diff --git a/openbsc/include/openbsc/gprs_sgsn.h b/openbsc/include/openbsc/gprs_sgsn.h
index d3cd8bb..411462b 100644
--- a/openbsc/include/openbsc/gprs_sgsn.h
+++ b/openbsc/include/openbsc/gprs_sgsn.h
@@ -273,6 +273,8 @@
 
 struct sgsn_subscriber_data {
 	struct sgsn_mm_ctx	*mm;
+	struct gsm_auth_tuple	auth_triplets[5];
+	int			auth_triplets_updated;
 	int			authenticate;
 };
 
@@ -288,6 +290,8 @@
 int sgsn_auth_request(struct sgsn_mm_ctx *mm);
 enum sgsn_auth_state sgsn_auth_state(struct sgsn_mm_ctx *mm);
 void sgsn_auth_update(struct sgsn_mm_ctx *mm);
+struct gsm_auth_tuple *sgsn_auth_get_tuple(struct sgsn_mm_ctx *mmctx,
+					   unsigned key_seq);
 
 /*
  * GPRS subscriber data