From 2de78d9caefa77ce8cd4b66670f4f412bb7d6c86 Mon Sep 17 00:00:00 2001
From: sandy <18382255942@163.com>
Date: Sat, 10 Apr 2021 23:52:22 +0800
Subject: [PATCH] fix(): fix Ecrecover function bug

---
 utils.go      | 4 +++-
 utils_test.go | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/utils.go b/utils.go
index cd5ceb2..f38a344 100644
--- a/utils.go
+++ b/utils.go
@@ -35,7 +35,9 @@ func EIP712Hash(typedData core.TypedData) (hash []byte, err error) {
 	return
 }
 
-func Ecrecover(hash, sig []byte) (addr common.Address, err error) {
+func Ecrecover(hash, sigData []byte) (addr common.Address, err error) {
+	sig := make([]byte, len(sigData))
+	copy(sig, sigData)
 	if len(sig) != 65 {
 		err = fmt.Errorf("invalid length of signture: %d", len(sig))
 		return
diff --git a/utils_test.go b/utils_test.go
index 62dc846..2d43487 100644
--- a/utils_test.go
+++ b/utils_test.go
@@ -42,4 +42,8 @@ func TestEcrecover(t *testing.T) {
 	addr, err := Ecrecover(hash, sig)
 	assert.NoError(t, err)
 	assert.Equal(t, "0xab6c371B6c466BcF14d4003601951e5873dF2AcA", addr.String())
+	// run again
+	addr, err = Ecrecover(hash, sig)
+	assert.NoError(t, err)
+	assert.Equal(t, "0xab6c371B6c466BcF14d4003601951e5873dF2AcA", addr.String())
 }