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("$FreeBSD$");
52
53 #include <opencrypto/cbc_mac.h>
54 #include <opencrypto/gmac.h>
55 #include <opencrypto/xform_enc.h>
56
57 struct aes_gcm_ctx {
58 struct aes_icm_ctx cipher;
59 struct aes_gmac_ctx gmac;
60 };
61
62 struct aes_ccm_ctx {
63 struct aes_icm_ctx cipher;
64 struct aes_cbc_mac_ctx cbc_mac;
65 };
66
67 static int aes_icm_setkey(void *, const uint8_t *, int);
68 static void aes_icm_crypt(void *, const uint8_t *, uint8_t *);
69 static void aes_icm_crypt_multi(void *, const uint8_t *, uint8_t *, size_t);
70 static void aes_icm_crypt_last(void *, const uint8_t *, uint8_t *, size_t);
71 static void aes_icm_reinit(void *, const uint8_t *, size_t);
72 static int aes_gcm_setkey(void *, const uint8_t *, int);
73 static void aes_gcm_reinit(void *, const uint8_t *, size_t);
74 static int aes_gcm_update(void *, const void *, u_int);
75 static void aes_gcm_final(uint8_t *, void *);
76 static int aes_ccm_setkey(void *, const uint8_t *, int);
77 static void aes_ccm_reinit(void *, const uint8_t *, size_t);
78 static int aes_ccm_update(void *, const void *, u_int);
79 static void aes_ccm_final(uint8_t *, void *);
80
81 /* Encryption instances */
82 const struct enc_xform enc_xform_aes_icm = {
83 .type = CRYPTO_AES_ICM,
84 .name = "AES-ICM",
85 .ctxsize = sizeof(struct aes_icm_ctx),
86 .blocksize = 1,
87 .native_blocksize = AES_BLOCK_LEN,
88 .ivsize = AES_BLOCK_LEN,
89 .minkey = AES_MIN_KEY,
90 .maxkey = AES_MAX_KEY,
91 .setkey = aes_icm_setkey,
92 .reinit = aes_icm_reinit,
93 .encrypt = aes_icm_crypt,
94 .decrypt = aes_icm_crypt,
95 .encrypt_multi = aes_icm_crypt_multi,
96 .decrypt_multi = aes_icm_crypt_multi,
97 .encrypt_last = aes_icm_crypt_last,
98 .decrypt_last = aes_icm_crypt_last,
99 };
100
101 const struct enc_xform enc_xform_aes_nist_gcm = {
102 .type = CRYPTO_AES_NIST_GCM_16,
103 .name = "AES-GCM",
104 .ctxsize = sizeof(struct aes_gcm_ctx),
105 .blocksize = 1,
106 .native_blocksize = AES_BLOCK_LEN,
107 .ivsize = AES_GCM_IV_LEN,
108 .minkey = AES_MIN_KEY,
109 .maxkey = AES_MAX_KEY,
110 .macsize = AES_GMAC_HASH_LEN,
111 .setkey = aes_gcm_setkey,
112 .reinit = aes_gcm_reinit,
113 .encrypt = aes_icm_crypt,
114 .decrypt = aes_icm_crypt,
115 .encrypt_multi = aes_icm_crypt_multi,
116 .decrypt_multi = aes_icm_crypt_multi,
117 .encrypt_last = aes_icm_crypt_last,
118 .decrypt_last = aes_icm_crypt_last,
119 .update = aes_gcm_update,
120 .final = aes_gcm_final,
121 };
122
123 const struct enc_xform enc_xform_ccm = {
124 .type = CRYPTO_AES_CCM_16,
125 .name = "AES-CCM",
126 .ctxsize = sizeof(struct aes_ccm_ctx),
127 .blocksize = 1,
128 .native_blocksize = AES_BLOCK_LEN,
129 .ivsize = AES_CCM_IV_LEN,
130 .minkey = AES_MIN_KEY, .maxkey = AES_MAX_KEY,
131 .macsize = AES_CBC_MAC_HASH_LEN,
132 .setkey = aes_ccm_setkey,
133 .reinit = aes_ccm_reinit,
134 .encrypt = aes_icm_crypt,
135 .decrypt = aes_icm_crypt,
136 .encrypt_multi = aes_icm_crypt_multi,
137 .decrypt_multi = aes_icm_crypt_multi,
138 .encrypt_last = aes_icm_crypt_last,
139 .decrypt_last = aes_icm_crypt_last,
140 .update = aes_ccm_update,
141 .final = aes_ccm_final,
142 };
143
144 /*
145 * Encryption wrapper routines.
