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 | ||
3c09f17c HX |
55 | static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, |
56 | unsigned int keylen) | |
57 | { | |
3c09f17c | 58 | unsigned int authkeylen; |
e236d4a8 | 59 | unsigned int enckeylen; |
3c09f17c | 60 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
cbdcf80d | 61 | struct crypto_ahash *auth = ctx->auth; |
3c09f17c | 62 | struct crypto_ablkcipher *enc = ctx->enc; |
e236d4a8 HX |
63 | struct rtattr *rta = (void *)key; |
64 | struct crypto_authenc_key_param *param; | |
3c09f17c HX |
65 | int err = -EINVAL; |
66 | ||
12dc5e62 | 67 | if (!RTA_OK(rta, keylen)) |
e236d4a8 HX |
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 | ||
3c09f17c HX |
83 | authkeylen = keylen - enckeylen; |
84 | ||
cbdcf80d SK |
85 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
86 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & | |
3c09f17c | 87 | CRYPTO_TFM_REQ_MASK); |
cbdcf80d SK |
88 | err = crypto_ahash_setkey(auth, key, authkeylen); |
89 | crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & | |
3c09f17c HX |
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; | |
e236d4a8 HX |
104 | |
105 | badkey: | |
106 | crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
107 | goto out; | |
3c09f17c HX |
108 | } |
109 | ||
cbdcf80d SK |
110 | static void authenc_geniv_ahash_update_done(struct crypto_async_request *areq, |
111 | int err) | |
112 | { | |
113 | struct aead_request *req = areq->data; | |
114 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
115 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
116 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
117 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
118 | ||
119 | if (err) | |
120 | goto out; | |
121 | ||
122 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, | |
123 | areq_ctx->cryptlen); | |
124 | ahash_request_set_callback(ahreq, aead_request_flags(req) & | |
125 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
126 | areq_ctx->complete, req); | |
127 | ||
128 | err = crypto_ahash_finup(ahreq); | |
129 | if (err) | |
130 | goto out; | |
131 | ||
132 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, | |
133 | areq_ctx->cryptlen, | |
134 | crypto_aead_authsize(authenc), 1); | |
135 | ||
136 | out: | |
180ce7e8 | 137 | authenc_request_complete(req, err); |
cbdcf80d SK |
138 | } |
139 | ||
140 | static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err) | |
141 | { | |
142 | struct aead_request *req = areq->data; | |
143 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
144 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
145 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
146 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
147 | ||
148 | if (err) | |
149 | goto out; | |
150 | ||
151 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, | |
152 | areq_ctx->cryptlen, | |
153 | crypto_aead_authsize(authenc), 1); | |
154 | ||
155 | out: | |
156 | aead_request_complete(req, err); | |
157 | } | |
158 | ||
159 | static void authenc_verify_ahash_update_done(struct crypto_async_request *areq, | |
160 | int err) | |
3c09f17c | 161 | { |
cbdcf80d SK |
162 | u8 *ihash; |
163 | unsigned int authsize; | |
164 | struct ablkcipher_request *abreq; | |
165 | struct aead_request *req = areq->data; | |
3c09f17c | 166 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
3c09f17c | 167 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
cbdcf80d SK |
168 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
169 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
921bae54 | 170 | unsigned int cryptlen = req->cryptlen; |
cbdcf80d SK |
171 | |
172 | if (err) | |
173 | goto out; | |
174 | ||
175 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, | |
176 | areq_ctx->cryptlen); | |
177 | ahash_request_set_callback(ahreq, aead_request_flags(req) & | |
178 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
179 | areq_ctx->complete, req); | |
180 | ||
181 | err = crypto_ahash_finup(ahreq); | |
182 | if (err) | |
183 | goto out; | |
184 | ||
185 | authsize = crypto_aead_authsize(authenc); | |
921bae54 | 186 | cryptlen -= authsize; |
