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13#include <crypto/aead.h>
14#include <crypto/internal/hash.h>
15#include <crypto/internal/skcipher.h>
16#include <crypto/authenc.h>
17#include <crypto/scatterwalk.h>
18#include <linux/err.h>
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/rtnetlink.h>
23#include <linux/slab.h>
24#include <linux/spinlock.h>
25
26typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags);
27
28struct authenc_instance_ctx {
29 struct crypto_ahash_spawn auth;
30 struct crypto_skcipher_spawn enc;
31};
32
33struct crypto_authenc_ctx {
34 unsigned int reqoff;
35 struct crypto_ahash *auth;
36 struct crypto_ablkcipher *enc;
37};
38
39struct authenc_request_ctx {
40 unsigned int cryptlen;
41 struct scatterlist *sg;
42 struct scatterlist asg[2];
43 struct scatterlist cipher[2];
44 crypto_completion_t complete;
45 crypto_completion_t update_complete;
46 char tail[];
47};
48
49static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
50 unsigned int keylen)
51{
52 unsigned int authkeylen;
53 unsigned int enckeylen;
54 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
55 struct crypto_ahash *auth = ctx->auth;
56 struct crypto_ablkcipher *enc = ctx->enc;
57 struct rtattr *rta = (void *)key;
58 struct crypto_authenc_key_param *param;
59 int err = -EINVAL;
60
61 if (!RTA_OK(rta, keylen))
62 goto badkey;
63 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
64 goto badkey;
65 if (RTA_PAYLOAD(rta) < sizeof(*param))
66 goto badkey;
67
68 param = RTA_DATA(rta);
69 enckeylen = be32_to_cpu(param->enckeylen);
70
71 key += RTA_ALIGN(rta->rta_len);
72 keylen -= RTA_ALIGN(rta->rta_len);
73
74 if (keylen < enckeylen)
75 goto badkey;
76
77 authkeylen = keylen - enckeylen;
78
79 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
80 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
81 CRYPTO_TFM_REQ_MASK);
82 err = crypto_ahash_setkey(auth, key, authkeylen);
83 crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
84 CRYPTO_TFM_RES_MASK);
85
86 if (err)
87 goto out;
88
89 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
90 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
91 CRYPTO_TFM_REQ_MASK);
92 err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
93 crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
94 CRYPTO_TFM_RES_MASK);
95
96out:
97 return err;
98
99badkey:
100 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
101 goto out;
102}
103
104static void authenc_chain(struct scatterlist *head, struct scatterlist *sg,
105 int chain)
106{
107 if (chain) {
108 head->length += sg->length;
109 sg = scatterwalk_sg_next(sg);
110 }
111
112 if (sg)
113 scatterwalk_sg_chain(head, 2, sg);
114 else
115 sg_mark_end(head);
116}
117
118static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,
119 int err)
120{
121 struct aead_request *req = areq->data;
122 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
123 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
124 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
125 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
126
127 if (err)
128 goto out;
129
130 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
131 areq_ctx->cryptlen);
132 ahash_request_set_callback(ahreq, aead_request_flags(req) &
133 CRYPTO_TFM_REQ_MAY_SLEEP,
134 areq_ctx->complete, req);
135
136 err = crypto_ahash_finup(ahreq);
137 if (err)
138 goto out;
139
140 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
141 areq_ctx->cryptlen,
142 crypto_aead_authsize(authenc), 1);
143
144out:
145 aead_request_complete(req, err);
146}
147
148static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
149{
150 struct aead_request *req = areq->data;
151 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
152 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
153 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
154 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
155
156 if (err)
157 goto out;
158
159 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
160 areq_ctx->cryptlen,
161 crypto_aead_authsize(authenc), 1);
162
163out:
164 aead_request_complete(req, err);
165}
166
167static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
168 int err)
169{
170 u8 *ihash;
171 unsigned int authsize;
172 struct ablkcipher_request *abreq;
173 struct aead_request *req = areq->data;
174 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
175 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
176 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
177 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
178
179 if (err)
180 goto out;
181
182 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
183 areq_ctx->cryptlen);
184 ahash_request_set_callback(ahreq, aead_request_flags(req) &
185 CRYPTO_TFM_REQ_MAY_SLEEP,
186 areq_ctx->complete, req);
187
188 err = crypto_ahash_finup(ahreq);
189 if (err)
190 goto out;
191
192 authsize = crypto_aead_authsize(authenc);
193 ihash = ahreq->result + authsize;
194 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
195 authsize, 0);
196
197 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG: 0;
