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/types.h>
51 #include <crypto/camellia/camellia.h>
52 #include <opencrypto/xform_enc.h>
53
54 struct camellia_cbc_ctx {
55 camellia_ctx state;
56 char iv[CAMELLIA_BLOCK_LEN];
57 };
58
59 static int cml_setkey(void *, const uint8_t *, int);
60 static void cml_encrypt(void *, const uint8_t *, uint8_t *);
61 static void cml_decrypt(void *, const uint8_t *, uint8_t *);
62 static void cml_encrypt_multi(void *, const uint8_t *, uint8_t *, size_t);
63 static void cml_decrypt_multi(void *, const uint8_t *, uint8_t *, size_t);
64 static void cml_reinit(void *, const uint8_t *, size_t);
65
66 /* Encryption instances */
67 const struct enc_xform enc_xform_camellia = {
68 .type = CRYPTO_CAMELLIA_CBC,
69 .name = "Camellia-CBC",
70 .ctxsize = sizeof(struct camellia_cbc_ctx),
71 .blocksize = CAMELLIA_BLOCK_LEN,
72 .ivsize = CAMELLIA_BLOCK_LEN,
73 .minkey = CAMELLIA_MIN_KEY,
74 .maxkey = CAMELLIA_MAX_KEY,
75 .setkey = cml_setkey,
76 .reinit = cml_reinit,
77 .encrypt = cml_encrypt,
78 .decrypt = cml_decrypt,
79 .encrypt_multi = cml_encrypt_multi,
80 .decrypt_multi = cml_decrypt_multi,
81 };
82
83 /*
84 * Encryption wrapper routines.
85 */
86 static void
cml_encrypt(void * vctx,const uint8_t * in,uint8_t * out)87 cml_encrypt(void *vctx, const uint8_t *in, uint8_t *out)
88 {
89 struct camellia_cbc_ctx *ctx = vctx;
90
91 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
92 out[i] = in[i] ^ ctx->iv[i];
93 camellia_encrypt(&ctx->state, out, out);
94 memcpy(ctx->iv, out, CAMELLIA_BLOCK_LEN);
95 }
96
97 static void
cml_decrypt(void * vctx,const uint8_t * in,uint8_t * out)98 cml_decrypt(void *vctx, const uint8_t *in, uint8_t *out)
99 {
100 struct camellia_cbc_ctx *ctx = vctx;
101 char block[CAMELLIA_BLOCK_LEN];
102
103 memcpy(block, in, CAMELLIA_BLOCK_LEN);
104 camellia_decrypt(&ctx->state, in, out);
105 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
106 out[i] ^= ctx->iv[i];
107 memcpy(ctx->iv, block, CAMELLIA_BLOCK_LEN);
108 explicit_bzero(block, sizeof(block));
109 }
110
111 static void
cml_encrypt_multi(void * vctx,const uint8_t * in,uint8_t * out,size_t len)112 cml_encrypt_multi(void *vctx, const uint8_t *in, uint8_t *out, size_t len)
113 {
114 struct camellia_cbc_ctx *ctx = vctx;
115
116 KASSERT(len % CAMELLIA_BLOCK_LEN == 0, ("%s: invalid length",
117 __func__));
118 while (len > 0) {
119 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
120 out[i] = in[i] ^ ctx->iv[i];
121 camellia_encrypt(&ctx->state, out, out);
122 memcpy(ctx->iv, out, CAMELLIA_BLOCK_LEN);
123 out += CAMELLIA_BLOCK_LEN;
124 in += CAMELLIA_BLOCK_LEN;
125 len -= CAMELLIA_BLOCK_LEN;
126 }
127 }
128
129 static void
cml_decrypt_multi(void * vctx,const uint8_t * in,uint8_t * out,size_t len)130 cml_decrypt_multi(void *vctx, const uint8_t *in, uint8_t *out, size_t len)
131 {
132 struct camellia_cbc_ctx *ctx = vctx;
133 char block[CAMELLIA_BLOCK_LEN];
134
135 KASSERT(len % CAMELLIA_BLOCK_LEN == 0, ("%s: invalid length",
136 __func__));
137 while (len > 0) {
138 memcpy(block, in, CAMELLIA_BLOCK_LEN);
139 camellia_decrypt(&ctx->state, in, out);
140 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
141 out[i] ^= ctx->iv[i];
142 memcpy(ctx->iv, block, CAMELLIA_BLOCK_LEN);
143 out += CAMELLIA_BLOCK_LEN;
144 in += CAMELLIA_BLOCK_LEN;
145 len -= CAMELLIA_BLOCK_LEN;
146 }
147 explicit_bzero(block, sizeof(block));
148 }
149
150 static int
cml_setkey(void * vctx,const uint8_t * key,int len)151 cml_setkey(void *vctx, const uint8_t *key, int len)
152 {
153 struct camellia_cbc_ctx *ctx = vctx;
154
155 if (len != 16 && len != 24 && len != 32)
156 return (EINVAL);
157
158 camellia_set_key(&ctx->state, key, len * 8);
159 return (0);
160 }
161
162 static void
cml_reinit(void * vctx,const uint8_t * iv,size_t iv_len)163 cml_reinit(void *vctx, const uint8_t *iv, size_t iv_len)
164 {
165 struct camellia_cbc_ctx *ctx = vctx;
166
167 KASSERT(iv_len == sizeof(ctx->iv), ("%s: bad IV length", __func__));
168 memcpy(ctx->iv, iv, sizeof(ctx->iv));
169 }
170