From bb09604f2e73f17922cd5354c35d9dd28f1a6001 Mon Sep 17 00:00:00 2001
From: Matthias Ringwald <matthias@ringwald.ch>
Date: Fri, 30 Mar 2018 22:22:19 +0200
Subject: [PATCH] sm: request signing key only when bonding and
 ENABLE_LE_SIGNED_WRITE

---
 src/ble/sm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ble/sm.c b/src/ble/sm.c
index 38c23cb18..50c069514 100644
--- a/src/ble/sm.c
+++ b/src/ble/sm.c
@@ -1146,10 +1146,14 @@ static void sm_done_for_handle(hci_con_handle_t con_handle){
 }
 
 static int sm_key_distribution_flags_for_auth_req(void){
-    int flags = SM_KEYDIST_ID_KEY | SM_KEYDIST_SIGN;
+
+    int flags = SM_KEYDIST_ID_KEY;
     if (sm_auth_req & SM_AUTHREQ_BONDING){
-        // encryption information only if bonding requested
+        // encryption and signing information only if bonding requested
         flags |= SM_KEYDIST_ENC_KEY;
+#ifdef ENABLE_LE_SIGNED_WRITE
+        flags | = SM_KEYDIST_SIGN;
+#endif
     }
     return flags;
 }