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1/*
2 * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
3 * derived from authenc.c
4 *
5 * Copyright (C) 2010 secunet Security Networks AG
6 * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 */
14
15#include <crypto/aead.h>
16#include <crypto/internal/hash.h>
17#include <crypto/internal/skcipher.h>
18#include <crypto/authenc.h>
19#include <crypto/scatterwalk.h>
20#include <linux/err.h>
21#include <linux/init.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/rtnetlink.h>
25#include <linux/slab.h>
26#include <linux/spinlock.h>
27
28struct authenc_esn_instance_ctx {
29 struct crypto_ahash_spawn auth;
30 struct crypto_skcipher_spawn enc;
31};
32
33struct crypto_authenc_esn_ctx {
34 unsigned int reqoff;
35 struct crypto_ahash *auth;
36 struct crypto_ablkcipher *enc;
37};
38
39struct authenc_esn_request_ctx {
40 unsigned int cryptlen;
41 unsigned int headlen;
42 unsigned int trailen;
43 struct scatterlist *sg;
44 struct scatterlist hsg[2];
45 struct scatterlist tsg[1];
46 struct scatterlist cipher[2];
47 crypto_completion_t complete;
48 crypto_completion_t update_complete;
49 crypto_completion_t update_complete2;
50 char tail[];
51};
52
53static void authenc_esn_request_complete(struct aead_request *req, int err)
54{
55 if (err != -EINPROGRESS)
56 aead_request_complete(req, err);
57}
58
59static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
60 unsigned int keylen)
61{
62 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
63 struct crypto_ahash *auth = ctx->auth;
64 struct crypto_ablkcipher *enc = ctx->enc;
65 struct crypto_authenc_keys keys;
66 int err = -EINVAL;
67
68 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
69 goto badkey;
70
71 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
72 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
73 CRYPTO_TFM_REQ_MASK);
74 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
75 crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
76 CRYPTO_TFM_RES_MASK);
77
78 if (err)
79 goto out;
80
81 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
82 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
83 CRYPTO_TFM_REQ_MASK);
84 err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen);
85 crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) &
86 CRYPTO_TFM_RES_MASK);
87
88out:
89 return err;
90
91badkey:
92 crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
93 goto out;
94}
95
96static void authenc_esn_geniv_ahash_update_done(struct crypto_async_request *areq,
97 int err)
98{
99 struct aead_request *req = areq->data;
100 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
101 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
102 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
103 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
104
105 if (err)
106 goto out;
107
108 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
109 areq_ctx->cryptlen);
110 ahash_request_set_callback(ahreq, aead_request_flags(req) &
111 CRYPTO_TFM_REQ_MAY_SLEEP,
112 areq_ctx->update_complete2, req);
113
114 err = crypto_ahash_update(ahreq);
115 if (err)
116 goto out;
117
118 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
119 areq_ctx->trailen);
120 ahash_request_set_callback(ahreq, aead_request_flags(req) &
121 CRYPTO_TFM_REQ_MAY_SLEEP,
122 areq_ctx->complete, req);
123
124 err = crypto_ahash_finup(ahreq);
125 if (err)
126 goto out;
127
128 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
129 areq_ctx->cryptlen,
130 crypto_aead_authsize(authenc_esn), 1);
131
132out:
133 authenc_esn_request_complete(req, err);
134}
135
136static void authenc_esn_geniv_ahash_update_done2(struct crypto_async_request *areq,
137 int err)
138{
139 struct aead_request *req = areq->data;
140 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
141 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
142 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
143 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
144
145 if (err)
146 goto out;
147
148 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
149 areq_ctx->trailen);
150 ahash_request_set_callback(ahreq, aead_request_flags(req) &
151 CRYPTO_TFM_REQ_MAY_SLEEP,
152 areq_ctx->complete, req);
153
154 err = crypto_ahash_finup(ahreq);
155 if (err)
156 goto out;
157
158 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
159 areq_ctx->cryptlen,
160 crypto_aead_authsize(authenc_esn), 1);
161
162out:
163 authenc_esn_request_complete(req, err);
164}
165
166
167static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
168 int err)
169{
170 struct aead_request *req = areq->data;
171 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
172 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
173 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
174 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
175
176 if (err)
177 goto out;
178
179 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
180 areq_ctx->cryptlen,
