diff options
Diffstat (limited to 'g10/cipher.c')
| -rw-r--r-- | g10/cipher.c | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/g10/cipher.c b/g10/cipher.c deleted file mode 100644 index cb9f14916..000000000 --- a/g10/cipher.c +++ /dev/null @@ -1,152 +0,0 @@ -/* cipher.c - En-/De-ciphering filter - * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc. - * - * This file is part of GnuPG. - * - * GnuPG is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * GnuPG is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA - */ - -#include <config.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <errno.h> -#include <assert.h> - -#include "errors.h" -#include "iobuf.h" -#include "memory.h" -#include "util.h" -#include "filter.h" -#include "packet.h" -#include "options.h" -#include "main.h" -#include "status.h" - - -#define MIN_PARTIAL_SIZE 512 - - -static void -write_header( cipher_filter_context_t *cfx, IOBUF a ) -{ - PACKET pkt; - PKT_encrypted ed; - byte temp[18]; - unsigned blocksize; - unsigned nprefix; - - blocksize = cipher_get_blocksize( cfx->dek->algo ); - if( blocksize < 8 || blocksize > 16 ) - log_fatal("unsupported blocksize %u\n", blocksize ); - - memset( &ed, 0, sizeof ed ); - ed.len = cfx->datalen; - ed.extralen = blocksize+2; - ed.new_ctb = !ed.len && !opt.rfc1991; - if( cfx->dek->use_mdc ) { - ed.mdc_method = DIGEST_ALGO_SHA1; - cfx->mdc_hash = md_open( DIGEST_ALGO_SHA1, 0 ); - if ( DBG_HASHING ) - md_start_debug( cfx->mdc_hash, "creatmdc" ); - } - - { - char buf[20]; - - sprintf (buf, "%d %d", ed.mdc_method, cfx->dek->algo); - write_status_text (STATUS_BEGIN_ENCRYPTION, buf); - } - - init_packet( &pkt ); - pkt.pkttype = cfx->dek->use_mdc? PKT_ENCRYPTED_MDC : PKT_ENCRYPTED; - pkt.pkt.encrypted = &ed; - if( build_packet( a, &pkt )) - log_bug("build_packet(ENCR_DATA) failed\n"); - nprefix = blocksize; - randomize_buffer( temp, nprefix, 1 ); - temp[nprefix] = temp[nprefix-2]; - temp[nprefix+1] = temp[nprefix-1]; - print_cipher_algo_note( cfx->dek->algo ); - cfx->cipher_hd = cipher_open( cfx->dek->algo, - cfx->dek->use_mdc? CIPHER_MODE_CFB - : CIPHER_MODE_AUTO_CFB, 1 ); -/* log_hexdump( "thekey", cfx->dek->key, cfx->dek->keylen );*/ - cipher_setkey( cfx->cipher_hd, cfx->dek->key, cfx->dek->keylen ); - cipher_setiv( cfx->cipher_hd, NULL, 0 ); -/* log_hexdump( "prefix", temp, nprefix+2 ); */ - if( cfx->mdc_hash ) /* hash the "IV" */ - md_write( cfx->mdc_hash, temp, nprefix+2 ); - cipher_encrypt( cfx->cipher_hd, temp, temp, nprefix+2); - cipher_sync( cfx->cipher_hd ); - iobuf_write(a, temp, nprefix+2); - cfx->header=1; -} - - - -/**************** - * This filter is used to en/de-cipher data with a conventional algorithm - */ -int -cipher_filter( void *opaque, int control, - IOBUF a, byte *buf, size_t *ret_len) -{ - size_t size = *ret_len; - cipher_filter_context_t *cfx = opaque; - int rc=0; - - if( control == IOBUFCTRL_UNDERFLOW ) { /* decrypt */ - rc = -1; /* not yet used */ - } - else if( control == IOBUFCTRL_FLUSH ) { /* encrypt */ - assert(a); - if( !cfx->header ) { - write_header( cfx, a ); - } - if( cfx->mdc_hash ) - md_write( cfx->mdc_hash, buf, size ); - cipher_encrypt( cfx->cipher_hd, buf, buf, size); - if( iobuf_write( a, buf, size ) ) - rc = G10ERR_WRITE_FILE; - } - else if( control == IOBUFCTRL_FREE ) { - if( cfx->mdc_hash ) { - byte *hash; - int hashlen = md_digest_length( md_get_algo( cfx->mdc_hash ) ); - byte temp[22]; - - assert( hashlen == 20 ); - /* we must hash the prefix of the MDC packet here */ - temp[0] = 0xd3; - temp[1] = 0x14; - md_putc( cfx->mdc_hash, temp[0] ); - md_putc( cfx->mdc_hash, temp[1] ); - - md_final( cfx->mdc_hash ); - hash = md_read( cfx->mdc_hash, 0 ); - memcpy(temp+2, hash, 20); - cipher_encrypt( cfx->cipher_hd, temp, temp, 22 ); - md_close( cfx->mdc_hash ); cfx->mdc_hash = NULL; - if( iobuf_write( a, temp, 22 ) ) - log_error("writing MDC packet failed\n" ); - } - cipher_close(cfx->cipher_hd); - } - else if( control == IOBUFCTRL_DESC ) { - *(char**)buf = "cipher_filter"; - } - return rc; -} |