1997-11-18 15:06:00 +01:00
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/* seckey-cert.c - secret key certifucate packet handling
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1998-02-24 19:50:46 +01:00
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* Copyright (C) 1998 Free Software Foundation, Inc.
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1997-11-18 15:06:00 +01:00
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*
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1998-02-24 19:50:46 +01:00
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* This file is part of GNUPG.
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1997-11-18 15:06:00 +01:00
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*
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1998-02-24 19:50:46 +01:00
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* GNUPG is free software; you can redistribute it and/or modify
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1997-11-18 15:06:00 +01:00
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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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1998-02-24 19:50:46 +01:00
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* GNUPG is distributed in the hope that it will be useful,
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1997-11-18 15:06:00 +01:00
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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 <assert.h>
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#include "util.h"
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#include "memory.h"
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#include "packet.h"
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#include "mpi.h"
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#include "keydb.h"
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#include "cipher.h"
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1998-04-07 20:16:10 +02:00
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#include "main.h"
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#include "options.h"
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1997-11-18 15:06:00 +01:00
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1997-11-24 23:24:04 +01:00
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static int
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1997-12-01 11:33:23 +01:00
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check_elg( PKT_secret_cert *cert )
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1997-11-18 15:06:00 +01:00
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{
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1997-12-09 13:46:23 +01:00
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byte *buffer;
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1998-01-16 22:15:24 +01:00
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u16 csum=0;
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1997-11-18 15:06:00 +01:00
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int res;
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1997-12-09 13:46:23 +01:00
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unsigned nbytes;
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1997-11-18 15:06:00 +01:00
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u32 keyid[2];
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1998-01-02 21:40:10 +01:00
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char save_iv[8];
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1997-11-18 15:06:00 +01:00
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1998-04-02 12:30:03 +02:00
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if( cert->is_protected ) { /* remove the protection */
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1997-11-24 23:24:04 +01:00
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DEK *dek = NULL;
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1997-12-09 13:46:23 +01:00
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MPI test_x;
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1998-04-07 20:16:10 +02:00
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CIPHER_HANDLE cipher_hd=NULL;
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1997-11-24 23:24:04 +01:00
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1998-04-02 12:30:03 +02:00
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switch( cert->protect.algo ) {
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1998-01-16 22:15:24 +01:00
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case CIPHER_ALGO_NONE: BUG(); break;
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1997-11-24 23:24:04 +01:00
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case CIPHER_ALGO_BLOWFISH:
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1998-04-04 22:16:55 +02:00
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case CIPHER_ALGO_CAST:
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1997-11-24 23:24:04 +01:00
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keyid_from_skc( cert, keyid );
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1998-04-02 12:30:03 +02:00
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if( cert->protect.s2k == 1 || cert->protect.s2k == 3 )
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1998-02-24 19:50:46 +01:00
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dek = get_passphrase_hash( keyid, NULL,
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1998-04-02 12:30:03 +02:00
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cert->protect.salt );
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1998-02-24 19:50:46 +01:00
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else
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dek = get_passphrase_hash( keyid, NULL, NULL );
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1998-04-07 20:16:10 +02:00
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cipher_hd = cipher_open( cert->protect.algo,
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CIPHER_MODE_AUTO_CFB, 1);
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cipher_setkey( cipher_hd, dek->key, dek->keylen );
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cipher_setiv( cipher_hd, NULL );