181 crypto_aead_authsize(authenc_esn), 1);
182
183out:
184 aead_request_complete(req, err);
185}
186
187
188static void authenc_esn_verify_ahash_update_done(struct crypto_async_request *areq,
189 int err)
190{
191 u8 *ihash;
192 unsigned int authsize;
193 struct ablkcipher_request *abreq;
194 struct aead_request *req = areq->data;
195 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
196 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
197 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
198 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
199 unsigned int cryptlen = req->cryptlen;
200
201 if (err)
202 goto out;
203
204 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
205 areq_ctx->cryptlen);
206
207 ahash_request_set_callback(ahreq,
208 aead_request_flags(req) &
209 CRYPTO_TFM_REQ_MAY_SLEEP,
210 areq_ctx->update_complete2, req);
211
212 err = crypto_ahash_update(ahreq);
213 if (err)
214 goto out;
215
216 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
217 areq_ctx->trailen);
218 ahash_request_set_callback(ahreq, aead_request_flags(req) &
219 CRYPTO_TFM_REQ_MAY_SLEEP,
220 areq_ctx->complete, req);
221
222 err = crypto_ahash_finup(ahreq);
223 if (err)
224 goto out;
225
226 authsize = crypto_aead_authsize(authenc_esn);
227 cryptlen -= authsize;
228 ihash = ahreq->result + authsize;
229 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
230 authsize, 0);
231
232 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
233 if (err)
234 goto out;
235
236 abreq = aead_request_ctx(req);
237 ablkcipher_request_set_tfm(abreq, ctx->enc);
238 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
239 req->base.complete, req->base.data);
240 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
241 cryptlen, req->iv);
242
243 err = crypto_ablkcipher_decrypt(abreq);
244
245out:
246 authenc_esn_request_complete(req, err);
247}
248
249static void authenc_esn_verify_ahash_update_done2(struct crypto_async_request *areq,
250 int err)
251{
252 u8 *ihash;
253 unsigned int authsize;
254 struct ablkcipher_request *abreq;
255 struct aead_request *req = areq->data;
256 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
257 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
258 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
259 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
260 unsigned int cryptlen = req->cryptlen;
261
262 if (err)
263 goto out;
264
265 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
266 areq_ctx->trailen);
267 ahash_request_set_callback(ahreq, aead_request_flags(req) &
268 CRYPTO_TFM_REQ_MAY_SLEEP,
269 areq_ctx->complete, req);
270
271 err = crypto_ahash_finup(ahreq);
272 if (err)
273 goto out;
274
275 authsize = crypto_aead_authsize(authenc_esn);
276 cryptlen -= authsize;
277 ihash = ahreq->result + authsize;
278 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
279 authsize, 0);
280
281 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
282 if (err)
283 goto out;
284
285 abreq = aead_request_ctx(req);
286 ablkcipher_request_set_tfm(abreq, ctx->enc);
287 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
288 req->base.complete, req->base.data);
289 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
290 cryptlen, req->iv);
291
292 err = crypto_ablkcipher_decrypt(abreq);
293
294out:
295 authenc_esn_request_complete(req, err);
296}
297
298
299static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
300 int err)
301{
302 u8 *ihash;
303 unsigned int authsize;
304 struct ablkcipher_request *abreq;
305 struct aead_request *req = areq->data;
306 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
307 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
308 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
309 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
310 unsigned int cryptlen = req->cryptlen;
311
312 if (err)
313 goto out;
314
315 authsize = crypto_aead_authsize(authenc_esn);
316 cryptlen -= authsize;
317 ihash = ahreq->result + authsize;
318 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
319 authsize, 0);
320
321 err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
322 if (err)
323 goto out;
324
325 abreq = aead_request_ctx(req);
326 ablkcipher_request_set_tfm(abreq, ctx->enc);
327 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
328 req->base.complete, req->base.data);
329 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
330 cryptlen, req->iv);
331
332 err = crypto_ablkcipher_decrypt(abreq);
333
334out:
335 authenc_esn_request_complete(req, err);
336}
337
338static u8 *crypto_authenc_esn_ahash(struct aead_request *req,
339 unsigned int flags)
340{
341 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
342 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
343 struct crypto_ahash *auth = ctx->auth;
344 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
345 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
346 u8 *hash = areq_ctx->tail;
347 int err;
348
349 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
