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("$FreeBSD$");
52
53 #include <opencrypto/xform_auth.h>
54 #include <opencrypto/xform_enc.h>
55
56 static int null_setkey(void *, const uint8_t *, int);
57 static void null_crypt(void *, const uint8_t *, uint8_t *);
58 static void null_crypt_multi(void *, const uint8_t *, uint8_t *, size_t);
59
60 static void null_init(void *);
61 static void null_reinit(void *ctx, const uint8_t *buf, u_int len);
62 static int null_update(void *, const void *, u_int);
63 static void null_final(uint8_t *, void *);
64
65 /* Encryption instances */
66 const struct enc_xform enc_xform_null = {
67 .type = CRYPTO_NULL_CBC,
68 .name = "NULL",
69 /* NB: blocksize of 4 is to generate a properly aligned ESP header */
70 .blocksize = NULL_BLOCK_LEN,
71 .ivsize = 0,
72 .minkey = NULL_MIN_KEY,
73 .maxkey = NULL_MAX_KEY,
74 .setkey = null_setkey,
75 .encrypt = null_crypt,
76 .decrypt = null_crypt,
77 .encrypt_multi = null_crypt_multi,
78 .decrypt_multi = null_crypt_multi,
79 };
80
81 /* Authentication instances */
82 const struct auth_hash auth_hash_null = {
83 .type = CRYPTO_NULL_HMAC,
84 .name = "NULL-HMAC",
85 .keysize = 0,
86 .hashsize = NULL_HASH_LEN,
87 .ctxsize = sizeof(int), /* NB: context isn't used */
88 .blocksize = NULL_HMAC_BLOCK_LEN,
89 .Init = null_init,
90 .Setkey = null_reinit,
91 .Reinit = null_reinit,
92 .Update = null_update,
93 .Final = null_final,
94 };
95
96 /*
97 * Encryption wrapper routines.
98 */
99 static void
100 null_crypt(void *key, const uint8_t *in, uint8_t *out)
101 {
102 if (in != out)
103 memcpy(out, in, NULL_BLOCK_LEN);
104 }
105
106 static void
107 null_crypt_multi(void *key, const uint8_t *in, uint8_t *out, size_t len)
108 {
109 if (in != out)
110 memcpy(out, in, len);
111 }
112
113 static int
114 null_setkey(void *sched, const uint8_t *key, int len)
115 {
116 return (0);
117 }
118
119 /*
120 * And now for auth.
121 */
122
123 static void
124 null_init(void *ctx)
125 {
126 }
127
128 static void
129 null_reinit(void *ctx, const uint8_t *buf, u_int len)
130 {
131 }
132
133 static int
134 null_update(void *ctx, const void *buf, u_int len)
135 {
136 return (0);
137 }
138
139 static void
140 null_final(uint8_t *buf, void *ctx)
141 {
142 bzero(buf, NULL_HASH_LEN);
143 }
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