1 /* mdfilter.c - filter data and calculate a message digest
2 * Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
4 * This file is part of GnuPG.
6 * GnuPG is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
11 * GnuPG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <https://www.gnu.org/licenses/>.
35 * This filter is used to collect a message digest
38 md_filter( void *opaque, int control,
39 IOBUF a, byte *buf, size_t *ret_len)
41 size_t size = *ret_len;
42 md_filter_context_t *mfx = opaque;
45 if( control == IOBUFCTRL_UNDERFLOW ) {
46 if( mfx->maxbuf_size && size > mfx->maxbuf_size )
47 size = mfx->maxbuf_size;
48 i = iobuf_read( a, buf, size );
51 gcry_md_write(mfx->md, buf, i );
53 gcry_md_write(mfx->md2, buf, i );
59 else if( control == IOBUFCTRL_DESC )
60 mem2str (buf, "md_filter", *ret_len);
66 free_md_filter_context( md_filter_context_t *mfx )
68 gcry_md_close(mfx->md);
69 gcry_md_close(mfx->md2);