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 ([email protected]),
4 * Angelos D. Keromytis ([email protected]),
5 * Niels Provos ([email protected]) and
6 * Damien Miller ([email protected]).
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 <sys/types.h>
52 #include <crypto/camellia/camellia.h>
53 #include <opencrypto/xform_enc.h>
54
55 struct camellia_cbc_ctx {
56 camellia_ctx state;
57 char iv[CAMELLIA_BLOCK_LEN];
58 };
59
60 static int cml_setkey(void *, const uint8_t *, int);
61 static void cml_encrypt(void *, const uint8_t *, uint8_t *);
62 static void cml_decrypt(void *, const uint8_t *, uint8_t *);
63 static void cml_encrypt_multi(void *, const uint8_t *, uint8_t *, size_t);
64 static void cml_decrypt_multi(void *, const uint8_t *, uint8_t *, size_t);
65 static void cml_reinit(void *, const uint8_t *, size_t);
66
67 /* Encryption instances */
68 const struct enc_xform enc_xform_camellia = {
69 .type = CRYPTO_CAMELLIA_CBC,
70 .name = "Camellia-CBC",
71 .ctxsize = sizeof(struct camellia_cbc_ctx),
72 .blocksize = CAMELLIA_BLOCK_LEN,
73 .ivsize = CAMELLIA_BLOCK_LEN,
74 .minkey = CAMELLIA_MIN_KEY,
75 .maxkey = CAMELLIA_MAX_KEY,
76 .setkey = cml_setkey,
77 .reinit = cml_reinit,
78 .encrypt = cml_encrypt,
79 .decrypt = cml_decrypt,
80 .encrypt_multi = cml_encrypt_multi,
81 .decrypt_multi = cml_decrypt_multi,
82 };
83
84 /*
85 * Encryption wrapper routines.
86 */
87 static void
cml_encrypt(void * vctx,const uint8_t * in,uint8_t * out)88 cml_encrypt(void *vctx, const uint8_t *in, uint8_t *out)
89 {
90 struct camellia_cbc_ctx *ctx = vctx;
91
92 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
93 out[i] = in[i] ^ ctx->iv[i];
94 camellia_encrypt(&ctx->state, out, out);
95 memcpy(ctx->iv, out, CAMELLIA_BLOCK_LEN);
96 }
97
98 static void
cml_decrypt(void * vctx,const uint8_t * in,uint8_t * out)99 cml_decrypt(void *vctx, const uint8_t *in, uint8_t *out)
100 {
101 struct camellia_cbc_ctx *ctx = vctx;
102 char block[CAMELLIA_BLOCK_LEN];
103
104 memcpy(block, in, CAMELLIA_BLOCK_LEN);
105 camellia_decrypt(&ctx->state, in, out);
106 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
107 out[i] ^= ctx->iv[i];
108 memcpy(ctx->iv, block, CAMELLIA_BLOCK_LEN);
109 explicit_bzero(block, sizeof(block));
110 }
111
112 static void
cml_encrypt_multi(void * vctx,const uint8_t * in,uint8_t * out,size_t len)113 cml_encrypt_multi(void *vctx, const uint8_t *in, uint8_t *out, size_t len)
114 {
115 struct camellia_cbc_ctx *ctx = vctx;
116
117 KASSERT(len % CAMELLIA_BLOCK_LEN == 0, ("%s: invalid length",
118 __func__));
119 while (len > 0) {
120 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
121 out[i] = in[i] ^ ctx->iv[i];
122 camellia_encrypt(&ctx->state, out, out);
123 memcpy(ctx->iv, out, CAMELLIA_BLOCK_LEN);
124 out += CAMELLIA_BLOCK_LEN;
125 in += CAMELLIA_BLOCK_LEN;
126 len -= CAMELLIA_BLOCK_LEN;
127 }
128 }
129
130 static void
cml_decrypt_multi(void * vctx,const uint8_t * in,uint8_t * out,size_t len)131 cml_decrypt_multi(void *vctx, const uint8_t *in, uint8_t *out, size_t len)
132 {
133 struct camellia_cbc_ctx *ctx = vctx;
134 char block[CAMELLIA_BLOCK_LEN];
135
136 KASSERT(len % CAMELLIA_BLOCK_LEN == 0, ("%s: invalid length",
137 __func__));
138 while (len > 0) {
139 memcpy(block, in, CAMELLIA_BLOCK_LEN);
140 camellia_decrypt(&ctx->state, in, out);
141 for (u_int i = 0; i < CAMELLIA_BLOCK_LEN; i++)
142 out[i] ^= ctx->iv[i];
143 memcpy(ctx->iv, block, CAMELLIA_BLOCK_LEN);
144 out += CAMELLIA_BLOCK_LEN;
145 in += CAMELLIA_BLOCK_LEN;
146 len -= CAMELLIA_BLOCK_LEN;
147 }
148 explicit_bzero(block, sizeof(block));
149 }
150
151 static int
cml_setkey(void * vctx,const uint8_t * key,int len)152 cml_setkey(void *vctx, const uint8_t *key, int len)
153 {
154 struct camellia_cbc_ctx *ctx = vctx;
155
156 if (len != 16 && len != 24 && len != 32)
157 return (EINVAL);
158
159 camellia_set_key(&ctx->state, key, len * 8);
160 return (0);
161 }
162
163 static void
cml_reinit(void * vctx,const uint8_t * iv,size_t iv_len)164 cml_reinit(void *vctx, const uint8_t *iv, size_t iv_len)
165 {
166 struct camellia_cbc_ctx *ctx = vctx;
167
168 KASSERT(iv_len == sizeof(ctx->iv), ("%s: bad IV length", __func__));
169 memcpy(ctx->iv, iv, sizeof(ctx->iv));
170 }
171