quakeforge-old/common/net_com.c

/*
	net_com.c

	MD4-based checksum utility functions

	Copyright (C) 1999,2000  contributors of the QuakeForge project
	Please see the file "AUTHORS" for a list of contributors

	Author: Jeff Teunissen	<d2deek@pmail.net>
	Date: 01 Jan 2000

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#include <mdfour.h>

unsigned
Com_BlockChecksum ( void *buffer, int length )
{
	int				digest[4];
	unsigned 		val;

	mdfour ( (unsigned char *) digest, (unsigned char *) buffer, length );

	val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];

	return val;
}

void
Com_BlockFullChecksum ( void *buffer, int len, unsigned char *outbuf )
{
	mdfour ( outbuf, (unsigned char *) buffer, len );
}