[nrf fromtree] Bluetooth: Mesh: fix static oob zero padding

The sample in the Provisioning protocol spec chapter
is in big endian. Static OOB value should append
zeroes on the little endian platforms.

Signed-off-by: Aleksandr Khromykh <[email protected]>
(cherry picked from commit fcfc47b)

Author: alxelax

subsys/bluetooth/mesh/prov_device.c

@@ -160,10 +160,10 @@ static void prov_start(const uint8_t *data)
 	}
 
 	if (atomic_test_bit(bt_mesh_prov_link.flags, OOB_STATIC_KEY)) {
-		memcpy(bt_mesh_prov_link.auth + 16 - bt_mesh_prov->static_val_len,
-		       bt_mesh_prov->static_val, bt_mesh_prov->static_val_len);
-		(void)memset(bt_mesh_prov_link.auth, 0,
-			     sizeof(bt_mesh_prov_link.auth) - bt_mesh_prov->static_val_len);
+		memcpy(bt_mesh_prov_link.auth, bt_mesh_prov->static_val,
+				bt_mesh_prov->static_val_len);
+		memset(bt_mesh_prov_link.auth + bt_mesh_prov->static_val_len, 0,
+				sizeof(bt_mesh_prov_link.auth) - bt_mesh_prov->static_val_len);
 	}
 }
 

subsys/bluetooth/mesh/provisioner.c

@@ -698,11 +698,9 @@ int bt_mesh_auth_method_set_static(const uint8_t *static_val, uint8_t size)
 
 	prov_set_method(AUTH_METHOD_STATIC, 0, 0);
 
-	memcpy(bt_mesh_prov_link.auth + 16 - size, static_val, size);
-	if (size < 16) {
-		(void)memset(bt_mesh_prov_link.auth, 0,
-			     sizeof(bt_mesh_prov_link.auth) - size);
-	}
+	memcpy(bt_mesh_prov_link.auth, static_val, size);
+	memset(bt_mesh_prov_link.auth + size, 0, sizeof(bt_mesh_prov_link.auth) - size);
+
 	return 0;
 }