tests: New test for --{show,override}-session-key.

* tests/openpgp/Makefile.am (XTESTS): Add new test.
* tests/openpgp/decrypt-session-key.scm: New file.

Signed-off-by: Justus Winter <justus@g10code.com>

tests/openpgp/Makefile.am

@@ -50,6 +50,7 @@ XTESTS = \
 	decrypt.scm \
 	decrypt-multifile.scm \
 	decrypt-dsa.scm \
+	decrypt-session-key.scm \
 	sigs.scm \
 	sigs-dsa.scm \
 	encrypt.scm \

tests/openpgp/decrypt-session-key.scm

@@ -0,0 +1,45 @@
+#!/usr/bin/env gpgscm
+
+;; Copyright (C) 2017 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-legacy-environment)
+
+(define (get-session-key filename)
+  (lettmp (sink)
+    (let* ((status' (call-popen `(,@gpg --status-fd=1 --decrypt
+					--show-session-key
+					--output ,sink ,filename) ""))
+	   (status (map (lambda (l)
+			  (assert (string-prefix? l "[GNUPG:] "))
+			  (string-splitp (substring l 9 (string-length l))
+					 char-whitespace? -1))
+			(string-split-newlines status'))))
+      (cadr (assoc "SESSION_KEY" status)))))
+
+(for-each-p
+ "Checking decryption of supplied files using the session key."
+ (lambda (name)
+   (let* ((source (in-srcdir (string-append name ".asc")))
+	  (key (get-session-key source)))
+     (with-ephemeral-home-directory
+      (tr:do
+       (tr:open source)
+       (tr:gpg "" `(--yes --decrypt --override-session-key ,key))
+       (tr:assert-identity name)))))
+ plain-files)