Commit | Line | Data |
---|---|---|
0a270321 HX |
1 | /* |
2 | * seqiv: Sequence Number IV Generator | |
3 | * | |
4 | * This generator generates an IV based on a sequence number by xoring it | |
5 | * with a salt. This algorithm is mainly useful for CTR and similar modes. | |
6 | * | |
7 | * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | */ | |
15 | ||
661cfd0e | 16 | #include <crypto/internal/geniv.h> |
0a270321 | 17 | #include <crypto/internal/skcipher.h> |
856e3f40 | 18 | #include <crypto/null.h> |
a0f000ec | 19 | #include <crypto/rng.h> |
856e3f40 | 20 | #include <crypto/scatterwalk.h> |
0a270321 HX |
21 | #include <linux/err.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
0a270321 HX |
26 | #include <linux/spinlock.h> |
27 | #include <linux/string.h> | |
28 | ||
29 | struct seqiv_ctx { | |
30 | spinlock_t lock; | |
31 | u8 salt[] __attribute__ ((aligned(__alignof__(u32)))); | |
32 | }; | |
33 | ||
856e3f40 | 34 | struct seqiv_aead_ctx { |
661cfd0e HX |
35 | /* aead_geniv_ctx must be first the element */ |
36 | struct aead_geniv_ctx geniv; | |
856e3f40 HX |
37 | struct crypto_blkcipher *null; |
38 | u8 salt[] __attribute__ ((aligned(__alignof__(u32)))); | |
39 | }; | |
40 | ||
0677157b HX |
41 | static void seqiv_free(struct crypto_instance *inst); |
42 | ||
0a270321 HX |
43 | static void seqiv_complete2(struct skcipher_givcrypt_request *req, int err) |
44 | { | |
45 | struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req); | |
46 | struct crypto_ablkcipher *geniv; | |
47 | ||
48 | if (err == -EINPROGRESS) | |
49 | return; | |
50 | ||
51 | if (err) | |
52 | goto out; | |
53 | ||
54 | geniv = skcipher_givcrypt_reqtfm(req); | |
55 | memcpy(req->creq.info, subreq->info, crypto_ablkcipher_ivsize(geniv)); | |
56 | ||
57 | out: | |
58 | kfree(subreq->info); | |
59 | } | |
60 | ||
61 | static void seqiv_complete(struct crypto_async_request *base, int err) | |
62 | { | |
63 | struct skcipher_givcrypt_request *req = base->data; | |
64 | ||
65 | seqiv_complete2(req, err); | |
66 | skcipher_givcrypt_complete(req, err); | |
67 | } | |
68 | ||
14df4d80 HX |
69 | static void seqiv_aead_complete2(struct aead_givcrypt_request *req, int err) |
70 | { | |
71 | struct aead_request *subreq = aead_givcrypt_reqctx(req); | |
72 | struct crypto_aead *geniv; | |
73 | ||
74 | if (err == -EINPROGRESS) | |
75 | return; | |
76 | ||
77 | if (err) | |
78 | goto out; | |
79 | ||
80 | geniv = aead_givcrypt_reqtfm(req); | |
81 | memcpy(req->areq.iv, subreq->iv, crypto_aead_ivsize(geniv)); | |
82 | ||
83 | out: | |
84 | kfree(subreq->iv); | |
85 | } | |
86 | ||
87 | static void seqiv_aead_complete(struct crypto_async_request *base, int err) | |
88 | { | |
89 | struct aead_givcrypt_request *req = base->data; | |
90 | ||
91 | seqiv_aead_complete2(req, err); | |
92 | aead_givcrypt_complete(req, err); | |
93 | } | |
94 | ||
856e3f40 HX |
95 | static void seqiv_aead_encrypt_complete2(struct aead_request *req, int err) |
96 | { | |
97 | struct aead_request *subreq = aead_request_ctx(req); | |
98 | struct crypto_aead *geniv; | |
99 | ||
100 | if (err == -EINPROGRESS) | |
101 | return; | |
102 | ||
103 | if (err) | |
104 | goto out; | |
105 | ||
106 | geniv = crypto_aead_reqtfm(req); | |
107 | memcpy(req->iv, subreq->iv, crypto_aead_ivsize(geniv)); | |
