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Commit | Line | Data |
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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 | ||
e56dd564 HX |
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 | ||
cbdcf80d SK |
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: | |
180ce7e8 | 151 | authenc_request_complete(req, err); |
cbdcf80d SK |
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) | |
3c09f17c | 175 | { |
cbdcf80d SK |
176 | u8 *ihash; |
177 | unsigned int authsize; | |
178 | struct ablkcipher_request *abreq; | |
179 | struct aead_request *req = areq->data; | |
3c09f17c | 180 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
3c09f17c | 181 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
cbdcf80d SK |
182 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
183 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
921bae54 | 184 | unsigned int cryptlen = req->cryptlen; |
cbdcf80d SK |
185 | |
186 | if (err) | |
187 | goto out; | |
188 | ||
189 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, | |
190 | areq_ctx->cryptlen); | |
191 | ahash_request_set_callback(ahreq, aead_request_flags(req) & | |
192 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
193 | areq_ctx->complete, req); | |
194 | ||
195 | err = crypto_ahash_finup(ahreq); | |
196 | if (err) | |
197 | goto out; | |
198 | ||
199 | authsize = crypto_aead_authsize(authenc); | |
921bae54 | 200 | cryptlen -= authsize; |
cbdcf80d SK |
201 | ihash = ahreq->result + authsize; |
202 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
203 | authsize, 0); | |
204 | ||
f3542e6d | 205 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
cbdcf80d SK |
206 | if (err) |
207 | goto out; | |
208 | ||
209 | abreq = aead_request_ctx(req); | |
210 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
211 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
212 | req->base.complete, req->base.data); | |
213 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, | |
921bae54 | 214 | cryptlen, req->iv); |
cbdcf80d SK |
215 | |
216 | err = crypto_ablkcipher_decrypt(abreq); | |
217 | ||
218 | out: | |
180ce7e8 | 219 | authenc_request_complete(req, err); |
cbdcf80d SK |
220 | } |
221 | ||
222 | static void authenc_verify_ahash_done(struct crypto_async_request *areq, | |
223 | int err) | |
224 | { | |
225 | u8 *ihash; | |
226 | unsigned int authsize; | |
227 | struct ablkcipher_request *abreq; | |
228 | struct aead_request *req = areq->data; | |
229 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
230 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
231 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
232 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
921bae54 | 233 | unsigned int cryptlen = req->cryptlen; |
cbdcf80d SK |
234 | |
235 | if (err) | |
236 | goto out; | |
237 | ||
238 | authsize = crypto_aead_authsize(authenc); | |
921bae54 | 239 | cryptlen -= authsize; |
cbdcf80d SK |
240 | ihash = ahreq->result + authsize; |
241 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
242 | authsize, 0); | |
243 | ||
f3542e6d | 244 | err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
cbdcf80d SK |
245 | if (err) |
246 | goto out; | |
247 | ||
248 | abreq = aead_request_ctx(req); | |
249 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
250 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
251 | req->base.complete, req->base.data); | |
252 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, | |
921bae54 | 253 | cryptlen, req->iv); |
cbdcf80d SK |
254 | |
255 | err = crypto_ablkcipher_decrypt(abreq); | |
256 | ||
257 | out: | |
180ce7e8 | 258 | authenc_request_complete(req, err); |
