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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 | |
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 | unsigned int authkeylen; |
63 | unsigned int enckeylen; |
64 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
65 | struct crypto_ahash *auth = ctx->auth; |
66 | struct crypto_ablkcipher *enc = ctx->enc; |
67 | struct rtattr *rta = (void *)key; |
68 | struct crypto_authenc_key_param *param; |
69 | int err = -EINVAL; |
70 | |
71 | if (!RTA_OK(rta, keylen)) |
72 | goto badkey; |
73 | if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) |
74 | goto badkey; |
75 | if (RTA_PAYLOAD(rta) < sizeof(*param)) |
76 | goto badkey; |
77 | |
78 | param = RTA_DATA(rta); |
79 | enckeylen = be32_to_cpu(param->enckeylen); |
80 | |
81 | key += RTA_ALIGN(rta->rta_len); |
82 | keylen -= RTA_ALIGN(rta->rta_len); |
83 | |
84 | if (keylen < enckeylen) |
85 | goto badkey; |
86 | |
87 | authkeylen = keylen - enckeylen; |
88 | |
89 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
90 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) & |
91 | CRYPTO_TFM_REQ_MASK); |
92 | err = crypto_ahash_setkey(auth, key, authkeylen); |
93 | crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) & |
94 | CRYPTO_TFM_RES_MASK); |
95 | |
96 | if (err) |
97 | goto out; |
98 | |
99 | crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); |
100 | crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) & |
101 | CRYPTO_TFM_REQ_MASK); |
102 | err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen); |
103 | crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) & |
104 | CRYPTO_TFM_RES_MASK); |
105 | |
106 | out: |
107 | return err; |
108 | |
109 | badkey: |
110 | crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN); |
111 | goto out; |
112 | } |
113 | |
114 | static void authenc_esn_geniv_ahash_update_done(struct crypto_async_request *areq, |
115 | int err) |
116 | { |
117 | struct aead_request *req = areq->data; |
118 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
119 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
120 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
121 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
122 | |
123 | if (err) |
124 | goto out; |
125 | |
126 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, |
127 | areq_ctx->cryptlen); |
128 | ahash_request_set_callback(ahreq, aead_request_flags(req) & |
129 | CRYPTO_TFM_REQ_MAY_SLEEP, |
130 | areq_ctx->update_complete2, req); |
131 | |
132 | err = crypto_ahash_update(ahreq); |
133 | if (err) |
134 | goto out; |
135 | |
136 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, |
137 | areq_ctx->trailen); |
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_esn), 1); |
149 | |
150 | out: |
151 | authenc_esn_request_complete(req, err); |
152 | } |
153 | |
154 | static void authenc_esn_geniv_ahash_update_done2(struct crypto_async_request *areq, |
155 | int err) |
156 | { |
157 | struct aead_request *req = areq->data; |
158 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
159 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
160 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
161 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
162 | |
163 | if (err) |
164 | goto out; |
165 | |
166 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, |
167 | areq_ctx->trailen); |
168 | ahash_request_set_callback(ahreq, aead_request_flags(req) & |
169 | CRYPTO_TFM_REQ_MAY_SLEEP, |
170 | areq_ctx->complete, req); |
171 | |
172 | err = crypto_ahash_finup(ahreq); |
173 | if (err) |
174 | goto out; |
175 | |
176 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, |
177 | areq_ctx->cryptlen, |
178 | crypto_aead_authsize(authenc_esn), 1); |
179 | |
180 | out: |
181 | authenc_esn_request_complete(req, err); |
182 | } |
183 | |
184 | |
185 | static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq, |
186 | int err) |
187 | { |
188 | struct aead_request *req = areq->data; |
189 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
190 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
191 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
192 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
193 | |
194 | if (err) |
195 | goto out; |
196 | |
197 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, |