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1997-12-09 13:46:23 +01:00
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m_free(dek); /* pw is in secure memory, so m_free() burns it */
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1998-04-02 12:30:03 +02:00
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memcpy(save_iv, cert->protect.iv, 8 );
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1998-04-07 20:16:10 +02:00
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cipher_decrypt( cipher_hd, cert->protect.iv, cert->protect.iv, 8 );
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1998-02-02 15:36:06 +01:00
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mpi_set_secure(cert->d.elg.x );
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1998-02-24 19:50:46 +01:00
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/*fixme: maybe it is better to set the buffer secure with a
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1998-02-02 15:36:06 +01:00
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* new get_buffer_secure() function */
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1997-12-09 13:46:23 +01:00
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buffer = mpi_get_buffer( cert->d.elg.x, &nbytes, NULL );
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1998-04-07 20:16:10 +02:00
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cipher_decrypt( cipher_hd, buffer, buffer, nbytes );
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1997-12-09 13:46:23 +01:00
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test_x = mpi_alloc_secure( mpi_get_nlimbs(cert->d.elg.x) );
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mpi_set_buffer( test_x, buffer, nbytes, 0 );
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1998-04-07 20:16:10 +02:00
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csum = checksum_mpi( test_x );
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1997-12-09 13:46:23 +01:00
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m_free( buffer );
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1998-04-07 20:16:10 +02:00
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cipher_close( cipher_hd );
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1997-11-24 23:24:04 +01:00
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/* now let's see wether we have used the right passphrase */
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1998-04-02 12:30:03 +02:00
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if( csum != cert->csum ) {
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1998-04-07 20:16:10 +02:00
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/* very bad kludge to work around an early bug */
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csum -= checksum_u16( mpi_get_nbits(test_x) );
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nbytes = mpi_get_nlimbs(test_x) * 4;
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csum += checksum_u16( nbytes*8 );
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if( csum != cert->csum ) {
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mpi_free(test_x);
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memcpy( cert->protect.iv, save_iv, 8 );
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return G10ERR_BAD_PASS;
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}
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if( !opt.batch )
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log_info("Probably you have an old key - use "
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"\"--change-passphrase\" to convert.\n");
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1997-12-09 13:46:23 +01:00
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}
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1997-11-18 15:06:00 +01:00
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1998-04-08 21:49:02 +02:00
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mpi_swap( cert->d.elg.x, test_x );
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res = elg_check_secret_key( &cert->d.elg );
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mpi_swap( cert->d.elg.x, test_x );
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1997-12-09 13:46:23 +01:00
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if( !res ) {
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mpi_free(test_x);
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1998-04-02 12:30:03 +02:00
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memcpy( cert->protect.iv, save_iv, 8 );
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1997-11-24 23:24:04 +01:00
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return G10ERR_BAD_PASS;
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1997-12-09 13:46:23 +01:00
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}
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mpi_set(cert->d.elg.x, test_x);
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mpi_free(test_x);
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1998-04-02 12:30:03 +02:00
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cert->is_protected = 0;
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1997-11-24 23:24:04 +01:00
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break;
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default:
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1998-04-02 12:30:03 +02:00
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return G10ERR_CIPHER_ALGO; /* unsupported protection algorithm */
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1997-11-24 23:24:04 +01:00
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}
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}
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1997-12-09 13:46:23 +01:00
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else { /* not protected */
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1998-04-07 20:16:10 +02:00
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csum = checksum_mpi( cert->d.elg.x );
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if( csum != cert->csum ) {
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/* very bad kludge to work around an early bug */
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csum -= checksum_u16( mpi_get_nbits(cert->d.elg.x) );
