256
+	hash := sha3.New256()
+	hash.Write(data)
+	digest := hash.Sum(nil)
+	return ecdsa.Verify(pk, digest, edSig.R, edSig.S), nil
+}