Commit | Line | Data |
---|---|---|
3c09f17c HX |
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 | ||
e56dd564 | 13 | #include <crypto/aead.h> |
5f7082ed | 14 | #include <crypto/internal/hash.h> |
9ffde35a | 15 | #include <crypto/internal/skcipher.h> |
e236d4a8 | 16 | #include <crypto/authenc.h> |
42c271c6 | 17 | #include <crypto/scatterwalk.h> |
3c09f17c HX |
18 | #include <linux/err.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
e236d4a8 | 22 | #include <linux/rtnetlink.h> |
3c09f17c HX |
23 | #include <linux/slab.h> |
24 | #include <linux/spinlock.h> | |
25 | ||
cbdcf80d SK |
26 | typedef u8 *(*authenc_ahash_t)(struct aead_request *req, unsigned int flags); |
27 | ||
3c09f17c | 28 | struct authenc_instance_ctx { |
cbdcf80d | 29 | struct crypto_ahash_spawn auth; |
9ffde35a | 30 | struct crypto_skcipher_spawn enc; |
3c09f17c HX |
31 | }; |
32 | ||
33 | struct crypto_authenc_ctx { | |
cbdcf80d SK |
34 | unsigned int reqoff; |
35 | struct crypto_ahash *auth; | |
3c09f17c HX |
36 | struct crypto_ablkcipher *enc; |
37 | }; | |
38 | ||
cbdcf80d SK |
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 | ||
180ce7e8 HX |
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 | ||
bc6e2bdb MK |
55 | int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, |
56 | unsigned int keylen) | |
3c09f17c | 57 | { |
bc6e2bdb | 58 | struct rtattr *rta = (struct rtattr *)key; |
e236d4a8 | 59 | struct crypto_authenc_key_param *param; |
3c09f17c | 60 | |
12dc5e62 | 61 | if (!RTA_OK(rta, keylen)) |
bc6e2bdb | 62 | return -EINVAL; |
e236d4a8 | 63 | if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) |
bc6e2bdb | 64 | return -EINVAL; |
e236d4a8 | 65 | if (RTA_PAYLOAD(rta) < sizeof(*param)) |
bc6e2bdb | 66 | return -EINVAL; |
e236d4a8 HX |
67 | |
68 | param = RTA_DATA(rta); | |
bc6e2bdb | 69 | keys->enckeylen = be32_to_cpu(param->enckeylen); |
e236d4a8 HX |
70 | |
71 | key += RTA_ALIGN(rta->rta_len); | |
72 | keylen -= RTA_ALIGN(rta->rta_len); | |
73 | ||
bc6e2bdb MK |
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; | |
e236d4a8 | 80 | |
bc6e2bdb MK |
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; | |
3c09f17c | 96 | |
cbdcf80d SK |
97 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
98 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & | |
3c09f17c | 99 | CRYPTO_TFM_REQ_MASK); |
bc6e2bdb | 100 | err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
cbdcf80d | 101 | crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & |
3c09f17c HX |
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); | |
bc6e2bdb | 110 | err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen); |
3c09f17c HX |
111 | crypto_aead_set_flags(authenc, crypto_ablkcipher_get_flags(enc) & |
112 | CRYPTO_TFM_RES_MASK); | |
113 | ||
114 | out: | |
115 | return err; | |
e236d4a8 HX |
116 | |
117 | badkey: | |
118 | crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
119 | goto out; | |
3c09f17c HX |
120 | } |
121 | ||
cbdcf80d SK |
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: | |
180ce7e8 | 149 | authenc_request_complete(req, err); |
cbdcf80d SK |
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) | |
3c09f17c | 173 | { |
cbdcf80d SK |
174 | u8 *ihash; |
175 | unsigned int authsize; | |
176 | struct ablkcipher_request *abreq; | |
177 | struct aead_request *req = areq->data; | |
3c09f17c | 178 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
3c09f17c | 179 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
cbdcf80d SK |
180 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
181 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
