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