From 4ca017e43bb296b937c792c28cd500baa1f8dc14 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Tue, 9 Jan 2024 17:25:34 +0100
Subject: [PATCH] gpg: Print a useful error id SKI algo 253 is found.

* g10/parse-packet.c (parse_key): Detect the SKI algo 253.
--

As long as we have not yet implemented this we should at least be
able to detect this case.
---
 g10/parse-packet.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/g10/parse-packet.c b/g10/parse-packet.c
index a033732ec..aa6bac9da 100644
--- a/g10/parse-packet.c
+++ b/g10/parse-packet.c
@@ -2684,7 +2684,16 @@ parse_key (IOBUF inp, int pkttype, unsigned long pktlen,
 	{
 	  ski->is_protected = 1;
 	  ski->s2k.count = 0;
-	  if (ski->algo == 254 || ski->algo == 255)
+	  if (ski->algo == 253)
+	    {
+              if (list_mode)
+                es_fprintf (listfp,
+                            "\tS2K pseudo algo %d is not yet supported\n",
+                            ski->algo);
+              err = gpg_error (GPG_ERR_NOT_IMPLEMENTED);
+              goto leave;
+            }
+          else if (ski->algo == 254 || ski->algo == 255)
 	    {
               if (pktlen < 3)
 		{