cbdcf80d SK |
187 | ihash = ahreq->result + authsize; |
188 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
189 | authsize, 0); | |
190 | ||
5fd53819 | 191 | err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
cbdcf80d SK |
192 | if (err) |
193 | goto out; | |
194 | ||
195 | abreq = aead_request_ctx(req); | |
196 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
197 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
198 | req->base.complete, req->base.data); | |
199 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, | |
921bae54 | 200 | cryptlen, req->iv); |
cbdcf80d SK |
201 | |
202 | err = crypto_ablkcipher_decrypt(abreq); | |
203 | ||
204 | out: | |
180ce7e8 | 205 | authenc_request_complete(req, err); |
cbdcf80d SK |
206 | } |
207 | ||
208 | static void authenc_verify_ahash_done(struct crypto_async_request *areq, | |
209 | int err) | |
210 | { | |
211 | u8 *ihash; | |
212 | unsigned int authsize; | |
213 | struct ablkcipher_request *abreq; | |
214 | struct aead_request *req = areq->data; | |
215 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
216 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
217 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
218 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
921bae54 | 219 | unsigned int cryptlen = req->cryptlen; |
cbdcf80d SK |
220 | |
221 | if (err) | |
222 | goto out; | |
223 | ||
224 | authsize = crypto_aead_authsize(authenc); | |
921bae54 | 225 | cryptlen -= authsize; |
cbdcf80d SK |
226 | ihash = ahreq->result + authsize; |
227 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
228 | authsize, 0); | |
229 | ||
5fd53819 | 230 | err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
cbdcf80d SK |
231 | if (err) |
232 | goto out; | |
233 | ||
234 | abreq = aead_request_ctx(req); | |
235 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
236 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
237 | req->base.complete, req->base.data); | |
238 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, | |
921bae54 | 239 | cryptlen, req->iv); |
cbdcf80d SK |
240 | |
241 | err = crypto_ablkcipher_decrypt(abreq); | |
242 | ||
243 | out: | |
180ce7e8 | 244 | authenc_request_complete(req, err); |
cbdcf80d SK |
245 | } |
246 | ||
247 | static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags) | |
248 | { | |
249 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
250 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
251 | struct crypto_ahash *auth = ctx->auth; | |
252 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
253 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
254 | u8 *hash = areq_ctx->tail; | |
3c09f17c HX |
255 | int err; |
256 | ||
cbdcf80d SK |
257 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
258 | crypto_ahash_alignmask(auth) + 1); | |
259 | ||
260 | ahash_request_set_tfm(ahreq, auth); | |
3c09f17c | 261 | |
cbdcf80d | 262 | err = crypto_ahash_init(ahreq); |
3c09f17c | 263 | if (err) |
cbdcf80d SK |
264 | return ERR_PTR(err); |
265 | ||
266 | ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen); | |
267 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
268 | areq_ctx->update_complete, req); | |
3c09f17c | 269 | |
cbdcf80d | 270 | err = crypto_ahash_update(ahreq); |
3c09f17c | 271 | if (err) |
cbdcf80d SK |
272 | return ERR_PTR(err); |
273 | ||
274 | ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, | |
275 | areq_ctx->cryptlen); | |
276 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
277 | areq_ctx->complete, req); | |
3c09f17c | 278 | |
cbdcf80d | 279 | err = crypto_ahash_finup(ahreq); |
3c09f17c | 280 | if (err) |
cbdcf80d | 281 | return ERR_PTR(err); |
3c09f17c | 282 | |
cbdcf80d SK |
283 | return hash; |
284 | } | |
285 | ||
286 | static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags) | |
287 | { | |
288 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
289 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
290 | struct crypto_ahash *auth = ctx->auth; | |
291 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
292 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
293 | u8 *hash = areq_ctx->tail; | |
294 | int err; | |
