From 4181c2d66c1cca197b40100c57d6770ada46bea2 Mon Sep 17 00:00:00 2001
From: Heiko Schaefer <heiko@schaefer.name>
Date: Mon, 17 Oct 2022 15:15:11 +0200
Subject: [PATCH] Clean up error handing for unexpected length of 'Digital
 signature counter' DO

---
 openpgp-card/src/openpgp.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/openpgp-card/src/openpgp.rs b/openpgp-card/src/openpgp.rs
index d3026be..c69374f 100644
--- a/openpgp-card/src/openpgp.rs
+++ b/openpgp-card/src/openpgp.rs
@@ -128,7 +128,12 @@ impl<'a> OpenPgpTransaction<'a> {
 
         if let Value::S(data) = res {
             let mut data = data.to_vec();
-            assert_eq!(data.len(), 3);
+            if data.len() != 3 {
+                return Err(Error::ParseError(format!(
+                    "Unexpected length {} for 'Digital signature counter' DO",
+                    data.len()
+                )));
+            }
 
             data.insert(0, 0); // prepend a zero
             let data: [u8; 4] = data.try_into().unwrap();