cbdcf80d SK |
259 | } |
260 | ||
261 | static u8 *crypto_authenc_ahash_fb(struct aead_request *req, unsigned int flags) | |
262 | { | |
263 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
264 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
265 | struct crypto_ahash *auth = ctx->auth; | |
266 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
267 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
268 | u8 *hash = areq_ctx->tail; | |
3c09f17c HX |
269 | int err; |
270 | ||
cbdcf80d SK |
271 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
272 | crypto_ahash_alignmask(auth) + 1); | |
273 | ||
274 | ahash_request_set_tfm(ahreq, auth); | |
3c09f17c | 275 | |
cbdcf80d | 276 | err = crypto_ahash_init(ahreq); |
3c09f17c | 277 | if (err) |
cbdcf80d SK |
278 | return ERR_PTR(err); |
279 | ||
280 | ahash_request_set_crypt(ahreq, req->assoc, hash, req->assoclen); | |
281 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
282 | areq_ctx->update_complete, req); | |
3c09f17c | 283 | |
cbdcf80d | 284 | err = crypto_ahash_update(ahreq); |
3c09f17c | 285 | if (err) |
cbdcf80d SK |
286 | return ERR_PTR(err); |
287 | ||
288 | ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, | |
289 | areq_ctx->cryptlen); | |
290 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
291 | areq_ctx->complete, req); | |
3c09f17c | 292 | |
cbdcf80d | 293 | err = crypto_ahash_finup(ahreq); |
3c09f17c | 294 | if (err) |
cbdcf80d | 295 | return ERR_PTR(err); |
3c09f17c | 296 | |
cbdcf80d SK |
297 | return hash; |
298 | } | |
299 | ||
300 | static u8 *crypto_authenc_ahash(struct aead_request *req, unsigned int flags) | |
301 | { | |
302 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
303 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
304 | struct crypto_ahash *auth = ctx->auth; | |
305 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
306 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
307 | u8 *hash = areq_ctx->tail; | |
308 | int err; | |
3c09f17c | 309 | |
cbdcf80d SK |
310 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
311 | crypto_ahash_alignmask(auth) + 1); | |
312 | ||
313 | ahash_request_set_tfm(ahreq, auth); | |
314 | ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, | |
315 | areq_ctx->cryptlen); | |
316 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
317 | areq_ctx->complete, req); | |
318 | ||
319 | err = crypto_ahash_digest(ahreq); | |
3c09f17c | 320 | if (err) |
7c3d703f HX |
321 | return ERR_PTR(err); |
322 | ||
323 | return hash; | |
324 | } | |
325 | ||
e56dd564 HX |
326 | static int crypto_authenc_genicv(struct aead_request *req, u8 *iv, |
327 | unsigned int flags) | |
7c3d703f HX |
328 | { |
329 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
cbdcf80d | 330 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
7c3d703f | 331 | struct scatterlist *dst = req->dst; |
cbdcf80d SK |
332 | struct scatterlist *assoc = req->assoc; |
333 | struct scatterlist *cipher = areq_ctx->cipher; | |
334 | struct scatterlist *asg = areq_ctx->asg; | |
e56dd564 | 335 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
cbdcf80d SK |
336 | unsigned int cryptlen = req->cryptlen; |
337 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; | |
338 | struct page *dstp; | |
e56dd564 | 339 | u8 *vdst; |
7c3d703f HX |
340 | u8 *hash; |
341 | ||
e56dd564 HX |
342 | dstp = sg_page(dst); |
343 | vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; | |
344 | ||
29b37f42 HX |
345 | if (ivsize) { |
346 | sg_init_table(cipher, 2); | |
347 | sg_set_buf(cipher, iv, ivsize); | |
348 | authenc_chain(cipher, dst, vdst == iv + ivsize); | |
349 | dst = cipher; | |
cbdcf80d | 350 | cryptlen += ivsize; |