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nbytes = mpi_get_nlimbs(cert->d.elg.x) * 4;
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csum += checksum_u16( nbytes*8 );
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if( csum != cert->csum )
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return G10ERR_CHECKSUM;
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if( !opt.batch )
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log_info("Probably you have an old key - use "
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"\"--change-passphrase\" to convert.\n");
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}
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1997-12-09 13:46:23 +01:00
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}
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return 0;
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}
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1998-03-09 22:44:06 +01:00
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static int
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check_dsa( PKT_secret_cert *cert )
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{
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byte *buffer;
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u16 csum=0;
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int res;
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unsigned nbytes;
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u32 keyid[2];
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char save_iv[8];
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1998-04-02 12:30:03 +02:00
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if( cert->is_protected ) { /* remove the protection */
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1998-03-09 22:44:06 +01:00
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DEK *dek = NULL;
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MPI test_x;
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1998-04-07 20:16:10 +02:00
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CIPHER_HANDLE cipher_hd=NULL;
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1998-03-09 22:44:06 +01:00
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1998-04-02 12:30:03 +02:00
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switch( cert->protect.algo ) {
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1998-03-09 22:44:06 +01:00
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case CIPHER_ALGO_NONE: BUG(); break;
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case CIPHER_ALGO_BLOWFISH:
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1998-04-04 22:16:55 +02:00
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case CIPHER_ALGO_CAST:
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1998-03-09 22:44:06 +01:00
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keyid_from_skc( cert, keyid );
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1998-04-02 12:30:03 +02:00
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if( cert->protect.s2k == 1 || cert->protect.s2k == 3 )
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1998-03-09 22:44:06 +01:00
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dek = get_passphrase_hash( keyid, NULL,
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1998-04-02 12:30:03 +02:00
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cert->protect.salt );
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1998-03-09 22:44:06 +01:00
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else
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dek = get_passphrase_hash( keyid, NULL, NULL );
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1998-04-07 20:16:10 +02:00
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cipher_hd = cipher_open( cert->protect.algo,
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CIPHER_MODE_AUTO_CFB, 1);
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cipher_setkey( cipher_hd, dek->key, dek->keylen );
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cipher_setiv( cipher_hd, NULL );
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1998-03-09 22:44:06 +01:00
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m_free(dek); /* pw is in secure memory, so m_free() burns it */
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1998-04-02 12:30:03 +02:00
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memcpy(save_iv, cert->protect.iv, 8 );
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1998-04-07 20:16:10 +02:00
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cipher_decrypt( cipher_hd, cert->protect.iv, cert->protect.iv, 8 );
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1998-03-09 22:44:06 +01:00
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mpi_set_secure(cert->d.dsa.x );
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/*fixme: maybe it is better to set the buffer secure with a
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* new get_buffer_secure() function */
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buffer = mpi_get_buffer( cert->d.dsa.x, &nbytes, NULL );
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1998-04-07 20:16:10 +02:00
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cipher_decrypt( cipher_hd, buffer, buffer, nbytes );
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1998-03-09 22:44:06 +01:00
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test_x = mpi_alloc_secure( mpi_get_nlimbs(cert->d.dsa.x) );
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mpi_set_buffer( test_x, buffer, nbytes, 0 );
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1998-04-07 20:16:10 +02:00
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csum = checksum_mpi( test_x );
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1998-03-09 22:44:06 +01:00
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m_free( buffer );
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1998-04-07 20:16:10 +02:00
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cipher_close( cipher_hd );
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1998-03-09 22:44:06 +01:00
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/* now let's see wether we have used the right passphrase */
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1998-04-02 12:30:03 +02:00
