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0e36c4c6a7
~/.gnupg-test/private-keys-v1.d/<keygrip-as-20-byte-hex-number>. I will post a sample key to gpa-dev.
341 lines
9.1 KiB
C
341 lines
9.1 KiB
C
/* certcheck.c - check one certificate
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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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static int
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do_encode_md (GCRY_MD_HD md, int algo, unsigned int nbits,
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GCRY_MPI *r_val)
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{
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int nframe = (nbits+7) / 8;
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byte *frame;
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int i, n;
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byte asn[100];
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size_t asnlen;
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size_t len;
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asnlen = DIM(asn);
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if (gcry_md_algo_info (algo, GCRYCTL_GET_ASNOID, asn, &asnlen))
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{
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log_error ("No object identifier for algo %d\n", algo);
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return GNUPG_Internal_Error;
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}
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len = gcry_md_get_algo_dlen (algo);
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if ( len + asnlen + 4 > nframe )
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{
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log_error ("can't encode a %d bit MD into a %d bits frame\n",
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(int)(len*8), (int)nbits);
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return GNUPG_Internal_Error;
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}
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/* We encode the MD in this way:
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*
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* 0 A PAD(n bytes) 0 ASN(asnlen bytes) MD(len bytes)
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*
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* PAD consists of FF bytes.
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*/
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frame = xtrymalloc (nframe);
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if (!frame)
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return GNUPG_Out_Of_Core;
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n = 0;
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frame[n++] = 0;
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frame[n++] = 1; /* block type */
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i = nframe - len - asnlen -3 ;
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assert ( i > 1 );
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memset ( frame+n, 0xff, i ); n += i;
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frame[n++] = 0;
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memcpy ( frame+n, asn, asnlen ); n += asnlen;
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memcpy ( frame+n, gcry_md_read(md, algo), len ); n += len;
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assert ( n == nframe );
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if (DBG_X509)
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{
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int j;
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log_debug ("encoded hash:");
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for (j=0; j < nframe; j++)
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log_printf (" %02X", frame[j]);
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log_printf ("\n");
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}
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gcry_mpi_scan (r_val, GCRYMPI_FMT_USG, frame, &nframe);
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xfree (frame);
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return 0;
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}
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/*
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Check the signature on CERT using the ISSUER-CERT. This function
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does only test the cryptographic signature and nothing else. It is
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assumed that the ISSUER_CERT is valid. */
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int
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gpgsm_check_cert_sig (KsbaCert issuer_cert, KsbaCert cert)
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{
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const char *algoid;
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GCRY_MD_HD md;
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int rc, algo;
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GCRY_MPI frame;
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char *p;
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GCRY_SEXP s_sig, s_hash, s_pkey;
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algo = gcry_md_map_name ( (algoid=ksba_cert_get_digest_algo (cert)));
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if (!algo)
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{
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log_error ("unknown hash algorithm `%s'\n", algoid? algoid:"?");
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return GNUPG_General_Error;
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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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return GNUPG_General_Error;
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}
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rc = ksba_cert_hash (cert, 1, HASH_FNC, md);
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if (rc)
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{
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log_error ("ksba_cert_hash failed: %s\n", ksba_strerror (rc));
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gcry_md_close (md);
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return map_ksba_err (rc);
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}
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gcry_md_final (md);
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p = ksba_cert_get_sig_val (cert); /* fixme: check p*/
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if (DBG_X509)
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log_debug ("signature: %s\n", p);
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rc = gcry_sexp_sscan ( &s_sig, NULL, p, strlen(p));
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if (rc)
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{
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log_error ("gcry_sexp_scan failed: %s\n", gcry_strerror (rc));
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return map_gcry_err (rc);
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}
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p = ksba_cert_get_public_key (issuer_cert);
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if (DBG_X509)
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log_debug ("issuer public key: %s\n", p);
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rc = gcry_sexp_sscan ( &s_pkey, NULL, p, strlen(p));
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if (rc)
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{
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log_error ("gcry_sexp_scan failed: %s\n", gcry_strerror (rc));
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return map_gcry_err (rc);
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}
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rc = do_encode_md (md, algo, gcry_pk_get_nbits (s_pkey), &frame);
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if (rc)
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{
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/* fixme: clean up some things */
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return rc;
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}
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/* put hash into the S-Exp s_hash */
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if ( gcry_sexp_build (&s_hash, NULL, "%m", frame) )
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BUG ();
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rc = gcry_pk_verify (s_sig, s_hash, s_pkey);
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if (DBG_CRYPTO)
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log_debug ("gcry_pk_verify: %s\n", gcry_strerror (rc));
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return map_gcry_err (rc);
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}
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int
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gpgsm_check_cms_signature (KsbaCert cert, const char *sigval,
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GCRY_MD_HD md, int algo)
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{
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int rc;
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char *p;
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GCRY_MPI frame;
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GCRY_SEXP s_sig, s_hash, s_pkey;
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rc = gcry_sexp_sscan (&s_sig, NULL, sigval, strlen(sigval));
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if (rc)
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{
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log_error ("gcry_sexp_scan failed: %s\n", gcry_strerror (rc));
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return map_gcry_err (rc);
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}
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if (getenv ("GPGSM_FAKE_KEY"))
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{
