mirror of
git://git.gnupg.org/gnupg.git
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6a8c47bd29
Allow to specify a recipient on the commandline There is still a default hardwired recipient if none has been set.
460 lines
11 KiB
C
460 lines
11 KiB
C
/* verify.c - Verify a messages signature
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* Copyright (C) 2001 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <time.h>
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#include <assert.h>
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#include <gcrypt.h>
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#include <ksba.h>
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#include "gpgsm.h"
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#include "keydb.h"
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#include "i18n.h"
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/* FIXME: Move this to jnlib */
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static char *
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strtimestamp (time_t atime)
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{
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char *buffer = xmalloc (15);
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if (atime < 0)
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strcpy (buffer, "????" "-??" "-??");
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else if (!atime)
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strcpy (buffer, "none");
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else
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{
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struct tm *tp;
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tp = gmtime( &atime );
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sprintf (buffer, "%04d-%02d-%02d",
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1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday);
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}
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return buffer;
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}
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/* fixme: duplicated from import.c */
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static void
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store_cert (KsbaCert cert)
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{
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KEYDB_HANDLE kh;
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int rc;
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kh = keydb_new (0);
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if (!kh)
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{
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log_error (_("failed to allocated keyDB handle\n"));
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return;
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}
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rc = keydb_locate_writable (kh, 0);
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if (rc)
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log_error (_("error finding writable keyDB: %s\n"), gnupg_strerror (rc));
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rc = keydb_insert_cert (kh, cert);
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if (rc)
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{
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log_error (_("error storing certificate: %s\n"), gnupg_strerror (rc));
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}
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keydb_release (kh);
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}
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static void
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print_integer (unsigned char *p)
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{
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unsigned long len;
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if (!p)
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log_printf ("none");
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else
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{
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len = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
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for (p+=4; len; len--, p++)
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log_printf ("%02X", *p);
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}
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}
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static void
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print_time (time_t t)
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{
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if (!t)
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log_printf ("none");
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else if ( t == (time_t)(-1) )
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log_printf ("error");
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else
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{
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struct tm *tp;
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tp = gmtime (&t);
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log_printf ("%04d-%02d-%02d %02d:%02d:%02d",
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1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday,
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tp->tm_hour, tp->tm_min, tp->tm_sec);
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assert (!tp->tm_isdst);
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}
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}
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static void
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hash_data (int fd, GCRY_MD_HD md)
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{
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FILE *fp;
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char buffer[4096];
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int nread;
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fp = fdopen ( dup (fd), "rb");
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if (!fp)
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{
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log_error ("fdopen(%d) failed: %s\n", fd, strerror (errno));
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return;
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}
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do
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{
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nread = fread (buffer, 1, DIM(buffer), fp);
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gcry_md_write (md, buffer, nread);
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}
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while (nread);
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if (ferror (fp))
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log_error ("read error on fd %d: %s\n", fd, strerror (errno));
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fclose (fp);
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}
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/* Perform a verify operation. To verify detached signatures, data_fd
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must be different than -1 */
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int
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gpgsm_verify (CTRL ctrl, int in_fd, int data_fd)
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{
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int i, rc;
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Base64Context b64reader = NULL;
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KsbaError err;
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KsbaReader reader;
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KsbaCMS cms = NULL;
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KsbaStopReason stopreason;
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KsbaCert cert;
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KEYDB_HANDLE kh;
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GCRY_MD_HD data_md = NULL;
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int signer;
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const char *algoid;
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int algo;
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int is_detached;
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FILE *fp = NULL;
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kh = keydb_new (0);
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if (!kh)
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{
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log_error (_("failed to allocated keyDB handle\n"));
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rc = GNUPG_General_Error;
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goto leave;
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}
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fp = fdopen ( dup (in_fd), "rb");
