From 2b1f368c93861ef751e32574b08ee4caa5e80c7f Mon Sep 17 00:00:00 2001
From: "David I. Lehn" <dlehn@digitalbazaar.com>
Date: Mon, 7 Mar 2022 19:41:19 -0500
Subject: [PATCH] Add fallback to pretty print invalid UTF8 data.

Malformed UTF8 data can cause the escaping code to fail. Capture the
failures and print out a hex version with error note.
---
 CHANGELOG.md |  5 +++++
 lib/asn1.js  | 11 ++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 730767d0b..075ea30a7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 Forge ChangeLog
 ===============
 
+## 1.3.0 - 2022-XXX
+
+### Fixed
+- [asn1] Add fallback to pretty print invalid UTF8 data.
+
 ## 1.2.1 - 2022-01-11
 
 ### Fixed
diff --git a/lib/asn1.js b/lib/asn1.js
index e0fea0e08..c142f6358 100644
--- a/lib/asn1.js
+++ b/lib/asn1.js
@@ -1391,7 +1391,16 @@ asn1.prettyPrint = function(obj, level, indentation) {
       }
       rval += '0x' + forge.util.bytesToHex(obj.value);
     } else if(obj.type === asn1.Type.UTF8) {
-      rval += forge.util.decodeUtf8(obj.value);
+      try {
+        rval += forge.util.decodeUtf8(obj.value);
+      } catch(e) {
+        if(e.message === 'URI malformed') {
+          rval +=
+            '0x' + forge.util.bytesToHex(obj.value) + ' (malformed UTF8)';
+        } else {
+          throw e;
+        }
+      }
     } else if(obj.type === asn1.Type.PRINTABLESTRING ||
       obj.type === asn1.Type.IA5String) {
       rval += obj.value;