108 | ||
109 | out: | |
110 | kzfree(subreq->iv); | |
111 | } | |
112 | ||
113 | static void seqiv_aead_encrypt_complete(struct crypto_async_request *base, | |
114 | int err) | |
115 | { | |
116 | struct aead_request *req = base->data; | |
117 | ||
118 | seqiv_aead_encrypt_complete2(req, err); | |
119 | aead_request_complete(req, err); | |
120 | } | |
121 | ||
14df4d80 HX |
122 | static void seqiv_geniv(struct seqiv_ctx *ctx, u8 *info, u64 seq, |
123 | unsigned int ivsize) | |
124 | { | |
125 | unsigned int len = ivsize; | |
126 | ||
127 | if (ivsize > sizeof(u64)) { | |
128 | memset(info, 0, ivsize - sizeof(u64)); | |
129 | len = sizeof(u64); | |
130 | } | |
131 | seq = cpu_to_be64(seq); | |
132 | memcpy(info + ivsize - len, &seq, len); | |
133 | crypto_xor(info, ctx->salt, ivsize); | |
134 | } | |
135 | ||
0a270321 HX |
136 | static int seqiv_givencrypt(struct skcipher_givcrypt_request *req) |
137 | { | |
138 | struct crypto_ablkcipher *geniv = skcipher_givcrypt_reqtfm(req); | |
139 | struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); | |
140 | struct ablkcipher_request *subreq = skcipher_givcrypt_reqctx(req); | |
3e3dc25f | 141 | crypto_completion_t compl; |
0a270321 HX |
142 | void *data; |
143 | u8 *info; | |
0a270321 | 144 | unsigned int ivsize; |
0a270321 HX |
145 | int err; |
146 | ||
147 | ablkcipher_request_set_tfm(subreq, skcipher_geniv_cipher(geniv)); | |
148 | ||
3e3dc25f | 149 | compl = req->creq.base.complete; |
0a270321 HX |
150 | data = req->creq.base.data; |
151 | info = req->creq.info; | |
152 | ||
153 | ivsize = crypto_ablkcipher_ivsize(geniv); | |
154 | ||
155 | if (unlikely(!IS_ALIGNED((unsigned long)info, | |
156 | crypto_ablkcipher_alignmask(geniv) + 1))) { | |
157 | info = kmalloc(ivsize, req->creq.base.flags & | |
158 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: | |
159 | GFP_ATOMIC); | |
160 | if (!info) | |
161 | return -ENOMEM; | |
162 | ||
3e3dc25f | 163 | compl = seqiv_complete; |
0a270321 HX |
164 | data = req; |
165 | } | |
166 | ||
3e3dc25f | 167 | ablkcipher_request_set_callback(subreq, req->creq.base.flags, compl, |
0a270321 HX |
168 | data); |
169 | ablkcipher_request_set_crypt(subreq, req->creq.src, req->creq.dst, | |
170 | req->creq.nbytes, info); | |
171 | ||
14df4d80 | 172 | seqiv_geniv(ctx, info, req->seq, ivsize); |
0a270321 HX |
173 | memcpy(req->giv, info, ivsize); |
174 | ||
175 | err = crypto_ablkcipher_encrypt(subreq); | |
176 | if (unlikely(info != req->creq.info)) | |
177 | seqiv_complete2(req, err); | |
178 | return err; | |
179 | } | |
180 | ||
14df4d80 HX |
181 | static int seqiv_aead_givencrypt(struct aead_givcrypt_request *req) |
182 | { | |
183 | struct crypto_aead *geniv = aead_givcrypt_reqtfm(req); | |
184 | struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); | |
185 | struct aead_request *areq = &req->areq; | |
186 | struct aead_request *subreq = aead_givcrypt_reqctx(req); | |
3e3dc25f | 187 | crypto_completion_t compl; |
14df4d80 HX |
188 | void *data; |
189 | u8 *info; | |
190 | unsigned int ivsize; | |
191 | int err; | |
192 | ||
193 | aead_request_set_tfm(subreq, aead_geniv_base(geniv)); | |
194 | ||
3e3dc25f | 195 | compl = areq->base.complete; |
14df4d80 HX |
196 | data = areq->base.data; |
197 | info = areq->iv; | |
198 | ||
