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/* hash.c - Hash filters
* Copyright (C) 2002, 2003, 2007, 2008 Free Software Foundation
*
* Author: Timo Schulz
*
* This file is part of OpenCDK.
*
* The OpenCDK library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <assert.h>
#include <sys/stat.h>
#include "opencdk.h"
#include "main.h"
#include "filters.h"
static cdk_error_t
hash_encode (void *opaque, FILE *in, FILE *out)
{
md_filter_t *mfx = opaque;
byte buf[BUFSIZE];
gcry_error_t err;
int nread;
if (!mfx)
return CDK_Inv_Value;
_cdk_log_debug ("hash filter: encode algo=%d\n", mfx->digest_algo);
if (!mfx->md)
{
err = gcry_md_open (&mfx->md, mfx->digest_algo, 0);
if (err)
return map_gcry_error (err);
}
while (!feof (in))
{
nread = fread (buf, 1, BUFSIZE, in);
if (!nread)
break;
gcry_md_write (mfx->md, buf, nread);
}
wipemem (buf, sizeof (buf));
return 0;
}
cdk_error_t
_cdk_filter_hash (void *opaque, int ctl, FILE *in, FILE *out)
{
if (ctl == STREAMCTL_READ)
return hash_encode (opaque, in, out);
else if (ctl == STREAMCTL_FREE)
{
md_filter_t *mfx = opaque;
if (mfx)
{
_cdk_log_debug ("free hash filter\n");
gcry_md_close (mfx->md);
mfx->md = NULL;
return 0;
}
}
return CDK_Inv_Mode;
}
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