blob: 5e005c4f0221589ddf19e3cd40def39f7ac3a22f [file] [log] [blame]
Kevin Coffman76cb9522008-03-24 21:26:16 +08001/*
2 * CTS: Cipher Text Stealing mode
3 *
4 * COPYRIGHT (c) 2008
5 * The Regents of the University of Michigan
6 * ALL RIGHTS RESERVED
7 *
8 * Permission is granted to use, copy, create derivative works
9 * and redistribute this software and such derivative works
10 * for any purpose, so long as the name of The University of
11 * Michigan is not used in any advertising or publicity
12 * pertaining to the use of distribution of this software
13 * without specific, written prior authorization. If the
14 * above copyright notice or any other identification of the
15 * University of Michigan is included in any copy of any
16 * portion of this software, then the disclaimer below must
17 * also be included.
18 *
19 * THIS SOFTWARE IS PROVIDED AS IS, WITHOUT REPRESENTATION
20 * FROM THE UNIVERSITY OF MICHIGAN AS TO ITS FITNESS FOR ANY
21 * PURPOSE, AND WITHOUT WARRANTY BY THE UNIVERSITY OF
22 * MICHIGAN OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING
23 * WITHOUT LIMITATION THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
25 * REGENTS OF THE UNIVERSITY OF MICHIGAN SHALL NOT BE LIABLE
26 * FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR
27 * CONSEQUENTIAL DAMAGES, WITH RESPECT TO ANY CLAIM ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OF THE SOFTWARE, EVEN
29 * IF IT HAS BEEN OR IS HEREAFTER ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGES.
31 */
32
33/* Derived from various:
34 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
35 */
36
37/*
38 * This is the Cipher Text Stealing mode as described by
39 * Section 8 of rfc2040 and referenced by rfc3962.
40 * rfc3962 includes errata information in its Appendix A.
41 */
42
Salvatore Mesoraca6650c4d2018-04-09 15:54:47 +020043#include <crypto/algapi.h>
Herbert Xu0605c412016-07-12 13:17:48 +080044#include <crypto/internal/skcipher.h>
Kevin Coffman76cb9522008-03-24 21:26:16 +080045#include <linux/err.h>
46#include <linux/init.h>
47#include <linux/kernel.h>
48#include <linux/log2.h>
49#include <linux/module.h>
50#include <linux/scatterlist.h>
51#include <crypto/scatterwalk.h>
52#include <linux/slab.h>
Gideon Israel Dsouzad8c34b92016-12-31 21:26:23 +053053#include <linux/compiler.h>
Kevin Coffman76cb9522008-03-24 21:26:16 +080054
55struct crypto_cts_ctx {
Herbert Xu0605c412016-07-12 13:17:48 +080056 struct crypto_skcipher *child;
Kevin Coffman76cb9522008-03-24 21:26:16 +080057};
58
Herbert Xu0605c412016-07-12 13:17:48 +080059struct crypto_cts_reqctx {
60 struct scatterlist sg[2];
61 unsigned offset;
62 struct skcipher_request subreq;
63};
64
65static inline u8 *crypto_cts_reqctx_space(struct skcipher_request *req)
66{
67 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
68 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
69 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
70 struct crypto_skcipher *child = ctx->child;
71
72 return PTR_ALIGN((u8 *)(rctx + 1) + crypto_skcipher_reqsize(child),
73 crypto_skcipher_alignmask(tfm) + 1);
74}
75
76static int crypto_cts_setkey(struct crypto_skcipher *parent, const u8 *key,
Kevin Coffman76cb9522008-03-24 21:26:16 +080077 unsigned int keylen)
78{
Herbert Xu0605c412016-07-12 13:17:48 +080079 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(parent);
80 struct crypto_skcipher *child = ctx->child;
Kevin Coffman76cb9522008-03-24 21:26:16 +080081
Herbert Xu0605c412016-07-12 13:17:48 +080082 crypto_skcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
83 crypto_skcipher_set_flags(child, crypto_skcipher_get_flags(parent) &
84 CRYPTO_TFM_REQ_MASK);
Eric Biggersaf5034e2019-12-30 21:19:38 -060085 return crypto_skcipher_setkey(child, key, keylen);
Kevin Coffman76cb9522008-03-24 21:26:16 +080086}
