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/* $OpenBSD: tcfs_cipher_TDES.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 <sys/systm.h>
#include <sys/malloc.h>
#include <miscfs/tcfs/tcfs_cipher.h>
#include <crypto/des_locl.h>
#include <crypto/des.h>
void *
TDES_init_key (char *key)
{
des_key_schedule *ks;
ks = (des_key_schedule *)malloc (2 * sizeof (des_key_schedule),
M_FREE, M_NOWAIT);
if (!ks)
return NULL;
des_set_key ((des_cblock *)key, ks[0]);
des_set_key ((des_cblock *)(key + 8), ks[1]);
return (void *)ks;
}
void
TDES_cleanup_key(void *k)
{
/* tcfs_keytab_dispnode does it
free((des_key_schedule*)k,M_FREE);
*/
}
void
TDES_encrypt(char *block, int nb, void *key)
{
u_int32_t * xi;
int i;
char *tmp;
des_key_schedule *ks = (des_key_schedule *)key;
xi = (u_int32_t *)block;
tmp = block;
des_ecb3_encrypt((des_cblock *)tmp, (des_cblock *)tmp,
ks[0],ks[1],ks[0],DES_ENCRYPT);
tmp += 8;
for (i = 1;i < nb/8;i++) {
*(xi+2) ^= *xi;
*(xi+3) ^= *(xi + 1);
des_ecb3_encrypt((des_cblock *)tmp, (des_cblock *)tmp,
ks[0], ks[1], ks[0], DES_ENCRYPT);
tmp += 8;
xi += 2;
}
}
void
TDES_decrypt(char *block, int nb, void *key)
{
u_int32_t * xi, xo[2], xa[2];
int i;
char *tmp;
des_key_schedule *ks = (des_key_schedule *)key;
xi = (u_int32_t *)block;
tmp = block;
xo[0] = *xi; xo[1] = *(xi+1);
des_ecb3_encrypt((des_cblock *)tmp, (des_cblock *)tmp,
ks[0], ks[1], ks[0], DES_DECRYPT);
tmp += 8;
xi = (u_int32_t *)tmp;
for (i = 1;i < nb/8; i++) {
xa[0] = *xi; xa[1] = *(xi+1);
des_ecb3_encrypt((des_cblock *)tmp, (des_cblock *)tmp,
ks[0], ks[1], ks[0], DES_DECRYPT);
*(xi) ^= xo[0];
*(xi+1)^= xo[1];
xo[0] = xa[0];
xo[1] = xa[1];
tmp += 8;
xi += 2;
}
}
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