diff --git a/go/gmssl/sm3/sm3.go b/go/gmssl/sm3/sm3.go
new file mode 100644
index 00000000..3f43bf37
--- /dev/null
+++ b/go/gmssl/sm3/sm3.go
@@ -0,0 +1,57 @@
+package sm3
+
+import (
+	"gmssl"
+	"hash"
+)
+
+type digest struct {
+	ctx *gmssl.DigestContext
+}
+
+func New() hash.Hash {
+	d := new(digest)
+	ctx, err := gmssl.NewDigestContext("SM3", nil)
+	if err != nil {
+		return nil
+	}
+	d.ctx = ctx
+	return d
+}
+
+func (d *digest) BlockSize() int {
+	ret, err := gmssl.GetDigestBlockSize("SM3")
+	if err != nil {
+		return 0
+	}
+	return ret
+}
+
+func (d *digest) Size() int {
+	ret, err := gmssl.GetDigestLength("SM3")
+	if err != nil {
+		return 0
+	}
+	return ret
+}
+
+func (d *digest) Reset() {
+	err := d.ctx.Reset()
+	if err != nil {
+		// do something?
+	}
+}
+
+func (d *digest) Write(p []byte) (int, error) {
+	err := d.ctx.Update(p)
+	return len(p), err
+}
+
+func (d *digest) Sum(in []byte) []byte {
+	d.ctx.Update(in)
+	ret, err := d.ctx.Final()
+	if err != nil {
+		return nil
+	}
+	return ret
+}
diff --git a/go/gmssltest/gmssltest.go b/go/gmssltest/gmssltest.go
index 886455de..3f4e2581 100644
--- a/go/gmssltest/gmssltest.go
+++ b/go/gmssltest/gmssltest.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"gmssl"
+	"gmssl/sm3"
 	"fmt"
 )
 
@@ -29,37 +30,41 @@ func main() {
 	fmt.Println("");
 
 	/* sm3 digest */
-	sm3, err := gmssl.NewDigestContext("SM3", nil)
+	sm3ctx, err := gmssl.NewDigestContext("SM3", nil)
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
-	if err := sm3.Update([]byte("a")); err != nil {
+	if err := sm3ctx.Update([]byte("a")); err != nil {
 		fmt.Println(err)
 		return
 	}
-	if err := sm3.Update([]byte("bc")); err != nil {
+	if err := sm3ctx.Update([]byte("bc")); err != nil {
 		fmt.Println(err)
 		return
 	}
-	sm3digest, err := sm3.Final()
+	sm3digest, err := sm3ctx.Final()
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
 	fmt.Printf("sm3(\"abc\") = %x\n", sm3digest)
 
+	sm3hash := sm3.New()
+	sm3hash.Write([]byte("abc"))
+	fmt.Printf("sm3(\"abc\") = %x\n", sm3hash.Sum(nil))
+
 	/* hmac-sm3 */
 	hmac_sm3, err := gmssl.NewHMACContext("SM3", nil, []byte("this is the key"))
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
-	if err := hmac_sm3.Update([]byte("hello")); err != nil {
+	if err := hmac_sm3.Update([]byte("ab")); err != nil {
 		fmt.Println(err)
 		return
 	}
-	if err := hmac_sm3.Update([]byte("world")); err != nil {
+	if err := hmac_sm3.Update([]byte("c")); err != nil {
 		fmt.Println(err)
 		return
 	}
@@ -68,7 +73,7 @@ func main() {
 		fmt.Println(err)
 		return
 	}
-	fmt.Printf("hmac-sm3() = %x\n", mactag)
+	fmt.Printf("hmac-sm3(\"abc\") = %x\n", mactag)
 
 	/* generate random key */
 	keylen, err := gmssl.GetCipherKeyLength("SMS4")
@@ -113,7 +118,6 @@ func main() {
 	ciphertext := make([]byte, 0, len(ciphertext1) + len(ciphertext2))
 	ciphertext = append(ciphertext, ciphertext1...)
 	ciphertext = append(ciphertext, ciphertext2...)
-	fmt.Printf("sms4(\"hello\") = %x\n", ciphertext)
 
 	/* decrypt */
 	decryptor, err := gmssl.NewCipherContext("SMS4", nil, key, iv, false)
@@ -134,7 +138,8 @@ func main() {
 	plaintext := make([]byte, 0, len(plaintext1) + len(plaintext2))
 	plaintext = append(plaintext, plaintext1...)
 	plaintext = append(plaintext, plaintext2...)
-	fmt.Println(string(plaintext))
+
+	fmt.Printf("sms4(\"%s\") = %x\n", plaintext, ciphertext)
 
 }