87
Herbert Xu0605c412016-07-12 13:17:48 +080088static void cts_cbc_crypt_done(struct crypto_async_request *areq, int err)
Kevin Coffman76cb9522008-03-24 21:26:16 +080089{
Herbert Xu0605c412016-07-12 13:17:48 +080090 struct skcipher_request *req = areq->data;
Kevin Coffman76cb9522008-03-24 21:26:16 +080091
Herbert Xu0605c412016-07-12 13:17:48 +080092 if (err == -EINPROGRESS)
93 return;
Kevin Coffman76cb9522008-03-24 21:26:16 +080094
Herbert Xu0605c412016-07-12 13:17:48 +080095 skcipher_request_complete(req, err);
Kevin Coffman76cb9522008-03-24 21:26:16 +080096}
97
Herbert Xu0605c412016-07-12 13:17:48 +080098static int cts_cbc_encrypt(struct skcipher_request *req)
Kevin Coffman76cb9522008-03-24 21:26:16 +080099{
Herbert Xu0605c412016-07-12 13:17:48 +0800100 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
101 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
102 struct skcipher_request *subreq = &rctx->subreq;
103 int bsize = crypto_skcipher_blocksize(tfm);
Salvatore Mesoraca6650c4d2018-04-09 15:54:47 +0200104 u8 d[MAX_CIPHER_BLOCKSIZE * 2] __aligned(__alignof__(u32));
Herbert Xu0605c412016-07-12 13:17:48 +0800105 struct scatterlist *sg;
106 unsigned int offset;
107 int lastn;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800108
Herbert Xu0605c412016-07-12 13:17:48 +0800109 offset = rctx->offset;
110 lastn = req->cryptlen - offset;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800111
Herbert Xu0605c412016-07-12 13:17:48 +0800112 sg = scatterwalk_ffwd(rctx->sg, req->dst, offset - bsize);
113 scatterwalk_map_and_copy(d + bsize, sg, 0, bsize, 0);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800114
Herbert Xu0605c412016-07-12 13:17:48 +0800115 memset(d, 0, bsize);
116 scatterwalk_map_and_copy(d, req->src, offset, lastn, 0);
117
118 scatterwalk_map_and_copy(d, sg, 0, bsize + lastn, 1);
119 memzero_explicit(d, sizeof(d));
120
121 skcipher_request_set_callback(subreq, req->base.flags &
122 CRYPTO_TFM_REQ_MAY_BACKLOG,
123 cts_cbc_crypt_done, req);
124 skcipher_request_set_crypt(subreq, sg, sg, bsize, req->iv);
125 return crypto_skcipher_encrypt(subreq);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800126}
127
Herbert Xu0605c412016-07-12 13:17:48 +0800128static void crypto_cts_encrypt_done(struct crypto_async_request *areq, int err)
Kevin Coffman76cb9522008-03-24 21:26:16 +0800129{
Herbert Xu0605c412016-07-12 13:17:48 +0800130 struct skcipher_request *req = areq->data;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800131
Kevin Coffman76cb9522008-03-24 21:26:16 +0800132 if (err)
Herbert Xu0605c412016-07-12 13:17:48 +0800133 goto out;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800134
Herbert Xu0605c412016-07-12 13:17:48 +0800135 err = cts_cbc_encrypt(req);
Gilad Ben-Yossef4e5b0ad2017-10-18 08:00:36 +0100136 if (err == -EINPROGRESS || err == -EBUSY)
Herbert Xu0605c412016-07-12 13:17:48 +0800137 return;
Daniel Borkmann7185ad22014-09-07 23:23:38 +0200138
Herbert Xu0605c412016-07-12 13:17:48 +0800139out:
140 skcipher_request_complete(req, err);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800141}
142
Herbert Xu0605c412016-07-12 13:17:48 +0800143static int crypto_cts_encrypt(struct skcipher_request *req)
Kevin Coffman76cb9522008-03-24 21:26:16 +0800144{
Herbert Xu0605c412016-07-12 13:17:48 +0800145 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
146 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
147 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
148 struct skcipher_request *subreq = &rctx->subreq;
149 int bsize = crypto_skcipher_blocksize(tfm);
150 unsigned int nbytes = req->cryptlen;
Herbert Xu0605c412016-07-12 13:17:48 +0800151 unsigned int offset;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800152