198 | areq_ctx->cryptlen, |
199 | crypto_aead_authsize(authenc_esn), 1); |
200 | |
201 | out: |
202 | aead_request_complete(req, err); |
203 | } |
204 | |
205 | |
206 | static void authenc_esn_verify_ahash_update_done(struct crypto_async_request *areq, |
207 | int err) |
208 | { |
209 | u8 *ihash; |
210 | unsigned int authsize; |
211 | struct ablkcipher_request *abreq; |
212 | struct aead_request *req = areq->data; |
213 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
214 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
215 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
216 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
217 | unsigned int cryptlen = req->cryptlen; |
218 | |
219 | if (err) |
220 | goto out; |
221 | |
222 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, |
223 | areq_ctx->cryptlen); |
224 | |
225 | ahash_request_set_callback(ahreq, |
226 | aead_request_flags(req) & |
227 | CRYPTO_TFM_REQ_MAY_SLEEP, |
228 | areq_ctx->update_complete2, req); |
229 | |
230 | err = crypto_ahash_update(ahreq); |
231 | if (err) |
232 | goto out; |
233 | |
234 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, |
235 | areq_ctx->trailen); |
236 | ahash_request_set_callback(ahreq, aead_request_flags(req) & |
237 | CRYPTO_TFM_REQ_MAY_SLEEP, |
238 | areq_ctx->complete, req); |
239 | |
240 | err = crypto_ahash_finup(ahreq); |
241 | if (err) |
242 | goto out; |
243 | |
244 | authsize = crypto_aead_authsize(authenc_esn); |
245 | cryptlen -= authsize; |
246 | ihash = ahreq->result + authsize; |
247 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
248 | authsize, 0); |
249 | |
250 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
251 | if (err) |
252 | goto out; |
253 | |
254 | abreq = aead_request_ctx(req); |
255 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
256 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
257 | req->base.complete, req->base.data); |
258 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, |
259 | cryptlen, req->iv); |
260 | |
261 | err = crypto_ablkcipher_decrypt(abreq); |
262 | |
263 | out: |
264 | authenc_esn_request_complete(req, err); |
265 | } |
266 | |
267 | static void authenc_esn_verify_ahash_update_done2(struct crypto_async_request *areq, |
268 | int err) |
269 | { |
270 | u8 *ihash; |
271 | unsigned int authsize; |
272 | struct ablkcipher_request *abreq; |
273 | struct aead_request *req = areq->data; |
274 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
275 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
276 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
277 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
278 | unsigned int cryptlen = req->cryptlen; |
279 | |
280 | if (err) |
281 | goto out; |
282 | |
283 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, |
284 | areq_ctx->trailen); |
285 | ahash_request_set_callback(ahreq, aead_request_flags(req) & |
286 | CRYPTO_TFM_REQ_MAY_SLEEP, |
287 | areq_ctx->complete, req); |
288 | |
289 | err = crypto_ahash_finup(ahreq); |
290 | if (err) |
291 | goto out; |
292 | |
293 | authsize = crypto_aead_authsize(authenc_esn); |
294 | cryptlen -= authsize; |
295 | ihash = ahreq->result + authsize; |
296 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
297 | authsize, 0); |
298 | |
299 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
300 | if (err) |
301 | goto out; |
302 | |
303 | abreq = aead_request_ctx(req); |
304 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
305 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
306 | req->base.complete, req->base.data); |
307 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, |
308 | cryptlen, req->iv); |
309 | |
310 | err = crypto_ablkcipher_decrypt(abreq); |
311 | |
312 | out: |
313 | authenc_esn_request_complete(req, err); |
314 | } |
315 | |
316 | |
317 | static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq, |
318 | int err) |
319 | { |
320 | u8 *ihash; |
321 | unsigned int authsize; |
322 | struct ablkcipher_request *abreq; |
323 | struct aead_request *req = areq->data; |
324 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
325 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
326 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
327 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
328 | unsigned int cryptlen = req->cryptlen; |
