1/*	$OpenBSD: xform.c,v 1.16 2001/08/28 12:20:43 ben Exp $	*/
2/*-
3 * The authors of this code are John Ioannidis (ji@tla.org),
4 * Angelos D. Keromytis (kermit@csd.uch.gr),
5 * Niels Provos (provos@physnet.uni-hamburg.de) and
6 * Damien Miller (djm@mindrot.org).
7 *
8 * This code was written by John Ioannidis for BSD/OS in Athens, Greece,
9 * in November 1995.
10 *
11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
12 * by Angelos D. Keromytis.
13 *
14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
15 * and Niels Provos.
16 *
17 * Additional features in 1999 by Angelos D. Keromytis.
18 *
19 * AES XTS implementation in 2008 by Damien Miller
20 *
21 * Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
22 * Angelos D. Keromytis and Niels Provos.
23 *
24 * Copyright (C) 2001, Angelos D. Keromytis.
25 *
26 * Copyright (C) 2008, Damien Miller
27 * Copyright (c) 2014 The FreeBSD Foundation
28 * All rights reserved.
29 *
30 * Portions of this software were developed by John-Mark Gurney
31 * under sponsorship of the FreeBSD Foundation and
32 * Rubicon Communications, LLC (Netgate).
33 *
34 * Permission to use, copy, and modify this software with or without fee
35 * is hereby granted, provided that this entire notice is included in
36 * all copies of any software which is or includes a copy or
37 * modification of this software.
38 * You may use this code under the GNU public license if you so wish. Please
39 * contribute changes back to the authors under this freer than GPL license
40 * so that we may further the use of strong encryption without limitations to
41 * all.
42 *
43 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
44 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
45 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
46 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
47 * PURPOSE.
48 */
49
50#include <sys/cdefs.h>
51#include <opencrypto/xform_auth.h>
52#include <opencrypto/xform_enc.h>
53
54static	int null_setkey(void *, const uint8_t *, int);
55static	void null_crypt(void *, const uint8_t *, uint8_t *);
56static	void null_crypt_multi(void *, const uint8_t *, uint8_t *, size_t);
57
58static	void null_init(void *);
59static	void null_reinit(void *ctx, const uint8_t *buf, u_int len);
60static	int null_update(void *, const void *, u_int);
61static	void null_final(uint8_t *, void *);
62
63/* Encryption instances */
64const struct enc_xform enc_xform_null = {
65	.type = CRYPTO_NULL_CBC,
66	.name = "NULL",
67	/* NB: blocksize of 4 is to generate a properly aligned ESP header */
68	.blocksize = NULL_BLOCK_LEN,
69	.ivsize = 0,
70	.minkey = NULL_MIN_KEY,
71	.maxkey = NULL_MAX_KEY,
72	.setkey = null_setkey,
73	.encrypt = null_crypt,
74	.decrypt = null_crypt,
75	.encrypt_multi = null_crypt_multi,
76	.decrypt_multi = null_crypt_multi,
77};
78
79/* Authentication instances */
80const struct auth_hash auth_hash_null = {
81	.type = CRYPTO_NULL_HMAC,
82	.name = "NULL-HMAC",
83	.keysize = 0,
84	.hashsize = NULL_HASH_LEN,
85	.ctxsize = sizeof(int),	/* NB: context isn't used */
86	.blocksize = NULL_HMAC_BLOCK_LEN,
87	.Init = null_init,
88	.Setkey = null_reinit,
89	.Reinit = null_reinit,
90	.Update = null_update,
91	.Final = null_final,
92};
93
94/*
95 * Encryption wrapper routines.
96 */
97static void
98null_crypt(void *key, const uint8_t *in, uint8_t *out)
99{
100	if (in != out)
101		memcpy(out, in, NULL_BLOCK_LEN);
102}
103
104static void
105null_crypt_multi(void *key, const uint8_t *in, uint8_t *out, size_t len)
106{
107	if (in != out)
108		memcpy(out, in, len);
109}
110
111static int
112null_setkey(void *sched, const uint8_t *key, int len)
113{
114	return (0);
115}
116
117/*
118 * And now for auth.
119 */
120
121static void
122null_init(void *ctx)
123{
124}
125
126static void
127null_reinit(void *ctx, const uint8_t *buf, u_int len)
128{
129}
130
131static int
132null_update(void *ctx, const void *buf, u_int len)
133{
134	return (0);
135}
136
137static void
138null_final(uint8_t *buf, void *ctx)
139{
140	bzero(buf, NULL_HASH_LEN);
141}
142