/**
* @file			md5_helper.c
* @brief		MD5 checksum generation.
* @author		Patrick Roth - roth@stettbacher.ch
* @date			2010-04-30
* @copyright	2010 Stettbacher Signal Processing AG
* 
* @remarks
*
* <PRE>
* This 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
* </PRE>
*
*/

#include <stdio.h>

#include "md5.h"


/**
 * Generate the MD5 checksum.
 * 
 * @param	addr: 		A pointer to the start address.
 * @param	size:		The size to compare.
 * @param	buf: 		Destination buffer; must provide room for 32+1 chars!
 * @return	A pointer to the first digit of the generated MD5 checksum. The
 *          checksum's length is always 16 bytes.
 */
void getMd5ChecksumString(void *addr, ssize_t size, char *buf)
{
	MD5_CTX md5;
	
	MD5Init(&md5);
	MD5Update(&md5, (unsigned char*)(addr), (unsigned int)size);
	MD5Final(&md5);

	for(int i = 0; i < 16; i++) {
		sprintf(buf+i*2, "%02x", md5.digest[i]);
	}
    *(buf+32) = '\0';
}