329 | |
330 | if (err) |
331 | goto out; |
332 | |
333 | authsize = crypto_aead_authsize(authenc_esn); |
334 | cryptlen -= authsize; |
335 | ihash = ahreq->result + authsize; |
336 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
337 | authsize, 0); |
338 | |
339 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
340 | if (err) |
341 | goto out; |
342 | |
343 | abreq = aead_request_ctx(req); |
344 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
345 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
346 | req->base.complete, req->base.data); |
347 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, |
348 | cryptlen, req->iv); |
349 | |
350 | err = crypto_ablkcipher_decrypt(abreq); |
351 | |
352 | out: |
353 | authenc_esn_request_complete(req, err); |
354 | } |
355 | |
356 | static u8 *crypto_authenc_esn_ahash(struct aead_request *req, |
357 | unsigned int flags) |
358 | { |
359 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
360 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
361 | struct crypto_ahash *auth = ctx->auth; |
362 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
363 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
364 | u8 *hash = areq_ctx->tail; |
365 | int err; |
366 | |
367 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
368 | crypto_ahash_alignmask(auth) + 1); |
369 | |
370 | ahash_request_set_tfm(ahreq, auth); |
371 | |
372 | err = crypto_ahash_init(ahreq); |
373 | if (err) |
374 | return ERR_PTR(err); |
375 | |
376 | ahash_request_set_crypt(ahreq, areq_ctx->hsg, hash, areq_ctx->headlen); |
377 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
378 | areq_ctx->update_complete, req); |
379 | |
380 | err = crypto_ahash_update(ahreq); |
381 | if (err) |
382 | return ERR_PTR(err); |
383 | |
384 | ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, areq_ctx->cryptlen); |
385 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
386 | areq_ctx->update_complete2, req); |
387 | |
388 | err = crypto_ahash_update(ahreq); |
389 | if (err) |
390 | return ERR_PTR(err); |
391 | |
392 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, hash, |
393 | areq_ctx->trailen); |
394 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
395 | areq_ctx->complete, req); |
396 | |
397 | err = crypto_ahash_finup(ahreq); |
398 | if (err) |
399 | return ERR_PTR(err); |
400 | |
401 | return hash; |
402 | } |
403 | |
404 | static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv, |
405 | unsigned int flags) |
406 | { |
407 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
408 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
409 | struct scatterlist *dst = req->dst; |
410 | struct scatterlist *assoc = req->assoc; |
411 | struct scatterlist *cipher = areq_ctx->cipher; |
412 | struct scatterlist *hsg = areq_ctx->hsg; |
413 | struct scatterlist *tsg = areq_ctx->tsg; |
414 | struct scatterlist *assoc1; |
415 | struct scatterlist *assoc2; |
416 | unsigned int ivsize = crypto_aead_ivsize(authenc_esn); |
417 | unsigned int cryptlen = req->cryptlen; |
418 | struct page *dstp; |
419 | u8 *vdst; |
420 | u8 *hash; |
421 | |
422 | dstp = sg_page(dst); |
423 | vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; |
424 | |
425 | if (ivsize) { |
426 | sg_init_table(cipher, 2); |
427 | sg_set_buf(cipher, iv, ivsize); |
428 | scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); |
429 | dst = cipher; |
430 | cryptlen += ivsize; |
431 | } |
432 | |
433 | if (sg_is_last(assoc)) |
434 | return -EINVAL; |
435 | |
436 | assoc1 = assoc + 1; |
437 | if (sg_is_last(assoc1)) |
438 | return -EINVAL; |
439 | |
440 | assoc2 = assoc + 2; |
441 | if (!sg_is_last(assoc2)) |
442 | return -EINVAL; |
443 | |
444 | sg_init_table(hsg, 2); |
445 | sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset); |
446 | sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset); |
447 | |
448 | sg_init_table(tsg, 1); |
449 | sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset); |
450 | |
451 | areq_ctx->cryptlen = cryptlen; |
452 | areq_ctx->headlen = assoc->length + assoc2->length; |
453 | areq_ctx->trailen = assoc1->length; |
454 | areq_ctx->sg = dst; |
455 | |
456 | areq_ctx->complete = authenc_esn_geniv_ahash_done; |
457 | areq_ctx->update_complete = authenc_esn_geniv_ahash_update_done; |