29b37f42 | 351 | } |
e56dd564 | 352 | |
cbdcf80d SK |
353 | if (sg_is_last(assoc)) { |
354 | authenc_ahash_fn = crypto_authenc_ahash; | |
355 | sg_init_table(asg, 2); | |
356 | sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); | |
357 | authenc_chain(asg, dst, 0); | |
358 | dst = asg; | |
359 | cryptlen += req->assoclen; | |
360 | } | |
361 | ||
362 | areq_ctx->cryptlen = cryptlen; | |
363 | areq_ctx->sg = dst; | |
364 | ||
365 | areq_ctx->complete = authenc_geniv_ahash_done; | |
366 | areq_ctx->update_complete = authenc_geniv_ahash_update_done; | |
367 | ||
368 | hash = authenc_ahash_fn(req, flags); | |
7c3d703f HX |
369 | if (IS_ERR(hash)) |
370 | return PTR_ERR(hash); | |
3c09f17c | 371 | |
29b37f42 | 372 | scatterwalk_map_and_copy(hash, dst, cryptlen, |
7ba683a6 | 373 | crypto_aead_authsize(authenc), 1); |
3c09f17c HX |
374 | return 0; |
375 | } | |
376 | ||
377 | static void crypto_authenc_encrypt_done(struct crypto_async_request *req, | |
378 | int err) | |
379 | { | |
a697690b HX |
380 | struct aead_request *areq = req->data; |
381 | ||
e56dd564 | 382 | if (!err) { |
e56dd564 HX |
383 | struct crypto_aead *authenc = crypto_aead_reqtfm(areq); |
384 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
385 | struct ablkcipher_request *abreq = aead_request_ctx(areq); | |
386 | u8 *iv = (u8 *)(abreq + 1) + | |
387 | crypto_ablkcipher_reqsize(ctx->enc); | |
388 | ||
389 | err = crypto_authenc_genicv(areq, iv, 0); | |
390 | } | |
3c09f17c | 391 | |
180ce7e8 | 392 | authenc_request_complete(areq, err); |
3c09f17c HX |
393 | } |
394 | ||
395 | static int crypto_authenc_encrypt(struct aead_request *req) | |
396 | { | |
397 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
398 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
50beceba | 399 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
e56dd564 HX |
400 | struct crypto_ablkcipher *enc = ctx->enc; |
401 | struct scatterlist *dst = req->dst; | |
402 | unsigned int cryptlen = req->cryptlen; | |
50beceba SK |
403 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail |
404 | + ctx->reqoff); | |
405 | u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); | |
3c09f17c HX |
406 | int err; |
407 | ||
e56dd564 | 408 | ablkcipher_request_set_tfm(abreq, enc); |
3c09f17c HX |
409 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), |
410 | crypto_authenc_encrypt_done, req); | |
e56dd564 HX |
411 | ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); |
412 | ||
413 | memcpy(iv, req->iv, crypto_aead_ivsize(authenc)); | |
3c09f17c HX |
414 | |
415 | err = crypto_ablkcipher_encrypt(abreq); | |
416 | if (err) | |
417 | return err; | |
418 | ||
e56dd564 HX |
419 | return crypto_authenc_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); |
420 | } | |
421 | ||
422 | static void crypto_authenc_givencrypt_done(struct crypto_async_request *req, | |
423 | int err) | |
424 | { | |
a697690b HX |
425 | struct aead_request *areq = req->data; |
426 | ||
e56dd564 | 427 | if (!err) { |
16161329 | 428 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); |
e56dd564 | 429 | |
16161329 | 430 | err = crypto_authenc_genicv(areq, greq->giv, 0); |
e56dd564 HX |
431 | } |
432 | ||
180ce7e8 | 433 | authenc_request_complete(areq, err); |
e56dd564 HX |
434 | } |
435 | ||
436 | static int crypto_authenc_givencrypt(struct aead_givcrypt_request *req) | |
437 | { | |
438 | struct crypto_aead *authenc = aead_givcrypt_reqtfm(req); | |
439 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
440 | struct aead_request *areq = &req->areq; | |
441 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); | |
442 | u8 *iv = req->giv; | |
443 | int err; | |
444 | ||
445 | skcipher_givcrypt_set_tfm(greq, ctx->enc); | |