921bae54 | 182 | unsigned int cryptlen = req->cryptlen; |
cbdcf80d SK |
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); | |
921bae54 | 198 | cryptlen -= authsize; |
cbdcf80d SK |
199 | ihash = ahreq->result + authsize; |
200 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
201 | authsize, 0); | |
202 | ||
6bf37e5a | 203 | err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
cbdcf80d SK |
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, | |
921bae54 | 212 | cryptlen, req->iv); |
cbdcf80d SK |
213 | |
214 | err = crypto_ablkcipher_decrypt(abreq); | |
215 | ||
216 | out: | |
180ce7e8 | 217 | authenc_request_complete(req, err); |
cbdcf80d SK |
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); | |
921bae54 | 231 | unsigned int cryptlen = req->cryptlen; |
cbdcf80d SK |
232 | |
233 | if (err) | |
234 | goto out; | |
235 | ||
236 | authsize = crypto_aead_authsize(authenc); | |
921bae54 | 237 | cryptlen -= authsize; |
cbdcf80d SK |
238 | ihash = ahreq->result + authsize; |
239 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
240 | authsize, 0); | |
241 | ||
6bf37e5a | 242 | err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
cbdcf80d SK |
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, | |
921bae54 | 251 | cryptlen, req->iv); |
cbdcf80d SK |
252 | |
253 | err = crypto_ablkcipher_decrypt(abreq); | |
254 | ||
255 | out: | |
180ce7e8 | 256 | authenc_request_complete(req, err); |
cbdcf80d SK |
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; | |
3c09f17c HX |
267 | int err; |
268 | ||
cbdcf80d SK |
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); | |
3c09f17c | 273 | |
cbdcf80d | 274 | err = crypto_ahash_init(ahreq); |
3c09f17c | 275 | if (err) |
cbdcf80d SK |
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); | |
3c09f17c | 281 | |
cbdcf80d | 282 | err = crypto_ahash_update(ahreq); |
3c09f17c | 283 | if (err) |
cbdcf80d SK |
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); | |
3c09f17c | 290 | |
cbdcf80d | 291 | err = crypto_ahash_finup(ahreq); |
3c09f17c | 292 | if (err) |
cbdcf80d | 293 | return ERR_PTR(err); |
3c09f17c | 294 | |
cbdcf80d SK |
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; | |
3c09f17c | 307 | |
cbdcf80d SK |
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); | |
3c09f17c | 318 | if (err) |
7c3d703f HX |
319 | return ERR_PTR(err); |
320 | ||
321 | return hash; | |
322 | } | |
323 | ||
e56dd564 HX |
324 | static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, |
325 | unsigned int flags) | |
7c3d703f HX |
326 | { |
327 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
cbdcf80d | 328 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
7c3d703f | 329 | struct scatterlist *dst = req->dst; |
cbdcf80d SK |
330 | struct scatterlist *assoc = req->assoc; |
331 | struct scatterlist *cipher = areq_ctx->cipher; | |
332 | struct scatterlist *asg = areq_ctx->asg; | |
e56dd564 | 333 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
cbdcf80d SK |
334 | unsigned int cryptlen = req->cryptlen; |
335 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; | |
336 | struct page *dstp; | |
e56dd564 | 337 | u8 *vdst; |
7c3d703f HX |
338 | u8 *hash; |
339 | ||
e56dd564 HX |
340 | dstp = sg_page(dst); |
341 | vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; | |
342 | ||
29b37f42 HX |
343 | if (ivsize) { |
344 | sg_init_table(cipher, 2); | |
345 | sg_set_buf(cipher, iv, ivsize); | |
c920fa60 | 346 | scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); |
29b37f42 | 347 | dst = cipher; |
cbdcf80d | 348 | cryptlen += ivsize; |
29b37f42 | 349 | } |
