From 2c186200758a85b9dd8ea86f933c4fa44b058214 Mon Sep 17 00:00:00 2001
From: Thomas Waldmann <tw@waldmann-edv.de>
Date: Fri, 20 Sep 2024 20:19:30 +0200
Subject: [PATCH] fix WORKAROUNDS=authenticated_no_key support for archive TAM
 authentication, fixes #8400

---
 src/borg/crypto/key.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/borg/crypto/key.py b/src/borg/crypto/key.py
index 0a634ba23b..25cff0a8cd 100644
--- a/src/borg/crypto/key.py
+++ b/src/borg/crypto/key.py
@@ -305,6 +305,8 @@ def unpack_and_verify_archive(self, data, force_tam_not_required=False):
         unpacker = get_limited_unpacker('archive')
         unpacker.feed(data)
         unpacked = unpacker.unpack()
+        if AUTHENTICATED_NO_KEY:
+            return unpacked, True, None  # True is a lie.
         if b'tam' not in unpacked:
             if tam_required:
                 archive_name = unpacked.get(b'name', b'<unknown>').decode('ascii', 'replace')