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/11.0/sys/opencrypto/xform_des3.c 292963 2015-12-30 22:43:07Z allanjude $");
52
53 #include <crypto/des/des.h>
54 #include <opencrypto/xform_enc.h>
55
56 static int des3_setkey(u_int8_t **, u_int8_t *, int);
57 static void des3_encrypt(caddr_t, u_int8_t *);
58 static void des3_decrypt(caddr_t, u_int8_t *);
59 static void des3_zerokey(u_int8_t **);
60
61 /* Encryption instances */
62 struct enc_xform enc_xform_3des = {
63 CRYPTO_3DES_CBC, "3DES",
64 DES3_BLOCK_LEN, DES3_BLOCK_LEN, TRIPLE_DES_MIN_KEY,
65 TRIPLE_DES_MAX_KEY,
66 des3_encrypt,
67 des3_decrypt,
68 des3_setkey,
69 des3_zerokey,
70 NULL,
71 };
72
73 /*
74 * Encryption wrapper routines.
75 */
76 static void
77 des3_encrypt(caddr_t key, u_int8_t *blk)
78 {
79 des_cblock *cb = (des_cblock *) blk;
80 des_key_schedule *p = (des_key_schedule *) key;
81
82 des_ecb3_encrypt(cb, cb, p[0], p[1], p[2], DES_ENCRYPT);
83 }
84
85 static void
86 des3_decrypt(caddr_t key, u_int8_t *blk)
87 {
88 des_cblock *cb = (des_cblock *) blk;
89 des_key_schedule *p = (des_key_schedule *) key;
90
91 des_ecb3_encrypt(cb, cb, p[0], p[1], p[2], DES_DECRYPT);
92 }
93
94 static int
95 des3_setkey(u_int8_t **sched, u_int8_t *key, int len)
96 {
97 des_key_schedule *p;
98 int err;
99
100 p = KMALLOC(3*sizeof (des_key_schedule),
101 M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
102 if (p != NULL) {
103 des_set_key((des_cblock *)(key + 0), p[0]);
104 des_set_key((des_cblock *)(key + 8), p[1]);
105 des_set_key((des_cblock *)(key + 16), p[2]);
106 err = 0;
107 } else
108 err = ENOMEM;
109 *sched = (u_int8_t *) p;
110 return err;
111 }
112
113 static void
114 des3_zerokey(u_int8_t **sched)
115 {
116 bzero(*sched, 3*sizeof (des_key_schedule));
117 KFREE(*sched, M_CRYPTO_DATA);
118 *sched = NULL;
119 }
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