e56dd564 | 350 | |
9b2f4cb6 | 351 | if (req->assoclen && sg_is_last(assoc)) { |
cbdcf80d SK |
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); | |
c920fa60 | 355 | scatterwalk_crypto_chain(asg, dst, 0, 2); |
cbdcf80d SK |
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); | |
7c3d703f HX |
367 | if (IS_ERR(hash)) |
368 | return PTR_ERR(hash); | |
3c09f17c | 369 | |
29b37f42 | 370 | scatterwalk_map_and_copy(hash, dst, cryptlen, |
7ba683a6 | 371 | crypto_aead_authsize(authenc), 1); |
3c09f17c HX |
372 | return 0; |
373 | } | |
374 | ||
375 | static void crypto_authenc_encrypt_done(struct crypto_async_request *req, | |
376 | int err) | |
377 | { | |
a697690b HX |
378 | struct aead_request *areq = req->data; |
379 | ||
e56dd564 | 380 | if (!err) { |
e56dd564 HX |
381 | struct crypto_aead *authenc = crypto_aead_reqtfm(areq); |
382 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
383 | struct ablkcipher_request *abreq = aead_request_ctx(areq); | |
384 | u8 *iv = (u8 *)(abreq + 1) + | |
385 | crypto_ablkcipher_reqsize(ctx->enc); | |
386 | ||
387 | err = crypto_authenc_genicv(areq, iv, 0); | |
388 | } | |
3c09f17c | 389 | |
180ce7e8 | 390 | authenc_request_complete(areq, err); |
3c09f17c HX |
391 | } |
392 | ||
393 | static int crypto_authenc_encrypt(struct aead_request *req) | |
394 | { | |
395 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
396 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
50beceba | 397 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
e56dd564 HX |
398 | struct crypto_ablkcipher *enc = ctx->enc; |
399 | struct scatterlist *dst = req->dst; | |
400 | unsigned int cryptlen = req->cryptlen; | |
50beceba SK |
401 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail |
402 | + ctx->reqoff); | |
403 | u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); | |
3c09f17c HX |
404 | int err; |
405 | ||
e56dd564 | 406 | ablkcipher_request_set_tfm(abreq, enc); |
3c09f17c HX |
407 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
408 | crypto_authenc_encrypt_done, req); | |
e56dd564 HX |
409 | ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); |
410 | ||
411 | memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); | |
3c09f17c HX |
412 | |
413 | err = crypto_ablkcipher_encrypt(abreq); | |
414 | if (err) | |
415 | return err; | |
416 | ||
e56dd564 HX |
417 | return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
418 | } | |
419 | ||
420 | static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, | |
421 | int err) | |
422 | { | |
a697690b HX |
423 | struct aead_request *areq = req->data; |
424 | ||
e56dd564 | 425 | if (!err) { |
16161329 | 426 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
e56dd564 | 427 | |
16161329 | 428 | err = crypto_authenc_genicv(areq, greq->giv, 0); |
e56dd564 HX |
429 | } |
430 | ||
180ce7e8 | 431 | authenc_request_complete(areq, err); |
e56dd564 HX |
432 | } |
433 | ||
434 | static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) | |
435 | { | |
436 | struct crypto_aead *authenc = aead_givcrypt_reqtfm(req); | |
437 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
438 | struct aead_request *areq = &req->areq; | |
439 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); | |
440 | u8 *iv = req->giv; | |
441 | int err; | |
442 | ||
443 | skcipher_givcrypt_set_tfm(greq, ctx->enc); | |
444 | skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), | |
445 | crypto_authenc_givencrypt_done, areq); | |
446 | skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, | |
447 | areq->iv); | |
448 | skcipher_givcrypt_set_giv(greq, iv, req->seq); | |
