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/11.2/sys/opencrypto/xform_aes_icm.c 303849 2016-08-08 19:43:07Z bdrewery $");
52
53 #include <opencrypto/xform_enc.h>
54
55 static int aes_icm_setkey(u_int8_t **, u_int8_t *, int);
56 static void aes_icm_crypt(caddr_t, u_int8_t *);
57 static void aes_icm_zerokey(u_int8_t **);
58 static void aes_icm_reinit(caddr_t, u_int8_t *);
59 static void aes_gcm_reinit(caddr_t, u_int8_t *);
60
61 /* Encryption instances */
62 struct enc_xform enc_xform_aes_icm = {
63 CRYPTO_AES_ICM, "AES-ICM",
64 AES_BLOCK_LEN, AES_BLOCK_LEN, AES_MIN_KEY, AES_MAX_KEY,
65 aes_icm_crypt,
66 aes_icm_crypt,
67 aes_icm_setkey,
68 aes_icm_zerokey,
69 aes_icm_reinit,
70 };
71
72 struct enc_xform enc_xform_aes_nist_gcm = {
73 CRYPTO_AES_NIST_GCM_16, "AES-GCM",
74 AES_ICM_BLOCK_LEN, AES_GCM_IV_LEN, AES_MIN_KEY, AES_MAX_KEY,
75 aes_icm_crypt,
76 aes_icm_crypt,
77 aes_icm_setkey,
78 aes_icm_zerokey,
79 aes_gcm_reinit,
80 };
81
82 /*
83 * Encryption wrapper routines.
84 */
85 static void
86 aes_icm_reinit(caddr_t key, u_int8_t *iv)
87 {
88 struct aes_icm_ctx *ctx;
89
90 ctx = (struct aes_icm_ctx *)key;
91 bcopy(iv, ctx->ac_block, AESICM_BLOCKSIZE);
92 }
93
94 static void
95 aes_gcm_reinit(caddr_t key, u_int8_t *iv)
96 {
97 struct aes_icm_ctx *ctx;
98
99 aes_icm_reinit(key, iv);
100
101 ctx = (struct aes_icm_ctx *)key;
102 /* GCM starts with 2 as counter 1 is used for final xor of tag. */
103 bzero(&ctx->ac_block[AESICM_BLOCKSIZE - 4], 4);
104 ctx->ac_block[AESICM_BLOCKSIZE - 1] = 2;
105 }
106
107 static void
108 aes_icm_crypt(caddr_t key, u_int8_t *data)
109 {
110 struct aes_icm_ctx *ctx;
111 u_int8_t keystream[AESICM_BLOCKSIZE];
112 int i;
113
114 ctx = (struct aes_icm_ctx *)key;
115 rijndaelEncrypt(ctx->ac_ek, ctx->ac_nr, ctx->ac_block, keystream);
116 for (i = 0; i < AESICM_BLOCKSIZE; i++)
117 data[i] ^= keystream[i];
118 explicit_bzero(keystream, sizeof(keystream));
119
120 /* increment counter */
121 for (i = AESICM_BLOCKSIZE - 1;
122 i >= 0; i--)
123 if (++ctx->ac_block[i]) /* continue on overflow */
124 break;
125 }
126
127 static int
128 aes_icm_setkey(u_int8_t **sched, u_int8_t *key, int len)
129 {
130 struct aes_icm_ctx *ctx;
131
132 if (len != 16 && len != 24 && len != 32)
133 return EINVAL;
134
135 *sched = KMALLOC(sizeof(struct aes_icm_ctx), M_CRYPTO_DATA,
136 M_NOWAIT | M_ZERO);
137 if (*sched == NULL)
138 return ENOMEM;
139
140 ctx = (struct aes_icm_ctx *)*sched;
141 ctx->ac_nr = rijndaelKeySetupEnc(ctx->ac_ek, (u_char *)key, len * 8);
142 return 0;
143 }
144
145 static void
146 aes_icm_zerokey(u_int8_t **sched)
147 {
148
149 bzero(*sched, sizeof(struct aes_icm_ctx));
150 KFREE(*sched, M_CRYPTO_DATA);
151 *sched = NULL;
152 }
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