Root/
1 | /* |
2 | * Authenc: Simple AEAD wrapper for IPsec |
3 | * |
4 | * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it |
7 | * under the terms of the GNU General Public License as published by the Free |
8 | * Software Foundation; either version 2 of the License, or (at your option) |
9 | * any later version. |
10 | * |
11 | */ |
12 | |
13 | #include <crypto/aead.h> |
14 | #include <crypto/internal/hash.h> |
15 | #include <crypto/internal/skcipher.h> |
16 | #include <crypto/authenc.h> |
17 | #include <crypto/scatterwalk.h> |
18 | #include <linux/err.h> |
19 | #include <linux/init.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/module.h> |
22 | #include <linux/rtnetlink.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/spinlock.h> |
25 | |
26 | typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags); |
27 | |
28 | struct authenc_instance_ctx { |
29 | struct crypto_ahash_spawn auth; |
30 | struct crypto_skcipher_spawn enc; |
31 | }; |
32 | |
33 | struct crypto_authenc_ctx { |
34 | unsigned int reqoff; |
35 | struct crypto_ahash *auth; |
36 | struct crypto_ablkcipher *enc; |
37 | }; |
38 | |
39 | struct authenc_request_ctx { |
40 | unsigned int cryptlen; |
41 | struct scatterlist *sg; |
42 | struct scatterlist asg[2]; |
43 | struct scatterlist cipher[2]; |
44 | crypto_completion_t complete; |
45 | crypto_completion_t update_complete; |
46 | char tail[]; |
47 | }; |
48 | |
49 | static void authenc_request_complete(struct aead_request *req, int err) |
50 | { |
51 | if (err != -EINPROGRESS) |
52 | aead_request_complete(req, err); |
53 | } |
54 | |
55 | static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, |
56 | unsigned int keylen) |
57 | { |
58 | unsigned int authkeylen; |
59 | unsigned int enckeylen; |
60 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
61 | struct crypto_ahash *auth = ctx->auth; |
62 | struct crypto_ablkcipher *enc = ctx->enc; |
63 | struct rtattr *rta = (void *)key; |
64 | struct crypto_authenc_key_param *param; |
65 | int err = -EINVAL; |
66 | |
67 | if (!RTA_OK(rta, keylen)) |
68 | goto badkey; |
69 | if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) |
70 | goto badkey; |
71 | if (RTA_PAYLOAD(rta) < sizeof(*param)) |
72 | goto badkey; |
73 | |
74 | param = RTA_DATA(rta); |
75 | enckeylen = be32_to_cpu(param->enckeylen); |
76 | |
77 | key += RTA_ALIGN(rta->rta_len); |
78 | keylen -= RTA_ALIGN(rta->rta_len); |
79 | |
80 | if (keylen < enckeylen) |
81 | goto badkey; |
82 | |
83 | authkeylen = keylen - enckeylen; |
84 | |
85 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
86 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & |
87 | CRYPTO_TFM_REQ_MASK); |
88 | err = crypto_ahash_setkey(auth, key, authkeylen); |
89 | crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & |
90 | CRYPTO_TFM_RES_MASK); |
91 | |
92 | if (err) |
93 | goto out; |
94 | |
95 | crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); |
96 | crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc) & |
97 | CRYPTO_TFM_REQ_MASK); |
98 | err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen); |
99 | crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) & |
100 | CRYPTO_TFM_RES_MASK); |
101 | |
102 | out: |
103 | return err; |
104 | |
105 | badkey: |
106 | crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); |
107 | goto out; |
108 | } |
109 | |
110 | static void authenc_chain(struct scatterlist *head, struct scatterlist *sg, |
111 | int chain) |
112 | { |
113 | if (chain) { |
114 | head->length += sg->length; |
115 | sg = scatterwalk_sg_next(sg); |
116 | } |
117 | |
118 | if (sg) |
119 | scatterwalk_sg_chain(head, 2, sg); |
120 | else |
121 | sg_mark_end(head); |
122 | } |
123 | |
124 | static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq, |
125 | int err) |
126 | { |
127 | struct aead_request *req = areq->data; |
128 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
129 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
130 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
131 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
132 | |
133 | if (err) |
134 | goto out; |
135 | |
136 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, |
137 | areq_ctx->cryptlen); |
138 | ahash_request_set_callback(ahreq, aead_request_flags(req) & |
139 | CRYPTO_TFM_REQ_MAY_SLEEP, |
140 | areq_ctx->complete, req); |
141 | |
142 | err = crypto_ahash_finup(ahreq); |
143 | if (err) |
144 | goto out; |
145 | |
146 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, |
147 | areq_ctx->cryptlen, |
148 | crypto_aead_authsize(authenc), 1); |
149 | |
150 | out: |
151 | authenc_request_complete(req, err); |
152 | } |
153 | |
154 | static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err) |
155 | { |