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if( csum != cert->csum ) {
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1998-03-09 22:44:06 +01:00
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mpi_free(test_x);
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1998-04-02 12:30:03 +02:00
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memcpy( cert->protect.iv, save_iv, 8 );
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1998-03-09 22:44:06 +01:00
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return G10ERR_BAD_PASS;
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}
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1998-04-08 21:49:02 +02:00
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mpi_swap( cert->d.dsa.x, test_x );
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res = dsa_check_secret_key( &cert->d.dsa );
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mpi_swap( cert->d.dsa.x, test_x );
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1998-03-09 22:44:06 +01:00
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if( !res ) {
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mpi_free(test_x);
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1998-04-02 12:30:03 +02:00
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memcpy( cert->protect.iv, save_iv, 8 );
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1998-03-09 22:44:06 +01:00
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return G10ERR_BAD_PASS;
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}
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mpi_set(cert->d.dsa.x, test_x);
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mpi_free(test_x);
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1998-04-02 12:30:03 +02:00
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cert->is_protected = 0;
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1998-03-09 22:44:06 +01:00
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break;
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default:
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return G10ERR_CIPHER_ALGO; /* unsupport protection algorithm */
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}
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}
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else { /* not protected */
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1998-04-07 20:16:10 +02:00
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csum = checksum_mpi( cert->d.dsa.x );
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1998-04-02 12:30:03 +02:00
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if( csum != cert->csum )
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1998-03-09 22:44:06 +01:00
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return G10ERR_CHECKSUM;
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}
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return 0;
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}
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1997-11-24 23:24:04 +01:00
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#ifdef HAVE_RSA_CIPHER
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1998-04-07 20:16:10 +02:00
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/****************
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* FIXME: fix checksum stuff
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*/
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1997-11-24 23:24:04 +01:00
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static int
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1997-12-01 11:33:23 +01:00
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check_rsa( PKT_secret_cert *cert )
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1997-11-24 23:24:04 +01:00
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{
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1997-12-09 13:46:23 +01:00
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byte *buffer;
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1998-01-16 22:15:24 +01:00
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u16 csum=0;
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1997-11-24 23:24:04 +01:00
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int res;
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1997-12-09 13:46:23 +01:00
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unsigned nbytes;
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1997-11-24 23:24:04 +01:00
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u32 keyid[2];
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1997-11-18 15:06:00 +01:00
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1998-04-02 12:30:03 +02:00
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if( cert->is_protected ) { /* remove the protection */
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1997-11-18 15:06:00 +01:00
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DEK *dek = NULL;
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BLOWFISH_context *blowfish_ctx=NULL;
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1998-04-02 12:30:03 +02:00
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switch( cert->protect.algo ) {
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1997-12-09 13:46:23 +01:00
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/* FIXME: use test variables to check for the correct key */
|
1998-01-16 22:15:24 +01:00
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case CIPHER_ALGO_NONE: BUG(); break;
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1997-11-18 15:06:00 +01:00
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case CIPHER_ALGO_BLOWFISH:
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1997-11-24 23:24:04 +01:00
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keyid_from_skc( cert, keyid );
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1998-03-03 09:43:28 +01:00
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dek = get_passphrase_hash( keyid, NULL, NULL );
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1997-11-24 12:04:11 +01:00
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blowfish_ctx = m_alloc_secure( sizeof *blowfish_ctx );
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1997-12-09 13:46:23 +01:00