199 | ivsize = crypto_aead_ivsize(geniv); | |
200 | ||
201 | if (unlikely(!IS_ALIGNED((unsigned long)info, | |
202 | crypto_aead_alignmask(geniv) + 1))) { | |
203 | info = kmalloc(ivsize, areq->base.flags & | |
204 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: | |
205 | GFP_ATOMIC); | |
206 | if (!info) | |
207 | return -ENOMEM; | |
208 | ||
3e3dc25f | 209 | compl = seqiv_aead_complete; |
14df4d80 HX |
210 | data = req; |
211 | } | |
212 | ||
3e3dc25f | 213 | aead_request_set_callback(subreq, areq->base.flags, compl, data); |
14df4d80 HX |
214 | aead_request_set_crypt(subreq, areq->src, areq->dst, areq->cryptlen, |
215 | info); | |
216 | aead_request_set_assoc(subreq, areq->assoc, areq->assoclen); | |
217 | ||
218 | seqiv_geniv(ctx, info, req->seq, ivsize); | |
219 | memcpy(req->giv, info, ivsize); | |
220 | ||
221 | err = crypto_aead_encrypt(subreq); | |
222 | if (unlikely(info != areq->iv)) | |
223 | seqiv_aead_complete2(req, err); | |
224 | return err; | |
225 | } | |
226 | ||
856e3f40 HX |
227 | static int seqiv_aead_encrypt(struct aead_request *req) |
228 | { | |
229 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); | |
230 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
231 | struct aead_request *subreq = aead_request_ctx(req); | |
232 | crypto_completion_t compl; | |
233 | void *data; | |
234 | u8 *info; | |
dd04446e | 235 | unsigned int ivsize = 8; |
856e3f40 HX |
236 | int err; |
237 | ||
dd04446e HX |
238 | if (req->cryptlen < ivsize) |
239 | return -EINVAL; | |
240 | ||
661cfd0e | 241 | aead_request_set_tfm(subreq, ctx->geniv.child); |
856e3f40 HX |
242 | |
243 | compl = req->base.complete; | |
244 | data = req->base.data; | |
245 | info = req->iv; | |
246 | ||
856e3f40 | 247 | if (req->src != req->dst) { |
856e3f40 HX |
248 | struct blkcipher_desc desc = { |
249 | .tfm = ctx->null, | |
250 | }; | |
251 | ||
d0ad1b24 HX |
252 | err = crypto_blkcipher_encrypt(&desc, req->dst, req->src, |
253 | req->assoclen + req->cryptlen); | |
856e3f40 HX |
254 | if (err) |
255 | return err; | |
256 | } | |
257 | ||
258 | if (unlikely(!IS_ALIGNED((unsigned long)info, | |
259 | crypto_aead_alignmask(geniv) + 1))) { | |
260 | info = kmalloc(ivsize, req->base.flags & | |
261 | CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL: | |
262 | GFP_ATOMIC); | |
263 | if (!info) | |
264 | return -ENOMEM; | |
265 | ||
266 | memcpy(info, req->iv, ivsize); | |
267 | compl = seqiv_aead_encrypt_complete; | |
268 | data = req; | |
269 | } | |
270 | ||
271 | aead_request_set_callback(subreq, req->base.flags, compl, data); | |
272 | aead_request_set_crypt(subreq, req->dst, req->dst, | |
273 | req->cryptlen - ivsize, info); | |
374d4ad1 | 274 | aead_request_set_ad(subreq, req->assoclen + ivsize); |
856e3f40 HX |
275 | |
276 | crypto_xor(info, ctx->salt, ivsize); | |
277 | scatterwalk_map_and_copy(info, req->dst, req->assoclen, ivsize, 1); | |
278 | ||
279 | err = crypto_aead_encrypt(subreq); | |
280 | if (unlikely(info != req->iv)) | |
281 | seqiv_aead_encrypt_complete2(req, err); | |
282 | return err; | |
283 | } | |
284 | ||
856e3f40 HX |
285 | static int seqiv_aead_decrypt(struct aead_request *req) |
286 | { | |
287 | struct crypto_aead *geniv = crypto_aead_reqtfm(req); | |
288 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); | |
