diff --git a/hash/hash.go b/hash/hash.go
index 953a426..cf5b00d 100644
--- a/hash/hash.go
+++ b/hash/hash.go
@@ -13,10 +13,13 @@ import (
 
 	"github.com/cespare/xxhash/v2"
 	"github.com/charlienet/go-mixed/bytesconv"
+	"github.com/charlienet/go-mixed/crypto"
 	"github.com/spaolacci/murmur3"
 	"github.com/tjfoc/gmsm/sm3"
 )
 
+var _ crypto.Signer = &hashComparer{}
+
 type HashFunc func([]byte) bytesconv.BytesResult
 
 var hashFuncs = map[string]HashFunc{
@@ -44,6 +47,11 @@ func New(fname string) (*hashComparer, error) {
 	}, nil
 }
 
+func (c *hashComparer) Sign(msg []byte) ([]byte, error) {
+	ret := c.hashFunc(msg)
+	return ret.Bytes(), nil
+}
+
 func (c *hashComparer) Verify(msg, target []byte) bool {
 	ret := c.hashFunc(msg)
 	ret.Bytes()
diff --git a/hmac/hmac.go b/hmac/hmac.go
index 2d677a2..c9eae3d 100644
--- a/hmac/hmac.go
+++ b/hmac/hmac.go
@@ -12,9 +12,12 @@ import (
 	"strings"
 
 	"github.com/charlienet/go-mixed/bytesconv"
+	"github.com/charlienet/go-mixed/crypto"
 	"github.com/tjfoc/gmsm/sm3"
 )
 
+var _ crypto.Signer = &hashComparer{}
+
 type HMacFunc func(key, msg []byte) bytesconv.BytesResult
 
 var hmacFuncs = map[string]HMacFunc{
@@ -44,6 +47,11 @@ func New(fname string, key []byte) (*hashComparer, error) {
 	}, nil
 }
 
+func (c *hashComparer) Sign(msg []byte) ([]byte, error) {
+	ret := c.hashFunc(c.key, msg)
+	return ret.Bytes(), nil
+}
+
 func (c *hashComparer) Verify(msg, target []byte) bool {
 	ret := c.hashFunc(c.key, msg)