tests: Add symmetric decryption tests.

* tests/openpgp/decrypt-sym.scm: New.
* tests/openpgp/samplemsgs/enc-sym-cfb-1.asc: New.
* tests/openpgp/samplemsgs/enc-sym-cfb-2.asc: New.
* tests/openpgp/samplemsgs/enc-sym-ocb-1.asc: New.
* tests/openpgp/samplemsgs/enc-sym-ocb-2.asc: New.
--

It's time to have some OCB tests in our suite so that we don't forget
to run the tests from our RNP interop tests.  Also adds new tests for
CFB messages.

tests/openpgp/Makefile.am

@@ -47,6 +47,7 @@ XTESTS = \
 	enarmor.scm \
 	mds.scm \
 	decrypt.scm \
+	decrypt-sym.scm \
 	decrypt-multifile.scm \
 	decrypt-dsa.scm \
 	decrypt-session-key.scm \
@@ -240,6 +241,10 @@ sample_keys = samplekeys/README \
 sample_msgs = samplemsgs/clearsig-1-key-1.asc \
 	      samplemsgs/clearsig-2-keys-1.asc \
 	      samplemsgs/clearsig-2-keys-2.asc \
+	      samplemsgs/enc-sym-cfb-1.asc \
+	      samplemsgs/enc-sym-cfb-1.asc \
+	      samplemsgs/enc-sym-ocb-1.asc \
+	      samplemsgs/enc-sym-ocb-1.asc \
 	      samplemsgs/enc-1-key-1.asc \
 	      samplemsgs/enc-1-key-2.asc \
 	      samplemsgs/enc-2-keys-1.asc \

tests/openpgp/decrypt-sym.scm

@@ -0,0 +1,38 @@
+#!/usr/bin/env gpgscm
+
+;; Copyright (C) 2022 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 (in-srcdir "tests" "openpgp" "defs.scm"))
+(setup-legacy-environment)
+
+(define passphrase "password")
+(define plaintext "Hello, world!\n")
+
+
+(for-each-p
+ "Checking decryption of symmetric encrypted files"
+ (lambda (name)
+   (tr:do
+    (tr:open (in-srcdir "tests" "openpgp" "samplemsgs"
+                        (string-append name ".asc")))
+    (tr:gpg passphrase '(--passphrase-fd "0" --yes --decrypt))
+    (tr:assert-same plaintext)))
+ '("enc-sym-cfb-1"
+   "enc-sym-cfb-2"
+   "enc-sym-ocb-1"
+   "enc-sym-ocb-2"))

tests/openpgp/samplemsgs/enc-sym-cfb-1.asc

@@ -0,0 +1,9 @@
+Symmetric encrypted message of "Hello, world!\n" using
+the passphrase "password" and cipher AES128.CFB.
+
+-----BEGIN PGP MESSAGE-----
+
+jA0EBwMCt0tGQ7H0b2Xt0j8BHVEh+mzI3SyApdQmObZuDtAKNk/dRbERyF7haRCn
+cw3N5t3hbOZ/fWlN/BRAaKplninV//QEo8lqheFFpmI=
+=LxrG
+-----END PGP MESSAGE-----

tests/openpgp/samplemsgs/enc-sym-cfb-2.asc

@@ -0,0 +1,9 @@
+Symmetric encrypted message of "Hello, world!\n" using
+the passphrase "password" and cipher AES256.CFB.
+
+-----BEGIN PGP MESSAGE-----
+
+jA0ECQMCN4BmCgZpVHDt0j8B1MRJ3ezrbVqU3Xofj5ykOmb7dgYytxzk6QHqzdNO
+lorumncKV+xjFkte8uKqaGJoPhoKb2s9uJWDgugLMDM=
+=gy0I
+-----END PGP MESSAGE-----

tests/openpgp/samplemsgs/enc-sym-ocb-1.asc

@@ -0,0 +1,11 @@
+Symmetric encrypted message of "Hello, world!\n" using
+the passphrase "password" and cipher AES128.OCB.
+This is the sample message from the rfc4880bis specs.
+
+-----BEGIN PGP MESSAGE-----
+
+wz0FBwIDCJ8LfaPl6mR3kJnjJuVACpCTbO+06OugjGdzcW0fJxRUCjj8rFKZSdrF
+KdPeMeFbSutynjMAM9vt1EkBBwIOXtK8HkcKvo8dZEx6bIpWew93ARlmEaFUupwl
+dM0FYoSo72gDXGI9k8xwikMhG7bq8rJ/fBjVcbzYOyCt06CLc68VuaCY
+=xyh5
+-----END PGP MESSAGE-----

tests/openpgp/samplemsgs/enc-sym-ocb-2.asc

@@ -0,0 +1,11 @@
+Symmetric encrypted message of "Hello, world!\n" using
+the passphrase "password" and cipher AES256.OCB.
+
+-----BEGIN PGP MESSAGE-----
+
+jE0FCQIDAvYE/YfWbrWF7T3TKFmFzU/o5JSmot/OwIoDZc4sABYLMuTjVeCXUaRp
+unDEDnkCz0tsov+7ljb/tu2NUDGnybSsupE+E4bMf9RJAQkCEMhe3HeHBrv1jHsS
+gbmxjSQ/r1whc40/vh6ACbp/Yu2Te1Gf/mPxS9mgLDbIeah3G9/kXlheO4X2Hhuy
+iOCOZdpPiAp1QA==
+=U8eG
+-----END PGP MESSAGE-----