446 | skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), | |
447 | crypto_authenc_givencrypt_done, areq); | |
448 | skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, | |
449 | areq->iv); | |
450 | skcipher_givcrypt_set_giv(greq, iv, req->seq); | |
451 | ||
452 | err = crypto_skcipher_givencrypt(greq); | |
453 | if (err) | |
454 | return err; | |
455 | ||
456 | return crypto_authenc_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); | |
3c09f17c HX |
457 | } |
458 | ||
481f34ae | 459 | static int crypto_authenc_verify(struct aead_request *req, |
cbdcf80d | 460 | authenc_ahash_t authenc_ahash_fn) |
3c09f17c HX |
461 | { |
462 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
cbdcf80d | 463 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
7c3d703f | 464 | u8 *ohash; |
3c09f17c | 465 | u8 *ihash; |
3c09f17c | 466 | unsigned int authsize; |
3c09f17c | 467 | |
cbdcf80d | 468 | areq_ctx->complete = authenc_verify_ahash_done; |
77ba115c | 469 | areq_ctx->update_complete = authenc_verify_ahash_update_done; |
cbdcf80d SK |
470 | |
471 | ohash = authenc_ahash_fn(req, CRYPTO_TFM_REQ_MAY_SLEEP); | |
7c3d703f HX |
472 | if (IS_ERR(ohash)) |
473 | return PTR_ERR(ohash); | |
3c09f17c | 474 | |
7ba683a6 | 475 | authsize = crypto_aead_authsize(authenc); |
7c3d703f | 476 | ihash = ohash + authsize; |
cbdcf80d SK |
477 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, |
478 | authsize, 0); | |
f3542e6d | 479 | return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0; |
3c09f17c HX |
480 | } |
481 | ||
e56dd564 HX |
482 | static int crypto_authenc_iverify(struct aead_request *req, u8 *iv, |
483 | unsigned int cryptlen) | |
3c09f17c | 484 | { |
e56dd564 | 485 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
cbdcf80d | 486 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
e56dd564 | 487 | struct scatterlist *src = req->src; |
cbdcf80d SK |
488 | struct scatterlist *assoc = req->assoc; |
489 | struct scatterlist *cipher = areq_ctx->cipher; | |
490 | struct scatterlist *asg = areq_ctx->asg; | |
e56dd564 | 491 | unsigned int ivsize = crypto_aead_ivsize(authenc); |
cbdcf80d SK |
492 | authenc_ahash_t authenc_ahash_fn = crypto_authenc_ahash_fb; |
493 | struct page *srcp; | |
e56dd564 HX |
494 | u8 *vsrc; |
495 | ||
496 | srcp = sg_page(src); | |
497 | vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; | |
498 | ||
29b37f42 HX |
499 | if (ivsize) { |
500 | sg_init_table(cipher, 2); | |
501 | sg_set_buf(cipher, iv, ivsize); | |
502 | authenc_chain(cipher, src, vsrc == iv + ivsize); | |
503 | src = cipher; | |
cbdcf80d SK |
504 | cryptlen += ivsize; |
505 | } | |
506 | ||
507 | if (sg_is_last(assoc)) { | |
508 | authenc_ahash_fn = crypto_authenc_ahash; | |
509 | sg_init_table(asg, 2); | |
510 | sg_set_page(asg, sg_page(assoc), assoc->length, assoc->offset); | |
511 | authenc_chain(asg, src, 0); | |
512 | src = asg; | |
513 | cryptlen += req->assoclen; | |
29b37f42 | 514 | } |
e56dd564 | 515 | |
cbdcf80d SK |
516 | areq_ctx->cryptlen = cryptlen; |
517 | areq_ctx->sg = src; | |
518 | ||
519 | return crypto_authenc_verify(req, authenc_ahash_fn); | |
3c09f17c HX |
520 | } |
521 | ||
522 | static int crypto_authenc_decrypt(struct aead_request *req) | |
523 | { | |
524 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
525 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
526 | struct ablkcipher_request *abreq = aead_request_ctx(req); | |
481f34ae HX |
527 | unsigned int cryptlen = req->cryptlen; |
528 | unsigned int authsize = crypto_aead_authsize(authenc); | |
e56dd564 | 529 | u8 *iv = req->iv; |
3c09f17c HX |
530 | int err; |
531 | ||
481f34ae HX |
532 | if (cryptlen < authsize) |