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if (!fp)
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{
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log_error ("fdopen() failed: %s\n", strerror (errno));
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rc = seterr (IO_Error);
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goto leave;
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}
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rc = gpgsm_create_reader (&b64reader, ctrl, fp, &reader);
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if (rc)
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{
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log_error ("can't create reader: %s\n", gnupg_strerror (rc));
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goto leave;
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}
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cms = ksba_cms_new ();
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if (!cms)
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{
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rc = seterr (Out_Of_Core);
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goto leave;
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}
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err = ksba_cms_set_reader_writer (cms, reader, NULL);
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if (err)
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{
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log_debug ("ksba_cms_set_reader_writer failed: %s\n",
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ksba_strerror (err));
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rc = map_ksba_err (err);
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goto leave;
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}
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data_md = gcry_md_open (0, 0);
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if (!data_md)
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{
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rc = map_gcry_err (gcry_errno());
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log_error ("md_open failed: %s\n", gcry_strerror (-1));
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goto leave;
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}
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is_detached = 0;
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do
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{
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err = ksba_cms_parse (cms, &stopreason);
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if (err)
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{
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log_debug ("ksba_cms_parse failed: %s\n", ksba_strerror (err));
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rc = map_ksba_err (err);
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goto leave;
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}
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if (stopreason == KSBA_SR_NEED_HASH)
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{
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is_detached = 1;
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log_debug ("Detached signature\n");
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}
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if (stopreason == KSBA_SR_BEGIN_DATA)
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{
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log_error ("error: only detached signatures are supportted\n");
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rc = GNUPG_Not_Implemented;
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goto leave;
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}
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if (stopreason == KSBA_SR_NEED_HASH
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|| stopreason == KSBA_SR_BEGIN_DATA)
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{ /* We are now able to enable the hash algorithms */
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for (i=0; (algoid=ksba_cms_get_digest_algo_list (cms, i)); i++)
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{
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algo = gcry_md_map_name (algoid);
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if (!algo)
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log_error ("unknown hash algorithm `%s'\n",
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algoid? algoid:"?");
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else
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gcry_md_enable (data_md, algo);
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}
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if (is_detached)
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{
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if (data_fd == -1)
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{
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log_error ("detached signature but no data given\n");
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rc = GNUPG_Bad_Signature;
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goto leave;
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}
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hash_data (data_fd, data_md);
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}
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}
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}
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while (stopreason != KSBA_SR_READY);
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if (data_fd != -1 && !is_detached)
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{
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log_error ("data given for a non-detached signature\n");
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rc = GNUPG_Conflict;
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goto leave;
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}
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for (i=0; (cert=ksba_cms_get_cert (cms, i)); i++)
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{
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log_debug ("storing certifcate %d\n", i);
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/* Fixme: we should mark the stored certificates as temporary
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and put them in a cache first */
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store_cert (cert);
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ksba_cert_release (cert);
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}
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cert = NULL;
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err = 0;
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for (signer=0; signer < 1; signer++)
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{
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char *issuer = NULL;
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char *sigval = NULL;
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time_t sigtime;
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unsigned char *serial;
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char *msgdigest = NULL;
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size_t msgdigestlen;
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err = ksba_cms_get_issuer_serial (cms, signer, &issuer, &serial);
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if (err)
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break;
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log_debug ("signer %d - issuer: `%s'\n", signer, issuer? issuer:"[NONE]");
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log_debug ("signer %d - serial: ", signer);
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print_integer (serial);
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log_printf ("\n");
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err = ksba_cms_get_signing_time (cms, signer, &sigtime);
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if (err)
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{
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log_debug ("error getting signing time: %s\n", ksba_strerror (err));
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sigtime = (time_t)-1;
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}
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log_debug ("signer %d - sigtime: ", signer);
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print_time (sigtime);
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log_printf ("\n");
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err = ksba_cms_get_message_digest (cms, signer,
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&msgdigest, &msgdigestlen);
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if (err)
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break;
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algoid = ksba_cms_get_digest_algo (cms, signer);
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algo = gcry_md_map_name (algoid);
