diff --git a/internal/pkg/cmb/sm.go b/internal/pkg/cmb/sm.go
new file mode 100644
index 0000000..97cdece
--- /dev/null
+++ b/internal/pkg/cmb/sm.go
@@ -0,0 +1,19 @@
+package cmb
+
+import (
+	sm22 "voucher/internal/pkg/cmb/sm2"
+)
+
+type Smx struct {
+	Sm *sm22.Sm2
+}
+
+func NewSmx(privateKey, publicKey string) (*Smx, error) {
+	return &Smx{
+		Sm: sm22.NewSm2().SetHexPrivateKey(privateKey).SetHexPublicKey(publicKey),
+	}, nil
+}
+
+func (s *Smx) Sign(input string) {
+
+}