458 | areq_ctx->update_complete2 = authenc_esn_geniv_ahash_update_done2; |
459 | |
460 | hash = crypto_authenc_esn_ahash(req, flags); |
461 | if (IS_ERR(hash)) |
462 | return PTR_ERR(hash); |
463 | |
464 | scatterwalk_map_and_copy(hash, dst, cryptlen, |
465 | crypto_aead_authsize(authenc_esn), 1); |
466 | return 0; |
467 | } |
468 | |
469 | |
470 | static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req, |
471 | int err) |
472 | { |
473 | struct aead_request *areq = req->data; |
474 | |
475 | if (!err) { |
476 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(areq); |
477 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
478 | struct ablkcipher_request *abreq = aead_request_ctx(areq); |
479 | u8 *iv = (u8 *)(abreq + 1) + |
480 | crypto_ablkcipher_reqsize(ctx->enc); |
481 | |
482 | err = crypto_authenc_esn_genicv(areq, iv, 0); |
483 | } |
484 | |
485 | authenc_esn_request_complete(areq, err); |
486 | } |
487 | |
488 | static int crypto_authenc_esn_encrypt(struct aead_request *req) |
489 | { |
490 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
491 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
492 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
493 | struct crypto_ablkcipher *enc = ctx->enc; |
494 | struct scatterlist *dst = req->dst; |
495 | unsigned int cryptlen = req->cryptlen; |
496 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail |
497 | + ctx->reqoff); |
498 | u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); |
499 | int err; |
500 | |
501 | ablkcipher_request_set_tfm(abreq, enc); |
502 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
503 | crypto_authenc_esn_encrypt_done, req); |
504 | ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); |
505 | |
506 | memcpy(iv, req->iv, crypto_aead_ivsize(authenc_esn)); |
507 | |
508 | err = crypto_ablkcipher_encrypt(abreq); |
509 | if (err) |
510 | return err; |
511 | |
512 | return crypto_authenc_esn_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
513 | } |
514 | |
515 | static void crypto_authenc_esn_givencrypt_done(struct crypto_async_request *req, |
516 | int err) |
517 | { |
518 | struct aead_request *areq = req->data; |
519 | |
520 | if (!err) { |
521 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
522 | |
523 | err = crypto_authenc_esn_genicv(areq, greq->giv, 0); |
524 | } |
525 | |
526 | authenc_esn_request_complete(areq, err); |
527 | } |
528 | |
529 | static int crypto_authenc_esn_givencrypt(struct aead_givcrypt_request *req) |
530 | { |
531 | struct crypto_aead *authenc_esn = aead_givcrypt_reqtfm(req); |
532 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
533 | struct aead_request *areq = &req->areq; |
534 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
535 | u8 *iv = req->giv; |
536 | int err; |
537 | |
538 | skcipher_givcrypt_set_tfm(greq, ctx->enc); |
539 | skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), |
540 | crypto_authenc_esn_givencrypt_done, areq); |
541 | skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, |
542 | areq->iv); |
543 | skcipher_givcrypt_set_giv(greq, iv, req->seq); |
544 | |
545 | err = crypto_skcipher_givencrypt(greq); |
546 | if (err) |
547 | return err; |
548 | |
549 | return crypto_authenc_esn_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
550 | } |
551 | |
552 | static int crypto_authenc_esn_verify(struct aead_request *req) |
553 | { |
554 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
555 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
556 | u8 *ohash; |
557 | u8 *ihash; |
558 | unsigned int authsize; |
559 | |
560 | areq_ctx->complete = authenc_esn_verify_ahash_done; |
561 | areq_ctx->update_complete = authenc_esn_verify_ahash_update_done; |
562 | |
563 | ohash = crypto_authenc_esn_ahash(req, CRYPTO_TFM_REQ_MAY_SLEEP); |
564 | if (IS_ERR(ohash)) |
565 | return PTR_ERR(ohash); |
566 | |
567 | authsize = crypto_aead_authsize(authenc_esn); |
568 | ihash = ohash + authsize; |
569 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
570 | authsize, 0); |
571 | return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0; |
572 | } |
573 | |
574 | static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv, |
575 | unsigned int cryptlen) |
576 | { |
577 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
578 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
579 | struct scatterlist *src = req->src; |