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log_debug ("signer %d - digest algo: %d\n", signer, algo);
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if ( !gcry_md_info (data_md, GCRYCTL_IS_ALGO_ENABLED, &algo, NULL) )
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{
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log_debug ("digest algo %d has not been enabled\n", algo);
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goto next_signer;
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}
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sigval = ksba_cms_get_sig_val (cms, signer);
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if (!sigval)
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{
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log_error ("no signature value available\n");
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goto next_signer;
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}
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log_debug ("signer %d - signature: `%s'\n", signer, sigval);
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/* Find the certificate of the signer */
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keydb_search_reset (kh);
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rc = keydb_search_issuer_sn (kh, issuer, serial);
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if (rc)
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{
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log_debug ("failed to find the certificate: %s\n",
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gnupg_strerror(rc));
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goto next_signer;
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}
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rc = keydb_get_cert (kh, &cert);
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if (rc)
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{
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log_debug ("failed to get cert: %s\n", gnupg_strerror (rc));
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goto next_signer;
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}
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if (msgdigest)
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{ /* Signed attributes are available. */
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GCRY_MD_HD md;
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unsigned char *s;
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/* check that the message digest in the signed attributes
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matches the one we calculated on the data */
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s = gcry_md_read (data_md, algo);
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if ( !s || !msgdigestlen
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|| gcry_md_get_algo_dlen (algo) != msgdigestlen
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|| !s || memcmp (s, msgdigest, msgdigestlen) )
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{
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log_error ("message digest attribute does not "
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"match calculated one\n");
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gpgsm_status (ctrl, STATUS_BADSIG, NULL);
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goto next_signer;
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}
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md = gcry_md_open (algo, 0);
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if (!md)
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{
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log_error ("md_open failed: %s\n", gcry_strerror (-1));
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goto next_signer;
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}
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ksba_cms_set_hash_function (cms, HASH_FNC, md);
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rc = ksba_cms_hash_signed_attrs (cms, signer);
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if (rc)
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{
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log_debug ("hashing signed attrs failed: %s\n",
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ksba_strerror (rc));
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gcry_md_close (md);
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goto next_signer;
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}
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rc = gpgsm_check_cms_signature (cert, sigval, md, algo);
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gcry_md_close (md);
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}
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else
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{
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rc = gpgsm_check_cms_signature (cert, sigval, data_md, algo);
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}
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if (rc)
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{
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log_error ("invalid signature: %s\n", gnupg_strerror (rc));
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gpgsm_status (ctrl, STATUS_BADSIG, NULL);
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goto next_signer;
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}
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log_debug ("signature okay - checking certs\n");
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gpgsm_status (ctrl, STATUS_GOODSIG, NULL);
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{
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char *buf, *fpr, *tstr;
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fpr = gpgsm_get_fingerprint_hexstring (cert, GCRY_MD_SHA1);
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tstr = strtimestamp (sigtime);
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buf = xmalloc ( strlen(fpr) + strlen (tstr) + 100);
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sprintf (buf, "%s %s %lu", fpr, tstr, (unsigned long)sigtime );
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xfree (tstr);
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xfree (fpr);
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gpgsm_status (ctrl, STATUS_VALIDSIG, buf);
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xfree (buf);
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}
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rc = gpgsm_validate_path (cert);
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if (rc)
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{
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log_error ("invalid certification path: %s\n", gnupg_strerror (rc));
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if (rc == GNUPG_Bad_Certificate_Path
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|| rc == GNUPG_Bad_Certificate)
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gpgsm_status (ctrl, STATUS_TRUST_NEVER, NULL);
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else
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gpgsm_status (ctrl, STATUS_TRUST_UNDEFINED, NULL);
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goto next_signer;
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}
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log_info ("signature is good\n");
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gpgsm_status (ctrl, STATUS_TRUST_FULLY, NULL);
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next_signer:
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rc = 0;
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xfree (issuer);
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xfree (serial);
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xfree (sigval);
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xfree (msgdigest);
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ksba_cert_release (cert);
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cert = NULL;
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}
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rc = 0;
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if (err)
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{
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log_debug ("ksba error: %s\n", ksba_strerror (err));
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rc = map_ksba_err (rc);
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}
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leave:
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ksba_cms_release (cms);
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gpgsm_destroy_reader (b64reader);
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keydb_release (kh);
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gcry_md_close (data_md);
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if (fp)
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fclose (fp);
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return rc;
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}
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