289 | struct aead_request *subreq = aead_request_ctx(req); | |
290 | crypto_completion_t compl; | |
291 | void *data; | |
dd04446e HX |
292 | unsigned int ivsize = 8; |
293 | ||
294 | if (req->cryptlen < ivsize + crypto_aead_authsize(geniv)) | |
295 | return -EINVAL; | |
856e3f40 | 296 | |
661cfd0e | 297 | aead_request_set_tfm(subreq, ctx->geniv.child); |
856e3f40 HX |
298 | |
299 | compl = req->base.complete; | |
300 | data = req->base.data; | |
301 | ||
856e3f40 HX |
302 | aead_request_set_callback(subreq, req->base.flags, compl, data); |
303 | aead_request_set_crypt(subreq, req->src, req->dst, | |
304 | req->cryptlen - ivsize, req->iv); | |
374d4ad1 | 305 | aead_request_set_ad(subreq, req->assoclen + ivsize); |
856e3f40 HX |
306 | |
307 | scatterwalk_map_and_copy(req->iv, req->src, req->assoclen, ivsize, 0); | |
856e3f40 HX |
308 | |
309 | return crypto_aead_decrypt(subreq); | |
310 | } | |
311 | ||
0a270321 HX |
312 | static int seqiv_init(struct crypto_tfm *tfm) |
313 | { | |
314 | struct crypto_ablkcipher *geniv = __crypto_ablkcipher_cast(tfm); | |
315 | struct seqiv_ctx *ctx = crypto_ablkcipher_ctx(geniv); | |
eeee12aa | 316 | int err; |
0a270321 HX |
317 | |
318 | spin_lock_init(&ctx->lock); | |
319 | ||
320 | tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request); | |
321 | ||
eeee12aa HX |
322 | err = 0; |
323 | if (!crypto_get_default_rng()) { | |
324 | crypto_ablkcipher_crt(geniv)->givencrypt = seqiv_givencrypt; | |
325 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, | |
326 | crypto_ablkcipher_ivsize(geniv)); | |
327 | crypto_put_default_rng(); | |
328 | } | |
329 | ||
330 | return err ?: skcipher_geniv_init(tfm); | |
0a270321 HX |
331 | } |
332 | ||
856e3f40 | 333 | static int seqiv_old_aead_init(struct crypto_tfm *tfm) |
14df4d80 HX |
334 | { |
335 | struct crypto_aead *geniv = __crypto_aead_cast(tfm); | |
336 | struct seqiv_ctx *ctx = crypto_aead_ctx(geniv); | |
eeee12aa | 337 | int err; |
14df4d80 HX |
338 | |
339 | spin_lock_init(&ctx->lock); | |
340 | ||
ba6d8e39 HX |
341 | crypto_aead_set_reqsize(__crypto_aead_cast(tfm), |
342 | sizeof(struct aead_request)); | |
eeee12aa HX |
343 | err = 0; |
344 | if (!crypto_get_default_rng()) { | |
345 | geniv->givencrypt = seqiv_aead_givencrypt; | |
346 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, | |
347 | crypto_aead_ivsize(geniv)); | |
348 | crypto_put_default_rng(); | |
349 | } | |
14df4d80 | 350 | |
eeee12aa | 351 | return err ?: aead_geniv_init(tfm); |
14df4d80 HX |
352 | } |
353 | ||
5964f26c HX |
354 | static int seqiv_aead_init_common(struct crypto_aead *geniv, |
355 | unsigned int reqsize) | |
856e3f40 | 356 | { |
856e3f40 HX |
357 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(geniv); |
358 | int err; | |
359 | ||
661cfd0e | 360 | spin_lock_init(&ctx->geniv.lock); |
856e3f40 HX |
361 | |
362 | crypto_aead_set_reqsize(geniv, sizeof(struct aead_request)); | |
363 | ||
eeee12aa HX |
364 | err = crypto_get_default_rng(); |
365 | if (err) | |
366 | goto out; | |
367 | ||
b7dcfab4 HX |
368 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, |
369 | crypto_aead_ivsize(geniv)); | |
eeee12aa | 370 | crypto_put_default_rng(); |
b7dcfab4 HX |
371 | if (err) |
372 | goto out; | |
373 | ||
856e3f40 HX |
374 | ctx->null = crypto_get_default_null_skcipher(); |