156 | struct aead_request *req = areq->data; |
157 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
158 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
159 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
160 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
161 | |
162 | if (err) |
163 | goto out; |
164 | |
165 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, |
166 | areq_ctx->cryptlen, |
167 | crypto_aead_authsize(authenc), 1); |
168 | |
169 | out: |
170 | aead_request_complete(req, err); |
171 | } |
172 | |
173 | static void authenc_verify_ahash_update_done(struct crypto_async_request *areq, |
174 | int err) |
175 | { |
176 | u8 *ihash; |
177 | unsigned int authsize; |
178 | struct ablkcipher_request *abreq; |
179 | struct aead_request *req = areq->data; |
180 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
181 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
182 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
183 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
184 | |
185 | if (err) |
186 | goto out; |
187 | |
188 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, |
189 | areq_ctx->cryptlen); |
190 | ahash_request_set_callback(ahreq, aead_request_flags(req) & |
191 | CRYPTO_TFM_REQ_MAY_SLEEP, |
192 | areq_ctx->complete, req); |
193 | |
194 | err = crypto_ahash_finup(ahreq); |
195 | if (err) |
196 | goto out; |
197 | |
198 | authsize = crypto_aead_authsize(authenc); |
199 | ihash = ahreq->result + authsize; |
200 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
201 | authsize, 0); |
202 | |
203 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
204 | if (err) |
205 | goto out; |
206 | |
207 | abreq = aead_request_ctx(req); |
208 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
209 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
210 | req->base.complete, req->base.data); |
211 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, |
212 | req->cryptlen, req->iv); |
213 | |
214 | err = crypto_ablkcipher_decrypt(abreq); |
215 | |
216 | out: |
217 | authenc_request_complete(req, err); |
218 | } |
219 | |
220 | static void authenc_verify_ahash_done(struct crypto_async_request *areq, |
221 | int err) |
222 | { |
223 | u8 *ihash; |
224 | unsigned int authsize; |
225 | struct ablkcipher_request *abreq; |
226 | struct aead_request *req = areq->data; |
227 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
228 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
229 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
230 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
231 | |
232 | if (err) |
233 | goto out; |
234 | |
235 | authsize = crypto_aead_authsize(authenc); |
236 | ihash = ahreq->result + authsize; |
237 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
238 | authsize, 0); |
239 | |
240 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
241 | if (err) |
242 | goto out; |
243 | |
244 | abreq = aead_request_ctx(req); |
245 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
246 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
247 | req->base.complete, req->base.data); |
248 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, |
249 | req->cryptlen, req->iv); |
250 | |
251 | err = crypto_ablkcipher_decrypt(abreq); |
252 | |
253 | out: |
254 | authenc_request_complete(req, err); |
255 | } |
256 | |
257 | static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags) |
258 | { |
259 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
260 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
261 | struct crypto_ahash *auth = ctx->auth; |
262 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
263 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
264 | u8 *hash = areq_ctx->tail; |
265 | int err; |
266 | |
267 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
268 | crypto_ahash_alignmask(auth) + 1); |
269 | |
270 | ahash_request_set_tfm(ahreq, auth); |
271 | |
272 | err = crypto_ahash_init(ahreq); |
273 | if (err) |
274 | return ERR_PTR(err); |
275 | |
276 | ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen); |
277 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
278 | areq_ctx->update_complete, req); |
279 | |
280 | err = crypto_ahash_update(ahreq); |
281 | if (err) |
282 | return ERR_PTR(err); |
283 | |
284 | ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, |
285 | areq_ctx->cryptlen); |
286 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
287 | areq_ctx->complete, req); |
288 | |
289 | err = crypto_ahash_finup(ahreq); |
290 | if (err) |
291 | return ERR_PTR(err); |
292 | |
293 | return hash; |
294 | } |
295 | |
296 | static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags) |
297 | { |
298 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
