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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/internal/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
28 struct authenc_esn_instance_ctx {
29 struct crypto_ahash_spawn auth;
30 struct crypto_skcipher_spawn enc;
31 };
32
33 struct crypto_authenc_esn_ctx {
34 unsigned int reqoff;
35 struct crypto_ahash *auth;
36 struct crypto_ablkcipher *enc;
37 };
38
39 struct 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
53 static void authenc_esn_request_complete(struct aead_request *req, int err)
54 {
55 if (err != -EINPROGRESS)
56 aead_request_complete(req, err);
57 }
58
59 static 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
88 out:
89 return err;
90
91 badkey:
92 crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
93 goto out;
94 }
95
96 static 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
132 out:
133 authenc_esn_request_complete(req, err);
134 }
135
136 static 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
162 out:
163 authenc_esn_request_complete(req, err);
164 }
165
166
167 static 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
183 out:
184 aead_request_complete(req, err);
185 }
186
187
188 static 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
245 out:
246 authenc_esn_request_complete(req, err);
247 }
248
249 static 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
294 out:
295 authenc_esn_request_complete(req, err);
296 }
297
298
299 static 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
334 out:
335 authenc_esn_request_complete(req, err);
336 }
337
338 static 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
386 static 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 unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
397 unsigned int cryptlen = req->cryptlen;
398 struct page *dstp;
399 u8 *vdst;
400 u8 *hash;
401
402 dstp = sg_page(dst);
403 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
404
405 if (ivsize) {
406 sg_init_table(cipher, 2);
407 sg_set_buf(cipher, iv, ivsize);
408 scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2);
409 dst = cipher;
410 cryptlen += ivsize;
411 }
412
413 if (assoc->length < 12)
414 return -EINVAL;
415
416 sg_init_table(hsg, 2);
417 sg_set_page(hsg, sg_page(assoc), 4, assoc->offset);
418 sg_set_page(hsg + 1, sg_page(assoc), 4, assoc->offset + 8);
419
420 sg_init_table(tsg, 1);
421 sg_set_page(tsg, sg_page(assoc), 4, assoc->offset + 4);
422
423 areq_ctx->cryptlen = cryptlen;
424 areq_ctx->headlen = 8;
425 areq_ctx->trailen = 4;
426 areq_ctx->sg = dst;
427
428 areq_ctx->complete = authenc_esn_geniv_ahash_done;
429 areq_ctx->update_complete = authenc_esn_geniv_ahash_update_done;
430 areq_ctx->update_complete2 = authenc_esn_geniv_ahash_update_done2;
431
432 hash = crypto_authenc_esn_ahash(req, flags);
433 if (IS_ERR(hash))
434 return PTR_ERR(hash);
435
436 scatterwalk_map_and_copy(hash, dst, cryptlen,
437 crypto_aead_authsize(authenc_esn), 1);
438 return 0;
439 }
440
441
442 static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
443 int err)
444 {
445 struct aead_request *areq = req->data;
446
447 if (!err) {
448 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(areq);
449 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
450 struct ablkcipher_request *abreq = aead_request_ctx(areq);
451 u8 *iv = (u8 *)(abreq + 1) +
452 crypto_ablkcipher_reqsize(ctx->enc);
453
454 err = crypto_authenc_esn_genicv(areq, iv, 0);
455 }
456
457 authenc_esn_request_complete(areq, err);
458 }
459
460 static int crypto_authenc_esn_encrypt(struct aead_request *req)
461 {
462 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
463 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
464 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
465 struct crypto_ablkcipher *enc = ctx->enc;
466 struct scatterlist *dst = req->dst;
467 unsigned int cryptlen = req->cryptlen;
468 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
469 + ctx->reqoff);
470 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
471 int err;
472
473 ablkcipher_request_set_tfm(abreq, enc);
474 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
475 crypto_authenc_esn_encrypt_done, req);
476 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
477
478 memcpy(iv, req->iv, crypto_aead_ivsize(authenc_esn));
479
480 err = crypto_ablkcipher_encrypt(abreq);
481 if (err)
482 return err;
483
484 return crypto_authenc_esn_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
485 }
486
487 static void crypto_authenc_esn_givencrypt_done(struct crypto_async_request *req,
488 int err)
489 {
490 struct aead_request *areq = req->data;
491
492 if (!err) {
