From 9d6a2a60c2c3828b20c5b2114ee644515db30cf8 Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Wed, 1 Apr 2009 14:38:22 +0000
Subject: [PATCH] Prepare for OpenPGP cards with extended length support.

---
 scd/ChangeLog     |  5 +++++
 scd/app-openpgp.c | 12 ++++++++----
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/scd/ChangeLog b/scd/ChangeLog
index 534a7092b..d54355de5 100644
--- a/scd/ChangeLog
+++ b/scd/ChangeLog
@@ -1,3 +1,8 @@
+2009-04-01  Werner Koch  <wk@g10code.com>
+
+	* app-openpgp.c (do_setattr, do_writekey): Prepare for extended
+	length cards.
+
 2009-03-31  Werner Koch  <wk@g10code.com>
 
 	* command.c (percent_plus_unescape): Remove.
diff --git a/scd/app-openpgp.c b/scd/app-openpgp.c
index 2c89e8c3c..6f48cb8ce 100644
--- a/scd/app-openpgp.c
+++ b/scd/app-openpgp.c
@@ -1772,9 +1772,11 @@ do_setattr (app_t app, const char *name,
      will reread the data from the card and thus get synced in case of
      errors (e.g. data truncated by the card). */
   flush_cache_item (app, table[idx].tag);
-  /* For command chaining we use a value of 254 for this card.  */
-  if (app->app_local->cardcap.cmd_chaining && valuelen > 254)
-    exmode = -254;
+
+  if (app->app_local->cardcap.ext_lc_le && valuelen > 254)
+    exmode = 1;    /* Use extended length w/o a limit.  */
+  else if (app->app_local->cardcap.cmd_chaining && valuelen > 254)
+    exmode = -254; /* Command chaining with max. 254 bytes.  */
   else
     exmode = 0;
   rc = iso7816_put_data (app->slot, exmode, table[idx].tag, value, valuelen);
@@ -2432,7 +2434,9 @@ do_writekey (app_t app, ctrl_t ctrl,
         goto leave;
 
       /* Store the key. */
-      if (app->app_local->cardcap.cmd_chaining && template_len > 254)
+      if (app->app_local->cardcap.ext_lc_le && template_len > 254)
+        exmode = 1;    /* Use extended length w/o a limit.  */
+      else if (app->app_local->cardcap.cmd_chaining && template_len > 254)
         exmode = -254;
       else
         exmode = 0;