diff --git a/session/common.go b/session/common.go
index dda2996..9a83327 100644
--- a/session/common.go
+++ b/session/common.go
@@ -74,6 +74,10 @@ func make_storagekey(acc primitive.ObjectID) storagekey {
 	return storagekey(acc.Hex() + hex.EncodeToString(bs[2:]))
 }
 
+func AccountToSessionKey(acc primitive.ObjectID) string {
+	return string(make_storagekey(acc))
+}
+
 func storagekey_to_publickey(sk storagekey) publickey {
 	bs, _ := hex.DecodeString(string(sk))