375 | err = PTR_ERR(ctx->null); | |
376 | if (IS_ERR(ctx->null)) | |
377 | goto out; | |
378 | ||
5964f26c | 379 | err = aead_geniv_init(crypto_aead_tfm(geniv)); |
856e3f40 HX |
380 | if (err) |
381 | goto drop_null; | |
382 | ||
661cfd0e | 383 | ctx->geniv.child = geniv->child; |
856e3f40 HX |
384 | geniv->child = geniv; |
385 | ||
386 | out: | |
387 | return err; | |
388 | ||
389 | drop_null: | |
390 | crypto_put_default_null_skcipher(); | |
391 | goto out; | |
392 | } | |
393 | ||
5964f26c | 394 | static int seqiv_aead_init(struct crypto_aead *tfm) |
856e3f40 | 395 | { |
dd04446e HX |
396 | return seqiv_aead_init_common(tfm, sizeof(struct aead_request)); |
397 | } | |
856e3f40 | 398 | |
5964f26c | 399 | static void seqiv_aead_exit(struct crypto_aead *tfm) |
856e3f40 | 400 | { |
5964f26c | 401 | struct seqiv_aead_ctx *ctx = crypto_aead_ctx(tfm); |
856e3f40 | 402 | |
661cfd0e | 403 | crypto_free_aead(ctx->geniv.child); |
856e3f40 HX |
404 | crypto_put_default_null_skcipher(); |
405 | } | |
406 | ||
0677157b HX |
407 | static int seqiv_ablkcipher_create(struct crypto_template *tmpl, |
408 | struct rtattr **tb) | |
0a270321 HX |
409 | { |
410 | struct crypto_instance *inst; | |
0677157b | 411 | int err; |
0a270321 | 412 | |
0677157b | 413 | inst = skcipher_geniv_alloc(tmpl, tb, 0, 0); |
14df4d80 | 414 | |
0a270321 | 415 | if (IS_ERR(inst)) |
0677157b | 416 | return PTR_ERR(inst); |
0a270321 | 417 | |
0677157b HX |
418 | err = -EINVAL; |
419 | if (inst->alg.cra_ablkcipher.ivsize < sizeof(u64)) | |
420 | goto free_inst; | |
c0ecf891 | 421 | |
0a270321 HX |
422 | inst->alg.cra_init = seqiv_init; |
423 | inst->alg.cra_exit = skcipher_geniv_exit; | |
424 | ||
0a270321 | 425 | inst->alg.cra_ctxsize += inst->alg.cra_ablkcipher.ivsize; |
856e3f40 | 426 | inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx); |
0a270321 | 427 | |
0677157b HX |
428 | inst->alg.cra_alignmask |= __alignof__(u32) - 1; |
429 | ||
430 | err = crypto_register_instance(tmpl, inst); | |
431 | if (err) | |
432 | goto free_inst; | |
433 | ||
0a270321 | 434 | out: |
0677157b HX |
435 | return err; |
436 | ||
437 | free_inst: | |
438 | skcipher_geniv_free(inst); | |
439 | goto out; | |
0a270321 HX |
440 | } |
441 | ||
0677157b HX |
442 | static int seqiv_old_aead_create(struct crypto_template *tmpl, |
443 | struct aead_instance *aead) | |
856e3f40 HX |
444 | { |
445 | struct crypto_instance *inst = aead_crypto_instance(aead); | |
0677157b | 446 | int err = -EINVAL; |
856e3f40 | 447 | |
0677157b HX |
448 | if (inst->alg.cra_aead.ivsize < sizeof(u64)) |
449 | goto free_inst; | |
856e3f40 | 450 | |
856e3f40 HX |
451 | inst->alg.cra_init = seqiv_old_aead_init; |
452 | inst->alg.cra_exit = aead_geniv_exit; | |
453 | ||
454 | inst->alg.cra_ctxsize = inst->alg.cra_aead.ivsize; | |
455 | inst->alg.cra_ctxsize += sizeof(struct seqiv_ctx); | |
456 | ||
0677157b HX |
457 | err = crypto_register_instance(tmpl, inst); |
458 | if (err) | |
459 | goto free_inst; | |
460 | ||
461 | out: | |
462 | return err; | |
463 | ||
464 | free_inst: | |
465 | aead_geniv_free(aead); | |
466 | goto out; | |
856e3f40 HX |
467 | } |
468 | ||
0677157b | 469 | static int seqiv_aead_create(struct crypto_template *tmpl, struct rtattr **tb) |
14df4d80 | 470 | { |
856e3f40 HX |