Herbert Xu0605c412016-07-12 13:17:48 +0800153 skcipher_request_set_tfm(subreq, ctx->child);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800154
Eric Biggersc31a8712019-03-31 13:04:20 -0700155 if (nbytes < bsize)
156 return -EINVAL;
157
158 if (nbytes == bsize) {
Herbert Xu0605c412016-07-12 13:17:48 +0800159 skcipher_request_set_callback(subreq, req->base.flags,
160 req->base.complete,
161 req->base.data);
162 skcipher_request_set_crypt(subreq, req->src, req->dst, nbytes,
163 req->iv);
164 return crypto_skcipher_encrypt(subreq);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800165 }
Herbert Xu0605c412016-07-12 13:17:48 +0800166
Eric Biggersc31a8712019-03-31 13:04:20 -0700167 offset = rounddown(nbytes - 1, bsize);
Herbert Xu0605c412016-07-12 13:17:48 +0800168 rctx->offset = offset;
169
170 skcipher_request_set_callback(subreq, req->base.flags,
171 crypto_cts_encrypt_done, req);
172 skcipher_request_set_crypt(subreq, req->src, req->dst,
173 offset, req->iv);
174
175 return crypto_skcipher_encrypt(subreq) ?:
176 cts_cbc_encrypt(req);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800177}
178
Herbert Xu0605c412016-07-12 13:17:48 +0800179static int cts_cbc_decrypt(struct skcipher_request *req)
Kevin Coffman76cb9522008-03-24 21:26:16 +0800180{
Herbert Xu0605c412016-07-12 13:17:48 +0800181 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
182 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
183 struct skcipher_request *subreq = &rctx->subreq;
184 int bsize = crypto_skcipher_blocksize(tfm);
Salvatore Mesoraca6650c4d2018-04-09 15:54:47 +0200185 u8 d[MAX_CIPHER_BLOCKSIZE * 2] __aligned(__alignof__(u32));
Herbert Xu0605c412016-07-12 13:17:48 +0800186 struct scatterlist *sg;
187 unsigned int offset;
188 u8 *space;
189 int lastn;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800190
Herbert Xu0605c412016-07-12 13:17:48 +0800191 offset = rctx->offset;
192 lastn = req->cryptlen - offset;
193
194 sg = scatterwalk_ffwd(rctx->sg, req->dst, offset - bsize);
195
196 /* 1. Decrypt Cn-1 (s) to create Dn */
197 scatterwalk_map_and_copy(d + bsize, sg, 0, bsize, 0);
198 space = crypto_cts_reqctx_space(req);
199 crypto_xor(d + bsize, space, bsize);
200 /* 2. Pad Cn with zeros at the end to create C of length BB */
201 memset(d, 0, bsize);
202 scatterwalk_map_and_copy(d, req->src, offset, lastn, 0);
203 /* 3. Exclusive-or Dn with C to create Xn */
204 /* 4. Select the first Ln bytes of Xn to create Pn */
205 crypto_xor(d + bsize, d, lastn);
206
207 /* 5. Append the tail (BB - Ln) bytes of Xn to Cn to create En */
208 memcpy(d + lastn, d + bsize + lastn, bsize - lastn);
209 /* 6. Decrypt En to create Pn-1 */
210
211 scatterwalk_map_and_copy(d, sg, 0, bsize + lastn, 1);
212 memzero_explicit(d, sizeof(d));
213
214 skcipher_request_set_callback(subreq, req->base.flags &
215 CRYPTO_TFM_REQ_MAY_BACKLOG,
216 cts_cbc_crypt_done, req);
217
218 skcipher_request_set_crypt(subreq, sg, sg, bsize, space);
219 return crypto_skcipher_decrypt(subreq);
220}
221
222static void crypto_cts_decrypt_done(struct crypto_async_request *areq, int err)
223{
224 struct skcipher_request *req = areq->data;
225
226 if (err)
227 goto out;
228
229 err = cts_cbc_decrypt(req);
Gilad Ben-Yossef4e5b0ad2017-10-18 08:00:36 +0100230 if (err == -EINPROGRESS || err == -EBUSY)
Herbert Xu0605c412016-07-12 13:17:48 +0800231 return;
232
233out:
234 skcipher_request_complete(req, err);
235}
236
237static int crypto_cts_decrypt(struct skcipher_request *req)
238{
239 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
240 struct crypto_cts_reqctx *rctx = skcipher_request_ctx(req);
241 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
242 struct skcipher_request *subreq = &rctx->subreq;
243 int bsize = crypto_skcipher_blocksize(tfm);
244 unsigned int nbytes = req->cryptlen;