3c09f17c | 295 | |
cbdcf80d SK |
296 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
297 | crypto_ahash_alignmask(auth) + 1); | |
298 | ||
299 | ahash_request_set_tfm(ahreq, auth); | |
300 | ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, | |
301 | areq_ctx->cryptlen); | |
302 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
303 | areq_ctx->complete, req); | |
304 | ||
305 | err = crypto_ahash_digest(ahreq); | |
3c09f17c | 306 | if (err) |
7c3d703f HX |
307 | return ERR_PTR(err); |
308 | ||
309 | return hash; | |
310 | } | |
311 | ||
e56dd564 HX |
312 | static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, |
313 | unsigned int flags) | |
7c3d703f HX |
314 | { |
315 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
cbdcf80d | 316 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
7c3d703f | 317 | struct scatterlist *dst = req->dst; |
cbdcf80d SK |
318 | struct scatterlist *assoc = req->assoc; |
319 | struct scatterlist *cipher = areq_ctx->cipher; | |
320 | struct scatterlist *asg = areq_ctx->asg; | |
e56dd564 | 321 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
cbdcf80d SK |
322 | unsigned int cryptlen = req->cryptlen; |
323 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; | |
324 | struct page *dstp; | |
e56dd564 | 325 | u8 *vdst; |
7c3d703f HX |
326 | u8 *hash; |
327 | ||
e56dd564 HX |
328 | dstp = sg_page(dst); |
329 | vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; | |
330 | ||
29b37f42 HX |
331 | if (ivsize) { |
332 | sg_init_table(cipher, 2); | |
333 | sg_set_buf(cipher, iv, ivsize); | |
c920fa60 | 334 | scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); |
29b37f42 | 335 | dst = cipher; |
cbdcf80d | 336 | cryptlen += ivsize; |
29b37f42 | 337 | } |
e56dd564 | 338 | |
9b2f4cb6 | 339 | if (req->assoclen && sg_is_last(assoc)) { |
cbdcf80d SK |
340 | authenc_ahash_fn = crypto_authenc_ahash; |
341 | sg_init_table(asg, 2); | |
342 | sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); | |
c920fa60 | 343 | scatterwalk_crypto_chain(asg, dst, 0, 2); |
cbdcf80d SK |
344 | dst = asg; |
345 | cryptlen += req->assoclen; | |
346 | } | |
347 | ||
348 | areq_ctx->cryptlen = cryptlen; | |
349 | areq_ctx->sg = dst; | |
350 | ||
351 | areq_ctx->complete = authenc_geniv_ahash_done; | |
352 | areq_ctx->update_complete = authenc_geniv_ahash_update_done; | |
353 | ||
354 | hash = authenc_ahash_fn(req, flags); | |
7c3d703f HX |
355 | if (IS_ERR(hash)) |
356 | return PTR_ERR(hash); | |
3c09f17c | 357 | |
29b37f42 | 358 | scatterwalk_map_and_copy(hash, dst, cryptlen, |
7ba683a6 | 359 | crypto_aead_authsize(authenc), 1); |
3c09f17c HX |
360 | return 0; |
361 | } | |
362 | ||
363 | static void crypto_authenc_encrypt_done(struct crypto_async_request *req, | |
364 | int err) | |
365 | { | |
a697690b HX |
366 | struct aead_request *areq = req->data; |
367 | ||
e56dd564 | 368 | if (!err) { |
e56dd564 HX |
369 | struct crypto_aead *authenc = crypto_aead_reqtfm(areq); |
370 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
1c651d36 TL |
371 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(areq); |
372 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail | |
373 | + ctx->reqoff); | |
374 | u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(ctx->enc); | |
e56dd564 HX |
375 | |
376 | err = crypto_authenc_genicv(areq, iv, 0); | |
377 | } | |
3c09f17c | 378 | |
180ce7e8 | 379 | authenc_request_complete(areq, err); |
3c09f17c HX |
380 | } |
381 | ||
382 | static int crypto_authenc_encrypt(struct aead_request *req) | |
383 | { | |
384 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
385 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
50beceba | 386 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
e56dd564 HX |
387 | struct crypto_ablkcipher *enc = ctx->enc; |
388 | struct scatterlist *dst = req->dst; | |
389 | unsigned int cryptlen = req->cryptlen; | |
50beceba SK |
390 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail |
391 | + ctx->reqoff); | |
392 | u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); | |
3c09f17c HX |
393 | int err; |
394 | ||
e56dd564 | 395 | ablkcipher_request_set_tfm(abreq, enc); |
3c09f17c HX |