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blowfish_setkey( blowfish_ctx, dek->key, dek->keylen );
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m_free(dek); /* pw is in secure memory, so m_free() burns it */
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blowfish_setiv( blowfish_ctx, NULL );
|
1998-04-02 12:30:03 +02:00
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blowfish_decode_cfb( blowfish_ctx, cert->protect.iv,
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cert->protect.iv, 8 );
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1997-12-09 13:46:23 +01:00
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csum = 0;
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#define X(a) do { \
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1998-02-02 15:36:06 +01:00
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mpi_set_secure(cert->d.rsa.rsa_##a); \
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1997-12-09 13:46:23 +01:00
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buffer = mpi_get_buffer( cert->d.rsa.rsa_##a, &nbytes, NULL );\
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csum += checksum_u16( nbytes*8 ); \
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blowfish_decode_cfb( blowfish_ctx, buffer, buffer, nbytes ); \
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csum += checksum( buffer, nbytes ); \
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mpi_set_buffer(cert->d.rsa.rsa_##a, buffer, nbytes, 0 ); \
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m_free( buffer ); \
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} while(0)
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1997-11-18 15:06:00 +01:00
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X(d);
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X(p);
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X(q);
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X(u);
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#undef X
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1998-04-02 12:30:03 +02:00
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cert->is_protected = 0;
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1997-12-09 13:46:23 +01:00
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m_free( blowfish_ctx );
|
1997-11-18 15:06:00 +01:00
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|
|
/* now let's see wether we have used the right passphrase */
|
1998-04-02 12:30:03 +02:00
|
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|
if( csum != cert->csum )
|
1997-11-18 15:06:00 +01:00
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return G10ERR_BAD_PASS;
|
1997-12-09 13:46:23 +01:00
|
|
|
|
1998-04-08 21:49:02 +02:00
|
|
|
res = rsa_check_secret_key( &cert->d.rsa );
|
1997-12-09 13:46:23 +01:00
|
|
|
if( !res )
|
1997-11-18 15:06:00 +01:00
|
|
|
return G10ERR_BAD_PASS;
|
|
|
|
break;
|
|
|
|
|
|
|
|
default:
|
1997-12-09 13:46:23 +01:00
|
|
|
return G10ERR_CIPHER_ALGO; /* unsupported protection algorithm */
|
1997-11-18 15:06:00 +01:00
|
|
|
}
|
|
|
|
}
|
1997-12-09 13:46:23 +01:00
|
|
|
else { /* not protected */
|
|
|
|
csum =0;
|
|
|
|
buffer = mpi_get_buffer( cert->d.rsa.rsa_d, &nbytes, NULL );
|
|
|
|
csum += checksum_u16( nbytes*8 );
|
|
|
|
csum += checksum( buffer, nbytes );
|
|
|
|
m_free( buffer );
|
|
|
|
buffer = mpi_get_buffer( cert->d.rsa.rsa_p, &nbytes, NULL );
|
|
|
|
csum += checksum_u16( nbytes*8 );
|
|
|
|
csum += checksum( buffer, nbytes );
|
|
|
|
m_free( buffer );
|
|
|
|
buffer = mpi_get_buffer( cert->d.rsa.rsa_q, &nbytes, NULL );
|
|
|
|
csum += checksum_u16( nbytes*8 );
|
|
|
|
csum += checksum( buffer, nbytes );
|
|
|
|
m_free( buffer );
|
|
|
|
buffer = mpi_get_buffer( cert->d.rsa.rsa_u, &nbytes, NULL );
|
|
|
|
csum += checksum_u16( nbytes*8 );
|
|
|
|
csum += checksum( buffer, nbytes );
|
|
|
|
m_free( buffer );
|
1998-04-02 12:30:03 +02:00
|
|
|
if( csum != cert->csum )
|
1997-12-09 13:46:23 +01:00
|
|
|
return G10ERR_CHECKSUM;
|
1997-11-18 15:06:00 +01:00
|
|
|
}
|
1997-12-09 13:46:23 +01:00
|
|
|
|
1997-11-18 15:06:00 +01:00
|
|
|
return 0;
|
|
|
|
}
|
1997-11-24 23:24:04 +01:00
|
|
|
#endif /*HAVE_RSA_CIPHER*/
|
|
|
|
|
|
|
|
|
|
|
|
|
1997-11-18 15:06:00 +01:00
|
|
|
|
1997-11-24 23:24:04 +01:00
|
|
|
/****************
|
|
|
|
* Check the secret key certificate
|
1997-12-09 13:46:23 +01:00
|
|
|
* Ask up to 3 time for a correct passphrase
|
1997-11-24 23:24:04 +01:00
|
|
|
*/
|
|
|
|
int
|
1997-12-01 11:33:23 +01:00
|
|
|
check_secret_key( PKT_secret_cert *cert )
|
1997-11-24 23:24:04 +01:00
|
|
|
{
|
1997-12-09 13:46:23 +01:00
|
|
|
int rc = G10ERR_BAD_PASS;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for(i=0; i < 3 && rc == G10ERR_BAD_PASS; i++ ) {
|
|
|
|
if( i )
|
|
|
|
log_error("Invalid passphrase; please try again ...\n");
|
|
|
|
if( cert->pubkey_algo == PUBKEY_ALGO_ELGAMAL )
|
|
|
|
rc = check_elg( cert );
|
1998-03-09 22:44:06 +01:00
|
|
|
else if( cert->pubkey_algo == PUBKEY_ALGO_DSA )
|
|
|
|
rc = check_dsa( cert );
|
1997-12-09 13:46:23 +01:00
|
|
|
#ifdef HAVE_RSA_CIPHER
|
|
|
|
else if( cert->pubkey_algo == PUBKEY_ALGO_RSA )
|
|
|
|
rc = check_rsa( cert );
|
|
|
|
#endif
|
|
|
|
else
|
|
|
|
rc = G10ERR_PUBKEY_ALGO;
|
1998-01-02 21:40:10 +01:00
|
|
|
if( get_passphrase_fd() != -1 )
|
|
|
|
break;
|
1997-12-09 13:46:23 +01:00
|
|
|
}
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
1998-01-06 22:01:36 +01:00
|
|
|
/****************
|
|
|
|
* check wether the secret key is protected.
|
|
|
|
* Returns: 0 not protected, -1 on error or the protection algorithm
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
is_secret_key_protected( PKT_secret_cert *cert )
|
|
|
|
{
|
1998-04-02 12:30:03 +02:00
|
|
|
return cert->is_protected? cert->protect.algo : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int
|
1998-04-07 20:16:10 +02:00
|
|
|
do_protect( void (*fnc)(CIPHER_HANDLE, byte *, byte *, unsigned),
|
|
|
|
CIPHER_HANDLE fnc_hd, PKT_secret_cert *cert )
|
1998-04-02 12:30:03 +02:00
|
|
|
{
|
|
|
|
byte *buffer;
|
|
|
|
unsigned nbytes;
|
|
|
|
|
|
|
|
switch( cert->pubkey_algo ) {
|
|
|
|
case PUBKEY_ALGO_ELGAMAL:
|
1998-04-07 20:16:10 +02:00
|
|
|
/* recalculate the checksum, so that --change-passphrase
|
|
|
|
* can be used to convert from the faulty to the correct one
|
|
|
|
* wk 06.04.98:
|
|
|
|
* fixme: remove this some time in the future.