493 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
494
495 err = crypto_authenc_esn_genicv(areq, greq->giv, 0);
496 }
497
498 authenc_esn_request_complete(areq, err);
499 }
500
501 static int crypto_authenc_esn_givencrypt(struct aead_givcrypt_request *req)
502 {
503 struct crypto_aead *authenc_esn = aead_givcrypt_reqtfm(req);
504 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
505 struct aead_request *areq = &req->areq;
506 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
507 u8 *iv = req->giv;
508 int err;
509
510 skcipher_givcrypt_set_tfm(greq, ctx->enc);
511 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
512 crypto_authenc_esn_givencrypt_done, areq);
513 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
514 areq->iv);
515 skcipher_givcrypt_set_giv(greq, iv, req->seq);
516
517 err = crypto_skcipher_givencrypt(greq);
518 if (err)
519 return err;
520
521 return crypto_authenc_esn_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
522 }
523
524 static int crypto_authenc_esn_verify(struct aead_request *req)
525 {
526 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
527 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
528 u8 *ohash;
529 u8 *ihash;
530 unsigned int authsize;
531
532 areq_ctx->complete = authenc_esn_verify_ahash_done;
533 areq_ctx->update_complete = authenc_esn_verify_ahash_update_done;
534
535 ohash = crypto_authenc_esn_ahash(req, CRYPTO_TFM_REQ_MAY_SLEEP);
536 if (IS_ERR(ohash))
537 return PTR_ERR(ohash);
538
539 authsize = crypto_aead_authsize(authenc_esn);
540 ihash = ohash + authsize;
541 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
542 authsize, 0);
543 return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0;
544 }
545
546 static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv,
547 unsigned int cryptlen)
548 {
549 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
550 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
551 struct scatterlist *src = req->src;
552 struct scatterlist *assoc = req->assoc;
553 struct scatterlist *cipher = areq_ctx->cipher;
554 struct scatterlist *hsg = areq_ctx->hsg;
555 struct scatterlist *tsg = areq_ctx->tsg;
556 unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
557 struct page *srcp;
558 u8 *vsrc;
559
560 srcp = sg_page(src);
561 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
562
563 if (ivsize) {
564 sg_init_table(cipher, 2);
565 sg_set_buf(cipher, iv, ivsize);
566 scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2);
567 src = cipher;
568 cryptlen += ivsize;
569 }
570
571 if (assoc->length < 12)
572 return -EINVAL;
573
574 sg_init_table(hsg, 2);
575 sg_set_page(hsg, sg_page(assoc), 4, assoc->offset);
576 sg_set_page(hsg + 1, sg_page(assoc), 4, assoc->offset + 8);
577
578 sg_init_table(tsg, 1);
579 sg_set_page(tsg, sg_page(assoc), 4, assoc->offset + 4);
580
581 areq_ctx->cryptlen = cryptlen;
582 areq_ctx->headlen = 8;
583 areq_ctx->trailen = 4;
584 areq_ctx->sg = src;
585
586 areq_ctx->complete = authenc_esn_verify_ahash_done;
587 areq_ctx->update_complete = authenc_esn_verify_ahash_update_done;
588 areq_ctx->update_complete2 = authenc_esn_verify_ahash_update_done2;
589
590 return crypto_authenc_esn_verify(req);
591 }
592
593 static int crypto_authenc_esn_decrypt(struct aead_request *req)
594 {
595 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
596 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
597 struct ablkcipher_request *abreq = aead_request_ctx(req);
598 unsigned int cryptlen = req->cryptlen;
599 unsigned int authsize = crypto_aead_authsize(authenc_esn);
600 u8 *iv = req->iv;
601 int err;
602
603 if (cryptlen < authsize)
604 return -EINVAL;
605 cryptlen -= authsize;
606
607 err = crypto_authenc_esn_iverify(req, iv, cryptlen);
608 if (err)
609 return err;
610
611 ablkcipher_request_set_tfm(abreq, ctx->enc);
612 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
613 req->base.complete, req->base.data);
614 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
615
616 return crypto_ablkcipher_decrypt(abreq);
617 }
618
619 static int crypto_authenc_esn_init_tfm(struct crypto_tfm *tfm)
620 {
621 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
622 struct authenc_esn_instance_ctx *ictx = crypto_instance_ctx(inst);
623 struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm);
624 struct crypto_ahash *auth;
625 struct crypto_ablkcipher *enc;
626 int err;
627
628 auth = crypto_spawn_ahash(&ictx->auth);
629 if (IS_ERR(auth))
630 return PTR_ERR(auth);
631
632 enc = crypto_spawn_skcipher(&ictx->enc);
633 err = PTR_ERR(enc);
634 if (IS_ERR(enc))
635 goto err_free_ahash;
636
637 ctx->auth = auth;
638 ctx->enc = enc;
639
