Bluetooth: Classic: SMP: Set secure connection for derived LTK

lylezhu2012 · kartben · commit b59bc363eaef · 2025-03-31T11:29:49.000+02:00
If the encrypt value of classic connection is
`BT_HCI_ENCRYPTION_ON_BR_AES_CCM`, set the flag `BT_KEYS_SC` for
the derived LTK.

Or, clear the flag `BT_KEYS_SC` for the derived LTK.

Signed-off-by: Lyle Zhu &lt;lyle.zhu@nxp.com&gt;
diff --git a/subsys/bluetooth/host/smp.c b/subsys/bluetooth/host/smp.c
@@ -1048,6 +1048,12 @@ static void smp_br_derive_ltk(struct bt_smp_br *smp)
 		keys->flags &= ~BT_KEYS_AUTHENTICATED;
 	}
 
+	if (conn->encrypt == BT_HCI_ENCRYPTION_ON_BR_AES_CCM) {
+		keys->flags |= BT_KEYS_SC;
+	} else {
+		keys->flags &= ~BT_KEYS_SC;
+	}
+
 	LOG_DBG("LTK derived from LinkKey");
 }
 

Original file line number	Diff line number	Diff line change
`@@ -1048,6 +1048,12 @@ static void smp_br_derive_ltk(struct bt_smp_br *smp)`
`1048`	`1048`	`keys->flags &= ~BT_KEYS_AUTHENTICATED;`
`1049`	`1049`	`}`
`1050`	`1050`
	`1051`	`+ if (conn->encrypt == BT_HCI_ENCRYPTION_ON_BR_AES_CCM) {`
	`1052`	`+ keys->flags \|= BT_KEYS_SC;`
	`1053`	`+ } else {`
	`1054`	`+ keys->flags &= ~BT_KEYS_SC;`
	`1055`	`+ }`
	`1056`	`+`
`1051`	`1057`	`LOG_DBG("LTK derived from LinkKey");`
`1052`	`1058`	`}`
`1053`	`1059`