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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 void authenc_request_complete(struct aead_request *req, int err)
50{
51 if (err != -EINPROGRESS)
52 aead_request_complete(req, err);
53}
54
55static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key,
56 unsigned int keylen)
57{
58 unsigned int authkeylen;
59 unsigned int enckeylen;
60 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
61 struct crypto_ahash *auth = ctx->auth;
62 struct crypto_ablkcipher *enc = ctx->enc;
63 struct rtattr *rta = (void *)key;
64 struct crypto_authenc_key_param *param;
65 int err = -EINVAL;
66
67 if (!RTA_OK(rta, keylen))
68 goto badkey;
69 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
70 goto badkey;
71 if (RTA_PAYLOAD(rta) < sizeof(*param))
72 goto badkey;
73
74 param = RTA_DATA(rta);
75 enckeylen = be32_to_cpu(param->enckeylen);
76
77 key += RTA_ALIGN(rta->rta_len);
78 keylen -= RTA_ALIGN(rta->rta_len);
79
80 if (keylen < enckeylen)
81 goto badkey;
82
83 authkeylen = keylen - enckeylen;
84
85 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
86 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) &
87 CRYPTO_TFM_REQ_MASK);
88 err = crypto_ahash_setkey(auth, key, authkeylen);
89 crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) &
90 CRYPTO_TFM_RES_MASK);
91
92 if (err)
93 goto out;
94
95 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
96 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) &
97 CRYPTO_TFM_REQ_MASK);
98 err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
99 crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) &
100 CRYPTO_TFM_RES_MASK);
101
102out:
103 return err;
104
105badkey:
106 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
107 goto out;
108}
109
110static void authenc_chain(struct scatterlist *head, struct scatterlist *sg,
111 int chain)
112{
113 if (chain) {
114 head->length += sg->length;
115 sg = scatterwalk_sg_next(sg);
116 }
117
118 if (sg)
119 scatterwalk_sg_chain(head, 2, sg);
120 else
121 sg_mark_end(head);
122}
123
124static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq,
125 int err)
126{
127 struct aead_request *req = areq->data;
128 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
129 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
130 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
131 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
132
133 if (err)
134 goto out;
135
136 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
137 areq_ctx->cryptlen);
138 ahash_request_set_callback(ahreq, aead_request_flags(req) &
139 CRYPTO_TFM_REQ_MAY_SLEEP,
140 areq_ctx->complete, req);
141
142 err = crypto_ahash_finup(ahreq);
143 if (err)
144 goto out;
145
146 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
147 areq_ctx->cryptlen,
148 crypto_aead_authsize(authenc), 1);
149
150out:
151 authenc_request_complete(req, err);
152}
153
154static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err)
155{
156 struct aead_request *req = areq->data;
157 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
158 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
159 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
160 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
161
162 if (err)
163 goto out;
164
165 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
166 areq_ctx->cryptlen,
167 crypto_aead_authsize(authenc), 1);
168
169out:
170 aead_request_complete(req, err);
171}
172
173static void authenc_verify_ahash_update_done(struct crypto_async_request *areq,
174 int err)
175{
176 u8 *ihash;
177 unsigned int authsize;
178 struct ablkcipher_request *abreq;
179 struct aead_request *req = areq->data;
180 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
181 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
182 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
183 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
184 unsigned int cryptlen = req->cryptlen;
185
186 if (err)
187 goto out;
188
189 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
190 areq_ctx->cryptlen);
191 ahash_request_set_callback(ahreq, aead_request_flags(req) &
192 CRYPTO_TFM_REQ_MAY_SLEEP,
193 areq_ctx->complete, req);
194
195 err = crypto_ahash_finup(ahreq);
196 if (err)
197 goto out;
198
199 authsize = crypto_aead_authsize(authenc);
200 cryptlen -= authsize;
201 ihash = ahreq->result + authsize;
202 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
203 authsize, 0);
204
205 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
206 if (err)
207 goto out;
208
209 abreq = aead_request_ctx(req);
210 ablkcipher_request_set_tfm(abreq, ctx->enc);
211 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
212 req->base.complete, req->base.data);
213 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
214 cryptlen, req->iv);
215
216 err = crypto_ablkcipher_decrypt(abreq);
217
218out:
219 authenc_request_complete(req, err);
220}
221
222static void authenc_verify_ahash_done(struct crypto_async_request *areq,
