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
54 static int null_setkey(void *, const uint8_t *, int);
55 static void null_crypt(void *, const uint8_t *, uint8_t *);
56 static void null_crypt_multi(void *, const uint8_t *, uint8_t *, size_t);
57
58 static void null_init(void *);
59 static void null_reinit(void *ctx, const uint8_t *buf, u_int len);
60 static int null_update(void *, const void *, u_int);
61 static void null_final(uint8_t *, void *);
62
63 /* Encryption instances */
64 const 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 */
80 const 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 */
97 static void
null_crypt(void * key,const uint8_t * in,uint8_t * out)98 null_crypt(void *key, const uint8_t *in, uint8_t *out)
99 {
100 if (in != out)
101 memcpy(out, in, NULL_BLOCK_LEN);
102 }
103
104 static void
null_crypt_multi(void * key,const uint8_t * in,uint8_t * out,size_t len)105 null_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
111 static int
null_setkey(void * sched,const uint8_t * key,int len)112 null_setkey(void *sched, const uint8_t *key, int len)
113 {
114 return (0);
115 }
116
117 /*
118 * And now for auth.
119 */
120
121 static void
null_init(void * ctx)122 null_init(void *ctx)
123 {
124 }
125
126 static void
null_reinit(void * ctx,const uint8_t * buf,u_int len)127 null_reinit(void *ctx, const uint8_t *buf, u_int len)
128 {
129 }
130
131 static int
null_update(void * ctx,const void * buf,u_int len)132 null_update(void *ctx, const void *buf, u_int len)
133 {
134 return (0);
135 }
136
137 static void
null_final(uint8_t * buf,void * ctx)138 null_final(uint8_t *buf, void *ctx)
139 {
140 bzero(buf, NULL_HASH_LEN);
141 }
142