350 crypto_ahash_alignmask(auth) + 1);
351
352 ahash_request_set_tfm(ahreq, auth);
353
354 err = crypto_ahash_init(ahreq);
355 if (err)
356 return ERR_PTR(err);
357
358 ahash_request_set_crypt(ahreq, areq_ctx->hsg, hash, areq_ctx->headlen);
359 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
360 areq_ctx->update_complete, req);
361
362 err = crypto_ahash_update(ahreq);
363 if (err)
364 return ERR_PTR(err);
365
366 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, areq_ctx->cryptlen);
367 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
368 areq_ctx->update_complete2, req);
369
370 err = crypto_ahash_update(ahreq);
371 if (err)
372 return ERR_PTR(err);
373
374 ahash_request_set_crypt(ahreq, areq_ctx->tsg, hash,
375 areq_ctx->trailen);
376 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
377 areq_ctx->complete, req);
378
379 err = crypto_ahash_finup(ahreq);
380 if (err)
381 return ERR_PTR(err);
382
383 return hash;
384}
385
386static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv,
387 unsigned int flags)
388{
389 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
390 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
391 struct scatterlist *dst = req->dst;
392 struct scatterlist *assoc = req->assoc;
393 struct scatterlist *cipher = areq_ctx->cipher;
394 struct scatterlist *hsg = areq_ctx->hsg;
395 struct scatterlist *tsg = areq_ctx->tsg;
396 struct scatterlist *assoc1;
397 struct scatterlist *assoc2;
398 unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
399 unsigned int cryptlen = req->cryptlen;
400 struct page *dstp;
401 u8 *vdst;
402 u8 *hash;
403
404 dstp = sg_page(dst);
405 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
406
407 if (ivsize) {
408 sg_init_table(cipher, 2);
409 sg_set_buf(cipher, iv, ivsize);
410 scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2);
411 dst = cipher;
412 cryptlen += ivsize;
413 }
414
415 if (sg_is_last(assoc))
416 return -EINVAL;
417
418 assoc1 = assoc + 1;
419 if (sg_is_last(assoc1))
420 return -EINVAL;
421
422 assoc2 = assoc + 2;
423 if (!sg_is_last(assoc2))
424 return -EINVAL;
425
426 sg_init_table(hsg, 2);
427 sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset);
428 sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset);
429
430 sg_init_table(tsg, 1);
431 sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset);
432
433 areq_ctx->cryptlen = cryptlen;
434 areq_ctx->headlen = assoc->length + assoc2->length;
435 areq_ctx->trailen = assoc1->length;
436 areq_ctx->sg = dst;
437
438 areq_ctx->complete = authenc_esn_geniv_ahash_done;
439 areq_ctx->update_complete = authenc_esn_geniv_ahash_update_done;
440 areq_ctx->update_complete2 = authenc_esn_geniv_ahash_update_done2;
441
442 hash = crypto_authenc_esn_ahash(req, flags);
443 if (IS_ERR(hash))
444 return PTR_ERR(hash);
445
446 scatterwalk_map_and_copy(hash, dst, cryptlen,
447 crypto_aead_authsize(authenc_esn), 1);
448 return 0;
449}
450
451
452static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
453 int err)
454{
455 struct aead_request *areq = req->data;
456
457 if (!err) {
458 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(areq);
459 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
460 struct ablkcipher_request *abreq = aead_request_ctx(areq);
461 u8 *iv = (u8 *)(abreq + 1) +
462 crypto_ablkcipher_reqsize(ctx->enc);
463
464 err = crypto_authenc_esn_genicv(areq, iv, 0);
465 }
466
467 authenc_esn_request_complete(areq, err);
468}
469
470static int crypto_authenc_esn_encrypt(struct aead_request *req)
471{
472 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
473 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
474 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
475 struct crypto_ablkcipher *enc = ctx->enc;
476 struct scatterlist *dst = req->dst;
477 unsigned int cryptlen = req->cryptlen;
478 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
479 + ctx->reqoff);
480 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
481 int err;
482
483 ablkcipher_request_set_tfm(abreq, enc);
484 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
485 crypto_authenc_esn_encrypt_done, req);
486 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
487
488 memcpy(iv, req->iv, crypto_aead_ivsize(authenc_esn));
489
490 err = crypto_ablkcipher_encrypt(abreq);
491 if (err)
492 return err;
493
494 return crypto_authenc_esn_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
495}
496
497static void crypto_authenc_esn_givencrypt_done(struct crypto_async_request *req,
498 int err)
499{
500 struct aead_request *areq = req->data;
501
502 if (!err) {
503 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
504
505 err = crypto_authenc_esn_genicv(areq, greq->giv, 0);
506 }
507
508 authenc_esn_request_complete(areq, err);
509}
510
511static int crypto_authenc_esn_givencrypt(struct aead_givcrypt_request *req)
512{
513 struct crypto_aead *authenc_esn = aead_givcrypt_reqtfm(req);
514 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
