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/*
* PDFlow -- hash.c
*
* Copyright (c) 2010 Alberto Cuda
*
* This program 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.
*
* This program 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include "hash.h"
#ifdef HAVE_LIBSSL
#include <openssl/md5.h>
struct hash_status {
MD5_CTX ctxt;
};
enum s_status hash_init (struct hash_status **hsp)
{
struct hash_status *hs;
hs = malloc (sizeof (struct hash_status));
if (hs == NULL)
return S_CSC_OUT_OF_MEMORY;
if (!MD5_Init (&hs -> ctxt)) {
free (hs);
return S_CSC_OUT_OF_MEMORY;
}
*hsp = hs;
return S_CSC_OK;
}
enum s_status hash_update (struct hash_status *hs,
const void *data, unsigned len)
{
struct hash drop;
if (!MD5_Update (&hs -> ctxt, data, len)) {
MD5_Final (drop.data, &hs -> ctxt);
free (hs);
return S_CSC_OUT_OF_MEMORY;
}
return S_CSC_OK;
}
enum s_status hash_final (struct hash_status *hs, struct hash *data)
{
int res;
res = MD5_Final (data -> data, &hs -> ctxt);
free (hs);
return res ? S_CSC_OK : S_CSC_OUT_OF_MEMORY;
}
#else
struct hash_status {
int pos;
uint8_t buf [HASH_SIZE];
};
enum s_status hash_init (struct hash_status **hsp)
{
struct hash_status *hs;
hs = malloc (sizeof (struct hash_status));
if (hs == NULL)
return S_CSC_OUT_OF_MEMORY;
memset (hs, 0, sizeof (struct hash_status));
*hsp = hs;
return S_CSC_OK;
}
enum s_status hash_update (struct hash_status *hs,
const void *data, unsigned len)
{
const uint8_t *p;
int i;
p = data;
for (i = 0; i < len; i++) {
hs -> buf [hs -> pos] ^= p [i];
hs -> pos = (hs -> pos + 1) % HASH_SIZE;
}
return S_CSC_OK;
}
enum s_status hash_final (struct hash_status *hs, struct hash *data)
{
memcpy (data, hs -> buf, HASH_SIZE);
free (hs);
return S_CSC_OK;
}
#endif
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