449 | ||
450 | err = crypto_skcipher_givencrypt(greq); | |
451 | if (err) | |
452 | return err; | |
453 | ||
454 | return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); | |
3c09f17c HX |
455 | } |
456 | ||
481f34ae | 457 | static int crypto_authenc_verify(struct aead_request *req, |
cbdcf80d | 458 | authenc_ahash_t authenc_ahash_fn) |
3c09f17c HX |
459 | { |
460 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
cbdcf80d | 461 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
7c3d703f | 462 | u8 *ohash; |
3c09f17c | 463 | u8 *ihash; |
3c09f17c | 464 | unsigned int authsize; |
3c09f17c | 465 | |
cbdcf80d | 466 | areq_ctx->complete = authenc_verify_ahash_done; |
77ba115c | 467 | areq_ctx->update_complete = authenc_verify_ahash_update_done; |
cbdcf80d SK |
468 | |
469 | ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); | |
7c3d703f HX |
470 | if (IS_ERR(ohash)) |
471 | return PTR_ERR(ohash); | |
3c09f17c | 472 | |
7ba683a6 | 473 | authsize = crypto_aead_authsize(authenc); |
7c3d703f | 474 | ihash = ohash + authsize; |
cbdcf80d SK |
475 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
476 | authsize, 0); | |
6bf37e5a | 477 | return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0; |
3c09f17c HX |
478 | } |
479 | ||
e56dd564 HX |
480 | static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, |
481 | unsigned int cryptlen) | |
3c09f17c | 482 | { |
e56dd564 | 483 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
cbdcf80d | 484 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
e56dd564 | 485 | struct scatterlist *src = req->src; |
cbdcf80d SK |
486 | struct scatterlist *assoc = req->assoc; |
487 | struct scatterlist *cipher = areq_ctx->cipher; | |
488 | struct scatterlist *asg = areq_ctx->asg; | |
e56dd564 | 489 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
cbdcf80d SK |
490 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
491 | struct page *srcp; | |
e56dd564 HX |
492 | u8 *vsrc; |
493 | ||
494 | srcp = sg_page(src); | |
495 | vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; | |
496 | ||
29b37f42 HX |
497 | if (ivsize) { |
498 | sg_init_table(cipher, 2); | |
499 | sg_set_buf(cipher, iv, ivsize); | |
c920fa60 | 500 | scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); |
29b37f42 | 501 | src = cipher; |
cbdcf80d SK |
502 | cryptlen += ivsize; |
503 | } | |
504 | ||
9b2f4cb6 | 505 | if (req->assoclen && sg_is_last(assoc)) { |
cbdcf80d SK |
506 | authenc_ahash_fn = crypto_authenc_ahash; |
507 | sg_init_table(asg, 2); | |
508 | sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); | |
c920fa60 | 509 | scatterwalk_crypto_chain(asg, src, 0, 2); |
cbdcf80d SK |
510 | src = asg; |
511 | cryptlen += req->assoclen; | |
29b37f42 | 512 | } |
e56dd564 | 513 | |
cbdcf80d SK |
514 | areq_ctx->cryptlen = cryptlen; |
515 | areq_ctx->sg = src; | |
516 | ||
517 | return crypto_authenc_verify(req, authenc_ahash_fn); | |
3c09f17c HX |
518 | } |
519 | ||
520 | static int crypto_authenc_decrypt(struct aead_request *req) | |
521 | { | |
522 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
523 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
524 | struct ablkcipher_request *abreq = aead_request_ctx(req); | |
481f34ae HX |
525 | unsigned int cryptlen = req->cryptlen; |
526 | unsigned int authsize = crypto_aead_authsize(authenc); | |
e56dd564 | 527 | u8 *iv = req->iv; |
3c09f17c HX |
528 | int err; |
529 | ||
481f34ae HX |
530 | if (cryptlen < authsize) |
531 | return -EINVAL; | |
532 | cryptlen -= authsize; | |
533 | ||
e56dd564 | 534 | err = crypto_authenc_iverify(req, iv, cryptlen); |