515 struct aead_request *areq = &req->areq;
516 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
517 u8 *iv = req->giv;
518 int err;
519
520 skcipher_givcrypt_set_tfm(greq, ctx->enc);
521 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
522 crypto_authenc_esn_givencrypt_done, areq);
523 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
524 areq->iv);
525 skcipher_givcrypt_set_giv(greq, iv, req->seq);
526
527 err = crypto_skcipher_givencrypt(greq);
528 if (err)
529 return err;
530
531 return crypto_authenc_esn_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
532}
533
534static int crypto_authenc_esn_verify(struct aead_request *req)
535{
536 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
537 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
538 u8 *ohash;
539 u8 *ihash;
540 unsigned int authsize;
541
542 areq_ctx->complete = authenc_esn_verify_ahash_done;
543 areq_ctx->update_complete = authenc_esn_verify_ahash_update_done;
544
545 ohash = crypto_authenc_esn_ahash(req, CRYPTO_TFM_REQ_MAY_SLEEP);
546 if (IS_ERR(ohash))
547 return PTR_ERR(ohash);
548
549 authsize = crypto_aead_authsize(authenc_esn);
550 ihash = ohash + authsize;
551 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
552 authsize, 0);
553 return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0;
554}
555
556static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv,
557 unsigned int cryptlen)
558{
559 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
560 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
561 struct scatterlist *src = req->src;
562 struct scatterlist *assoc = req->assoc;
563 struct scatterlist *cipher = areq_ctx->cipher;
564 struct scatterlist *hsg = areq_ctx->hsg;
565 struct scatterlist *tsg = areq_ctx->tsg;
566 struct scatterlist *assoc1;
567 struct scatterlist *assoc2;
568 unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
569 struct page *srcp;
570 u8 *vsrc;
571
572 srcp = sg_page(src);
573 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
574
575 if (ivsize) {
576 sg_init_table(cipher, 2);
577 sg_set_buf(cipher, iv, ivsize);
578 scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2);
579 src = cipher;
580 cryptlen += ivsize;
581 }
582
583 if (sg_is_last(assoc))
584 return -EINVAL;
585
586 assoc1 = assoc + 1;
587 if (sg_is_last(assoc1))
588 return -EINVAL;
589
590 assoc2 = assoc + 2;
591 if (!sg_is_last(assoc2))
592 return -EINVAL;
593
594 sg_init_table(hsg, 2);
595 sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset);
596 sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset);
597
598 sg_init_table(tsg, 1);
599 sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset);
600
601 areq_ctx->cryptlen = cryptlen;
602 areq_ctx->headlen = assoc->length + assoc2->length;
603 areq_ctx->trailen = assoc1->length;
604 areq_ctx->sg = src;
605
606 areq_ctx->complete = authenc_esn_verify_ahash_done;
607 areq_ctx->update_complete = authenc_esn_verify_ahash_update_done;
608 areq_ctx->update_complete2 = authenc_esn_verify_ahash_update_done2;
609
610 return crypto_authenc_esn_verify(req);
611}
612
613static int crypto_authenc_esn_decrypt(struct aead_request *req)
614{
615 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
616 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
617 struct ablkcipher_request *abreq = aead_request_ctx(req);
618 unsigned int cryptlen = req->cryptlen;
619 unsigned int authsize = crypto_aead_authsize(authenc_esn);
620 u8 *iv = req->iv;
621 int err;
622
623 if (cryptlen < authsize)
624 return -EINVAL;
625 cryptlen -= authsize;
626
627 err = crypto_authenc_esn_iverify(req, iv, cryptlen);
628 if (err)
629 return err;
630
631 ablkcipher_request_set_tfm(abreq, ctx->enc);
632 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
633 req->base.complete, req->base.data);
634 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
635
636 return crypto_ablkcipher_decrypt(abreq);
637}
638
639static int crypto_authenc_esn_init_tfm(struct crypto_tfm *tfm)
640{
641 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
642 struct authenc_esn_instance_ctx *ictx = crypto_instance_ctx(inst);
643 struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm);
644 struct crypto_ahash *auth;
645 struct crypto_ablkcipher *enc;
646 int err;
647
648 auth = crypto_spawn_ahash(&ictx->auth);
649 if (IS_ERR(auth))
650 return PTR_ERR(auth);
651
652 enc = crypto_spawn_skcipher(&ictx->enc);
653 err = PTR_ERR(enc);
654 if (IS_ERR(enc))
655 goto err_free_ahash;
656
657 ctx->auth = auth;
658 ctx->enc = enc;
659
660 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
661 crypto_ahash_alignmask(auth),
662 crypto_ahash_alignmask(auth) + 1) +
663 crypto_ablkcipher_ivsize(enc);
664
665 tfm->crt_aead.reqsize = sizeof(struct authenc_esn_request_ctx) +
666 ctx->reqoff +
667 max_t(unsigned int,
668 crypto_ahash_reqsize(auth) +
669 sizeof(struct ahash_request),
670 sizeof(struct skcipher_givcrypt_request) +
671 crypto_ablkcipher_reqsize(enc));
672
673 return 0;
674
675err_free_ahash:
676 crypto_free_ahash(auth);