223 int err)
224{
225 u8 *ihash;
226 unsigned int authsize;
227 struct ablkcipher_request *abreq;
228 struct aead_request *req = areq->data;
229 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
230 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
231 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
232 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
233 unsigned int cryptlen = req->cryptlen;
234
235 if (err)
236 goto out;
237
238 authsize = crypto_aead_authsize(authenc);
239 cryptlen -= authsize;
240 ihash = ahreq->result + authsize;
241 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
242 authsize, 0);
243
244 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
245 if (err)
246 goto out;
247
248 abreq = aead_request_ctx(req);
249 ablkcipher_request_set_tfm(abreq, ctx->enc);
250 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
251 req->base.complete, req->base.data);
252 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
253 cryptlen, req->iv);
254
255 err = crypto_ablkcipher_decrypt(abreq);
256
257out:
258 authenc_request_complete(req, err);
259}
260
261static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags)
262{
263 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
264 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
265 struct crypto_ahash *auth = ctx->auth;
266 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
267 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
268 u8 *hash = areq_ctx->tail;
269 int err;
270
271 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
272 crypto_ahash_alignmask(auth) + 1);
273
274 ahash_request_set_tfm(ahreq, auth);
275
276 err = crypto_ahash_init(ahreq);
277 if (err)
278 return ERR_PTR(err);
279
280 ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen);
281 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
282 areq_ctx->update_complete, req);
283
284 err = crypto_ahash_update(ahreq);
285 if (err)
286 return ERR_PTR(err);
287
288 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
289 areq_ctx->cryptlen);
290 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
291 areq_ctx->complete, req);
292
293 err = crypto_ahash_finup(ahreq);
294 if (err)
295 return ERR_PTR(err);
296
297 return hash;
298}
299
300static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags)
301{
302 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
303 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
304 struct crypto_ahash *auth = ctx->auth;
305 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
306 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
307 u8 *hash = areq_ctx->tail;
308 int err;
309
310 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
311 crypto_ahash_alignmask(auth) + 1);
312
313 ahash_request_set_tfm(ahreq, auth);
314 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash,
315 areq_ctx->cryptlen);
316 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
317 areq_ctx->complete, req);
318
319 err = crypto_ahash_digest(ahreq);
320 if (err)
321 return ERR_PTR(err);
322
323 return hash;
324}
325
326static int crypto_authenc_genicv(struct aead_request *req, u8 *iv,
327 unsigned int flags)
328{
329 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
330 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
331 struct scatterlist *dst = req->dst;
332 struct scatterlist *assoc = req->assoc;
333 struct scatterlist *cipher = areq_ctx->cipher;
334 struct scatterlist *asg = areq_ctx->asg;
335 unsigned int ivsize = crypto_aead_ivsize(authenc);
336 unsigned int cryptlen = req->cryptlen;
337 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
338 struct page *dstp;
339 u8 *vdst;
340 u8 *hash;
341
342 dstp = sg_page(dst);
343 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
344
345 if (ivsize) {
346 sg_init_table(cipher, 2);
347 sg_set_buf(cipher, iv, ivsize);
348 authenc_chain(cipher, dst, vdst == iv + ivsize);
349 dst = cipher;
350 cryptlen += ivsize;
351 }
352
353 if (sg_is_last(assoc)) {
354 authenc_ahash_fn = crypto_authenc_ahash;
355 sg_init_table(asg, 2);
356 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
357 authenc_chain(asg, dst, 0);
358 dst = asg;
359 cryptlen += req->assoclen;
360 }
361
362 areq_ctx->cryptlen = cryptlen;
363 areq_ctx->sg = dst;
364
365 areq_ctx->complete = authenc_geniv_ahash_done;
366 areq_ctx->update_complete = authenc_geniv_ahash_update_done;
367
368 hash = authenc_ahash_fn(req, flags);
369 if (IS_ERR(hash))
370 return PTR_ERR(hash);
371
372 scatterwalk_map_and_copy(hash, dst, cryptlen,
373 crypto_aead_authsize(authenc), 1);
374 return 0;
375}
376
377static void crypto_authenc_encrypt_done(struct crypto_async_request *req,
378 int err)
379{
380 struct aead_request *areq = req->data;
381
382 if (!err) {
383 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
384 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
385 struct ablkcipher_request *abreq = aead_request_ctx(areq);
386 u8 *iv = (u8 *)(abreq + 1) +
387 crypto_ablkcipher_reqsize(ctx->enc);