396 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
397 | crypto_authenc_encrypt_done, req); | |
e56dd564 HX |
398 | ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); |
399 | ||
400 | memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); | |
3c09f17c HX |
401 | |
402 | err = crypto_ablkcipher_encrypt(abreq); | |
403 | if (err) | |
404 | return err; | |
405 | ||
e56dd564 HX |
406 | return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
407 | } | |
408 | ||
409 | static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, | |
410 | int err) | |
411 | { | |
a697690b HX |
412 | struct aead_request *areq = req->data; |
413 | ||
e56dd564 | 414 | if (!err) { |
16161329 | 415 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
e56dd564 | 416 | |
16161329 | 417 | err = crypto_authenc_genicv(areq, greq->giv, 0); |
e56dd564 HX |
418 | } |
419 | ||
180ce7e8 | 420 | authenc_request_complete(areq, err); |
e56dd564 HX |
421 | } |
422 | ||
423 | static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) | |
424 | { | |
425 | struct crypto_aead *authenc = aead_givcrypt_reqtfm(req); | |
426 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
427 | struct aead_request *areq = &req->areq; | |
428 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); | |
429 | u8 *iv = req->giv; | |
430 | int err; | |
431 | ||
432 | skcipher_givcrypt_set_tfm(greq, ctx->enc); | |
433 | skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), | |
434 | crypto_authenc_givencrypt_done, areq); | |
435 | skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, | |
436 | areq->iv); | |
437 | skcipher_givcrypt_set_giv(greq, iv, req->seq); | |
438 | ||
439 | err = crypto_skcipher_givencrypt(greq); | |
440 | if (err) | |
441 | return err; | |
442 | ||
443 | return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); | |
3c09f17c HX |
444 | } |
445 | ||
481f34ae | 446 | static int crypto_authenc_verify(struct aead_request *req, |
cbdcf80d | 447 | authenc_ahash_t authenc_ahash_fn) |
3c09f17c HX |
448 | { |
449 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
cbdcf80d | 450 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
7c3d703f | 451 | u8 *ohash; |
3c09f17c | 452 | u8 *ihash; |
3c09f17c | 453 | unsigned int authsize; |
3c09f17c | 454 | |
cbdcf80d | 455 | areq_ctx->complete = authenc_verify_ahash_done; |
77ba115c | 456 | areq_ctx->update_complete = authenc_verify_ahash_update_done; |
cbdcf80d SK |
457 | |
458 | ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); | |
7c3d703f HX |
459 | if (IS_ERR(ohash)) |
460 | return PTR_ERR(ohash); | |
3c09f17c | 461 | |
7ba683a6 | 462 | authsize = crypto_aead_authsize(authenc); |
7c3d703f | 463 | ihash = ohash + authsize; |
cbdcf80d SK |
464 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
465 | authsize, 0); | |
5fd53819 | 466 | return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0; |
3c09f17c HX |
467 | } |
468 | ||
e56dd564 HX |
469 | static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, |
470 | unsigned int cryptlen) | |
3c09f17c | 471 | { |
e56dd564 | 472 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
cbdcf80d | 473 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
e56dd564 | 474 | struct scatterlist *src = req->src; |
cbdcf80d SK |
475 | struct scatterlist *assoc = req->assoc; |
476 | struct scatterlist *cipher = areq_ctx->cipher; | |
477 | struct scatterlist *asg = areq_ctx->asg; | |
e56dd564 | 478 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
cbdcf80d SK |
479 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
480 | struct page *srcp; | |
e56dd564 HX |
481 | u8 *vsrc; |
482 | ||
483 | srcp = sg_page(src); | |
484 | vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; | |
485 | ||
29b37f42 HX |
486 | if (ivsize) { |
487 | sg_init_table(cipher, 2); | |
488 | sg_set_buf(cipher, iv, ivsize); | |
c920fa60 | 489 | scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); |
29b37f42 | 490 | src = cipher; |
cbdcf80d SK |
491 | cryptlen += ivsize; |
492 | } | |
493 | ||
9b2f4cb6 | 494 | if (req->assoclen && sg_is_last(assoc)) { |
cbdcf80d SK |
495 | authenc_ahash_fn = crypto_authenc_ahash; |
496 | sg_init_table(asg, 2); | |