299 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
300 | struct crypto_ahash *auth = ctx->auth; |
301 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
302 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
303 | u8 *hash = areq_ctx->tail; |
304 | int err; |
305 | |
306 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
307 | crypto_ahash_alignmask(auth) + 1); |
308 | |
309 | ahash_request_set_tfm(ahreq, auth); |
310 | ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, |
311 | areq_ctx->cryptlen); |
312 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, |
313 | areq_ctx->complete, req); |
314 | |
315 | err = crypto_ahash_digest(ahreq); |
316 | if (err) |
317 | return ERR_PTR(err); |
318 | |
319 | return hash; |
320 | } |
321 | |
322 | static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, |
323 | unsigned int flags) |
324 | { |
325 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
326 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
327 | struct scatterlist *dst = req->dst; |
328 | struct scatterlist *assoc = req->assoc; |
329 | struct scatterlist *cipher = areq_ctx->cipher; |
330 | struct scatterlist *asg = areq_ctx->asg; |
331 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
332 | unsigned int cryptlen = req->cryptlen; |
333 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
334 | struct page *dstp; |
335 | u8 *vdst; |
336 | u8 *hash; |
337 | |
338 | dstp = sg_page(dst); |
339 | vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; |
340 | |
341 | if (ivsize) { |
342 | sg_init_table(cipher, 2); |
343 | sg_set_buf(cipher, iv, ivsize); |
344 | authenc_chain(cipher, dst, vdst == iv + ivsize); |
345 | dst = cipher; |
346 | cryptlen += ivsize; |
347 | } |
348 | |
349 | if (sg_is_last(assoc)) { |
350 | authenc_ahash_fn = crypto_authenc_ahash; |
351 | sg_init_table(asg, 2); |
352 | sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); |
353 | authenc_chain(asg, dst, 0); |
354 | dst = asg; |
355 | cryptlen += req->assoclen; |
356 | } |
357 | |
358 | areq_ctx->cryptlen = cryptlen; |
359 | areq_ctx->sg = dst; |
360 | |
361 | areq_ctx->complete = authenc_geniv_ahash_done; |
362 | areq_ctx->update_complete = authenc_geniv_ahash_update_done; |
363 | |
364 | hash = authenc_ahash_fn(req, flags); |
365 | if (IS_ERR(hash)) |
366 | return PTR_ERR(hash); |
367 | |
368 | scatterwalk_map_and_copy(hash, dst, cryptlen, |
369 | crypto_aead_authsize(authenc), 1); |
370 | return 0; |
371 | } |
372 | |
373 | static void crypto_authenc_encrypt_done(struct crypto_async_request *req, |
374 | int err) |
375 | { |
376 | struct aead_request *areq = req->data; |
377 | |
378 | if (!err) { |
379 | struct crypto_aead *authenc = crypto_aead_reqtfm(areq); |
380 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
381 | struct ablkcipher_request *abreq = aead_request_ctx(areq); |
382 | u8 *iv = (u8 *)(abreq + 1) + |
383 | crypto_ablkcipher_reqsize(ctx->enc); |
384 | |
385 | err = crypto_authenc_genicv(areq, iv, 0); |
386 | } |
387 | |
388 | authenc_request_complete(areq, err); |
389 | } |
390 | |
391 | static int crypto_authenc_encrypt(struct aead_request *req) |
392 | { |
393 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
394 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
395 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
396 | struct crypto_ablkcipher *enc = ctx->enc; |
397 | struct scatterlist *dst = req->dst; |
398 | unsigned int cryptlen = req->cryptlen; |
399 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail |
400 | + ctx->reqoff); |
401 | u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); |
402 | int err; |
403 | |
404 | ablkcipher_request_set_tfm(abreq, enc); |
405 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
406 | crypto_authenc_encrypt_done, req); |
407 | ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); |
408 | |
409 | memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); |
410 | |
411 | err = crypto_ablkcipher_encrypt(abreq); |
412 | if (err) |
413 | return err; |
414 | |
415 | return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
416 | } |
417 | |
418 | static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, |
419 | int err) |
420 | { |
421 | struct aead_request *areq = req->data; |
422 | |
423 | if (!err) { |
424 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
425 | |
426 | err = crypto_authenc_genicv(areq, greq->giv, 0); |
427 | } |
428 | |
429 | authenc_request_complete(areq, err); |
430 | } |
431 | |
432 | static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) |
433 | { |
434 | struct crypto_aead *authenc = aead_givcrypt_reqtfm(req); |
435 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
436 | struct aead_request *areq = &req->areq; |
437 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
