From a197ba1a99271525424b53e507e0afe5eb41473d Mon Sep 17 00:00:00 2001
From: Peter Popovec <popovec@fei.tuke.sk>
Date: Mon, 3 Jul 2017 13:19:42 +0200
Subject: [PATCH] MyEID - T0 protocol fail for derive operation

apdu.le  must be set minimally to shared key length (pubkey_len / 2),
otherwise sc_get_response() does not read derived shared key from card.
---
 src/libopensc/card-myeid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libopensc/card-myeid.c b/src/libopensc/card-myeid.c
index 80c2821a..1b053a03 100644
--- a/src/libopensc/card-myeid.c
+++ b/src/libopensc/card-myeid.c
@@ -1005,7 +1005,7 @@ int myeid_ecdh_derive(struct sc_card *card, const u8* pubkey, size_t pubkey_len,
 	memcpy(&sbuf[4 + ext_len_bytes], pubkey, pubkey_len);
 
 	apdu.lc = pubkey_len + 4 + ext_len_bytes;
-	apdu.le = 0;
+	apdu.le = pubkey_len / 2;
 	apdu.datalen = apdu.lc;
 	apdu.data = sbuf;