471 | struct aead_instance *inst; |
472 | struct crypto_aead_spawn *spawn; | |
473 | struct aead_alg *alg; | |
0677157b | 474 | int err; |
14df4d80 | 475 | |
0677157b | 476 | inst = aead_geniv_alloc(tmpl, tb, 0, 0); |
14df4d80 HX |
477 | |
478 | if (IS_ERR(inst)) | |
0677157b HX |
479 | return PTR_ERR(inst); |
480 | ||
481 | inst->alg.base.cra_alignmask |= __alignof__(u32) - 1; | |
14df4d80 | 482 | |
856e3f40 | 483 | if (inst->alg.base.cra_aead.encrypt) |
0677157b | 484 | return seqiv_old_aead_create(tmpl, inst); |
856e3f40 | 485 | |
661cfd0e HX |
486 | spawn = aead_instance_ctx(inst); |
487 | alg = crypto_spawn_aead_alg(spawn); | |
488 | ||
489 | if (alg->base.cra_aead.encrypt) | |
490 | goto done; | |
491 | ||
0677157b | 492 | err = -EINVAL; |
dd04446e | 493 | if (inst->alg.ivsize != sizeof(u64)) |
0677157b | 494 | goto free_inst; |
c0ecf891 | 495 | |
b7dcfab4 | 496 | inst->alg.encrypt = seqiv_aead_encrypt; |
856e3f40 | 497 | inst->alg.decrypt = seqiv_aead_decrypt; |
14df4d80 | 498 | |
5964f26c HX |
499 | inst->alg.init = seqiv_aead_init; |
500 | inst->alg.exit = seqiv_aead_exit; | |
856e3f40 HX |
501 | |
502 | inst->alg.base.cra_ctxsize = sizeof(struct seqiv_aead_ctx); | |
5964f26c | 503 | inst->alg.base.cra_ctxsize += inst->alg.ivsize; |
856e3f40 | 504 | |
661cfd0e | 505 | done: |
0677157b HX |
506 | err = aead_register_instance(tmpl, inst); |
507 | if (err) | |
508 | goto free_inst; | |
509 | ||
14df4d80 | 510 | out: |
0677157b HX |
511 | return err; |
512 | ||
513 | free_inst: | |
514 | aead_geniv_free(inst); | |
515 | goto out; | |
14df4d80 HX |
516 | } |
517 | ||
0677157b | 518 | static int seqiv_create(struct crypto_template *tmpl, struct rtattr **tb) |
14df4d80 HX |
519 | { |
520 | struct crypto_attr_type *algt; | |
14df4d80 HX |
521 | int err; |
522 | ||
523 | algt = crypto_get_attr_type(tb); | |
14df4d80 | 524 | if (IS_ERR(algt)) |
0677157b | 525 | return PTR_ERR(algt); |
14df4d80 HX |
526 | |
527 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) | |
0677157b | 528 | err = seqiv_ablkcipher_create(tmpl, tb); |
14df4d80 | 529 | else |
0677157b | 530 | err = seqiv_aead_create(tmpl, tb); |
14df4d80 | 531 | |
0677157b | 532 | return err; |
14df4d80 HX |
533 | } |
534 | ||
535 | static void seqiv_free(struct crypto_instance *inst) | |
536 | { | |
537 | if ((inst->alg.cra_flags ^ CRYPTO_ALG_TYPE_AEAD) & CRYPTO_ALG_TYPE_MASK) | |
538 | skcipher_geniv_free(inst); | |
539 | else | |
856e3f40 | 540 | aead_geniv_free(aead_instance(inst)); |
14df4d80 HX |
541 | } |
542 | ||
0a270321 HX |
543 | static struct crypto_template seqiv_tmpl = { |
544 | .name = "seqiv", | |
0677157b | 545 | .create = seqiv_create, |
14df4d80 | 546 | .free = seqiv_free, |
0a270321 HX |
547 | .module = THIS_MODULE, |
548 | }; | |
549 | ||
550 | static int __init seqiv_module_init(void) | |
551 | { | |
8a2cd1c4 | 552 | return crypto_register_template(&seqiv_tmpl); |
0a270321 HX |
553 | } |
554 | ||
555 | static void __exit seqiv_module_exit(void) | |
556 | { | |
557 | crypto_unregister_template(&seqiv_tmpl); | |
558 | } | |
559 | ||
560 | module_init(seqiv_module_init); | |
561 | module_exit(seqiv_module_exit); | |
562 | ||
563 | MODULE_LICENSE("GPL"); | |
564 | MODULE_DESCRIPTION("Sequence Number IV Generator"); | |
4943ba16 | 565 | MODULE_ALIAS_CRYPTO("seqiv"); |