From b2c2980d73d89100364f8dbc447752cca5e2615e Mon Sep 17 00:00:00 2001
From: Pol Henarejos <pol.henarejos@cttc.es>
Date: Sun, 30 Oct 2022 21:10:15 +0100
Subject: [PATCH] Fix secure channel with no payload.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
---
 src/eac.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/eac.c b/src/eac.c
index 322e815..c0565e1 100644
--- a/src/eac.c
+++ b/src/eac.c
@@ -106,8 +106,10 @@ int sm_unwrap() {
             }
         }
     }
-    if (!body)
-        return CCID_WRONG_DATA;
+    if (!body) {
+        apdu.nc = 0;
+        return CCID_OK;
+    }
     if (is87 && *body++ != 0x1) {
         return CCID_WRONG_PADDING;
     }