feat(utils): add IsMessageSignatureCorrect

utils/signature.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/crypto"
+)
+
+// IsMessageSignatureCorrect checks whether the message ECDSA signature is correct.
+func IsMessageSignatureCorrect(address common.Address, msg, sig []byte) (bool, error) {
+	publicKey, err := crypto.SigToPub(accounts.TextHash(msg), sig)
+	if err != nil {
+		return false, err
+	}
+	return address == crypto.PubkeyToAddress(*publicKey), nil
+}

utils/signature_test.go

@@ -0,0 +1,25 @@
+package utils
+
+import (
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestIsMessageSignatureCorrect(t *testing.T) {
+	const message = "Hello, world!"
+	const signature = "0xb04f825363596418c630425916f73447d636094a75e47b45e2eb59d8a6c7d5035355f03b903b84700376f0efa23f3b095815776c5c6daf2b371a0a61b5f7034500"
+	address := common.HexToAddress("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049")
+	actual, err := IsMessageSignatureCorrect(address, []byte(message), common.FromHex(signature))
+	assert.NoError(t, err, "Should throw error for valid message signature")
+	assert.True(t, actual, "Message signature should be valid")
+}
+
+func TestIsMessageSignatureCorrectInvalidSignature(t *testing.T) {
+	const message = "Hello world"
+	const signature = "0xb04f825363596418c630425916f73447d636094a75e47b45e2eb59d8a6c7d5035355f03b903b84700376f0efa23f3b095815776c5c6daf2b371a0a61b5f7034500"
+	address := common.HexToAddress("0x36615Cf349d7F6344891B1e7CA7C72883F5dc049")
+	actual, err := IsMessageSignatureCorrect(address, []byte(message), common.FromHex(signature))
+	assert.NoError(t, err, "Should throw error for valid message signature")
+	assert.False(t, actual, "Message signature should be invalid")
+}