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95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* cipher.c - En-/De-ciphering filter
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* Copyright (C) 1998 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 <assert.h>
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#include "errors.h"
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#include "iobuf.h"
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#include "memory.h"
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#include "util.h"
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#include "filter.h"
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#include "packet.h"
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#include "options.h"
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/****************
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* This filter is used to en/de-cipher data with a conventional algorithm
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*/
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int
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cipher_filter( void *opaque, int control,
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IOBUF a, byte *buf, size_t *ret_len)
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{
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size_t size = *ret_len;
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cipher_filter_context_t *cfx = opaque;
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int rc=0;
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if( control == IOBUFCTRL_UNDERFLOW ) { /* decrypt */
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rc = -1; /* not yet used */
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}
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else if( control == IOBUFCTRL_FLUSH ) { /* encrypt */
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assert(a);
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if( !cfx->header ) {
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PACKET pkt;
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PKT_encrypted ed;
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byte temp[10];
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memset( &ed, 0, sizeof ed );
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ed.len = cfx->datalen;
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init_packet( &pkt );
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pkt.pkttype = PKT_ENCRYPTED;
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pkt.pkt.encrypted = &ed;
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if( build_packet( a, &pkt ))
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log_bug("build_packet(ENCR_DATA) failed\n");
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randomize_buffer( temp, 8, 1 );
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temp[8] = temp[6];
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temp[9] = temp[7];
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cfx->cipher_hd = cipher_open( cfx->dek->algo,
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CIPHER_MODE_AUTO_CFB, 1 );
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cipher_setkey( cfx->cipher_hd, cfx->dek->key, cfx->dek->keylen );
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cipher_setiv( cfx->cipher_hd, NULL );
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cipher_encrypt( cfx->cipher_hd, temp, temp, 10);
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cipher_sync( cfx->cipher_hd );
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iobuf_write(a, temp, 10);
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cfx->header=1;
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}
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cipher_encrypt( cfx->cipher_hd, buf, buf, size);
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if( iobuf_write( a, buf, size ) )
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rc = G10ERR_WRITE_FILE;
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}
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else if( control == IOBUFCTRL_FREE ) {
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cipher_close(cfx->cipher_hd);
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}
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else if( control == IOBUFCTRL_DESC ) {
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*(char**)buf = "cipher_filter";
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}
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return rc;
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}
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