gnupg.patch

diff --git a/agent/call-scd.c b/agent/call-scd.c
index 91e28e68c..59c460e5d 100644
--- a/agent/call-scd.c
+++ b/agent/call-scd.c
@@ -494,15 +494,19 @@ agent_card_pksign (ctrl_t ctrl,
   if (!mdalgo)
     return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
 
-  if (indatalen*2 + 50 > DIM(line))
-    return unlock_scd (ctrl, gpg_error (GPG_ERR_GENERAL));
-
-  bin2hex (indata, indatalen, stpcpy (line, "SETDATA "));
-
-  rc = assuan_transact (daemon_ctx (ctrl), line,
-                        NULL, NULL, NULL, NULL, pincache_put_cb, NULL);
-  if (rc)
-    return unlock_scd (ctrl, rc);
+  const int MAX_BYTES_PER_LINE = 475;
+  for (const unsigned char *cur = indata, *end = indata + indatalen; cur < end; cur += MAX_BYTES_PER_LINE) {
+    size_t chunklen = ((end - cur) > MAX_BYTES_PER_LINE) ? MAX_BYTES_PER_LINE : (end - cur);
+    if (cur == indata) {
+      bin2hex (cur, chunklen, stpcpy (line, "SETDATA "));
+    } else {
+      bin2hex (cur, chunklen, stpcpy (line, "SETDATA --append "));
+    }
+    rc = assuan_transact (daemon_ctx (ctrl), line,
+                          NULL, NULL, NULL, NULL, pincache_put_cb, NULL);
+    if (rc)
+      return unlock_scd (ctrl, rc);
+  }
 
   init_membuf (&data, 1024);
   inqparm.ctx = daemon_ctx (ctrl);