Herbert Xu0605c412016-07-12 13:17:48 +0800245 unsigned int offset;
246 u8 *space;
247
248 skcipher_request_set_tfm(subreq, ctx->child);
249
Eric Biggersc31a8712019-03-31 13:04:20 -0700250 if (nbytes < bsize)
251 return -EINVAL;
252
253 if (nbytes == bsize) {
Herbert Xu0605c412016-07-12 13:17:48 +0800254 skcipher_request_set_callback(subreq, req->base.flags,
255 req->base.complete,
256 req->base.data);
257 skcipher_request_set_crypt(subreq, req->src, req->dst, nbytes,
258 req->iv);
259 return crypto_skcipher_decrypt(subreq);
260 }
261
262 skcipher_request_set_callback(subreq, req->base.flags,
263 crypto_cts_decrypt_done, req);
264
265 space = crypto_cts_reqctx_space(req);
266
Eric Biggersc31a8712019-03-31 13:04:20 -0700267 offset = rounddown(nbytes - 1, bsize);
Herbert Xu0605c412016-07-12 13:17:48 +0800268 rctx->offset = offset;
269
Eric Biggersc31a8712019-03-31 13:04:20 -0700270 if (offset <= bsize)
Herbert Xu0605c412016-07-12 13:17:48 +0800271 memcpy(space, req->iv, bsize);
272 else
273 scatterwalk_map_and_copy(space, req->src, offset - 2 * bsize,
274 bsize, 0);
275
276 skcipher_request_set_crypt(subreq, req->src, req->dst,
277 offset, req->iv);
278
279 return crypto_skcipher_decrypt(subreq) ?:
280 cts_cbc_decrypt(req);
281}
282
283static int crypto_cts_init_tfm(struct crypto_skcipher *tfm)
284{
285 struct skcipher_instance *inst = skcipher_alg_instance(tfm);
286 struct crypto_skcipher_spawn *spawn = skcipher_instance_ctx(inst);
287 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
288 struct crypto_skcipher *cipher;
289 unsigned reqsize;
290 unsigned bsize;
291 unsigned align;
292
Eric Biggers60425a82016-10-28 09:52:19 -0700293 cipher = crypto_spawn_skcipher(spawn);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800294 if (IS_ERR(cipher))
295 return PTR_ERR(cipher);
296
297 ctx->child = cipher;
Herbert Xu0605c412016-07-12 13:17:48 +0800298
299 align = crypto_skcipher_alignmask(tfm);
300 bsize = crypto_skcipher_blocksize(cipher);
301 reqsize = ALIGN(sizeof(struct crypto_cts_reqctx) +
302 crypto_skcipher_reqsize(cipher),
303 crypto_tfm_ctx_alignment()) +
304 (align & ~(crypto_tfm_ctx_alignment() - 1)) + bsize;
305
306 crypto_skcipher_set_reqsize(tfm, reqsize);
307
Kevin Coffman76cb9522008-03-24 21:26:16 +0800308 return 0;
309}
310
Herbert Xu0605c412016-07-12 13:17:48 +0800311static void crypto_cts_exit_tfm(struct crypto_skcipher *tfm)
Kevin Coffman76cb9522008-03-24 21:26:16 +0800312{
Herbert Xu0605c412016-07-12 13:17:48 +0800313 struct crypto_cts_ctx *ctx = crypto_skcipher_ctx(tfm);
314
315 crypto_free_skcipher(ctx->child);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800316}
317
Herbert Xu0605c412016-07-12 13:17:48 +0800318static void crypto_cts_free(struct skcipher_instance *inst)
Kevin Coffman76cb9522008-03-24 21:26:16 +0800319{
Herbert Xu0605c412016-07-12 13:17:48 +0800320 crypto_drop_skcipher(skcipher_instance_ctx(inst));
321 kfree(inst);
322}
323
324static int crypto_cts_create(struct crypto_template *tmpl, struct rtattr **tb)
325{
326 struct crypto_skcipher_spawn *spawn;
327 struct skcipher_instance *inst;
328 struct crypto_attr_type *algt;
329 struct skcipher_alg *alg;
Eric Biggersb9f76dd2020-01-02 19:58:45 -0800330 u32 mask;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800331 int err;
332
Herbert Xu0605c412016-07-12 13:17:48 +0800333 algt = crypto_get_attr_type(tb);
334 if (IS_ERR(algt))
335 return PTR_ERR(algt);
336
337 if ((algt->type ^ CRYPTO_ALG_TYPE_SKCIPHER) & algt->mask)
338 return -EINVAL;
339
Eric Biggersb9f76dd2020-01-02 19:58:45 -0800340 mask = crypto_requires_sync(algt->type, algt->mask);
341
Herbert Xu0605c412016-07-12 13:17:48 +0800342 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
343 if (!inst)
344 return -ENOMEM;
345
346 spawn = skcipher_instance_ctx(inst);
