/*	$OpenBSD: tcfs_crypto.c,v 1.3 2000/06/17 20:25:54 provos Exp $	*/
/*
 * Copyright 2000 The TCFS Project at http://tcfs.dia.unisa.it/
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the authors may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include <sys/param.h>

#include <miscfs/tcfs/tcfs_cipher.h>

#define	BLOCKSIZE	1024
#define SBLOCKSIZE	8
#define D_NOBLK(o)      ((o)/BLOCKSIZE+(o%BLOCKSIZE?1:0))


void 
mkencrypt(struct tcfs_mount *mp, char *block, int nb, void *ks)
{
	int i,r;
	char *tmp;
	
	tmp = block;
	r = nb;
	for(i = 0; i < D_NOBLK(nb) && r > 0; i++) {
		TCFS_ENCRYPT(mp, tmp, MIN(BLOCKSIZE, r), ks);
		tmp += BLOCKSIZE;
		r -= BLOCKSIZE;
	}
}

void
mkdecrypt(struct tcfs_mount *mp, char *block, int nb, void *ks)
{
	int i,r;
	char *tmp;
	
	tmp = block;
	r = nb;
	for(i = 0; i < D_NOBLK(nb) && r > 0; i++) {
		TCFS_DECRYPT(mp, tmp, MIN(BLOCKSIZE, r), ks);
		tmp += BLOCKSIZE;
		r -= BLOCKSIZE;
	}
}