tests: Add test for the ssh key export.

* tests/openpgp/Makefile.am (XTESTS): Add new test.
(sample_keys): Add new files.
* tests/openpgp/samplekeys/authenticate-only.pub.asc: New file.
* tests/openpgp/samplekeys/authenticate-only.sec.asc: Likewise.
* tests/openpgp/ssh-export.scm: Likewise.

GnuPG-bug-id: 2848
Signed-off-by: Justus Winter <justus@g10code.com>

tests/openpgp/ssh-export.scm

@@ -0,0 +1,52 @@
+#!/usr/bin/env gpgscm
+
+;; Copyright (C) 2016 g10 Code GmbH
+;;
+;; This file is part of GnuPG.
+;;
+;; GnuPG is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; GnuPG is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program; if not, see <http://www.gnu.org/licenses/>.
+
+(load (with-path "defs.scm"))
+(setup-environment)
+
+(define key
+  `(,(in-srcdir "samplekeys" "authenticate-only.sec.asc")
+    "927EF377FD1A1B6F795E40C02A87917D8FFBA49F"
+    "72360FDB6380212D5DAF2FA9E51185A9253C496D"
+    "ssh-rsa"))
+
+(define :file car)
+(define :fpr cadr)
+(define :subkey-fpr caddr)
+(define :kind cadddr)
+
+;; Return true if a-str and b-str share a suffix of length n.
+(define (string-common-suffix? n a-str b-str)
+  (let ((a-len (string-length a-str))
+	(b-len (string-length b-str)))
+  (if (> n (min a-len b-len))
+      #f
+      (string=? (substring a-str (- a-len n) a-len)
+		(substring b-str (- b-len n) b-len)))))
+
+(info "Checking ssh export...")
+(call-check `(,@GPG --yes --import ,(:file key)))
+
+(let* ((result (call-check `(,@GPG --export-ssh-key ,(:fpr key))))
+       ;; XXX: We should split at any whitespace here.
+       (parts (string-split (string-trim char-whitespace? result) #\space)))
+  (assert (string=? (car parts) (:kind key)))
+  ;; XXX: We should not use a short keyid as the comment when
+  ;; exporting an ssh key.
+  (assert (string-common-suffix? 8 (caddr parts) (:subkey-fpr key))))