From 9a90fe37944ce23ecee6425a4b11f0594bb2165e Mon Sep 17 00:00:00 2001
From: neilpang <github@neilpang.com>
Date: Thu, 25 Feb 2021 07:45:22 +0800
Subject: [PATCH] fix https://github.com/acmesh-official/acme.sh/issues/3402

---
 acme.sh | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/acme.sh b/acme.sh
index 3c66250e..24cda9c4 100755
--- a/acme.sh
+++ b/acme.sh
@@ -562,8 +562,16 @@ if _exists xargs && [ "$(printf %s '\\x41' | xargs printf)" = 'A' ]; then
 fi
 
 _h2b() {
-  if _exists xxd && xxd -r -p 2>/dev/null; then
-    return
+  if _exists xxd; then
+    if _contains "$(xxd --help 2>&1)" "assumes -c30"; then
+      if xxd -r -p -c 9999 2>/dev/null; then
+        return
+      fi
+    else
+      if xxd -r -p 2>/dev/null; then
+        return
+      fi
+    fi
   fi
 
   hex=$(cat)