146 */
147 static void
148 aes_icm_reinit(void *key, const uint8_t *iv, size_t ivlen)
149 {
150 struct aes_icm_ctx *ctx;
151
152 ctx = key;
153 KASSERT(ivlen <= sizeof(ctx->ac_block),
154 ("%s: ivlen too large", __func__));
155 bcopy(iv, ctx->ac_block, ivlen);
156 }
157
158 static void
159 aes_gcm_reinit(void *vctx, const uint8_t *iv, size_t ivlen)
160 {
161 struct aes_gcm_ctx *ctx = vctx;
162
163 KASSERT(ivlen == AES_GCM_IV_LEN,
164 ("%s: invalid IV length", __func__));
165 aes_icm_reinit(&ctx->cipher, iv, ivlen);
166
167 /* GCM starts with 2 as counter 1 is used for final xor of tag. */
168 bzero(&ctx->cipher.ac_block[AESICM_BLOCKSIZE - 4], 4);
169 ctx->cipher.ac_block[AESICM_BLOCKSIZE - 1] = 2;
170
171 AES_GMAC_Reinit(&ctx->gmac, iv, ivlen);
172 }
173
174 static void
175 aes_ccm_reinit(void *vctx, const uint8_t *iv, size_t ivlen)
176 {
177 struct aes_ccm_ctx *ctx = vctx;
178
179 KASSERT(ivlen >= 7 && ivlen <= 13,
180 ("%s: invalid IV length", __func__));
181
182 /* CCM has flags, then the IV, then the counter, which starts at 1 */
183 bzero(ctx->cipher.ac_block, sizeof(ctx->cipher.ac_block));
184 ctx->cipher.ac_block[0] = (15 - ivlen) - 1;
185 bcopy(iv, ctx->cipher.ac_block + 1, ivlen);
186 ctx->cipher.ac_block[AESICM_BLOCKSIZE - 1] = 1;
187
188 AES_CBC_MAC_Reinit(&ctx->cbc_mac, iv, ivlen);
189 }
190
191 static void
192 aes_icm_crypt(void *key, const uint8_t *in, uint8_t *out)
193 {
194 struct aes_icm_ctx *ctx;
195 int i;
196
197 ctx = key;
198 aes_icm_crypt_last(key, in, out, AESICM_BLOCKSIZE);
199
200 /* increment counter */
201 for (i = AESICM_BLOCKSIZE - 1;
202 i >= 0; i--)
203 if (++ctx->ac_block[i]) /* continue on overflow */
204 break;
205 }
206
207 static void
208 aes_icm_crypt_multi(void *key, const uint8_t *in, uint8_t *out, size_t len)
209 {
210 struct aes_icm_ctx *ctx = key;
211 uint8_t keystream[AESICM_BLOCKSIZE];
212 int i;
213
214 KASSERT(len % AESICM_BLOCKSIZE == 0, ("%s: invalid length", __func__));
215 while (len > 0) {
216 rijndaelEncrypt(ctx->ac_ek, ctx->ac_nr, ctx->ac_block, keystream);
217 for (i = 0; i < AESICM_BLOCKSIZE; i++)
218 out[i] = in[i] ^ keystream[i];
219
220 /* increment counter */
221 for (i = AESICM_BLOCKSIZE - 1; i >= 0; i--)
222 if (++ctx->ac_block[i]) /* continue on overflow */
223 break;
224
225 out += AESICM_BLOCKSIZE;
226 in += AESICM_BLOCKSIZE;
227 len -= AESICM_BLOCKSIZE;
228 }
229 explicit_bzero(keystream, sizeof(keystream));
230 }
231
232 static void
233 aes_icm_crypt_last(void *key, const uint8_t *in, uint8_t *out, size_t len)
234 {
235 struct aes_icm_ctx *ctx;
236 uint8_t keystream[AESICM_BLOCKSIZE];
237 int i;
238
239 ctx = key;
240 rijndaelEncrypt(ctx->ac_ek, ctx->ac_nr, ctx->ac_block, keystream);
241 for (i = 0; i < len; i++)
242 out[i] = in[i] ^ keystream[i];
243 explicit_bzero(keystream, sizeof(keystream));
244 }
245
246 static int
247 aes_icm_setkey(void *sched, const uint8_t *key, int len)
248 {
249 struct aes_icm_ctx *ctx;
250
251 if (len != 16 && len != 24 && len != 32)
252 return (EINVAL);
253
254 ctx = sched;
255 ctx->ac_nr = rijndaelKeySetupEnc(ctx->ac_ek, key, len * 8);
256 return (0);
257 }
258
259 static int
260 aes_gcm_setkey(void *vctx, const uint8_t *key, int len)
261 {
262 struct aes_gcm_ctx *ctx = vctx;
263 int error;
264
265 error = aes_icm_setkey(&ctx->cipher, key, len);
266 if (error != 0)
267 return (error);
268
269 AES_GMAC_Setkey(&ctx->gmac, key, len);
270 return (0);
271 }
272
273 static int
274 aes_ccm_setkey(void *vctx, const uint8_t *key, int len)
275 {
276 struct aes_ccm_ctx *ctx = vctx;
277 int error;
278
279 error = aes_icm_setkey(&ctx->cipher, key, len);
280 if (error != 0)
281 return (error);
282
283 AES_CBC_MAC_Setkey(&ctx->cbc_mac, key, len);
284 return (0);
285 }
286
287 static int
288 aes_gcm_update(void *vctx, const void *buf, u_int len)
289 {
290 struct aes_gcm_ctx *ctx = vctx;
291
292 return (AES_GMAC_Update(&ctx->gmac, buf, len));
293 }
294
295 static int
296 aes_ccm_update(void *vctx, const void *buf, u_int len)
297 {
298 struct aes_ccm_ctx *ctx = vctx;
299
300 return (AES_CBC_MAC_Update(&ctx->cbc_mac, buf, len));
301 }
302
303 static void
304 aes_gcm_final(uint8_t *tag, void *vctx)
305 {
306 struct aes_gcm_ctx *ctx = vctx;
307
308 AES_GMAC_Final(tag, &ctx->gmac);
309 }
310
311 static void
312 aes_ccm_final(uint8_t *tag, void *vctx)
313 {
314 struct aes_ccm_ctx *ctx = vctx;
315
316 AES_CBC_MAC_Final(tag, &ctx->cbc_mac);
317 }
Cache object: 9f2813012d70e99c2ecbce11623e7a91
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