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142 lines
3.7 KiB
C
142 lines
3.7 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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#include <opencrypto/xform_auth.h>
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#include <opencrypto/xform_enc.h>
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static int null_setkey(void *, const uint8_t *, int);
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static void null_crypt(void *, const uint8_t *, uint8_t *);
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static void null_crypt_multi(void *, const uint8_t *, uint8_t *, size_t);
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static void null_init(void *);
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static void null_reinit(void *ctx, const uint8_t *buf, u_int len);
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static int null_update(void *, const void *, u_int);
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static void null_final(uint8_t *, void *);
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/* Encryption instances */
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const struct enc_xform enc_xform_null = {
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.type = CRYPTO_NULL_CBC,
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.name = "NULL",
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/* NB: blocksize of 4 is to generate a properly aligned ESP header */
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.blocksize = NULL_BLOCK_LEN,
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.ivsize = 0,
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.minkey = NULL_MIN_KEY,
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.maxkey = NULL_MAX_KEY,
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.setkey = null_setkey,
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.encrypt = null_crypt,
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.decrypt = null_crypt,
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.encrypt_multi = null_crypt_multi,
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.decrypt_multi = null_crypt_multi,
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};
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/* Authentication instances */
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const struct auth_hash auth_hash_null = {
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.type = CRYPTO_NULL_HMAC,
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.name = "NULL-HMAC",
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.keysize = 0,
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.hashsize = NULL_HASH_LEN,
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.ctxsize = sizeof(int), /* NB: context isn't used */
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.blocksize = NULL_HMAC_BLOCK_LEN,
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.Init = null_init,
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.Setkey = null_reinit,
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.Reinit = null_reinit,
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.Update = null_update,
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.Final = null_final,
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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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null_crypt(void *key, const uint8_t *in, uint8_t *out)
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{
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if (in != out)
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memcpy(out, in, NULL_BLOCK_LEN);
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}
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static void
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null_crypt_multi(void *key, const uint8_t *in, uint8_t *out, size_t len)
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{
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if (in != out)
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memcpy(out, in, len);
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}
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static int
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null_setkey(void *sched, const uint8_t *key, int len)
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{
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return (0);
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}
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/*
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* And now for auth.
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*/
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static void
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null_init(void *ctx)
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{
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}
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static void
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null_reinit(void *ctx, const uint8_t *buf, u_int len)
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{
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}
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static int
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null_update(void *ctx, const void *buf, u_int len)
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{
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return (0);
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}
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static void
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null_final(uint8_t *buf, void *ctx)
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{
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bzero(buf, NULL_HASH_LEN);
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}
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