198 if (err)
199 goto out;
200
201 abreq = aead_request_ctx(req);
202 ablkcipher_request_set_tfm(abreq, ctx->enc);
203 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
204 req->base.complete, req->base.data);
205 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
206 req->cryptlen, req->iv);
207
208 err = crypto_ablkcipher_decrypt(abreq);
209
210out:
211 aead_request_complete(req, err);
212}
213
214static void authenc_verify_ahash_done(struct crypto_async_request *areq,
215 int err)
216{
217 u8 *ihash;
218 unsigned int authsize;
219 struct ablkcipher_request *abreq;
220 struct aead_request *req = areq->data;
221 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
222 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
223 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
224 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
225
226 if (err)
227 goto out;
228
229 authsize = crypto_aead_authsize(authenc);
230 ihash = ahreq->result + authsize;
231 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
232 authsize, 0);
233
234 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG: 0;
235 if (err)
236 goto out;
237
238 abreq = aead_request_ctx(req);
239 ablkcipher_request_set_tfm(abreq, ctx->enc);
240 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
241 req->base.complete, req->base.data);
242 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
243 req->cryptlen, req->iv);
244
245 err = crypto_ablkcipher_decrypt(abreq);
246
247out:
248 aead_request_complete(req, err);
249}
250
251static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)
252{
253 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
254 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
255 struct crypto_ahash *auth = ctx->auth;
256 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
257 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
258 u8 *hash = areq_ctx->tail;
259 int err;
260
261 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
262 crypto_ahash_alignmask(auth) + 1);
263
264 ahash_request_set_tfm(ahreq, auth);
265
266 err = crypto_ahash_init(ahreq);
267 if (err)
268 return ERR_PTR(err);
269
270 ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);
271 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
272 areq_ctx->update_complete, req);
273
274 err = crypto_ahash_update(ahreq);
275 if (err)
276 return ERR_PTR(err);
277
278 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
279 areq_ctx->cryptlen);
280 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
281 areq_ctx->complete, req);
282
283 err = crypto_ahash_finup(ahreq);
284 if (err)
285 return ERR_PTR(err);
286
287 return hash;
288}
289
290static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)
291{
292 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
293 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
294 struct crypto_ahash *auth = ctx->auth;
295 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
296 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
297 u8 *hash = areq_ctx->tail;
298 int err;
299
300 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
301 crypto_ahash_alignmask(auth) + 1);
302
303 ahash_request_set_tfm(ahreq, auth);
304 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
305 areq_ctx->cryptlen);
306 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
307 areq_ctx->complete, req);
308
309 err = crypto_ahash_digest(ahreq);
310 if (err)
311 return ERR_PTR(err);
312
313 return hash;
314}
315
316static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
317 unsigned int flags)
318{
319 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
320 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
321 struct scatterlist *dst = req->dst;
322 struct scatterlist *assoc = req->assoc;
323 struct scatterlist *cipher = areq_ctx->cipher;
324 struct scatterlist *asg = areq_ctx->asg;
325 unsigned int ivsize = crypto_aead_ivsize(authenc);
326 unsigned int cryptlen = req->cryptlen;
327 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
328 struct page *dstp;
329 u8 *vdst;
330 u8 *hash;
331
332 dstp = sg_page(dst);
333 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
334
335 if (ivsize) {
336 sg_init_table(cipher, 2);
337 sg_set_buf(cipher, iv, ivsize);
338 authenc_chain(cipher, dst, vdst == iv + ivsize);
339 dst = cipher;
340 cryptlen += ivsize;
341 }
342
343 if (sg_is_last(assoc)) {
344 authenc_ahash_fn = crypto_authenc_ahash;
345 sg_init_table(asg, 2);
346 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
347 authenc_chain(asg, dst, 0);
348 dst = asg;
349 cryptlen += req->assoclen;
350 }
351
352 areq_ctx->cryptlen = cryptlen;
353 areq_ctx->sg = dst;
354
355 areq_ctx->complete = authenc_geniv_ahash_done;
356 areq_ctx->update_complete = authenc_geniv_ahash_update_done;
357
358 hash = authenc_ahash_fn(req, flags);
359 if (IS_ERR(hash))
360 return PTR_ERR(hash);
361
362 scatterwalk_map_and_copy(hash, dst, cryptlen,
363 crypto_aead_authsize(authenc), 1);
364 return 0;
365}
366
367static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
368 int err)