347
Eric Biggersb9f76dd2020-01-02 19:58:45 -0800348 err = crypto_grab_skcipher(spawn, skcipher_crypto_instance(inst),
Eric Biggers3ff2bab2020-02-25 20:59:17 -0800349 crypto_attr_alg_name(tb[1]), 0, mask);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800350 if (err)
Herbert Xu0605c412016-07-12 13:17:48 +0800351 goto err_free_inst;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800352
Herbert Xu0605c412016-07-12 13:17:48 +0800353 alg = crypto_spawn_skcipher_alg(spawn);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800354
Herbert Xu0605c412016-07-12 13:17:48 +0800355 err = -EINVAL;
356 if (crypto_skcipher_alg_ivsize(alg) != alg->base.cra_blocksize)
Eric Biggers3ff2bab2020-02-25 20:59:17 -0800357 goto err_free_inst;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800358
Herbert Xu0605c412016-07-12 13:17:48 +0800359 if (strncmp(alg->base.cra_name, "cbc(", 4))
Eric Biggers3ff2bab2020-02-25 20:59:17 -0800360 goto err_free_inst;
Herbert Xu988dc012015-01-16 19:38:17 +1100361
Herbert Xu0605c412016-07-12 13:17:48 +0800362 err = crypto_inst_setname(skcipher_crypto_instance(inst), "cts",
363 &alg->base);
364 if (err)
Eric Biggers3ff2bab2020-02-25 20:59:17 -0800365 goto err_free_inst;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800366
Herbert Xu0605c412016-07-12 13:17:48 +0800367 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
368 inst->alg.base.cra_priority = alg->base.cra_priority;
369 inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
370 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800371
Herbert Xu0605c412016-07-12 13:17:48 +0800372 inst->alg.ivsize = alg->base.cra_blocksize;
373 inst->alg.chunksize = crypto_skcipher_alg_chunksize(alg);
374 inst->alg.min_keysize = crypto_skcipher_alg_min_keysize(alg);
375 inst->alg.max_keysize = crypto_skcipher_alg_max_keysize(alg);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800376
Herbert Xu0605c412016-07-12 13:17:48 +0800377 inst->alg.base.cra_ctxsize = sizeof(struct crypto_cts_ctx);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800378
Herbert Xu0605c412016-07-12 13:17:48 +0800379 inst->alg.init = crypto_cts_init_tfm;
380 inst->alg.exit = crypto_cts_exit_tfm;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800381
Herbert Xu0605c412016-07-12 13:17:48 +0800382 inst->alg.setkey = crypto_cts_setkey;
383 inst->alg.encrypt = crypto_cts_encrypt;
384 inst->alg.decrypt = crypto_cts_decrypt;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800385
Herbert Xu0605c412016-07-12 13:17:48 +0800386 inst->free = crypto_cts_free;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800387
Herbert Xu0605c412016-07-12 13:17:48 +0800388 err = skcipher_register_instance(tmpl, inst);
Eric Biggers3ff2bab2020-02-25 20:59:17 -0800389 if (err) {
Herbert Xu0605c412016-07-12 13:17:48 +0800390err_free_inst:
Eric Biggers3ff2bab2020-02-25 20:59:17 -0800391 crypto_cts_free(inst);
392 }
393 return err;
Kevin Coffman76cb9522008-03-24 21:26:16 +0800394}
395
396static struct crypto_template crypto_cts_tmpl = {
397 .name = "cts",
Herbert Xu0605c412016-07-12 13:17:48 +0800398 .create = crypto_cts_create,
Kevin Coffman76cb9522008-03-24 21:26:16 +0800399 .module = THIS_MODULE,
400};
401
402static int __init crypto_cts_module_init(void)
403{
404 return crypto_register_template(&crypto_cts_tmpl);
405}
406
407static void __exit crypto_cts_module_exit(void)
408{
409 crypto_unregister_template(&crypto_cts_tmpl);
410}
411
Eric Biggersc4741b22019-04-11 21:57:42 -0700412subsys_initcall(crypto_cts_module_init);
Kevin Coffman76cb9522008-03-24 21:26:16 +0800413module_exit(crypto_cts_module_exit);
414
415MODULE_LICENSE("Dual BSD/GPL");
416MODULE_DESCRIPTION("CTS-CBC CipherText Stealing for CBC");
Kees Cook4943ba12014-11-24 16:32:38 -0800417MODULE_ALIAS_CRYPTO("cts");