diff --git a/interfaces/innerkits/key/pub_key.h b/interfaces/innerkits/key/pub_key.h
index 3ed35f2ac833714ab6037f8d6509de60d4ac4b37..75c116558d686356f50545d1d07886e76d587f80 100644
--- a/interfaces/innerkits/key/pub_key.h
+++ b/interfaces/innerkits/key/pub_key.h
@@ -30,6 +30,8 @@ struct HcfPubKey {
     HcfResult (*getAsyKeySpecString)(const HcfPubKey *self, const AsyKeySpecItem item, char **returnString);
 
     HcfResult (*getAsyKeySpecInt)(const HcfPubKey *self, const AsyKeySpecItem item, int *returnInt);
+
+    HcfResult (*getEncodedDer)(const HcfPubKey *self, const char *format, HcfBlob *returnBlob);
 };
 
 #endif