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/* run-decrypt.c - Helper to perform a verify operation
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Copyright (C) 2009 g10 Code GmbH
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2016 by Bundesamt für Sicherheit in der Informationstechnik
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Software engineering by Intevation GmbH
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This file is part of GPGME.
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GPGME is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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GPGME is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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/* We need to include config.h so that we know whether we are building
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with large file system (LFS) support. */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <gpgme.h>
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#define PGM "run-decrypt"
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#include "run-support.h"
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static int verbose;
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static gpg_error_t
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status_cb (void *opaque, const char *keyword, const char *value)
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{
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(void)opaque;
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fprintf (stderr, "status_cb: %s %s\n", keyword, value);
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return 0;
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}
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static void
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print_result (gpgme_decrypt_result_t result)
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{
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gpgme_recipient_t recp;
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int count = 0;
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printf ("Original file name: %s\n", nonnull(result->file_name));
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printf ("Wrong key usage: %i\n", result->wrong_key_usage);
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printf ("Unsupported algorithm: %s\n",
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nonnull(result->unsupported_algorithm));
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if (result->session_key)
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printf ("Session key: %s\n", result->session_key);
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for (recp = result->recipients; recp->next; recp = recp->next)
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{
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printf ("recipient %d\n", count++);
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printf (" status ....: %s\n", gpgme_strerror (recp->status));
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printf (" keyid: %s\n", nonnull (recp->keyid));
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printf (" algo ...: %s\n", gpgme_pubkey_algo_name (recp->pubkey_algo));
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}
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}
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static int
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show_usage (int ex)
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{
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fputs ("usage: " PGM " [options] FILE\n\n"
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"Options:\n"
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" --verbose run in verbose mode\n"
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" --status print status lines from the backend\n"
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" --openpgp use the OpenPGP protocol (default)\n"
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" --cms use the CMS protocol\n"
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" --export-session-key show the session key\n"
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" --override-session-key STRING use STRING as session key\n"
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" --unwrap remove only the encryption layer\n"
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, stderr);
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exit (ex);
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}
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int
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main (int argc, char **argv)
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{
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int last_argc = -1;
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gpgme_error_t err;
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gpgme_ctx_t ctx;
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gpgme_protocol_t protocol = GPGME_PROTOCOL_OpenPGP;
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gpgme_decrypt_flags_t flags = 0;
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FILE *fp_in = NULL;
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gpgme_data_t in = NULL;
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gpgme_data_t out = NULL;
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gpgme_decrypt_result_t result;
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int print_status = 0;
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int export_session_key = 0;
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const char *override_session_key = NULL;
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int raw_output = 0;
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if (argc)
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{ argc--; argv++; }
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while (argc && last_argc != argc )
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{
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last_argc = argc;
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if (!strcmp (*argv, "--"))
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{
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argc--; argv++;
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break;
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}
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else if (!strcmp (*argv, "--help"))
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show_usage (0);
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else if (!strcmp (*argv, "--verbose"))
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{
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verbose = 1;
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argc--; argv++;
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}
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else if (!strcmp (*argv, "--status"))
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{
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print_status = 1;
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argc--; argv++;
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}
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else if (!strcmp (*argv, "--openpgp"))
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{
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protocol = GPGME_PROTOCOL_OpenPGP;
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argc--; argv++;
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}
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else if (!strcmp (*argv, "--cms"))
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{
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protocol = GPGME_PROTOCOL_CMS;
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argc--; argv++;
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}
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else if (!strcmp (*argv, "--export-session-key"))
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{
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export_session_key = 1;
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argc--; argv++;
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}
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else if (!strcmp (*argv, "--override-session-key"))
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{
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argc--; argv++;
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if (!argc)
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show_usage (1);
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override_session_key = *argv;
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argc--; argv++;
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}
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else if (!strcmp (*argv, "--unwrap"))
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{
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flags |= GPGME_DECRYPT_UNWRAP;
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raw_output = 1;
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argc--; argv++;
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}
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else if (!strncmp (*argv, "--", 2))
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show_usage (1);
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}
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if (argc < 1 || argc > 2)
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show_usage (1);
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fp_in = fopen (argv[0], "rb");
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if (!fp_in)
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{
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err = gpgme_error_from_syserror ();
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fprintf (stderr, PGM ": can't open `%s': %s\n",
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argv[0], gpgme_strerror (err));
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exit (1);
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}
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init_gpgme (protocol);
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err = gpgme_new (&ctx;;
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fail_if_err (err);
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gpgme_set_protocol (ctx, protocol);
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if (print_status)
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{
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gpgme_set_status_cb (ctx, status_cb, NULL);
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gpgme_set_ctx_flag (ctx, "full-status", "1");
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}
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if (export_session_key)
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{
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err = gpgme_set_ctx_flag (ctx, "export-session-key", "1");
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if (err)
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{
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fprintf (stderr, PGM ": error requesting exported session key: %s\n",
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gpgme_strerror (err));
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exit (1);
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}
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}
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if (override_session_key)
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{
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err = gpgme_set_ctx_flag (ctx, "override-session-key",
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override_session_key);
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if (err)
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{
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fprintf (stderr, PGM ": error overriding session key: %s\n",
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gpgme_strerror (err));
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exit (1);
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}
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}
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err = gpgme_data_new_from_stream (&in, fp_in);
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if (err)
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{
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fprintf (stderr, PGM ": error allocating data object: %s\n",
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gpgme_strerror (err));
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exit (1);
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}
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err = gpgme_data_new (&out;;
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if (err)
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{
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fprintf (stderr, PGM ": error allocating data object: %s\n",
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gpgme_strerror (err));
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exit (1);
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}
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err = gpgme_op_decrypt_ext (ctx, flags, in, out);
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result = gpgme_op_decrypt_result (ctx);
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if (err)
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{
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fprintf (stderr, PGM ": decrypt failed: %s\n", gpgme_strerror (err));
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exit (1);
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}
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if (result)
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{
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if (!raw_output)
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print_result (result);
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if (!raw_output)
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fputs ("Begin Output:\n", stdout);
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print_data (out);
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if (!raw_output)
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fputs ("End Output.\n", stdout);
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}
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gpgme_data_release (out);
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gpgme_data_release (in);
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gpgme_release (ctx);
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return 0;
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}
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