|
|
|
|
*/
|
|
|
|
cert->csum = checksum_mpi( cert->d.elg.x );
|
1998-04-02 12:30:03 +02:00
|
|
|
buffer = mpi_get_buffer( cert->d.elg.x, &nbytes, NULL );
|
1998-04-07 20:16:10 +02:00
|
|
|
(*fnc)( fnc_hd, buffer, buffer, nbytes );
|
1998-04-02 12:30:03 +02:00
|
|
|
mpi_set_buffer( cert->d.elg.x, buffer, nbytes, 0 );
|
|
|
|
m_free( buffer );
|
|
|
|
break;
|
|
|
|
|
|
|
|
case PUBKEY_ALGO_DSA:
|
|
|
|
buffer = mpi_get_buffer( cert->d.dsa.x, &nbytes, NULL );
|
1998-04-07 20:16:10 +02:00
|
|
|
(*fnc)( fnc_hd, buffer, buffer, nbytes );
|
1998-04-02 12:30:03 +02:00
|
|
|
mpi_set_buffer( cert->d.dsa.x, buffer, nbytes, 0 );
|
|
|
|
m_free( buffer );
|
|
|
|
break;
|
|
|
|
|
|
|
|
default: return G10ERR_PUBKEY_ALGO;
|
|
|
|
}
|
|
|
|
return 0;
|
1998-01-06 22:01:36 +01:00
|
|
|
}
|
|
|
|
|
1997-12-09 13:46:23 +01:00
|
|
|
|
|
|
|
/****************
|
|
|
|
* Protect the secret key certificate with the passphrase from DEK
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
protect_secret_key( PKT_secret_cert *cert, DEK *dek )
|
|
|
|
{
|
1998-04-02 12:30:03 +02:00
|
|
|
int rc=0;
|
|
|
|
|
1997-12-09 13:46:23 +01:00
|
|
|
if( !dek )
|
|
|
|
return 0;
|
|
|
|
|
1998-04-02 12:30:03 +02:00
|
|
|
if( !cert->is_protected ) { /* okay, apply the protection */
|
1998-04-07 20:16:10 +02:00
|
|
|
CIPHER_HANDLE cipher_hd=NULL;
|
1998-04-02 12:30:03 +02:00
|
|
|
|
|
|
|
switch( cert->protect.algo ) {
|
|
|
|
case CIPHER_ALGO_NONE: BUG(); break;
|
|
|
|
case CIPHER_ALGO_BLOWFISH:
|
1998-04-04 22:16:55 +02:00
|
|
|
case CIPHER_ALGO_CAST:
|
1998-04-07 20:16:10 +02:00
|
|
|
cipher_hd = cipher_open( cert->protect.algo,
|
|
|
|
CIPHER_MODE_AUTO_CFB, 1 );
|
|
|
|
cipher_setkey( cipher_hd, dek->key, dek->keylen );
|
|
|
|
cipher_setiv( cipher_hd, NULL );
|
|
|
|
cipher_encrypt( cipher_hd, cert->protect.iv, cert->protect.iv, 8 );
|
|
|
|
if( !do_protect( &cipher_encrypt, cipher_hd, cert ) )
|
1998-04-04 22:16:55 +02:00
|
|
|
cert->is_protected = 1;
|
1998-04-07 20:16:10 +02:00
|
|
|
cipher_close( cipher_hd );
|
1998-04-04 22:16:55 +02:00
|
|
|
break;
|
|
|
|
|
1998-04-02 12:30:03 +02:00
|
|
|
default:
|
|
|
|
rc = G10ERR_CIPHER_ALGO; /* unsupport protection algorithm */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return rc;
|
1997-11-24 23:24:04 +01:00
|
|
|
}
|
1997-11-18 15:06:00 +01:00
|
|
|
|