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