677 return err;
678}
679
680static void crypto_authenc_esn_exit_tfm(struct crypto_tfm *tfm)
681{
682 struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm);
683
684 crypto_free_ahash(ctx->auth);
685 crypto_free_ablkcipher(ctx->enc);
686}
687
688static struct crypto_instance *crypto_authenc_esn_alloc(struct rtattr **tb)
689{
690 struct crypto_attr_type *algt;
691 struct crypto_instance *inst;
692 struct hash_alg_common *auth;
693 struct crypto_alg *auth_base;
694 struct crypto_alg *enc;
695 struct authenc_esn_instance_ctx *ctx;
696 const char *enc_name;
697 int err;
698
699 algt = crypto_get_attr_type(tb);
700 if (IS_ERR(algt))
701 return ERR_CAST(algt);
702
703 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
704 return ERR_PTR(-EINVAL);
705
706 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
707 CRYPTO_ALG_TYPE_AHASH_MASK);
708 if (IS_ERR(auth))
709 return ERR_CAST(auth);
710
711 auth_base = &auth->base;
712
713 enc_name = crypto_attr_alg_name(tb[2]);
714 err = PTR_ERR(enc_name);
715 if (IS_ERR(enc_name))
716 goto out_put_auth;
717
718 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
719 err = -ENOMEM;
720 if (!inst)
721 goto out_put_auth;
722
723 ctx = crypto_instance_ctx(inst);
724
725 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
726 if (err)
727 goto err_free_inst;
728
729 crypto_set_skcipher_spawn(&ctx->enc, inst);
730 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
731 crypto_requires_sync(algt->type,
732 algt->mask));
733 if (err)
734 goto err_drop_auth;
735
736 enc = crypto_skcipher_spawn_alg(&ctx->enc);
737
738 err = -ENAMETOOLONG;
739 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
740 "authencesn(%s,%s)", auth_base->cra_name, enc->cra_name) >=
741 CRYPTO_MAX_ALG_NAME)
742 goto err_drop_enc;
743
744 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
745 "authencesn(%s,%s)", auth_base->cra_driver_name,
746 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
747 goto err_drop_enc;
748
749 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
750 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
751 inst->alg.cra_priority = enc->cra_priority *
752 10 + auth_base->cra_priority;
753 inst->alg.cra_blocksize = enc->cra_blocksize;
754 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
755 inst->alg.cra_type = &crypto_aead_type;
756
757 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
758 inst->alg.cra_aead.maxauthsize = auth->digestsize;
759
760 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
761
762 inst->alg.cra_init = crypto_authenc_esn_init_tfm;
763 inst->alg.cra_exit = crypto_authenc_esn_exit_tfm;
764
765 inst->alg.cra_aead.setkey = crypto_authenc_esn_setkey;
766 inst->alg.cra_aead.encrypt = crypto_authenc_esn_encrypt;
767 inst->alg.cra_aead.decrypt = crypto_authenc_esn_decrypt;
768 inst->alg.cra_aead.givencrypt = crypto_authenc_esn_givencrypt;
769
770out:
771 crypto_mod_put(auth_base);
772 return inst;
773
774err_drop_enc:
775 crypto_drop_skcipher(&ctx->enc);
776err_drop_auth:
777 crypto_drop_ahash(&ctx->auth);
778err_free_inst:
779 kfree(inst);
780out_put_auth:
781 inst = ERR_PTR(err);
782 goto out;
783}
784
785static void crypto_authenc_esn_free(struct crypto_instance *inst)
786{
787 struct authenc_esn_instance_ctx *ctx = crypto_instance_ctx(inst);
788
789 crypto_drop_skcipher(&ctx->enc);
790 crypto_drop_ahash(&ctx->auth);
791 kfree(inst);
792}
793
794static struct crypto_template crypto_authenc_esn_tmpl = {
795 .name = "authencesn",
796 .alloc = crypto_authenc_esn_alloc,
797 .free = crypto_authenc_esn_free,
798 .module = THIS_MODULE,
799};
800
801static int __init crypto_authenc_esn_module_init(void)
802{
803 return crypto_register_template(&crypto_authenc_esn_tmpl);
804}
805
806static void __exit crypto_authenc_esn_module_exit(void)
807{
808 crypto_unregister_template(&crypto_authenc_esn_tmpl);
809}
810
811module_init(crypto_authenc_esn_module_init);
812module_exit(crypto_authenc_esn_module_exit);
813
814MODULE_LICENSE("GPL");
815MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
816MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
1/*
2 * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
3 * derived from authenc.c
4 *
5 * Copyright (C) 2010 secunet Security Networks AG
6 * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
7 * Copyright (c) 2015 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
16#include <crypto/internal/aead.h>
17#include <crypto/internal/hash.h>
18#include <crypto/internal/skcipher.h>
19#include <crypto/authenc.h>
20#include <crypto/null.h>
21#include <crypto/scatterwalk.h>
22#include <linux/err.h>
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/rtnetlink.h>
27#include <linux/slab.h>
28#include <linux/spinlock.h>
29
30struct authenc_esn_instance_ctx {
31 struct crypto_ahash_spawn auth;
32 struct crypto_skcipher_spawn enc;
33};
34
35struct crypto_authenc_esn_ctx {
36 unsigned int reqoff;
37 struct crypto_ahash *auth;
38 struct crypto_skcipher *enc;
39 struct crypto_skcipher *null;