3c09f17c HX |
535 | if (err) |
536 | return err; | |
537 | ||
538 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
539 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
e56dd564 HX |
540 | req->base.complete, req->base.data); |
541 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); | |
3c09f17c HX |
542 | |
543 | return crypto_ablkcipher_decrypt(abreq); | |
544 | } | |
545 | ||
546 | static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) | |
547 | { | |
cbdcf80d | 548 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
3c09f17c HX |
549 | struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); |
550 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); | |
cbdcf80d | 551 | struct crypto_ahash *auth; |
3c09f17c | 552 | struct crypto_ablkcipher *enc; |
3c09f17c HX |
553 | int err; |
554 | ||
cbdcf80d | 555 | auth = crypto_spawn_ahash(&ictx->auth); |
3c09f17c HX |
556 | if (IS_ERR(auth)) |
557 | return PTR_ERR(auth); | |
558 | ||
9ffde35a | 559 | enc = crypto_spawn_skcipher(&ictx->enc); |
3c09f17c HX |
560 | err = PTR_ERR(enc); |
561 | if (IS_ERR(enc)) | |
cbdcf80d | 562 | goto err_free_ahash; |
3c09f17c HX |
563 | |
564 | ctx->auth = auth; | |
565 | ctx->enc = enc; | |
f3542e6d | 566 | |
50beceba SK |
567 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + |
568 | crypto_ahash_alignmask(auth), | |
569 | crypto_ahash_alignmask(auth) + 1) + | |
570 | crypto_ablkcipher_ivsize(enc); | |
571 | ||
572 | tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) + | |
573 | ctx->reqoff + | |
574 | max_t(unsigned int, | |
575 | crypto_ahash_reqsize(auth) + | |
f3542e6d | 576 | sizeof(struct ahash_request), |
cbdcf80d | 577 | sizeof(struct skcipher_givcrypt_request) + |
50beceba | 578 | crypto_ablkcipher_reqsize(enc)); |
3c09f17c HX |
579 | |
580 | return 0; | |
581 | ||
cbdcf80d SK |
582 | err_free_ahash: |
583 | crypto_free_ahash(auth); | |
3c09f17c HX |
584 | return err; |
585 | } | |
586 | ||
587 | static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) | |
588 | { | |
589 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); | |
590 | ||
cbdcf80d | 591 | crypto_free_ahash(ctx->auth); |
3c09f17c HX |
592 | crypto_free_ablkcipher(ctx->enc); |
593 | } | |
594 | ||
595 | static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) | |
596 | { | |
9ffde35a | 597 | struct crypto_attr_type *algt; |
3c09f17c | 598 | struct crypto_instance *inst; |
cbdcf80d SK |
599 | struct hash_alg_common *auth; |
600 | struct crypto_alg *auth_base; | |
3c09f17c HX |
601 | struct crypto_alg *enc; |
602 | struct authenc_instance_ctx *ctx; | |
9ffde35a | 603 | const char *enc_name; |
3c09f17c HX |
604 | int err; |
605 | ||
9ffde35a | 606 | algt = crypto_get_attr_type(tb); |
9ffde35a | 607 | if (IS_ERR(algt)) |
3e8afe35 | 608 | return ERR_CAST(algt); |
3c09f17c | 609 | |
9ffde35a HX |
610 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
611 | return ERR_PTR(-EINVAL); | |
612 | ||
cbdcf80d SK |
613 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
614 | CRYPTO_ALG_TYPE_AHASH_MASK); | |
3c09f17c | 615 | if (IS_ERR(auth)) |
8db05078 | 616 | return ERR_CAST(auth); |
3c09f17c | 617 | |
cbdcf80d SK |
618 | auth_base = &auth->base; |
619 | ||
9ffde35a HX |
620 | enc_name = crypto_attr_alg_name(tb[2]); |
621 | err = PTR_ERR(enc_name); | |
622 | if (IS_ERR(enc_name)) | |
3c09f17c HX |
623 | goto out_put_auth; |
624 | ||
3c09f17c HX |
625 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
626 | err = -ENOMEM; | |
627 | if (!inst) | |
9ffde35a | 628 | goto out_put_auth; |
3c09f17c HX |
629 | |
630 | ctx = crypto_instance_ctx(inst); | |