388
389 err = crypto_authenc_genicv(areq, iv, 0);
390 }
391
392 authenc_request_complete(areq, err);
393}
394
395static int crypto_authenc_encrypt(struct aead_request *req)
396{
397 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
398 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
399 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
400 struct crypto_ablkcipher *enc = ctx->enc;
401 struct scatterlist *dst = req->dst;
402 unsigned int cryptlen = req->cryptlen;
403 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
404 + ctx->reqoff);
405 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
406 int err;
407
408 ablkcipher_request_set_tfm(abreq, enc);
409 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
410 crypto_authenc_encrypt_done, req);
411 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
412
413 memcpy(iv, req->iv, crypto_aead_ivsize(authenc));
414
415 err = crypto_ablkcipher_encrypt(abreq);
416 if (err)
417 return err;
418
419 return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
420}
421
422static void crypto_authenc_givencrypt_done(struct crypto_async_request *req,
423 int err)
424{
425 struct aead_request *areq = req->data;
426
427 if (!err) {
428 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
429
430 err = crypto_authenc_genicv(areq, greq->giv, 0);
431 }
432
433 authenc_request_complete(areq, err);
434}
435
436static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req)
437{
438 struct crypto_aead *authenc = aead_givcrypt_reqtfm(req);
439 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
440 struct aead_request *areq = &req->areq;
441 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
442 u8 *iv = req->giv;
443 int err;
444
445 skcipher_givcrypt_set_tfm(greq, ctx->enc);
446 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
447 crypto_authenc_givencrypt_done, areq);
448 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
449 areq->iv);
450 skcipher_givcrypt_set_giv(greq, iv, req->seq);
451
452 err = crypto_skcipher_givencrypt(greq);
453 if (err)
454 return err;
455
456 return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
457}
458
459static int crypto_authenc_verify(struct aead_request *req,
460 authenc_ahash_t authenc_ahash_fn)
461{
462 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
463 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
464 u8 *ohash;
465 u8 *ihash;
466 unsigned int authsize;
467
468 areq_ctx->complete = authenc_verify_ahash_done;
469 areq_ctx->update_complete = authenc_verify_ahash_update_done;
470
471 ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP);
472 if (IS_ERR(ohash))
473 return PTR_ERR(ohash);
474
475 authsize = crypto_aead_authsize(authenc);
476 ihash = ohash + authsize;
477 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
478 authsize, 0);
479 return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0;
480}
481
482static int crypto_authenc_iverify(struct aead_request *req, u8 *iv,
483 unsigned int cryptlen)
484{
485 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
486 struct authenc_request_ctx *areq_ctx = aead_request_ctx(req);
487 struct scatterlist *src = req->src;
488 struct scatterlist *assoc = req->assoc;
489 struct scatterlist *cipher = areq_ctx->cipher;
490 struct scatterlist *asg = areq_ctx->asg;
491 unsigned int ivsize = crypto_aead_ivsize(authenc);
492 authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb;
493 struct page *srcp;
494 u8 *vsrc;
495
496 srcp = sg_page(src);
497 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
498
499 if (ivsize) {
500 sg_init_table(cipher, 2);
501 sg_set_buf(cipher, iv, ivsize);
502 authenc_chain(cipher, src, vsrc == iv + ivsize);
503 src = cipher;
504 cryptlen += ivsize;
505 }
506
507 if (sg_is_last(assoc)) {
508 authenc_ahash_fn = crypto_authenc_ahash;
509 sg_init_table(asg, 2);
510 sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset);
511 authenc_chain(asg, src, 0);
512 src = asg;
513 cryptlen += req->assoclen;
514 }
515
516 areq_ctx->cryptlen = cryptlen;
517 areq_ctx->sg = src;
518
519 return crypto_authenc_verify(req, authenc_ahash_fn);
520}
521
522static int crypto_authenc_decrypt(struct aead_request *req)
523{
524 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
525 struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc);
526 struct ablkcipher_request *abreq = aead_request_ctx(req);
527 unsigned int cryptlen = req->cryptlen;
528 unsigned int authsize = crypto_aead_authsize(authenc);
529 u8 *iv = req->iv;
530 int err;
531
532 if (cryptlen < authsize)
533 return -EINVAL;
534 cryptlen -= authsize;
535
536 err = crypto_authenc_iverify(req, iv, cryptlen);
537 if (err)
538 return err;
539
540 ablkcipher_request_set_tfm(abreq, ctx->enc);
541 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
542 req->base.complete, req->base.data);
543 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
544
545 return crypto_ablkcipher_decrypt(abreq);
546}
547
548static int crypto_authenc_init_tfm(struct crypto_tfm *tfm)
