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_skipjack.c 292963 2015-12-30 22:43:07Z allanjude $");
52
53 #include <opencrypto/skipjack.h>
54 #include <opencrypto/xform_enc.h>
55
56 static int skipjack_setkey(u_int8_t **, u_int8_t *, int);
57 static void skipjack_encrypt(caddr_t, u_int8_t *);
58 static void skipjack_decrypt(caddr_t, u_int8_t *);
59 static void skipjack_zerokey(u_int8_t **);
60
61 /* Encryption instances */
62 struct enc_xform enc_xform_skipjack = {
63 CRYPTO_SKIPJACK_CBC, "Skipjack",
64 SKIPJACK_BLOCK_LEN, SKIPJACK_BLOCK_LEN, SKIPJACK_MIN_KEY,
65 SKIPJACK_MAX_KEY,
66 skipjack_encrypt,
67 skipjack_decrypt, skipjack_setkey,
68 skipjack_zerokey,
69 NULL,
70 };
71
72 /*
73 * Encryption wrapper routines.
74 */
75 static void
76 skipjack_encrypt(caddr_t key, u_int8_t *blk)
77 {
78 skipjack_forwards(blk, blk, (u_int8_t **) key);
79 }
80
81 static void
82 skipjack_decrypt(caddr_t key, u_int8_t *blk)
83 {
84 skipjack_backwards(blk, blk, (u_int8_t **) key);
85 }
86
87 static int
88 skipjack_setkey(u_int8_t **sched, u_int8_t *key, int len)
89 {
90 int err;
91
92 /* NB: allocate all the memory that's needed at once */
93 *sched = KMALLOC(10 * (sizeof(u_int8_t *) + 0x100),
94 M_CRYPTO_DATA, M_NOWAIT|M_ZERO);
95 if (*sched != NULL) {
96 u_int8_t** key_tables = (u_int8_t**) *sched;
97 u_int8_t* table = (u_int8_t*) &key_tables[10];
98 int k;
99
100 for (k = 0; k < 10; k++) {
101 key_tables[k] = table;
102 table += 0x100;
103 }
104 subkey_table_gen(key, (u_int8_t **) *sched);
105 err = 0;
106 } else
107 err = ENOMEM;
108 return err;
109 }
110
111 static void
112 skipjack_zerokey(u_int8_t **sched)
113 {
114 bzero(*sched, 10 * (sizeof(u_int8_t *) + 0x100));
115 KFREE(*sched, M_CRYPTO_DATA);
116 *sched = NULL;
117 }
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