497 | sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); | |
c920fa60 | 498 | scatterwalk_crypto_chain(asg, src, 0, 2); |
cbdcf80d SK |
499 | src = asg; |
500 | cryptlen += req->assoclen; | |
29b37f42 | 501 | } |
e56dd564 | 502 | |
cbdcf80d SK |
503 | areq_ctx->cryptlen = cryptlen; |
504 | areq_ctx->sg = src; | |
505 | ||
506 | return crypto_authenc_verify(req, authenc_ahash_fn); | |
3c09f17c HX |
507 | } |
508 | ||
509 | static int crypto_authenc_decrypt(struct aead_request *req) | |
510 | { | |
511 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
512 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
513 | struct ablkcipher_request *abreq = aead_request_ctx(req); | |
481f34ae HX |
514 | unsigned int cryptlen = req->cryptlen; |
515 | unsigned int authsize = crypto_aead_authsize(authenc); | |
e56dd564 | 516 | u8 *iv = req->iv; |
3c09f17c HX |
517 | int err; |
518 | ||
481f34ae HX |
519 | if (cryptlen < authsize) |
520 | return -EINVAL; | |
521 | cryptlen -= authsize; | |
522 | ||
e56dd564 | 523 | err = crypto_authenc_iverify(req, iv, cryptlen); |
3c09f17c HX |
524 | if (err) |
525 | return err; | |
526 | ||
527 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
528 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
e56dd564 HX |
529 | req->base.complete, req->base.data); |
530 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); | |
3c09f17c HX |
531 | |
532 | return crypto_ablkcipher_decrypt(abreq); | |
533 | } | |
534 | ||
535 | static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) | |
536 | { | |
cbdcf80d | 537 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
3c09f17c HX |
538 | struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); |
539 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); | |
cbdcf80d | 540 | struct crypto_ahash *auth; |
3c09f17c | 541 | struct crypto_ablkcipher *enc; |
3c09f17c HX |
542 | int err; |
543 | ||
cbdcf80d | 544 | auth = crypto_spawn_ahash(&ictx->auth); |
3c09f17c HX |
545 | if (IS_ERR(auth)) |
546 | return PTR_ERR(auth); | |
547 | ||
9ffde35a | 548 | enc = crypto_spawn_skcipher(&ictx->enc); |
3c09f17c HX |
549 | err = PTR_ERR(enc); |
550 | if (IS_ERR(enc)) | |
cbdcf80d | 551 | goto err_free_ahash; |
3c09f17c HX |
552 | |
553 | ctx->auth = auth; | |
554 | ctx->enc = enc; | |
f3542e6d | 555 | |
50beceba SK |
556 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + |
557 | crypto_ahash_alignmask(auth), | |
558 | crypto_ahash_alignmask(auth) + 1) + | |
559 | crypto_ablkcipher_ivsize(enc); | |
560 | ||
561 | tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) + | |
562 | ctx->reqoff + | |
563 | max_t(unsigned int, | |
564 | crypto_ahash_reqsize(auth) + | |
f3542e6d | 565 | sizeof(struct ahash_request), |
cbdcf80d | 566 | sizeof(struct skcipher_givcrypt_request) + |
50beceba | 567 | crypto_ablkcipher_reqsize(enc)); |
3c09f17c HX |
568 | |
569 | return 0; | |
570 | ||
cbdcf80d SK |
571 | err_free_ahash: |
572 | crypto_free_ahash(auth); | |
3c09f17c HX |
573 | return err; |
574 | } | |
575 | ||
576 | static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) | |
577 | { | |
578 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); | |
579 | ||
cbdcf80d | 580 | crypto_free_ahash(ctx->auth); |
3c09f17c HX |
581 | crypto_free_ablkcipher(ctx->enc); |
582 | } | |
583 | ||
584 | static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) | |
585 | { | |
9ffde35a | 586 | struct crypto_attr_type *algt; |
3c09f17c | 587 | struct crypto_instance *inst; |
cbdcf80d SK |
588 | struct hash_alg_common *auth; |
589 | struct crypto_alg *auth_base; | |
3c09f17c HX |
590 | struct crypto_alg *enc; |
591 | struct authenc_instance_ctx *ctx; | |
9ffde35a | 592 | const char *enc_name; |
3c09f17c HX |
593 | int err; |
594 | ||
9ffde35a | 595 | algt = crypto_get_attr_type(tb); |
9ffde35a | 596 | if (IS_ERR(algt)) |
3e8afe35 | 597 | return ERR_CAST(algt); |
3c09f17c | 598 | |
9ffde35a HX |
599 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
600 | return ERR_PTR(-EINVAL); | |
601 | ||
cbdcf80d SK |
602 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
603 | CRYPTO_ALG_TYPE_AHASH_MASK); | |
3c09f17c | 604 | if (IS_ERR(auth)) |
