From 273b8ec1931d3aeef530e9262b2447e94d4b350a Mon Sep 17 00:00:00 2001
From: NIIBE Yutaka <gniibe@fsij.org>
Date: Fri, 10 Jun 2022 11:45:26 +0900
Subject: [PATCH] scd,openpgp: Support READCERT by keygrip.

* scd/app-openpgp.c (do_readcert): Allow use of keygrip.

--

GnuPG-bug-id: 6002
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
---
 scd/app-openpgp.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/scd/app-openpgp.c b/scd/app-openpgp.c
index 3affda583..8bb346a86 100644
--- a/scd/app-openpgp.c
+++ b/scd/app-openpgp.c
@@ -2266,7 +2266,28 @@ do_readcert (app_t app, const char *certid,
 
   *cert = NULL;
   *certlen = 0;
-  if (!ascii_strcasecmp (certid, "OPENPGP.3"))
+  if (strlen (certid) == 40)
+    {
+      int keyno;
+      const unsigned char *keygrip_str;
+
+      for (keyno = 0; keyno < 3; keyno++)
+        {
+          keygrip_str = app->app_local->pk[keyno].keygrip_str;
+          if (!strncmp (keygrip_str, certid, 40))
+            break;
+        }
+
+      if (keyno == 2)
+        ;
+      else if (keyno == 1)
+        occurrence = 1;
+      else if (keyno == 0)
+        occurrence = 2;
+      else
+        return gpg_error (GPG_ERR_INV_ID);
+    }
+  else if (!ascii_strcasecmp (certid, "OPENPGP.3"))
     ;
   else if (!ascii_strcasecmp (certid, "OPENPGP.2"))
     occurrence = 1;