533 | return -EINVAL; | |
534 | cryptlen -= authsize; | |
535 | ||
e56dd564 | 536 | err = crypto_authenc_iverify(req, iv, cryptlen); |
3c09f17c HX |
537 | if (err) |
538 | return err; | |
539 | ||
540 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
541 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
e56dd564 HX |
542 | req->base.complete, req->base.data); |
543 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); | |
3c09f17c HX |
544 | |
545 | return crypto_ablkcipher_decrypt(abreq); | |
546 | } | |
547 | ||
548 | static int crypto_authenc_init_tfm(struct crypto_tfm *tfm) | |
549 | { | |
cbdcf80d | 550 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); |
3c09f17c HX |
551 | struct authenc_instance_ctx *ictx = crypto_instance_ctx(inst); |
552 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); | |
cbdcf80d | 553 | struct crypto_ahash *auth; |
3c09f17c | 554 | struct crypto_ablkcipher *enc; |
3c09f17c HX |
555 | int err; |
556 | ||
cbdcf80d | 557 | auth = crypto_spawn_ahash(&ictx->auth); |
3c09f17c HX |
558 | if (IS_ERR(auth)) |
559 | return PTR_ERR(auth); | |
560 | ||
9ffde35a | 561 | enc = crypto_spawn_skcipher(&ictx->enc); |
3c09f17c HX |
562 | err = PTR_ERR(enc); |
563 | if (IS_ERR(enc)) | |
cbdcf80d | 564 | goto err_free_ahash; |
3c09f17c HX |
565 | |
566 | ctx->auth = auth; | |
567 | ctx->enc = enc; | |
f3542e6d | 568 | |
50beceba SK |
569 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + |
570 | crypto_ahash_alignmask(auth), | |
571 | crypto_ahash_alignmask(auth) + 1) + | |
572 | crypto_ablkcipher_ivsize(enc); | |
573 | ||
574 | tfm->crt_aead.reqsize = sizeof(struct authenc_request_ctx) + | |
575 | ctx->reqoff + | |
576 | max_t(unsigned int, | |
577 | crypto_ahash_reqsize(auth) + | |
f3542e6d | 578 | sizeof(struct ahash_request), |
cbdcf80d | 579 | sizeof(struct skcipher_givcrypt_request) + |
50beceba | 580 | crypto_ablkcipher_reqsize(enc)); |
3c09f17c HX |
581 | |
582 | return 0; | |
583 | ||
cbdcf80d SK |
584 | err_free_ahash: |
585 | crypto_free_ahash(auth); | |
3c09f17c HX |
586 | return err; |
587 | } | |
588 | ||
589 | static void crypto_authenc_exit_tfm(struct crypto_tfm *tfm) | |
590 | { | |
591 | struct crypto_authenc_ctx *ctx = crypto_tfm_ctx(tfm); | |
592 | ||
cbdcf80d | 593 | crypto_free_ahash(ctx->auth); |
3c09f17c HX |
594 | crypto_free_ablkcipher(ctx->enc); |
595 | } | |
596 | ||
597 | static struct crypto_instance *crypto_authenc_alloc(struct rtattr **tb) | |
598 | { | |
9ffde35a | 599 | struct crypto_attr_type *algt; |
3c09f17c | 600 | struct crypto_instance *inst; |
cbdcf80d SK |
601 | struct hash_alg_common *auth; |
602 | struct crypto_alg *auth_base; | |
3c09f17c HX |
603 | struct crypto_alg *enc; |
604 | struct authenc_instance_ctx *ctx; | |
9ffde35a | 605 | const char *enc_name; |
3c09f17c HX |
606 | int err; |
607 | ||
9ffde35a HX |
608 | algt = crypto_get_attr_type(tb); |
609 | err = PTR_ERR(algt); | |
610 | if (IS_ERR(algt)) | |
3c09f17c HX |
611 | return ERR_PTR(err); |
612 | ||
9ffde35a HX |
613 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
614 | return ERR_PTR(-EINVAL); | |
615 | ||
cbdcf80d SK |
616 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
617 | CRYPTO_ALG_TYPE_AHASH_MASK); | |
3c09f17c | 618 | if (IS_ERR(auth)) |
8db05078 | 619 | return ERR_CAST(auth); |
3c09f17c | 620 | |
cbdcf80d SK |
621 | auth_base = &auth->base; |
622 | ||
9ffde35a HX |
623 | enc_name = crypto_attr_alg_name(tb[2]); |
624 | err = PTR_ERR(enc_name); | |
625 | if (IS_ERR(enc_name)) | |
3c09f17c HX |
626 | goto out_put_auth; |
627 | ||
3c09f17c HX |
628 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
629 | err = -ENOMEM; | |
630 | if (!inst) | |
9ffde35a | 631 | goto out_put_auth; |