369{
370 struct aead_request *areq = req->data;
371
372 if (!err) {
373 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
374 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
375 struct ablkcipher_request *abreq = aead_request_ctx(areq);
376 u8 *iv = (u8 *)(abreq + 1) +
377 crypto_ablkcipher_reqsize(ctx->enc);
378
379 err = crypto_authenc_genicv(areq, iv, 0);
380 }
381
382 aead_request_complete(areq, err);
383}
384
385static int crypto_authenc_encrypt(struct aead_request *req)
386{
387 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
388 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
389 struct ablkcipher_request *abreq = aead_request_ctx(req);
390 struct crypto_ablkcipher *enc = ctx->enc;
391 struct scatterlist *dst = req->dst;
392 unsigned int cryptlen = req->cryptlen;
393 u8 *iv = (u8 *)(abreq + 1) + crypto_ablkcipher_reqsize(enc);
394 int err;
395
396 ablkcipher_request_set_tfm(abreq, enc);
397 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
398 crypto_authenc_encrypt_done, req);
399 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
400
401 memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
402
403 err = crypto_ablkcipher_encrypt(abreq);
404 if (err)
405 return err;
406
407 return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
408}
409
410static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
411 int err)
412{
413 struct aead_request *areq = req->data;
414
415 if (!err) {
416 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
417
418 err = crypto_authenc_genicv(areq, greq->giv, 0);
419 }
420
421 aead_request_complete(areq, err);
422}
423
424static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
425{
426 struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
427 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
428 struct aead_request *areq = &req->areq;
429 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
430 u8 *iv = req->giv;
431 int err;
432
433 skcipher_givcrypt_set_tfm(greq, ctx->enc);
434 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
435 crypto_authenc_givencrypt_done, areq);
436 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
437 areq->iv);
438 skcipher_givcrypt_set_giv(greq, iv, req->seq);
439
440 err = crypto_skcipher_givencrypt(greq);
441 if (err)
442 return err;
443
444 return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
445}
446
447static int crypto_authenc_verify(struct aead_request *req,
448 authenc_ahash_t authenc_ahash_fn)
449{
450 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
451 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
452 u8 *ohash;
453 u8 *ihash;
454 unsigned int authsize;
455
456 areq_ctx->complete = authenc_verify_ahash_done;
457 areq_ctx->complete = authenc_verify_ahash_update_done;
458
459 ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);
460 if (IS_ERR(ohash))
461 return PTR_ERR(ohash);
462
463 authsize = crypto_aead_authsize(authenc);
464 ihash = ohash + authsize;
465 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
466 authsize, 0);
467 return memcmp(ihash, ohash, authsize) ? -EBADMSG: 0;
468}
469
470static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
471 unsigned int cryptlen)
472{
473 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
474 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
475 struct scatterlist *src = req->src;
476 struct scatterlist *assoc = req->assoc;
477 struct scatterlist *cipher = areq_ctx->cipher;
478 struct scatterlist *asg = areq_ctx->asg;
479 unsigned int ivsize = crypto_aead_ivsize(authenc);
480 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
481 struct page *srcp;
482 u8 *vsrc;
483
484 srcp = sg_page(src);
485 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
486
487 if (ivsize) {
488 sg_init_table(cipher, 2);
489 sg_set_buf(cipher, iv, ivsize);
490 authenc_chain(cipher, src, vsrc == iv + ivsize);
491 src = cipher;
492 cryptlen += ivsize;
493 }
494
495 if (sg_is_last(assoc)) {
496 authenc_ahash_fn = crypto_authenc_ahash;
497 sg_init_table(asg, 2);
498 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
499 authenc_chain(asg, src, 0);
500 src = asg;
501 cryptlen += req->assoclen;
502 }
503
504 areq_ctx->cryptlen = cryptlen;
505 areq_ctx->sg = src;
506
507 return crypto_authenc_verify(req, authenc_ahash_fn);
508}
509
510static int crypto_authenc_decrypt(struct aead_request *req)
511{
512 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
513 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
514 struct ablkcipher_request *abreq = aead_request_ctx(req);
515 unsigned int cryptlen = req->cryptlen;
516 unsigned int authsize = crypto_aead_authsize(authenc);
517 u8 *iv = req->iv;
518 int err;
519
520 if (cryptlen < authsize)
521 return -EINVAL;
522 cryptlen -= authsize;
523
524 err = crypto_authenc_iverify(req, iv, cryptlen);
525 if (err)
526 return err;
527
528 ablkcipher_request_set_tfm(abreq, ctx->enc);
529 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
530 req->base.complete, req->base.data);
531 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
532