40};
41
42struct authenc_esn_request_ctx {
43 struct scatterlist src[2];
44 struct scatterlist dst[2];
45 char tail[];
46};
47
48static void authenc_esn_request_complete(struct aead_request *req, int err)
49{
50 if (err != -EINPROGRESS)
51 aead_request_complete(req, err);
52}
53
54static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
55 unsigned int authsize)
56{
57 if (authsize > 0 && authsize < 4)
58 return -EINVAL;
59
60 return 0;
61}
62
63static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
64 unsigned int keylen)
65{
66 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
67 struct crypto_ahash *auth = ctx->auth;
68 struct crypto_skcipher *enc = ctx->enc;
69 struct crypto_authenc_keys keys;
70 int err = -EINVAL;
71
72 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
73 goto badkey;
74
75 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
76 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
77 CRYPTO_TFM_REQ_MASK);
78 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
79 crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
80 CRYPTO_TFM_RES_MASK);
81
82 if (err)
83 goto out;
84
85 crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
86 crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
87 CRYPTO_TFM_REQ_MASK);
88 err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
89 crypto_aead_set_flags(authenc_esn, crypto_skcipher_get_flags(enc) &
90 CRYPTO_TFM_RES_MASK);
91
92out:
93 return err;
94
95badkey:
96 crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
97 goto out;
98}
99
100static int crypto_authenc_esn_genicv_tail(struct aead_request *req,
101 unsigned int flags)
102{
103 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
104 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
105 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
106 struct crypto_ahash *auth = ctx->auth;
107 u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
108 crypto_ahash_alignmask(auth) + 1);
109 unsigned int authsize = crypto_aead_authsize(authenc_esn);
110 unsigned int assoclen = req->assoclen;
111 unsigned int cryptlen = req->cryptlen;
112 struct scatterlist *dst = req->dst;
113 u32 tmp[2];
114
115 /* Move high-order bits of sequence number back. */
116 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
117 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
118 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
119
120 scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1);
121 return 0;
122}
123
124static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
125 int err)
126{
127 struct aead_request *req = areq->data;
128
129 err = err ?: crypto_authenc_esn_genicv_tail(req, 0);
130 aead_request_complete(req, err);
131}
132
133static int crypto_authenc_esn_genicv(struct aead_request *req,
134 unsigned int flags)
135{
136 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
137 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
138 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
139 struct crypto_ahash *auth = ctx->auth;
140 u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
141 crypto_ahash_alignmask(auth) + 1);
142 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
143 unsigned int authsize = crypto_aead_authsize(authenc_esn);
144 unsigned int assoclen = req->assoclen;
145 unsigned int cryptlen = req->cryptlen;
146 struct scatterlist *dst = req->dst;
147 u32 tmp[2];
148
149 if (!authsize)
150 return 0;
151
152 /* Move high-order bits of sequence number to the end. */
153 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
154 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
155 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
156
157 sg_init_table(areq_ctx->dst, 2);
158 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
159
160 ahash_request_set_tfm(ahreq, auth);
161 ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen);
162 ahash_request_set_callback(ahreq, flags,
163 authenc_esn_geniv_ahash_done, req);
164
165 return crypto_ahash_digest(ahreq) ?:
166 crypto_authenc_esn_genicv_tail(req, aead_request_flags(req));
167}
168
169
170static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
171 int err)
172{
173 struct aead_request *areq = req->data;
174
175 if (!err)
176 err = crypto_authenc_esn_genicv(areq, 0);
177
178 authenc_esn_request_complete(areq, err);
179}
180
181static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
182{
183 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
184 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
185 SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
186
187 skcipher_request_set_tfm(skreq, ctx->null);
188 skcipher_request_set_callback(skreq, aead_request_flags(req),
189 NULL, NULL);
190 skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);
191
192 return crypto_skcipher_encrypt(skreq);
193}
194
195static int crypto_authenc_esn_encrypt(struct aead_request *req)
196{
197 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
198 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
