118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
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/* $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 <opencrypto/skipjack.h>
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#include <opencrypto/xform_enc.h>
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static int skipjack_setkey(u_int8_t **, u_int8_t *, int);
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static void skipjack_encrypt(caddr_t, u_int8_t *);
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static void skipjack_decrypt(caddr_t, u_int8_t *);
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static void skipjack_zerokey(u_int8_t **);
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/* Encryption instances */
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struct enc_xform enc_xform_skipjack = {
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CRYPTO_SKIPJACK_CBC, "Skipjack",
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SKIPJACK_BLOCK_LEN, SKIPJACK_BLOCK_LEN, SKIPJACK_MIN_KEY,
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SKIPJACK_MAX_KEY,
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skipjack_encrypt,
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skipjack_decrypt, skipjack_setkey,
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skipjack_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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skipjack_encrypt(caddr_t key, u_int8_t *blk)
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{
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skipjack_forwards(blk, blk, (u_int8_t **) key);
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}
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static void
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skipjack_decrypt(caddr_t key, u_int8_t *blk)
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{
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skipjack_backwards(blk, blk, (u_int8_t **) key);
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}
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static int
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skipjack_setkey(u_int8_t **sched, u_int8_t *key, int len)
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{
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int err;
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/* NB: allocate all the memory that's needed at once */
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*sched = KMALLOC(10 * (sizeof(u_int8_t *) + 0x100),
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M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
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if (*sched != NULL) {
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u_int8_t** key_tables = (u_int8_t**) *sched;
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u_int8_t* table = (u_int8_t*) &key_tables[10];
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int k;
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for (k = 0; k < 10; k++) {
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key_tables[k] = table;
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table += 0x100;
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}
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subkey_table_gen(key, (u_int8_t **) *sched);
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err = 0;
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} else
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err = ENOMEM;
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return err;
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}
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static void
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skipjack_zerokey(u_int8_t **sched)
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{
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bzero(*sched, 10 * (sizeof(u_int8_t *) + 0x100));
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KFREE(*sched, M_CRYPTO_DATA);
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*sched = NULL;
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}
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