533 return crypto_ablkcipher_decrypt(abreq);
534}
535
536static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
537{
538 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
539 struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
540 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
541 struct crypto_ahash *auth;
542 struct crypto_ablkcipher *enc;
543 int err;
544
545 auth = crypto_spawn_ahash(&ictx->auth);
546 if (IS_ERR(auth))
547 return PTR_ERR(auth);
548
549 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
550 crypto_ahash_alignmask(auth),
551 crypto_ahash_alignmask(auth) + 1);
552
553 enc = crypto_spawn_skcipher(&ictx->enc);
554 err = PTR_ERR(enc);
555 if (IS_ERR(enc))
556 goto err_free_ahash;
557
558 ctx->auth = auth;
559 ctx->enc = enc;
560
561 tfm->crt_aead.reqsize = max_t(unsigned int,
562 crypto_ahash_reqsize(auth) + ctx->reqoff +
563 sizeof(struct authenc_request_ctx) +
564 sizeof(struct ahash_request),
565 sizeof(struct skcipher_givcrypt_request) +
566 crypto_ablkcipher_reqsize(enc) +
567 crypto_ablkcipher_ivsize(enc));
568
569 return 0;
570
571err_free_ahash:
572 crypto_free_ahash(auth);
573 return err;
574}
575
576static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
577{
578 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
579
580 crypto_free_ahash(ctx->auth);
581 crypto_free_ablkcipher(ctx->enc);
582}
583
584static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
585{
586 struct crypto_attr_type *algt;
587 struct crypto_instance *inst;
588 struct hash_alg_common *auth;
589 struct crypto_alg *auth_base;
590 struct crypto_alg *enc;
591 struct authenc_instance_ctx *ctx;
592 const char *enc_name;
593 int err;
594
595 algt = crypto_get_attr_type(tb);
596 err = PTR_ERR(algt);
597 if (IS_ERR(algt))
598 return ERR_PTR(err);
599
600 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
601 return ERR_PTR(-EINVAL);
602
603 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
604 CRYPTO_ALG_TYPE_AHASH_MASK);
605 if (IS_ERR(auth))
606 return ERR_PTR(PTR_ERR(auth));
607
608 auth_base = &auth->base;
609
610 enc_name = crypto_attr_alg_name(tb[2]);
611 err = PTR_ERR(enc_name);
612 if (IS_ERR(enc_name))
613 goto out_put_auth;
614
615 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
616 err = -ENOMEM;
617 if (!inst)
618 goto out_put_auth;
619
620 ctx = crypto_instance_ctx(inst);
621
622 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
623 if (err)
624 goto err_free_inst;
625
626 crypto_set_skcipher_spawn(&ctx->enc, inst);
627 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
628 crypto_requires_sync(algt->type,
629 algt->mask));
630 if (err)
631 goto err_drop_auth;
632
633 enc = crypto_skcipher_spawn_alg(&ctx->enc);
634
635 err = -ENAMETOOLONG;
636 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
637 "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >=
638 CRYPTO_MAX_ALG_NAME)
639 goto err_drop_enc;
640
641 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
642 "authenc(%s,%s)", auth_base->cra_driver_name,
643 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
644 goto err_drop_enc;
645
646 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
647 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
648 inst->alg.cra_priority = enc->cra_priority *
649 10 + auth_base->cra_priority;
650 inst->alg.cra_blocksize = enc->cra_blocksize;
651 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
652 inst->alg.cra_type = &crypto_aead_type;
653
654 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
655 inst->alg.cra_aead.maxauthsize = auth->digestsize;
656
657 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
658
659 inst->alg.cra_init = crypto_authenc_init_tfm;
660 inst->alg.cra_exit = crypto_authenc_exit_tfm;
661
662 inst->alg.cra_aead.setkey = crypto_authenc_setkey;
663 inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
664 inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
665 inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
666
667out:
668 crypto_mod_put(auth_base);
669 return inst;
670
671err_drop_enc:
672 crypto_drop_skcipher(&ctx->enc);
673err_drop_auth:
674 crypto_drop_ahash(&ctx->auth);
675err_free_inst:
676 kfree(inst);
677out_put_auth:
678 inst = ERR_PTR(err);
679 goto out;
680}
681
682static void crypto_authenc_free(struct crypto_instance *inst)
683{
684 struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
685
686 crypto_drop_skcipher(&ctx->enc);
687 crypto_drop_ahash(&ctx->auth);
688 kfree(inst);
689}
690
691static struct crypto_template crypto_authenc_tmpl = {
692 .name = "authenc",
693 .alloc = crypto_authenc_alloc,
694 .free = crypto_authenc_free,
695 .module = THIS_MODULE,
696};
697
698static int __init crypto_authenc_module_init(void)
699{
700 return crypto_register_template(&crypto_authenc_tmpl);
701}
702
703static void __exit crypto_authenc_module_exit(void)
704{
705 crypto_unregister_template(&crypto_authenc_tmpl);
706}
707
708module_init(crypto_authenc_module_init);
709module_exit(crypto_authenc_module_exit);
710
711MODULE_LICENSE("GPL");
712MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
713