3c09f17c | 631 | |
cbdcf80d | 632 | err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); |
3c09f17c HX |
633 | if (err) |
634 | goto err_free_inst; | |
635 | ||
9ffde35a HX |
636 | crypto_set_skcipher_spawn(&ctx->enc, inst); |
637 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, | |
638 | crypto_requires_sync(algt->type, | |
639 | algt->mask)); | |
3c09f17c HX |
640 | if (err) |
641 | goto err_drop_auth; | |
642 | ||
9ffde35a HX |
643 | enc = crypto_skcipher_spawn_alg(&ctx->enc); |
644 | ||
645 | err = -ENAMETOOLONG; | |
646 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
cbdcf80d | 647 | "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
9ffde35a HX |
648 | CRYPTO_MAX_ALG_NAME) |
649 | goto err_drop_enc; | |
650 | ||
651 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
cbdcf80d | 652 | "authenc(%s,%s)", auth_base->cra_driver_name, |
9ffde35a HX |
653 | enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
654 | goto err_drop_enc; | |
655 | ||
656 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; | |
657 | inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; | |
cbdcf80d SK |
658 | inst->alg.cra_priority = enc->cra_priority * |
659 | 10 + auth_base->cra_priority; | |
3c09f17c | 660 | inst->alg.cra_blocksize = enc->cra_blocksize; |
cbdcf80d | 661 | inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; |
3c09f17c HX |
662 | inst->alg.cra_type = &crypto_aead_type; |
663 | ||
c2c61f51 | 664 | inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; |
cbdcf80d | 665 | inst->alg.cra_aead.maxauthsize = auth->digestsize; |
3c09f17c HX |
666 | |
667 | inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx); | |
668 | ||
669 | inst->alg.cra_init = crypto_authenc_init_tfm; | |
670 | inst->alg.cra_exit = crypto_authenc_exit_tfm; | |
671 | ||
672 | inst->alg.cra_aead.setkey = crypto_authenc_setkey; | |
673 | inst->alg.cra_aead.encrypt = crypto_authenc_encrypt; | |
674 | inst->alg.cra_aead.decrypt = crypto_authenc_decrypt; | |
e56dd564 | 675 | inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; |
3c09f17c HX |
676 | |
677 | out: | |
cbdcf80d | 678 | crypto_mod_put(auth_base); |
3c09f17c HX |
679 | return inst; |
680 | ||
9ffde35a HX |
681 | err_drop_enc: |
682 | crypto_drop_skcipher(&ctx->enc); | |
3c09f17c | 683 | err_drop_auth: |
cbdcf80d | 684 | crypto_drop_ahash(&ctx->auth); |
3c09f17c HX |
685 | err_free_inst: |
686 | kfree(inst); | |
9ffde35a | 687 | out_put_auth: |
3c09f17c HX |
688 | inst = ERR_PTR(err); |
689 | goto out; | |
690 | } | |
691 | ||
692 | static void crypto_authenc_free(struct crypto_instance *inst) | |
693 | { | |
694 | struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); | |
695 | ||
9ffde35a | 696 | crypto_drop_skcipher(&ctx->enc); |
cbdcf80d | 697 | crypto_drop_ahash(&ctx->auth); |
3c09f17c HX |
698 | kfree(inst); |
699 | } | |
700 | ||
701 | static struct crypto_template crypto_authenc_tmpl = { | |
702 | .name = "authenc", | |
703 | .alloc = crypto_authenc_alloc, | |
704 | .free = crypto_authenc_free, | |
705 | .module = THIS_MODULE, | |
706 | }; | |
707 | ||
708 | static int __init crypto_authenc_module_init(void) | |
709 | { | |
710 | return crypto_register_template(&crypto_authenc_tmpl); | |
711 | } | |
712 | ||
713 | static void __exit crypto_authenc_module_exit(void) | |
714 | { | |
715 | crypto_unregister_template(&crypto_authenc_tmpl); | |
716 | } | |
717 | ||
718 | module_init(crypto_authenc_module_init); | |
719 | module_exit(crypto_authenc_module_exit); | |
720 | ||
721 | MODULE_LICENSE("GPL"); | |
722 | MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); |