From 1a88fd806689cae8eff4aa61c98777c57467c131 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C3=A9vin=20Redon?= <kredon@sysmocom.de>
Date: Wed, 15 May 2019 00:23:21 +0200
Subject: [PATCH] use simplest ATR

this is the shortest and simplest ATR possible according to the
ISO 7816-3 spec.
it does not offer any non-default parameters (F, D, WI, ...)

Change-Id: I4ff41b5120bcadca652296f9d3691f7606be2bd2
---
 firmware/libcommon/source/card_emu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/firmware/libcommon/source/card_emu.c b/firmware/libcommon/source/card_emu.c
index b7d0e1f6..ab154b4d 100644
--- a/firmware/libcommon/source/card_emu.c
+++ b/firmware/libcommon/source/card_emu.c
@@ -1121,8 +1121,8 @@ void tc_etu_wtime_expired(void *handle)
 	}
 }
 
-/* shortest ATR found in smartcard_list.txt */
-static const uint8_t default_atr[] = { 0x3B, 0x02, 0x14, 0x50 };
+/* shortest ATR possible (uses default speed and no options) */
+static const uint8_t default_atr[] = { 0x3B, 0x00 };
 
 static struct card_handle card_handles[NUM_SLOTS];