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/* run-decrypt.c - Helper to perform a verify operation
Copyright (C) 2009 g10 Code GmbH
2016 Intevation GmbH
This file is part of GPGME.
GPGME is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of
the License, or (at your option) any later version.
GPGME 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, see <https://www.gnu.org/licenses/>.
*/
/* We need to include config.h so that we know whether we are building
with large file system (LFS) support. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gpgme.h>
#define PGM "run-decrypt"
#include "run-support.h"
static int verbose;
static gpg_error_t
status_cb (void *opaque, const char *keyword, const char *value)
{
(void)opaque;
fprintf (stderr, "status_cb: %s %s\n", keyword, value);
return 0;
}
static void
print_result (gpgme_decrypt_result_t result)
{
gpgme_recipient_t recp;
int count = 0;
printf ("Original file name: %s\n", nonnull(result->file_name));
printf ("Wrong key usage: %i\n", result->wrong_key_usage);
printf ("Unsupported algorithm: %s\n",
nonnull(result->unsupported_algorithm));
if (result->session_key)
printf ("Session key: %s\n", result->session_key);
for (recp = result->recipients; recp->next; recp = recp->next)
{
printf ("recipient %d\n", count++);
printf (" status ....: %s\n", gpgme_strerror (recp->status));
printf (" keyid: %s\n", nonnull (recp->keyid));
printf (" algo ...: %s\n", gpgme_pubkey_algo_name (recp->pubkey_algo));
}
}
static int
show_usage (int ex)
{
fputs ("usage: " PGM " [options] FILE\n\n"
"Options:\n"
" --verbose run in verbose mode\n"
" --status print status lines from the backend\n"
" --openpgp use the OpenPGP protocol (default)\n"
" --cms use the CMS protocol\n"
" --export-session-key show the session key\n"
" --override-session-key STRING use STRING as session key\n"
, stderr);
exit (ex);
}
int
main (int argc, char **argv)
{
int last_argc = -1;
gpgme_error_t err;
gpgme_ctx_t ctx;
gpgme_protocol_t protocol = GPGME_PROTOCOL_OpenPGP;
FILE *fp_in = NULL;
gpgme_data_t in = NULL;
gpgme_data_t out = NULL;
gpgme_decrypt_result_t result;
int print_status = 0;
int export_session_key = 0;
const char *override_session_key = NULL;
if (argc)
{ argc--; argv++; }
while (argc && last_argc != argc )
{
last_argc = argc;
if (!strcmp (*argv, "--"))
{
argc--; argv++;
break;
}
else if (!strcmp (*argv, "--help"))
show_usage (0);
else if (!strcmp (*argv, "--verbose"))
{
verbose = 1;
argc--; argv++;
}
else if (!strcmp (*argv, "--status"))
{
print_status = 1;
argc--; argv++;
}
else if (!strcmp (*argv, "--openpgp"))
{
protocol = GPGME_PROTOCOL_OpenPGP;
argc--; argv++;
}
else if (!strcmp (*argv, "--cms"))
{
protocol = GPGME_PROTOCOL_CMS;
argc--; argv++;
}
else if (!strcmp (*argv, "--export-session-key"))
{
export_session_key = 1;
argc--; argv++;
}
else if (!strcmp (*argv, "--override-session-key"))
{
argc--; argv++;
if (!argc)
show_usage (1);
override_session_key = *argv;
argc--; argv++;
}
else if (!strncmp (*argv, "--", 2))
show_usage (1);
}
if (argc < 1 || argc > 2)
show_usage (1);
fp_in = fopen (argv[0], "rb");
if (!fp_in)
{
err = gpgme_error_from_syserror ();
fprintf (stderr, PGM ": can't open `%s': %s\n",
argv[0], gpgme_strerror (err));
exit (1);
}
init_gpgme (protocol);
err = gpgme_new (&ctx);
fail_if_err (err);
gpgme_set_protocol (ctx, protocol);
if (print_status)
{
gpgme_set_status_cb (ctx, status_cb, NULL);
gpgme_set_ctx_flag (ctx, "full-status", "1");
}
if (export_session_key)
{
err = gpgme_set_ctx_flag (ctx, "export-session-key", "1");
if (err)
{
fprintf (stderr, PGM ": error requesting exported session key: %s\n",
gpgme_strerror (err));
exit (1);
}
}
if (override_session_key)
{
err = gpgme_set_ctx_flag (ctx, "override-session-key",
override_session_key);
if (err)
{
fprintf (stderr, PGM ": error overriding session key: %s\n",
gpgme_strerror (err));
exit (1);
}
}
err = gpgme_data_new_from_stream (&in, fp_in);
if (err)
{
fprintf (stderr, PGM ": error allocating data object: %s\n",
gpgme_strerror (err));
exit (1);
}
err = gpgme_data_new (&out);
if (err)
{
fprintf (stderr, PGM ": error allocating data object: %s\n",
gpgme_strerror (err));
exit (1);
}
err = gpgme_op_decrypt (ctx, in, out);
result = gpgme_op_decrypt_result (ctx);
if (err)
{
fprintf (stderr, PGM ": decrypt failed: %s\n", gpgme_strerror (err));
exit (1);
}
if (result)
{
print_result (result);
print_data (out);
}
gpgme_data_release (out);
gpgme_data_release (in);
gpgme_release (ctx);
return 0;
}
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