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const char n[] = "#8732A669BB7C5057AD070EFA54E035C86DF474F7A7EBE2435"
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"3DADEB86FFE74C32AEEF9E5C6BD7584CB572520167B3E8C89A1FA75C74FF9E938"
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"2710F3B270B638EB96E7486491D81C53CA8A50B4E840B1C7458A4A1E52EC18D681"
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"8A2805C9165827F77EF90D55014E4B2AF9386AE8F6462F46A547CB593ABD509311"
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"4D3D16375F#";
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const char e[] = "#11#";
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char *tmp;
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log_debug ("Using HARDWIRED public key\n");
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asprintf (&tmp, "(public-key(rsa(n %s)(e %s)))", n, e);
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/* asprintf does not use our allocation fucntions, so we can't
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use our free */
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p = xstrdup (tmp);
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free (tmp);
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}
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else
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{
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p = ksba_cert_get_public_key (cert);
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}
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if (DBG_X509)
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log_debug ("public key: %s\n", p);
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rc = gcry_sexp_sscan ( &s_pkey, NULL, p, strlen(p));
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if (rc)
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{
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log_error ("gcry_sexp_scan failed: %s\n", gcry_strerror (rc));
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return map_gcry_err (rc);
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}
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rc = do_encode_md (md, algo, gcry_pk_get_nbits (s_pkey), &frame);
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if (rc)
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{
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/* fixme: clean up some things */
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return rc;
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}
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/* put hash into the S-Exp s_hash */
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if ( gcry_sexp_build (&s_hash, NULL, "%m", frame) )
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BUG ();
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rc = gcry_pk_verify (s_sig, s_hash, s_pkey);
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if (DBG_CRYPTO)
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log_debug ("gcry_pk_verify: %s\n", gcry_strerror (rc));
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return map_gcry_err (rc);
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}
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int
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gpgsm_create_cms_signature (KsbaCert cert, GCRY_MD_HD md, int mdalgo,
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char **r_sigval)
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{
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#if 0
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/* our sample key */
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const char n[] = "#8732A669BB7C5057AD070EFA54E035C86DF474F7A7EBE2435"
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"3DADEB86FFE74C32AEEF9E5C6BD7584CB572520167B3E8C89A1FA75C74FF9E938"
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"2710F3B270B638EB96E7486491D81C53CA8A50B4E840B1C7458A4A1E52EC18D681"
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"8A2805C9165827F77EF90D55014E4B2AF9386AE8F6462F46A547CB593ABD509311"
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"4D3D16375F#";
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const char e[] = "#11#";
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const char d[] = "#07F3EBABDDDA22D7FB1E8869140D30571586D9B4370DE02213F"
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"DD0DDAC3C24FC6BEFF0950BB0CAAD755F7AA788DA12BCF90987341AC8781CC7115"
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"B59A115B05D9D99B3D7AF77854DC2EE6A36154512CC0EAD832601038A88E837112"
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"AB2A39FD9FBE05E30D6FFA6F43D71C59F423CA43BC91C254A8C89673AB61F326B0"
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"762FBC9#";
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const char p[] = "#B2ABAD4328E66303E206C53CFBED17F18F712B1C47C966EE13DD"
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"AA9AD3616A610ADF513F8376FA48BAE12FED64CECC1E73091A77B45119AF0FC1286A"
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"85BD9BBD#";
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const char q[] = "#C1B648B294BB9AEE7FEEB77C4F64E9333E4EA9A7C54D521356FB"
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"BBB7558A0E7D6331EC7B42E3F0CD7BBBA9B7A013422F615F10DCC1E8462828BF8FC7"
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"39C5E34B#";
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const char u[] = "#A9B5EFF9C80A4A356B9A95EB63E381B262071E5CE9C1F32FF03"
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"83AD8289BED8BC690555E54411FA2FDB9B49638A21B2046C325F5633B4B1ECABEBFD"
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"1B3519072#";
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GCRY_SEXP s_skey, s_hash, s_sig;
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GCRY_MPI frame;
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int rc;
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char *buf;
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size_t len;
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/* create a secret key as an sexp */
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log_debug ("Using HARDWIRED secret key\n");
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asprintf (&buf, "(private-key(oid.1.2.840.113549.1.1.1"
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"(n %s)(e %s)(d %s)(p %s)(q %s)(u %s)))",
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n, e, d, p, q, u);
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/* asprintf does not use our allocation fucntions, so we can't
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use our free */
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rc = gcry_sexp_sscan (&s_skey, NULL, buf, strlen(buf));
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free (buf);
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if (rc)
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{
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log_error ("failed to build S-Exp: %s\n", gcry_strerror (rc));
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return map_gcry_err (rc);
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}
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/* put the hash into a sexp */
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rc = do_encode_md (md, mdalgo, gcry_pk_get_nbits (s_skey), &frame);
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if (rc)
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{
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/* fixme: clean up some things */
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return rc;
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}
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if ( gcry_sexp_build (&s_hash, NULL, "%m", frame) )
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BUG ();
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/* sign */
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rc = gcry_pk_sign (&s_sig, s_hash, s_skey);
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if (rc)
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{
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log_error ("signing failed: %s\n", gcry_strerror (rc));
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return map_gcry_err (rc);
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}
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len = gcry_sexp_sprint (s_sig, GCRYSEXP_FMT_CANON, NULL, 0);
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assert (len);
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buf = xmalloc (len);
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len = gcry_sexp_sprint (s_sig, GCRYSEXP_FMT_CANON, buf, len);
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assert (len);
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*r_sigval = buf;
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#else
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int rc;
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char *grip;
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size_t siglen;
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grip = gpgsm_get_keygrip_hexstring (cert);
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if (!grip)
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return seterr (Bad_Certificate);
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rc = gpgsm_agent_pksign (grip, gcry_md_read(md, mdalgo),
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gcry_md_get_algo_dlen (mdalgo), mdalgo,
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r_sigval, &siglen);
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xfree (grip);
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/* FIXME: we should check that the returnes S-Exp is valid fits int
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siglen. It ould probaly be a good idea to scan and print it
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again to make this sure and be sure that we have canocical
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encoding */
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#endif
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return rc;
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}
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