diff --git a/README.md b/README.md
index 5cf46ff..7c74f0f 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@
 
 [![Travis CI](https://app.travis-ci.com/emmansun/gmsm.svg?branch=main)](https://app.travis-ci.com/emmansun/gmsm) 
 [![Github CI](https://github.com/emmansun/gmsm/actions/workflows/ci.yml/badge.svg)](https://github.com/emmansun/gmsm/actions/workflows/ci.yml) 
+[![Go Report Card]((https://goreportcard.com/report/github.com/emmansun/gmsm)](https://goreportcard.com/report/github.com/emmansun/gmsm)
 [![Documentation](https://godoc.org/github.com/emmansun/gmsm?status.svg)](https://godoc.org/github.com/emmansun/gmsm) 
 [![Release](https://img.shields.io/github/release/emmansun/gmsm/all.svg)](https://github.com/emmansun/gmsm/releases)
 
diff --git a/internal/sm2ec/sm2ec_test.go b/internal/sm2ec/sm2ec_test.go
index 20b35f4..29f0ec3 100644
--- a/internal/sm2ec/sm2ec_test.go
+++ b/internal/sm2ec/sm2ec_test.go
@@ -149,7 +149,7 @@ func TestNISTP256MontgomeryDomain(t *testing.T) {
 func TestForSqrt(t *testing.T) {
 	mod4 := new(big.Int).Mod(sm2Prime, big.NewInt(4))
 	if mod4.Cmp(big.NewInt(3)) != 0 {
-		t.Fatal("sm2 prime is not fufill 3 mod 4")
+		t.Fatal("sm2 prime is not fulfill 3 mod 4")
 	}
 
 	exp := new(big.Int).Add(sm2Prime, big.NewInt(1))
diff --git a/sm2/sm2_keyexchange.go b/sm2/sm2_keyexchange.go
index f642049..791a3f0 100644
--- a/sm2/sm2_keyexchange.go
+++ b/sm2/sm2_keyexchange.go
@@ -171,7 +171,7 @@ func (ke *KeyExchange) ConfirmResponder(rB *ecdsa.PublicKey, sB []byte) ([]byte,
 		return nil, errors.New("sm2: received invalid random from responder")
 	}
 	ke.peerSecret = rB
-	// Calcualte tA
+	// Calculate tA
 	t := (&big.Int{}).And(ke.w2Minus1, ke.secret.X)
 	t.Add(ke.w2, t)
 	t.Mul(t, ke.r)
diff --git a/sm2/sm2_test.go b/sm2/sm2_test.go
index 873f0cb..6e38de0 100644
--- a/sm2/sm2_test.go
+++ b/sm2/sm2_test.go
@@ -269,7 +269,7 @@ func TestNonceSafety(t *testing.T) {
 	}
 
 	if r0.Cmp(r1) == 0 {
-		t.Error("SM2: the nonce used for two diferent messages was the same")
+		t.Error("SM2: the nonce used for two different messages was the same")
 	}
 }
 
diff --git a/sm9/sm9.go b/sm9/sm9.go
index be257e1..3dde012 100644
--- a/sm9/sm9.go
+++ b/sm9/sm9.go
@@ -248,7 +248,7 @@ func (pub *EncryptMasterPublicKey) ScalarBaseMult(r *big.Int) *bn256.GT {
 	return bn256.ScalarBaseMultGT(tables, r)
 }
 
-// WrapKey generate and wrap key wtih reciever's uid and system hid
+// WrapKey generate and wrap key with reciever's uid and system hid
 func WrapKey(rand io.Reader, pub *EncryptMasterPublicKey, uid []byte, hid byte, kLen int) (key []byte, cipher *bn256.G1, err error) {
 	q := pub.GenerateUserPublicKey(uid, hid)
 	var r *big.Int