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/* compat.c - Various compatibility functions
* Copyright 2011, 2012 Gergely Nagy <algernon@balabit.hu>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "config.h"
#if WITH_OPENSSL
#include "compat.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/md5.h>
struct _GChecksum
{
GChecksumType type;
char hex_digest[33];
MD5_CTX context;
};
GChecksum *
g_checksum_new (GChecksumType checksum_type)
{
GChecksum *chk;
if (checksum_type != G_CHECKSUM_MD5)
{
errno = ENOSYS;
return NULL;
}
chk = calloc (1, sizeof (GChecksum));
chk->type = checksum_type;
MD5_Init (&chk->context);
return chk;
}
void
g_checksum_free (GChecksum *checksum)
{
if (checksum)
free (checksum);
}
void
g_checksum_update (GChecksum *checksum,
const unsigned char *data,
ssize_t length)
{
size_t l = length;
if (!checksum || !data || length == 0)
{
errno = EINVAL;
return;
}
errno = 0;
if (length < 0)
l = strlen ((const char *)data);
MD5_Update (&checksum->context, (const void *)data, l);
}
const char *
g_checksum_get_string (GChecksum *checksum)
{
unsigned char digest[16];
static const char hex[16] =
{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f'};
int i;
if (!checksum)
{
errno = EINVAL;
return NULL;
}
MD5_Final (digest, &checksum->context);
for (i = 0; i < 16; i++)
{
checksum->hex_digest[2 * i] = hex[(digest[i] & 0xf0) >> 4];
checksum->hex_digest[2 * i + 1] = hex[digest[i] & 0x0f];
}
checksum->hex_digest[32] = '\0';
return checksum->hex_digest;
}
#endif /* WITH_OPENSSL */
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