549{
550 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
551 struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst);
552 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
553 struct crypto_ahash *auth;
554 struct crypto_ablkcipher *enc;
555 int err;
556
557 auth = crypto_spawn_ahash(&ictx->auth);
558 if (IS_ERR(auth))
559 return PTR_ERR(auth);
560
561 enc = crypto_spawn_skcipher(&ictx->enc);
562 err = PTR_ERR(enc);
563 if (IS_ERR(enc))
564 goto err_free_ahash;
565
566 ctx->auth = auth;
567 ctx->enc = enc;
568
569 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
570 crypto_ahash_alignmask(auth),
571 crypto_ahash_alignmask(auth) + 1) +
572 crypto_ablkcipher_ivsize(enc);
573
574 tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) +
575 ctx->reqoff +
576 max_t(unsigned int,
577 crypto_ahash_reqsize(auth) +
578 sizeof(struct ahash_request),
579 sizeof(struct skcipher_givcrypt_request) +
580 crypto_ablkcipher_reqsize(enc));
581
582 return 0;
583
584err_free_ahash:
585 crypto_free_ahash(auth);
586 return err;
587}
588
589static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm)
590{
591 struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm);
592
593 crypto_free_ahash(ctx->auth);
594 crypto_free_ablkcipher(ctx->enc);
595}
596
597static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb)
598{
599 struct crypto_attr_type *algt;
600 struct crypto_instance *inst;
601 struct hash_alg_common *auth;
602 struct crypto_alg *auth_base;
603 struct crypto_alg *enc;
604 struct authenc_instance_ctx *ctx;
605 const char *enc_name;
606 int err;
607
608 algt = crypto_get_attr_type(tb);
609 err = PTR_ERR(algt);
610 if (IS_ERR(algt))
611 return ERR_PTR(err);
612
613 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
614 return ERR_PTR(-EINVAL);
615
616 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
617 CRYPTO_ALG_TYPE_AHASH_MASK);
618 if (IS_ERR(auth))
619 return ERR_PTR(PTR_ERR(auth));
620
621 auth_base = &auth->base;
622
623 enc_name = crypto_attr_alg_name(tb[2]);
624 err = PTR_ERR(enc_name);
625 if (IS_ERR(enc_name))
626 goto out_put_auth;
627
628 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
629 err = -ENOMEM;
630 if (!inst)
631 goto out_put_auth;
632
633 ctx = crypto_instance_ctx(inst);
634
635 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
636 if (err)
637 goto err_free_inst;
638
639 crypto_set_skcipher_spawn(&ctx->enc, inst);
640 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
641 crypto_requires_sync(algt->type,
642 algt->mask));
643 if (err)
644 goto err_drop_auth;
645
646 enc = crypto_skcipher_spawn_alg(&ctx->enc);
647
648 err = -ENAMETOOLONG;
649 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
650 "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >=
651 CRYPTO_MAX_ALG_NAME)
652 goto err_drop_enc;
653
654 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
655 "authenc(%s,%s)", auth_base->cra_driver_name,
656 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
657 goto err_drop_enc;
658
659 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
660 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
661 inst->alg.cra_priority = enc->cra_priority *
662 10 + auth_base->cra_priority;
663 inst->alg.cra_blocksize = enc->cra_blocksize;
664 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
665 inst->alg.cra_type = &crypto_aead_type;
666
667 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
668 inst->alg.cra_aead.maxauthsize = auth->digestsize;
669
670 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx);
671
672 inst->alg.cra_init = crypto_authenc_init_tfm;
673 inst->alg.cra_exit = crypto_authenc_exit_tfm;
674
675 inst->alg.cra_aead.setkey = crypto_authenc_setkey;
676 inst->alg.cra_aead.encrypt = crypto_authenc_encrypt;
677 inst->alg.cra_aead.decrypt = crypto_authenc_decrypt;
678 inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt;
679
680out:
681 crypto_mod_put(auth_base);
682 return inst;
683
684err_drop_enc:
685 crypto_drop_skcipher(&ctx->enc);
686err_drop_auth:
687 crypto_drop_ahash(&ctx->auth);
688err_free_inst:
689 kfree(inst);
690out_put_auth:
691 inst = ERR_PTR(err);
692 goto out;
693}
694
695static void crypto_authenc_free(struct crypto_instance *inst)
696{
697 struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst);
698
699 crypto_drop_skcipher(&ctx->enc);
700 crypto_drop_ahash(&ctx->auth);
701 kfree(inst);
702}
703
704static struct crypto_template crypto_authenc_tmpl = {
705 .name = "authenc",
706 .alloc = crypto_authenc_alloc,
707 .free = crypto_authenc_free,
708 .module = THIS_MODULE,
709};
710
711static int __init crypto_authenc_module_init(void)
712{
713 return crypto_register_template(&crypto_authenc_tmpl);
714}
715
716static void __exit crypto_authenc_module_exit(void)
717{
718 crypto_unregister_template(&crypto_authenc_tmpl);
719}
720
721module_init(crypto_authenc_module_init);
722module_exit(crypto_authenc_module_exit);
723
724MODULE_LICENSE("GPL");
725MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec");
726