438 | u8 *iv = req->giv; |
439 | int err; |
440 | |
441 | skcipher_givcrypt_set_tfm(greq, ctx->enc); |
442 | skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), |
443 | crypto_authenc_givencrypt_done, areq); |
444 | skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, |
445 | areq->iv); |
446 | skcipher_givcrypt_set_giv(greq, iv, req->seq); |
447 | |
448 | err = crypto_skcipher_givencrypt(greq); |
449 | if (err) |
450 | return err; |
451 | |
452 | return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
453 | } |
454 | |
455 | static int crypto_authenc_verify(struct aead_request *req, |
456 | authenc_ahash_t authenc_ahash_fn) |
457 | { |
458 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
459 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
460 | u8 *ohash; |
461 | u8 *ihash; |
462 | unsigned int authsize; |
463 | |
464 | areq_ctx->complete = authenc_verify_ahash_done; |
465 | areq_ctx->update_complete = authenc_verify_ahash_update_done; |
466 | |
467 | ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); |
468 | if (IS_ERR(ohash)) |
469 | return PTR_ERR(ohash); |
470 | |
471 | authsize = crypto_aead_authsize(authenc); |
472 | ihash = ohash + authsize; |
473 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
474 | authsize, 0); |
475 | return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0; |
476 | } |
477 | |
478 | static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, |
479 | unsigned int cryptlen) |
480 | { |
481 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
482 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
483 | struct scatterlist *src = req->src; |
484 | struct scatterlist *assoc = req->assoc; |
485 | struct scatterlist *cipher = areq_ctx->cipher; |
486 | struct scatterlist *asg = areq_ctx->asg; |
487 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
488 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
489 | struct page *srcp; |
490 | u8 *vsrc; |
491 | |
492 | srcp = sg_page(src); |
493 | vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; |
494 | |
495 | if (ivsize) { |
496 | sg_init_table(cipher, 2); |
497 | sg_set_buf(cipher, iv, ivsize); |
498 | authenc_chain(cipher, src, vsrc == iv + ivsize); |
499 | src = cipher; |
500 | cryptlen += ivsize; |
501 | } |
502 | |
503 | if (sg_is_last(assoc)) { |
504 | authenc_ahash_fn = crypto_authenc_ahash; |
505 | sg_init_table(asg, 2); |
506 | sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); |
507 | authenc_chain(asg, src, 0); |
508 | src = asg; |
509 | cryptlen += req->assoclen; |
510 | } |
511 | |
512 | areq_ctx->cryptlen = cryptlen; |
513 | areq_ctx->sg = src; |
514 | |
515 | return crypto_authenc_verify(req, authenc_ahash_fn); |
516 | } |
517 | |
518 | static int crypto_authenc_decrypt(struct aead_request *req) |
519 | { |
520 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
521 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
522 | struct ablkcipher_request *abreq = aead_request_ctx(req); |
523 | unsigned int cryptlen = req->cryptlen; |
524 | unsigned int authsize = crypto_aead_authsize(authenc); |
525 | u8 *iv = req->iv; |
526 | int err; |
527 | |
528 | if (cryptlen < authsize) |
529 | return -EINVAL; |
530 | cryptlen -= authsize; |
531 | |
532 | err = crypto_authenc_iverify(req, iv, cryptlen); |
533 | if (err) |
534 | return err; |
535 | |
536 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
537 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
538 | req->base.complete, req->base.data); |
539 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); |
540 | |
541 | return crypto_ablkcipher_decrypt(abreq); |
542 | } |
543 | |
544 | static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) |
545 | { |
546 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
547 | struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); |
548 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); |
549 | struct crypto_ahash *auth; |
550 | struct crypto_ablkcipher *enc; |
551 | int err; |
552 | |
553 | auth = crypto_spawn_ahash(&ictx->auth); |
554 | if (IS_ERR(auth)) |
555 | return PTR_ERR(auth); |
556 | |
557 | enc = crypto_spawn_skcipher(&ictx->enc); |
558 | err = PTR_ERR(enc); |
559 | if (IS_ERR(enc)) |
560 | goto err_free_ahash; |
561 | |
562 | ctx->auth = auth; |
563 | ctx->enc = enc; |
564 | |
565 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + |
566 | crypto_ahash_alignmask(auth), |
567 | crypto_ahash_alignmask(auth) + 1) + |
568 | crypto_ablkcipher_ivsize(enc); |
569 | |
570 | tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) + |
571 | ctx->reqoff + |
572 | max_t(unsigned int, |
573 | crypto_ahash_reqsize(auth) + |
574 | sizeof(struct ahash_request), |
575 | sizeof(struct skcipher_givcrypt_request) + |
576 | crypto_ablkcipher_reqsize(enc)); |