580 | struct scatterlist *assoc = req->assoc; |
581 | struct scatterlist *cipher = areq_ctx->cipher; |
582 | struct scatterlist *hsg = areq_ctx->hsg; |
583 | struct scatterlist *tsg = areq_ctx->tsg; |
584 | struct scatterlist *assoc1; |
585 | struct scatterlist *assoc2; |
586 | unsigned int ivsize = crypto_aead_ivsize(authenc_esn); |
587 | struct page *srcp; |
588 | u8 *vsrc; |
589 | |
590 | srcp = sg_page(src); |
591 | vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; |
592 | |
593 | if (ivsize) { |
594 | sg_init_table(cipher, 2); |
595 | sg_set_buf(cipher, iv, ivsize); |
596 | scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); |
597 | src = cipher; |
598 | cryptlen += ivsize; |
599 | } |
600 | |
601 | if (sg_is_last(assoc)) |
602 | return -EINVAL; |
603 | |
604 | assoc1 = assoc + 1; |
605 | if (sg_is_last(assoc1)) |
606 | return -EINVAL; |
607 | |
608 | assoc2 = assoc + 2; |
609 | if (!sg_is_last(assoc2)) |
610 | return -EINVAL; |
611 | |
612 | sg_init_table(hsg, 2); |
613 | sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset); |
614 | sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset); |
615 | |
616 | sg_init_table(tsg, 1); |
617 | sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset); |
618 | |
619 | areq_ctx->cryptlen = cryptlen; |
620 | areq_ctx->headlen = assoc->length + assoc2->length; |
621 | areq_ctx->trailen = assoc1->length; |
622 | areq_ctx->sg = src; |
623 | |
624 | areq_ctx->complete = authenc_esn_verify_ahash_done; |
625 | areq_ctx->update_complete = authenc_esn_verify_ahash_update_done; |
626 | areq_ctx->update_complete2 = authenc_esn_verify_ahash_update_done2; |
627 | |
628 | return crypto_authenc_esn_verify(req); |
629 | } |
630 | |
631 | static int crypto_authenc_esn_decrypt(struct aead_request *req) |
632 | { |
633 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
634 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
635 | struct ablkcipher_request *abreq = aead_request_ctx(req); |
636 | unsigned int cryptlen = req->cryptlen; |
637 | unsigned int authsize = crypto_aead_authsize(authenc_esn); |
638 | u8 *iv = req->iv; |
639 | int err; |
640 | |
641 | if (cryptlen < authsize) |
642 | return -EINVAL; |
643 | cryptlen -= authsize; |
644 | |
645 | err = crypto_authenc_esn_iverify(req, iv, cryptlen); |
646 | if (err) |
647 | return err; |
648 | |
649 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
650 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
651 | req->base.complete, req->base.data); |
652 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); |
653 | |
654 | return crypto_ablkcipher_decrypt(abreq); |
655 | } |
656 | |
657 | static int crypto_authenc_esn_init_tfm(struct crypto_tfm *tfm) |
658 | { |
659 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
660 | struct authenc_esn_instance_ctx *ictx = crypto_instance_ctx(inst); |
661 | struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm); |
662 | struct crypto_ahash *auth; |
663 | struct crypto_ablkcipher *enc; |
664 | int err; |
665 | |
666 | auth = crypto_spawn_ahash(&ictx->auth); |
667 | if (IS_ERR(auth)) |
668 | return PTR_ERR(auth); |
669 | |
670 | enc = crypto_spawn_skcipher(&ictx->enc); |
671 | err = PTR_ERR(enc); |
672 | if (IS_ERR(enc)) |
673 | goto err_free_ahash; |
674 | |
675 | ctx->auth = auth; |
676 | ctx->enc = enc; |
677 | |
678 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + |
679 | crypto_ahash_alignmask(auth), |
680 | crypto_ahash_alignmask(auth) + 1) + |
681 | crypto_ablkcipher_ivsize(enc); |
682 | |
683 | tfm->crt_aead.reqsize = sizeof(struct authenc_esn_request_ctx) + |
684 | ctx->reqoff + |
685 | max_t(unsigned int, |
686 | crypto_ahash_reqsize(auth) + |
687 | sizeof(struct ahash_request), |
688 | sizeof(struct skcipher_givcrypt_request) + |
689 | crypto_ablkcipher_reqsize(enc)); |
690 | |
691 | return 0; |
692 | |
693 | err_free_ahash: |
694 | crypto_free_ahash(auth); |
695 | return err; |
696 | } |
697 | |
698 | static void crypto_authenc_esn_exit_tfm(struct crypto_tfm *tfm) |
699 | { |
700 | struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm); |
701 | |
702 | crypto_free_ahash(ctx->auth); |
703 | crypto_free_ablkcipher(ctx->enc); |
704 | } |
705 | |
706 | static struct crypto_instance *crypto_authenc_esn_alloc(struct rtattr **tb) |
707 | { |
708 | struct crypto_attr_type *algt; |
