/* $OpenBSD: xform.c,v 1.16 2001/08/28 12:20:43 ben Exp $ */
/*-
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr),
* Niels Provos (provos@physnet.uni-hamburg.de) and
* Damien Miller (djm@mindrot.org).
*
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
* in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Additional features in 1999 by Angelos D. Keromytis.
*
* AES XTS implementation in 2008 by Damien Miller
*
* Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
* Angelos D. Keromytis and Niels Provos.
*
* Copyright (C) 2001, Angelos D. Keromytis.
*
* Copyright (C) 2008, Damien Miller
* Copyright (c) 2014 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by John-Mark Gurney
* under sponsorship of the FreeBSD Foundation and
* Rubicon Communications, LLC (Netgate).
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <crypto/des/des.h>
#include <opencrypto/xform_enc.h>
static int des3_setkey(u_int8_t **, u_int8_t *, int);
static void des3_encrypt(caddr_t, u_int8_t *);
static void des3_decrypt(caddr_t, u_int8_t *);
static void des3_zerokey(u_int8_t **);
/* Encryption instances */
struct enc_xform enc_xform_3des = {
CRYPTO_3DES_CBC, "3DES",
DES3_BLOCK_LEN, DES3_BLOCK_LEN, TRIPLE_DES_MIN_KEY,
TRIPLE_DES_MAX_KEY,
des3_encrypt,
des3_decrypt,
des3_setkey,
des3_zerokey,
NULL,
};
/*
* Encryption wrapper routines.
*/
static void
des3_encrypt(caddr_t key, u_int8_t *blk)
{
des_cblock *cb = (des_cblock *) blk;
des_key_schedule *p = (des_key_schedule *) key;
des_ecb3_encrypt(cb, cb, p[0], p[1], p[2], DES_ENCRYPT);
}
static void
des3_decrypt(caddr_t key, u_int8_t *blk)
{
des_cblock *cb = (des_cblock *) blk;
des_key_schedule *p = (des_key_schedule *) key;
des_ecb3_encrypt(cb, cb, p[0], p[1], p[2], DES_DECRYPT);
}
static int
des3_setkey(u_int8_t **sched, u_int8_t *key, int len)
{
des_key_schedule *p;
int err;
p = KMALLOC(3*sizeof (des_key_schedule),
M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
if (p != NULL) {
des_set_key((des_cblock *)(key + 0), p[0]);
des_set_key((des_cblock *)(key + 8), p[1]);
des_set_key((des_cblock *)(key + 16), p[2]);
err = 0;
} else
err = ENOMEM;
*sched = (u_int8_t *) p;
return err;
}
static void
des3_zerokey(u_int8_t **sched)
{
bzero(*sched, 3*sizeof (des_key_schedule));
KFREE(*sched, M_CRYPTO_DATA);
*sched = NULL;
}