8db05078 | 605 | return ERR_CAST(auth); |
3c09f17c | 606 | |
cbdcf80d SK |
607 | auth_base = &auth->base; |
608 | ||
9ffde35a HX |
609 | enc_name = crypto_attr_alg_name(tb[2]); |
610 | err = PTR_ERR(enc_name); | |
611 | if (IS_ERR(enc_name)) | |
3c09f17c HX |
612 | goto out_put_auth; |
613 | ||
3c09f17c HX |
614 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
615 | err = -ENOMEM; | |
616 | if (!inst) | |
9ffde35a | 617 | goto out_put_auth; |
3c09f17c HX |
618 | |
619 | ctx = crypto_instance_ctx(inst); | |
3c09f17c | 620 | |
cbdcf80d | 621 | err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); |
3c09f17c HX |
622 | if (err) |
623 | goto err_free_inst; | |
624 | ||
9ffde35a HX |
625 | crypto_set_skcipher_spawn(&ctx->enc, inst); |
626 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, | |
627 | crypto_requires_sync(algt->type, | |
628 | algt->mask)); | |
3c09f17c HX |
629 | if (err) |
630 | goto err_drop_auth; | |
631 | ||
9ffde35a HX |
632 | enc = crypto_skcipher_spawn_alg(&ctx->enc); |
633 | ||
634 | err = -ENAMETOOLONG; | |
635 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
cbdcf80d | 636 | "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
9ffde35a HX |
637 | CRYPTO_MAX_ALG_NAME) |
638 | goto err_drop_enc; | |
639 | ||
640 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
cbdcf80d | 641 | "authenc(%s,%s)", auth_base->cra_driver_name, |
9ffde35a HX |
642 | enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
643 | goto err_drop_enc; | |
644 | ||
645 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; | |
646 | inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; | |
cbdcf80d SK |
647 | inst->alg.cra_priority = enc->cra_priority * |
648 | 10 + auth_base->cra_priority; | |
3c09f17c | 649 | inst->alg.cra_blocksize = enc->cra_blocksize; |
cbdcf80d | 650 | inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; |
3c09f17c HX |
651 | inst->alg.cra_type = &crypto_aead_type; |
652 | ||
c2c61f51 | 653 | inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; |
cbdcf80d | 654 | inst->alg.cra_aead.maxauthsize = auth->digestsize; |
3c09f17c HX |
655 | |
656 | inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx); | |
657 | ||
658 | inst->alg.cra_init = crypto_authenc_init_tfm; | |
659 | inst->alg.cra_exit = crypto_authenc_exit_tfm; | |
660 | ||
661 | inst->alg.cra_aead.setkey = crypto_authenc_setkey; | |
662 | inst->alg.cra_aead.encrypt = crypto_authenc_encrypt; | |
663 | inst->alg.cra_aead.decrypt = crypto_authenc_decrypt; | |
e56dd564 | 664 | inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; |
3c09f17c HX |
665 | |
666 | out: | |
cbdcf80d | 667 | crypto_mod_put(auth_base); |
3c09f17c HX |
668 | return inst; |
669 | ||
9ffde35a HX |
670 | err_drop_enc: |
671 | crypto_drop_skcipher(&ctx->enc); | |
3c09f17c | 672 | err_drop_auth: |
cbdcf80d | 673 | crypto_drop_ahash(&ctx->auth); |
3c09f17c HX |
674 | err_free_inst: |
675 | kfree(inst); | |
9ffde35a | 676 | out_put_auth: |
3c09f17c HX |
677 | inst = ERR_PTR(err); |
678 | goto out; | |
679 | } | |
680 | ||
681 | static void crypto_authenc_free(struct crypto_instance *inst) | |
682 | { | |
683 | struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); | |
684 | ||
9ffde35a | 685 | crypto_drop_skcipher(&ctx->enc); |
cbdcf80d | 686 | crypto_drop_ahash(&ctx->auth); |
3c09f17c HX |
687 | kfree(inst); |
688 | } | |
689 | ||
690 | static struct crypto_template crypto_authenc_tmpl = { | |
691 | .name = "authenc", | |
692 | .alloc = crypto_authenc_alloc, | |
693 | .free = crypto_authenc_free, | |
694 | .module = THIS_MODULE, | |
695 | }; | |
696 | ||
697 | static int __init crypto_authenc_module_init(void) | |
698 | { | |
699 | return crypto_register_template(&crypto_authenc_tmpl); | |
700 | } | |
701 | ||
702 | static void __exit crypto_authenc_module_exit(void) | |
703 | { | |
704 | crypto_unregister_template(&crypto_authenc_tmpl); | |
705 | } | |
706 | ||
707 | module_init(crypto_authenc_module_init); | |
708 | module_exit(crypto_authenc_module_exit); | |
709 | ||
710 | MODULE_LICENSE("GPL"); | |
711 | MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); | |
f2175543 | 712 | MODULE_ALIAS_CRYPTO("authenc"); |