diff options
Diffstat (limited to 'g10/cipher.c')
| -rw-r--r-- | g10/cipher.c | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/g10/cipher.c b/g10/cipher.c deleted file mode 100644 index ad7399dec..000000000 --- a/g10/cipher.c +++ /dev/null @@ -1,185 +0,0 @@ -/* cipher.c - Enciphering filter for the old CFB mode. - * Copyright (C) 1998-2003, 2006, 2009 Free Software Foundation, Inc. - * Copyright (C) 1998-2003, 2006, 2009, 2017 Werner koch - * - * 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 3 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, see <https://www.gnu.org/licenses/>. - * SPDX-License-Identifier: GPL-3.0+ - */ - -#include <config.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <errno.h> - -#include "gpg.h" -#include "../common/status.h" -#include "../common/iobuf.h" -#include "../common/util.h" -#include "filter.h" -#include "packet.h" -#include "options.h" -#include "main.h" -#include "../common/status.h" - - -#define MIN_PARTIAL_SIZE 512 - - -static void -write_header (cipher_filter_context_t *cfx, iobuf_t a) -{ - gcry_error_t err; - PACKET pkt; - PKT_encrypted ed; - byte temp[18]; - unsigned int blocksize; - unsigned int nprefix; - - blocksize = openpgp_cipher_get_algo_blklen (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; - if (cfx->dek->use_mdc) - { - ed.mdc_method = DIGEST_ALGO_SHA1; - gcry_md_open (&cfx->mdc_hash, DIGEST_ALGO_SHA1, 0); - if (DBG_HASHING) - gcry_md_debug (cfx->mdc_hash, "creatmdc"); - } - else if (!opt.no_mdc_warn) - { - log_info ("WARNING: " - "encrypting without integrity protection is dangerous\n"); - } - - write_status_printf (STATUS_BEGIN_ENCRYPTION, "%d %d", - ed.mdc_method, cfx->dek->algo); - - 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; - gcry_randomize (temp, nprefix, GCRY_STRONG_RANDOM ); - temp[nprefix] = temp[nprefix-2]; - temp[nprefix+1] = temp[nprefix-1]; - print_cipher_algo_note (cfx->dek->algo); - err = openpgp_cipher_open (&cfx->cipher_hd, - cfx->dek->algo, - GCRY_CIPHER_MODE_CFB, - (GCRY_CIPHER_SECURE - | ((cfx->dek->use_mdc || cfx->dek->algo >= 100)? - 0 : GCRY_CIPHER_ENABLE_SYNC))); - if (err) - { - /* We should never get an error here cause we already checked, - * that the algorithm is available. */ - BUG(); - } - - /* log_hexdump ("thekey", cfx->dek->key, cfx->dek->keylen); */ - gcry_cipher_setkey (cfx->cipher_hd, cfx->dek->key, cfx->dek->keylen); - gcry_cipher_setiv (cfx->cipher_hd, NULL, 0); - /* log_hexdump ("prefix", temp, nprefix+2); */ - if (cfx->mdc_hash) /* Hash the "IV". */ - gcry_md_write (cfx->mdc_hash, temp, nprefix+2 ); - gcry_cipher_encrypt (cfx->cipher_hd, temp, nprefix+2, NULL, 0); - gcry_cipher_sync (cfx->cipher_hd); - iobuf_write (a, temp, nprefix+2); - - cfx->short_blklen_warn = (blocksize < 16); - cfx->short_blklen_count = nprefix+2; - - cfx->wrote_header = 1; -} - - -/* - * This filter is used to en/de-cipher data with a symmetric algorithm - */ -int -cipher_filter_cfb (void *opaque, int control, - iobuf_t a, byte *buf, size_t *ret_len) -{ - cipher_filter_context_t *cfx = opaque; - size_t size = *ret_len; - int rc = 0; - - if (control == IOBUFCTRL_UNDERFLOW) /* decrypt */ - { - rc = -1; /* not yet used */ - } - else if (control == IOBUFCTRL_FLUSH) /* encrypt */ - { - log_assert (a); - if (!cfx->wrote_header) - write_header (cfx, a); - if (cfx->mdc_hash) - gcry_md_write (cfx->mdc_hash, buf, size); - gcry_cipher_encrypt (cfx->cipher_hd, buf, size, NULL, 0); - if (cfx->short_blklen_warn) - { - cfx->short_blklen_count += size; - if (cfx->short_blklen_count > (150 * 1024 * 1024)) - { - log_info ("WARNING: encrypting more than %d MiB with algorithm " - "%s should be avoided\n", 150, - openpgp_cipher_algo_name (cfx->dek->algo)); - cfx->short_blklen_warn = 0; /* Don't show again. */ - } - } - - rc = iobuf_write (a, buf, size); - } - else if (control == IOBUFCTRL_FREE) - { - if (cfx->mdc_hash) - { - byte *hash; - int hashlen = gcry_md_get_algo_dlen (gcry_md_get_algo(cfx->mdc_hash)); - byte temp[22]; - - log_assert (hashlen == 20); - /* We must hash the prefix of the MDC packet here. */ - temp[0] = 0xd3; - temp[1] = 0x14; - gcry_md_putc (cfx->mdc_hash, temp[0]); - gcry_md_putc (cfx->mdc_hash, temp[1]); - - gcry_md_final (cfx->mdc_hash); - hash = gcry_md_read (cfx->mdc_hash, 0); - memcpy(temp+2, hash, 20); - gcry_cipher_encrypt (cfx->cipher_hd, temp, 22, NULL, 0); - gcry_md_close (cfx->mdc_hash); cfx->mdc_hash = NULL; - if (iobuf_write( a, temp, 22)) - log_error ("writing MDC packet failed\n"); - } - - gcry_cipher_close (cfx->cipher_hd); - } - else if (control == IOBUFCTRL_DESC) - { - mem2str (buf, "cipher_filter_cfb", *ret_len); - } - - return rc; -} |