diff --git a/src/main/java/racal/sunyard/main/SydApi4j.java b/src/main/java/racal/sunyard/main/SydApi4j.java
index b9eef27..1543fce 100644
--- a/src/main/java/racal/sunyard/main/SydApi4j.java
+++ b/src/main/java/racal/sunyard/main/SydApi4j.java
@@ -4954,6 +4954,11 @@ public class SydApi4j implements SydApi {
     }
 
 
+    @Override
+    public byte[] SM3Hash(String publicKey, String userId, byte[] msg){
+        return SM3Hash(publicKey, null, null, userId, msg);
+    }
+
     @Override
     public byte[] SM3Hash(String publicKey, byte[] msg, int block, byte[] mac) {