577 | |
578 | return 0; |
579 | |
580 | err_free_ahash: |
581 | crypto_free_ahash(auth); |
582 | return err; |
583 | } |
584 | |
585 | static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) |
586 | { |
587 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); |
588 | |
589 | crypto_free_ahash(ctx->auth); |
590 | crypto_free_ablkcipher(ctx->enc); |
591 | } |
592 | |
593 | static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) |
594 | { |
595 | struct crypto_attr_type *algt; |
596 | struct crypto_instance *inst; |
597 | struct hash_alg_common *auth; |
598 | struct crypto_alg *auth_base; |
599 | struct crypto_alg *enc; |
600 | struct authenc_instance_ctx *ctx; |
601 | const char *enc_name; |
602 | int err; |
603 | |
604 | algt = crypto_get_attr_type(tb); |
605 | err = PTR_ERR(algt); |
606 | if (IS_ERR(algt)) |
607 | return ERR_PTR(err); |
608 | |
609 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
610 | return ERR_PTR(-EINVAL); |
611 | |
612 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
613 | CRYPTO_ALG_TYPE_AHASH_MASK); |
614 | if (IS_ERR(auth)) |
615 | return ERR_PTR(PTR_ERR(auth)); |
616 | |
617 | auth_base = &auth->base; |
618 | |
619 | enc_name = crypto_attr_alg_name(tb[2]); |
620 | err = PTR_ERR(enc_name); |
621 | if (IS_ERR(enc_name)) |
622 | goto out_put_auth; |
623 | |
624 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
625 | err = -ENOMEM; |
626 | if (!inst) |
627 | goto out_put_auth; |
628 | |
629 | ctx = crypto_instance_ctx(inst); |
630 | |
631 | err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); |
632 | if (err) |
633 | goto err_free_inst; |
634 | |
635 | crypto_set_skcipher_spawn(&ctx->enc, inst); |
636 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, |
637 | crypto_requires_sync(algt->type, |
638 | algt->mask)); |
639 | if (err) |
640 | goto err_drop_auth; |
641 | |
642 | enc = crypto_skcipher_spawn_alg(&ctx->enc); |
643 | |
644 | err = -ENAMETOOLONG; |
645 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, |
646 | "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
647 | CRYPTO_MAX_ALG_NAME) |
648 | goto err_drop_enc; |
649 | |
650 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
651 | "authenc(%s,%s)", auth_base->cra_driver_name, |
652 | enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
653 | goto err_drop_enc; |
654 | |
655 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; |
656 | inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; |
657 | inst->alg.cra_priority = enc->cra_priority * |
658 | 10 + auth_base->cra_priority; |
659 | inst->alg.cra_blocksize = enc->cra_blocksize; |
660 | inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; |
661 | inst->alg.cra_type = &crypto_aead_type; |
662 | |
663 | inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; |
664 | inst->alg.cra_aead.maxauthsize = auth->digestsize; |
665 | |
666 | inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx); |
667 | |
668 | inst->alg.cra_init = crypto_authenc_init_tfm; |
669 | inst->alg.cra_exit = crypto_authenc_exit_tfm; |
670 | |
671 | inst->alg.cra_aead.setkey = crypto_authenc_setkey; |
672 | inst->alg.cra_aead.encrypt = crypto_authenc_encrypt; |
673 | inst->alg.cra_aead.decrypt = crypto_authenc_decrypt; |
674 | inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; |
675 | |
676 | out: |
677 | crypto_mod_put(auth_base); |
678 | return inst; |
679 | |
680 | err_drop_enc: |
681 | crypto_drop_skcipher(&ctx->enc); |
682 | err_drop_auth: |
683 | crypto_drop_ahash(&ctx->auth); |
684 | err_free_inst: |
685 | kfree(inst); |
686 | out_put_auth: |
687 | inst = ERR_PTR(err); |
688 | goto out; |
689 | } |
690 | |
691 | static void crypto_authenc_free(struct crypto_instance *inst) |
692 | { |
693 | struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); |
694 | |
695 | crypto_drop_skcipher(&ctx->enc); |
696 | crypto_drop_ahash(&ctx->auth); |
697 | kfree(inst); |
698 | } |
699 | |
700 | static struct crypto_template crypto_authenc_tmpl = { |
701 | .name = "authenc", |
702 | .alloc = crypto_authenc_alloc, |
703 | .free = crypto_authenc_free, |
704 | .module = THIS_MODULE, |
705 | }; |
706 | |
707 | static int __init crypto_authenc_module_init(void) |
708 | { |
709 | return crypto_register_template(&crypto_authenc_tmpl); |
710 | } |
711 | |
712 | static void __exit crypto_authenc_module_exit(void) |
713 | { |
714 | crypto_unregister_template(&crypto_authenc_tmpl); |
715 | } |
716 | |
717 | module_init(crypto_authenc_module_init); |
718 | module_exit(crypto_authenc_module_exit); |
719 | |
720 | MODULE_LICENSE("GPL"); |
721 | MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); |
722 |
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v2.6.34-rc5
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