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 __FBSDID("$FreeBSD: releng/11.1/sys/opencrypto/xform_null.c 292963 2015-12-30 22:43:07Z allanjude $");
52
53 #include <opencrypto/xform_auth.h>
54 #include <opencrypto/xform_enc.h>
55
56 static int null_setkey(u_int8_t **, u_int8_t *, int);
57 static void null_encrypt(caddr_t, u_int8_t *);
58 static void null_decrypt(caddr_t, u_int8_t *);
59 static void null_zerokey(u_int8_t **);
60
61 static void null_init(void *);
62 static void null_reinit(void *ctx, const u_int8_t *buf, u_int16_t len);
63 static int null_update(void *, const u_int8_t *, u_int16_t);
64 static void null_final(u_int8_t *, void *);
65
66 /* Encryption instances */
67 struct enc_xform enc_xform_null = {
68 CRYPTO_NULL_CBC, "NULL",
69 /* NB: blocksize of 4 is to generate a properly aligned ESP header */
70 NULL_BLOCK_LEN, 0, NULL_MIN_KEY, NULL_MAX_KEY,
71 null_encrypt,
72 null_decrypt,
73 null_setkey,
74 null_zerokey,
75 NULL,
76 };
77
78 /* Authentication instances */
79 struct auth_hash auth_hash_null = { /* NB: context isn't used */
80 CRYPTO_NULL_HMAC, "NULL-HMAC",
81 NULL_HMAC_KEY_LEN, NULL_HASH_LEN, sizeof(int), NULL_HMAC_BLOCK_LEN,
82 null_init, null_reinit, null_reinit, null_update, null_final
83 };
84
85 /*
86 * Encryption wrapper routines.
87 */
88 static void
89 null_encrypt(caddr_t key, u_int8_t *blk)
90 {
91 }
92
93 static void
94 null_decrypt(caddr_t key, u_int8_t *blk)
95 {
96 }
97
98 static int
99 null_setkey(u_int8_t **sched, u_int8_t *key, int len)
100 {
101 *sched = NULL;
102 return 0;
103 }
104
105 static void
106 null_zerokey(u_int8_t **sched)
107 {
108 *sched = NULL;
109 }
110
111 /*
112 * And now for auth.
113 */
114
115 static void
116 null_init(void *ctx)
117 {
118 }
119
120 static void
121 null_reinit(void *ctx, const u_int8_t *buf, u_int16_t len)
122 {
123 }
124
125 static int
126 null_update(void *ctx, const u_int8_t *buf, u_int16_t len)
127 {
128 return 0;
129 }
130
131 static void
132 null_final(u_int8_t *buf, void *ctx)
133 {
134 if (buf != (u_int8_t *) 0)
135 bzero(buf, 12);
136 }
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