gpg: Add option --assert-pubkey_algo.

* g10/keyid.c (parse_one_algo_string): New.
(compare_pubkey_string_part): New.
(compare_pubkey_string): New.
* g10/verify.c (check_assert_signer_list): New.
* g10/mainproc.c (check_sig_and_print): Call check_assert_pubkey_algo.
* g10/options.h (opt): Add field assert_pubkey_algos.
* g10/gpg.c (oAssertPubkeyAlgo): New.
(opts): Add "--assert-pubkey_algo".
(assert_pubkey_algo_false): New.
(main): Parse option.
(g10_exit): Reorder RC modifications.  Check assert_pubkey_algo_false.
* common/status.h (ASSERT_PUBKEY_ALGOS): new.
* common/t-support.h (LEAN_T_SUPPORT): Use a simplified version if
this macro is set.

* g10/gpgv.c (oAssertPubkeyAlgo): New.
(opts): Add "--assert-pubkey_algo".
(assert_pubkey_algo_false): New.
(main): Parse option.
(g10_exit): Check assert_pubkey_algo_false.

* g10/t-keyid.c: New.
* g10/Makefile.am: Add t-keyid.
* g10/test-stubs.c: Add assert_pubkey_algos and assert_signer_list and
remove from other tests.
(check_assert_signer_list): Ditto.
(check_assert_pubkey_algo): Ditto.
--

GnuPG-bug-id: 6946

g10/test.c

@@ -15,6 +15,7 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
 #include <config.h>