199 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
200 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
201 ctx->reqoff);
202 struct crypto_skcipher *enc = ctx->enc;
203 unsigned int assoclen = req->assoclen;
204 unsigned int cryptlen = req->cryptlen;
205 struct scatterlist *src, *dst;
206 int err;
207
208 sg_init_table(areq_ctx->src, 2);
209 src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
210 dst = src;
211
212 if (req->src != req->dst) {
213 err = crypto_authenc_esn_copy(req, assoclen);
214 if (err)
215 return err;
216
217 sg_init_table(areq_ctx->dst, 2);
218 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
219 }
220
221 skcipher_request_set_tfm(skreq, enc);
222 skcipher_request_set_callback(skreq, aead_request_flags(req),
223 crypto_authenc_esn_encrypt_done, req);
224 skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
225
226 err = crypto_skcipher_encrypt(skreq);
227 if (err)
228 return err;
229
230 return crypto_authenc_esn_genicv(req, aead_request_flags(req));
231}
232
233static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
234 unsigned int flags)
235{
236 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
237 unsigned int authsize = crypto_aead_authsize(authenc_esn);
238 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
239 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
240 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
241 ctx->reqoff);
242 struct crypto_ahash *auth = ctx->auth;
243 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
244 crypto_ahash_alignmask(auth) + 1);
245 unsigned int cryptlen = req->cryptlen - authsize;
246 unsigned int assoclen = req->assoclen;
247 struct scatterlist *dst = req->dst;
248 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
249 u32 tmp[2];
250
251 /* Move high-order bits of sequence number back. */
252 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
253 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
254 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
255
256 if (crypto_memneq(ihash, ohash, authsize))
257 return -EBADMSG;
258
259 sg_init_table(areq_ctx->dst, 2);
260 dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
261
262 skcipher_request_set_tfm(skreq, ctx->enc);
263 skcipher_request_set_callback(skreq, flags,
264 req->base.complete, req->base.data);
265 skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv);
266
267 return crypto_skcipher_decrypt(skreq);
268}
269
270static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
271 int err)
272{
273 struct aead_request *req = areq->data;
274
275 err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
276 aead_request_complete(req, err);
277}
278
279static int crypto_authenc_esn_decrypt(struct aead_request *req)
280{
281 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
282 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
283 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
284 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
285 unsigned int authsize = crypto_aead_authsize(authenc_esn);
286 struct crypto_ahash *auth = ctx->auth;
287 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
288 crypto_ahash_alignmask(auth) + 1);
289 unsigned int assoclen = req->assoclen;
290 unsigned int cryptlen = req->cryptlen;
291 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
292 struct scatterlist *dst = req->dst;
293 u32 tmp[2];
294 int err;
295
296 cryptlen -= authsize;
297
298 if (req->src != dst) {
299 err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
300 if (err)
301 return err;
302 }
303
304 scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
305 authsize, 0);
306
307 if (!authsize)
308 goto tail;
309
310 /* Move high-order bits of sequence number to the end. */
311 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
312 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
313 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
314
315 sg_init_table(areq_ctx->dst, 2);
316 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
317
318 ahash_request_set_tfm(ahreq, auth);
319 ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
320 ahash_request_set_callback(ahreq, aead_request_flags(req),
321 authenc_esn_verify_ahash_done, req);
322
323 err = crypto_ahash_digest(ahreq);
324 if (err)
325 return err;
326
327tail:
328 return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
329}
330
331static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
332{
333 struct aead_instance *inst = aead_alg_instance(tfm);
334 struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
335 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
336 struct crypto_ahash *auth;
337 struct crypto_skcipher *enc;
338 struct crypto_skcipher *null;
339 int err;
340
341 auth = crypto_spawn_ahash(&ictx->auth);
342 if (IS_ERR(auth))
343 return PTR_ERR(auth);
344
345 enc = crypto_spawn_skcipher(&ictx->enc);
346 err = PTR_ERR(enc);
347 if (IS_ERR(enc))
348 goto err_free_ahash;
349
350 null = crypto_get_default_null_skcipher2();