3c09f17c HX |
632 | |
633 | ctx = crypto_instance_ctx(inst); | |
3c09f17c | 634 | |
cbdcf80d | 635 | err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); |
3c09f17c HX |
636 | if (err) |
637 | goto err_free_inst; | |
638 | ||
9ffde35a HX |
639 | crypto_set_skcipher_spawn(&ctx->enc, inst); |
640 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, | |
641 | crypto_requires_sync(algt->type, | |
642 | algt->mask)); | |
3c09f17c HX |
643 | if (err) |
644 | goto err_drop_auth; | |
645 | ||
9ffde35a HX |
646 | enc = crypto_skcipher_spawn_alg(&ctx->enc); |
647 | ||
648 | err = -ENAMETOOLONG; | |
649 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
cbdcf80d | 650 | "authenc(%s,%s)", auth_base->cra_name, enc->cra_name) >= |
9ffde35a HX |
651 | CRYPTO_MAX_ALG_NAME) |
652 | goto err_drop_enc; | |
653 | ||
654 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
cbdcf80d | 655 | "authenc(%s,%s)", auth_base->cra_driver_name, |
9ffde35a HX |
656 | enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
657 | goto err_drop_enc; | |
658 | ||
659 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; | |
660 | inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; | |
cbdcf80d SK |
661 | inst->alg.cra_priority = enc->cra_priority * |
662 | 10 + auth_base->cra_priority; | |
3c09f17c | 663 | inst->alg.cra_blocksize = enc->cra_blocksize; |
cbdcf80d | 664 | inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; |
3c09f17c HX |
665 | inst->alg.cra_type = &crypto_aead_type; |
666 | ||
c2c61f51 | 667 | inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; |
cbdcf80d | 668 | inst->alg.cra_aead.maxauthsize = auth->digestsize; |
3c09f17c HX |
669 | |
670 | inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_ctx); | |
671 | ||
672 | inst->alg.cra_init = crypto_authenc_init_tfm; | |
673 | inst->alg.cra_exit = crypto_authenc_exit_tfm; | |
674 | ||
675 | inst->alg.cra_aead.setkey = crypto_authenc_setkey; | |
676 | inst->alg.cra_aead.encrypt = crypto_authenc_encrypt; | |
677 | inst->alg.cra_aead.decrypt = crypto_authenc_decrypt; | |
e56dd564 | 678 | inst->alg.cra_aead.givencrypt = crypto_authenc_givencrypt; |
3c09f17c HX |
679 | |
680 | out: | |
cbdcf80d | 681 | crypto_mod_put(auth_base); |
3c09f17c HX |
682 | return inst; |
683 | ||
9ffde35a HX |
684 | err_drop_enc: |
685 | crypto_drop_skcipher(&ctx->enc); | |
3c09f17c | 686 | err_drop_auth: |
cbdcf80d | 687 | crypto_drop_ahash(&ctx->auth); |
3c09f17c HX |
688 | err_free_inst: |
689 | kfree(inst); | |
9ffde35a | 690 | out_put_auth: |
3c09f17c HX |
691 | inst = ERR_PTR(err); |
692 | goto out; | |
693 | } | |
694 | ||
695 | static void crypto_authenc_free(struct crypto_instance *inst) | |
696 | { | |
697 | struct authenc_instance_ctx *ctx = crypto_instance_ctx(inst); | |
698 | ||
9ffde35a | 699 | crypto_drop_skcipher(&ctx->enc); |
cbdcf80d | 700 | crypto_drop_ahash(&ctx->auth); |
3c09f17c HX |
701 | kfree(inst); |
702 | } | |
703 | ||
704 | static struct crypto_template crypto_authenc_tmpl = { | |
705 | .name = "authenc", | |
706 | .alloc = crypto_authenc_alloc, | |
707 | .free = crypto_authenc_free, | |
708 | .module = THIS_MODULE, | |
709 | }; | |
710 | ||
711 | static int __init crypto_authenc_module_init(void) | |
712 | { | |
713 | return crypto_register_template(&crypto_authenc_tmpl); | |
714 | } | |
715 | ||
716 | static void __exit crypto_authenc_module_exit(void) | |
717 | { | |
718 | crypto_unregister_template(&crypto_authenc_tmpl); | |
719 | } | |
720 | ||
721 | module_init(crypto_authenc_module_init); | |
722 | module_exit(crypto_authenc_module_exit); | |
723 | ||
724 | MODULE_LICENSE("GPL"); | |
725 | MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); |