640 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
641 crypto_ahash_alignmask(auth),
642 crypto_ahash_alignmask(auth) + 1) +
643 crypto_ablkcipher_ivsize(enc);
644
645 crypto_aead_set_reqsize(__crypto_aead_cast(tfm),
646 sizeof(struct authenc_esn_request_ctx) +
647 ctx->reqoff +
648 max_t(unsigned int,
649 crypto_ahash_reqsize(auth) +
650 sizeof(struct ahash_request),
651 sizeof(struct skcipher_givcrypt_request) +
652 crypto_ablkcipher_reqsize(enc)));
653
654 return 0;
655
656 err_free_ahash:
657 crypto_free_ahash(auth);
658 return err;
659 }
660
661 static void crypto_authenc_esn_exit_tfm(struct crypto_tfm *tfm)
662 {
663 struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm);
664
665 crypto_free_ahash(ctx->auth);
666 crypto_free_ablkcipher(ctx->enc);
667 }
668
669 static struct crypto_instance *crypto_authenc_esn_alloc(struct rtattr **tb)
670 {
671 struct crypto_attr_type *algt;
672 struct crypto_instance *inst;
673 struct hash_alg_common *auth;
674 struct crypto_alg *auth_base;
675 struct crypto_alg *enc;
676 struct authenc_esn_instance_ctx *ctx;
677 const char *enc_name;
678 int err;
679
680 algt = crypto_get_attr_type(tb);
681 if (IS_ERR(algt))
682 return ERR_CAST(algt);
683
684 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
685 return ERR_PTR(-EINVAL);
686
687 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
688 CRYPTO_ALG_TYPE_AHASH_MASK);
689 if (IS_ERR(auth))
690 return ERR_CAST(auth);
691
692 auth_base = &auth->base;
693
694 enc_name = crypto_attr_alg_name(tb[2]);
695 err = PTR_ERR(enc_name);
696 if (IS_ERR(enc_name))
697 goto out_put_auth;
698
699 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
700 err = -ENOMEM;
701 if (!inst)
702 goto out_put_auth;
703
704 ctx = crypto_instance_ctx(inst);
705
706 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
707 if (err)
708 goto err_free_inst;
709
710 crypto_set_skcipher_spawn(&ctx->enc, inst);
711 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
712 crypto_requires_sync(algt->type,
713 algt->mask));
714 if (err)
715 goto err_drop_auth;
716
717 enc = crypto_skcipher_spawn_alg(&ctx->enc);
718
719 err = -ENAMETOOLONG;
720 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
721 "authencesn(%s,%s)", auth_base->cra_name, enc->cra_name) >=
722 CRYPTO_MAX_ALG_NAME)
723 goto err_drop_enc;
724
725 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
726 "authencesn(%s,%s)", auth_base->cra_driver_name,
727 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
728 goto err_drop_enc;
729
730 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
731 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
732 inst->alg.cra_priority = enc->cra_priority *
733 10 + auth_base->cra_priority;
734 inst->alg.cra_blocksize = enc->cra_blocksize;
735 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
736 inst->alg.cra_type = &crypto_aead_type;
737
738 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
739 inst->alg.cra_aead.maxauthsize = auth->digestsize;
740
741 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
742
743 inst->alg.cra_init = crypto_authenc_esn_init_tfm;
744 inst->alg.cra_exit = crypto_authenc_esn_exit_tfm;
745
746 inst->alg.cra_aead.setkey = crypto_authenc_esn_setkey;
747 inst->alg.cra_aead.encrypt = crypto_authenc_esn_encrypt;
748 inst->alg.cra_aead.decrypt = crypto_authenc_esn_decrypt;
749 inst->alg.cra_aead.givencrypt = crypto_authenc_esn_givencrypt;
750
751 out:
752 crypto_mod_put(auth_base);
753 return inst;
754
755 err_drop_enc:
756 crypto_drop_skcipher(&ctx->enc);
757 err_drop_auth:
758 crypto_drop_ahash(&ctx->auth);
759 err_free_inst:
760 kfree(inst);
761 out_put_auth:
762 inst = ERR_PTR(err);
763 goto out;
764 }
765
766 static void crypto_authenc_esn_free(struct crypto_instance *inst)
767 {
768 struct authenc_esn_instance_ctx *ctx = crypto_instance_ctx(inst);
769
770 crypto_drop_skcipher(&ctx->enc);
771 crypto_drop_ahash(&ctx->auth);
772 kfree(inst);
773 }
774
775 static struct crypto_template crypto_authenc_esn_tmpl = {
776 .name = "authencesn",
777 .alloc = crypto_authenc_esn_alloc,
778 .free = crypto_authenc_esn_free,
779 .module = THIS_MODULE,
780 };
781
782 static int __init crypto_authenc_esn_module_init(void)
783 {
784 return crypto_register_template(&crypto_authenc_esn_tmpl);
785 }
786
787 static void __exit crypto_authenc_esn_module_exit(void)
788 {
789 crypto_unregister_template(&crypto_authenc_esn_tmpl);
790 }
791
792 module_init(crypto_authenc_esn_module_init);
793 module_exit(crypto_authenc_esn_module_exit);
794
795 MODULE_LICENSE("GPL");
796 MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
797 MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
798 MODULE_ALIAS_CRYPTO("authencesn");