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/* $OpenBSD: tcfs_crypto.c,v 1.2 2000/06/17 17:32:26 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 "tcfs_cipher.h"
#define BLOCKSIZE 1024
#define SBLOCKSIZE 8
#define MIN(a,b) ((a)<(b)?(a):(b))
#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;
}
}
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