351 err = PTR_ERR(null);
352 if (IS_ERR(null))
353 goto err_free_skcipher;
354
355 ctx->auth = auth;
356 ctx->enc = enc;
357 ctx->null = null;
358
359 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
360 crypto_ahash_alignmask(auth) + 1);
361
362 crypto_aead_set_reqsize(
363 tfm,
364 sizeof(struct authenc_esn_request_ctx) +
365 ctx->reqoff +
366 max_t(unsigned int,
367 crypto_ahash_reqsize(auth) +
368 sizeof(struct ahash_request),
369 sizeof(struct skcipher_request) +
370 crypto_skcipher_reqsize(enc)));
371
372 return 0;
373
374err_free_skcipher:
375 crypto_free_skcipher(enc);
376err_free_ahash:
377 crypto_free_ahash(auth);
378 return err;
379}
380
381static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
382{
383 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
384
385 crypto_free_ahash(ctx->auth);
386 crypto_free_skcipher(ctx->enc);
387 crypto_put_default_null_skcipher2();
388}
389
390static void crypto_authenc_esn_free(struct aead_instance *inst)
391{
392 struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);
393
394 crypto_drop_skcipher(&ctx->enc);
395 crypto_drop_ahash(&ctx->auth);
396 kfree(inst);
397}
398
399static int crypto_authenc_esn_create(struct crypto_template *tmpl,
400 struct rtattr **tb)
401{
402 struct crypto_attr_type *algt;
403 struct aead_instance *inst;
404 struct hash_alg_common *auth;
405 struct crypto_alg *auth_base;
406 struct skcipher_alg *enc;
407 struct authenc_esn_instance_ctx *ctx;
408 const char *enc_name;
409 int err;
410
411 algt = crypto_get_attr_type(tb);
412 if (IS_ERR(algt))
413 return PTR_ERR(algt);
414
415 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
416 return -EINVAL;
417
418 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
419 CRYPTO_ALG_TYPE_AHASH_MASK |
420 crypto_requires_sync(algt->type, algt->mask));
421 if (IS_ERR(auth))
422 return PTR_ERR(auth);
423
424 auth_base = &auth->base;
425
426 enc_name = crypto_attr_alg_name(tb[2]);
427 err = PTR_ERR(enc_name);
428 if (IS_ERR(enc_name))
429 goto out_put_auth;
430
431 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
432 err = -ENOMEM;
433 if (!inst)
434 goto out_put_auth;
435
436 ctx = aead_instance_ctx(inst);
437
438 err = crypto_init_ahash_spawn(&ctx->auth, auth,
439 aead_crypto_instance(inst));
440 if (err)
441 goto err_free_inst;
442
443 crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
444 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
445 crypto_requires_sync(algt->type,
446 algt->mask));
447 if (err)
448 goto err_drop_auth;
449
450 enc = crypto_spawn_skcipher_alg(&ctx->enc);
451
452 err = -ENAMETOOLONG;
453 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
454 "authencesn(%s,%s)", auth_base->cra_name,
455 enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
456 goto err_drop_enc;
457
458 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
459 "authencesn(%s,%s)", auth_base->cra_driver_name,
460 enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
461 goto err_drop_enc;
462
463 inst->alg.base.cra_flags = (auth_base->cra_flags |
464 enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
465 inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
466 auth_base->cra_priority;
467 inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
468 inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
469 enc->base.cra_alignmask;
470 inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
471
472 inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
473 inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
474 inst->alg.maxauthsize = auth->digestsize;
475
476 inst->alg.init = crypto_authenc_esn_init_tfm;
477 inst->alg.exit = crypto_authenc_esn_exit_tfm;
478
479 inst->alg.setkey = crypto_authenc_esn_setkey;
480 inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
481 inst->alg.encrypt = crypto_authenc_esn_encrypt;
482 inst->alg.decrypt = crypto_authenc_esn_decrypt;
483
484 inst->free = crypto_authenc_esn_free,
485
486 err = aead_register_instance(tmpl, inst);
487 if (err)
488 goto err_drop_enc;
489
490out:
491 crypto_mod_put(auth_base);
492 return err;
493
494err_drop_enc:
495 crypto_drop_skcipher(&ctx->enc);
496err_drop_auth:
497 crypto_drop_ahash(&ctx->auth);
498err_free_inst:
499 kfree(inst);
500out_put_auth:
501 goto out;
502}
503
504static struct crypto_template crypto_authenc_esn_tmpl = {
505 .name = "authencesn",
506 .create = crypto_authenc_esn_create,
507 .module = THIS_MODULE,
508};
509
510static int __init crypto_authenc_esn_module_init(void)
511{
512 return crypto_register_template(&crypto_authenc_esn_tmpl);
513}
514
515static void __exit crypto_authenc_esn_module_exit(void)
516{
517 crypto_unregister_template(&crypto_authenc_esn_tmpl);
518}
519
520module_init(crypto_authenc_esn_module_init);
521module_exit(crypto_authenc_esn_module_exit);
522
523MODULE_LICENSE("GPL");
524MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
525MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
526MODULE_ALIAS_CRYPTO("authencesn");