709 | struct crypto_instance *inst; |
710 | struct hash_alg_common *auth; |
711 | struct crypto_alg *auth_base; |
712 | struct crypto_alg *enc; |
713 | struct authenc_esn_instance_ctx *ctx; |
714 | const char *enc_name; |
715 | int err; |
716 | |
717 | algt = crypto_get_attr_type(tb); |
718 | if (IS_ERR(algt)) |
719 | return ERR_CAST(algt); |
720 | |
721 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
722 | return ERR_PTR(-EINVAL); |
723 | |
724 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
725 | CRYPTO_ALG_TYPE_AHASH_MASK); |
726 | if (IS_ERR(auth)) |
727 | return ERR_CAST(auth); |
728 | |
729 | auth_base = &auth->base; |
730 | |
731 | enc_name = crypto_attr_alg_name(tb[2]); |
732 | err = PTR_ERR(enc_name); |
733 | if (IS_ERR(enc_name)) |
734 | goto out_put_auth; |
735 | |
736 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
737 | err = -ENOMEM; |
738 | if (!inst) |
739 | goto out_put_auth; |
740 | |
741 | ctx = crypto_instance_ctx(inst); |
742 | |
743 | err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); |
744 | if (err) |
745 | goto err_free_inst; |
746 | |
747 | crypto_set_skcipher_spawn(&ctx->enc, inst); |
748 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, |
749 | crypto_requires_sync(algt->type, |
750 | algt->mask)); |
751 | if (err) |
752 | goto err_drop_auth; |
753 | |
754 | enc = crypto_skcipher_spawn_alg(&ctx->enc); |
755 | |
756 | err = -ENAMETOOLONG; |
757 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, |
758 | "authencesn(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
759 | CRYPTO_MAX_ALG_NAME) |
760 | goto err_drop_enc; |
761 | |
762 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
763 | "authencesn(%s,%s)", auth_base->cra_driver_name, |
764 | enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
765 | goto err_drop_enc; |
766 | |
767 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
768 | inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; |
769 | inst->alg.cra_priority = enc->cra_priority * |
770 | 10 + auth_base->cra_priority; |
771 | inst->alg.cra_blocksize = enc->cra_blocksize; |
772 | inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; |
773 | inst->alg.cra_type = &crypto_aead_type; |
774 | |
775 | inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; |
776 | inst->alg.cra_aead.maxauthsize = auth->digestsize; |
777 | |
778 | inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx); |
779 | |
780 | inst->alg.cra_init = crypto_authenc_esn_init_tfm; |
781 | inst->alg.cra_exit = crypto_authenc_esn_exit_tfm; |
782 | |
783 | inst->alg.cra_aead.setkey = crypto_authenc_esn_setkey; |
784 | inst->alg.cra_aead.encrypt = crypto_authenc_esn_encrypt; |
785 | inst->alg.cra_aead.decrypt = crypto_authenc_esn_decrypt; |
786 | inst->alg.cra_aead.givencrypt = crypto_authenc_esn_givencrypt; |
787 | |
788 | out: |
789 | crypto_mod_put(auth_base); |
790 | return inst; |
791 | |
792 | err_drop_enc: |
793 | crypto_drop_skcipher(&ctx->enc); |
794 | err_drop_auth: |
795 | crypto_drop_ahash(&ctx->auth); |
796 | err_free_inst: |
797 | kfree(inst); |
798 | out_put_auth: |
799 | inst = ERR_PTR(err); |
800 | goto out; |
801 | } |
802 | |
803 | static void crypto_authenc_esn_free(struct crypto_instance *inst) |
804 | { |
805 | struct authenc_esn_instance_ctx *ctx = crypto_instance_ctx(inst); |
806 | |
807 | crypto_drop_skcipher(&ctx->enc); |
808 | crypto_drop_ahash(&ctx->auth); |
809 | kfree(inst); |
810 | } |
811 | |
812 | static struct crypto_template crypto_authenc_esn_tmpl = { |
813 | .name = "authencesn", |
814 | .alloc = crypto_authenc_esn_alloc, |
815 | .free = crypto_authenc_esn_free, |
816 | .module = THIS_MODULE, |
817 | }; |
818 | |
819 | static int __init crypto_authenc_esn_module_init(void) |
820 | { |
821 | return crypto_register_template(&crypto_authenc_esn_tmpl); |
822 | } |
823 | |
824 | static void __exit crypto_authenc_esn_module_exit(void) |
825 | { |
826 | crypto_unregister_template(&crypto_authenc_esn_tmpl); |
827 | } |
828 | |
829 | module_init(crypto_authenc_esn_module_init); |
830 | module_exit(crypto_authenc_esn_module_exit); |
831 | |
832 | MODULE_LICENSE("GPL"); |
833 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); |
834 | MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers"); |
835 |
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