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a5079d08 SK |
1 | /* |
2 | * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers, | |
3 | * derived from authenc.c | |
4 | * | |
5 | * Copyright (C) 2010 secunet Security Networks AG | |
6 | * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | */ | |
14 | ||
7fb2a4bd | 15 | #include <crypto/internal/aead.h> |
a5079d08 SK |
16 | #include <crypto/internal/hash.h> |
17 | #include <crypto/internal/skcipher.h> | |
18 | #include <crypto/authenc.h> | |
19 | #include <crypto/scatterwalk.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/spinlock.h> | |
27 | ||
28 | struct authenc_esn_instance_ctx { | |
29 | struct crypto_ahash_spawn auth; | |
30 | struct crypto_skcipher_spawn enc; | |
31 | }; | |
32 | ||
33 | struct crypto_authenc_esn_ctx { | |
34 | unsigned int reqoff; | |
35 | struct crypto_ahash *auth; | |
36 | struct crypto_ablkcipher *enc; | |
37 | }; | |
38 | ||
39 | struct authenc_esn_request_ctx { | |
40 | unsigned int cryptlen; | |
41 | unsigned int headlen; | |
42 | unsigned int trailen; | |
43 | struct scatterlist *sg; | |
44 | struct scatterlist hsg[2]; | |
45 | struct scatterlist tsg[1]; | |
46 | struct scatterlist cipher[2]; | |
47 | crypto_completion_t complete; | |
48 | crypto_completion_t update_complete; | |
49 | crypto_completion_t update_complete2; | |
50 | char tail[]; | |
51 | }; | |
52 | ||
53 | static void authenc_esn_request_complete(struct aead_request *req, int err) | |
54 | { | |
55 | if (err != -EINPROGRESS) | |
56 | aead_request_complete(req, err); | |
57 | } | |
58 | ||
59 | static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key, | |
60 | unsigned int keylen) | |
61 | { | |
a5079d08 SK |
62 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
63 | struct crypto_ahash *auth = ctx->auth; | |
64 | struct crypto_ablkcipher *enc = ctx->enc; | |
fddc2c43 | 65 | struct crypto_authenc_keys keys; |
a5079d08 SK |
66 | int err = -EINVAL; |
67 | ||
fddc2c43 | 68 | if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) |
a5079d08 | 69 | goto badkey; |
a5079d08 SK |
70 | |
71 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); | |
72 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) & | |
73 | CRYPTO_TFM_REQ_MASK); | |
fddc2c43 | 74 | err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
a5079d08 SK |
75 | crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) & |
76 | CRYPTO_TFM_RES_MASK); | |
77 | ||
78 | if (err) | |
79 | goto out; | |
80 | ||
81 | crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); | |
82 | crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) & | |
83 | CRYPTO_TFM_REQ_MASK); | |
fddc2c43 | 84 | err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen); |
a5079d08 SK |
85 | crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) & |
86 | CRYPTO_TFM_RES_MASK); | |
87 | ||
88 | out: | |
89 | return err; | |
90 | ||
91 | badkey: | |
92 | crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
93 | goto out; | |
94 | } | |
95 | ||
96 | static void authenc_esn_geniv_ahash_update_done(struct crypto_async_request *areq, | |
97 | int err) | |
98 | { | |
99 | struct aead_request *req = areq->data; | |
100 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
101 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
102 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
103 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
104 | ||
105 | if (err) | |
106 | goto out; | |
107 | ||
108 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, | |
109 | areq_ctx->cryptlen); | |
110 | ahash_request_set_callback(ahreq, aead_request_flags(req) & | |
111 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
112 | areq_ctx->update_complete2, req); | |
113 | ||
114 | err = crypto_ahash_update(ahreq); | |
115 | if (err) | |
116 | goto out; | |
117 | ||
118 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, | |
119 | areq_ctx->trailen); | |
120 | ahash_request_set_callback(ahreq, aead_request_flags(req) & | |
121 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
122 | areq_ctx->complete, req); | |
123 | ||
124 | err = crypto_ahash_finup(ahreq); | |
125 | if (err) | |
126 | goto out; | |
127 | ||
128 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, | |
129 | areq_ctx->cryptlen, | |
130 | crypto_aead_authsize(authenc_esn), 1); | |
131 | ||
132 | out: | |
133 | authenc_esn_request_complete(req, err); | |
134 | } | |
135 | ||
136 | static void authenc_esn_geniv_ahash_update_done2(struct crypto_async_request *areq, | |
137 | int err) | |
138 | { | |
139 | struct aead_request *req = areq->data; | |
140 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
141 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
142 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
143 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
144 | ||
145 | if (err) | |
146 | goto out; | |
147 | ||
148 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, | |
149 | areq_ctx->trailen); | |
150 | ahash_request_set_callback(ahreq, aead_request_flags(req) & | |
151 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
152 | areq_ctx->complete, req); | |
153 | ||
154 | err = crypto_ahash_finup(ahreq); | |
155 | if (err) | |
156 | goto out; | |
157 | ||
158 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, | |
159 | areq_ctx->cryptlen, | |
160 | crypto_aead_authsize(authenc_esn), 1); | |
161 | ||
162 | out: | |
163 | authenc_esn_request_complete(req, err); | |
164 | } | |
165 | ||
166 | ||
167 | static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq, | |
168 | int err) | |
169 | { | |
170 | struct aead_request *req = areq->data; | |
171 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
172 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
173 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
174 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
175 | ||
176 | if (err) | |
177 | goto out; | |
178 | ||
179 | scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg, | |
180 | areq_ctx->cryptlen, | |
181 | crypto_aead_authsize(authenc_esn), 1); | |
182 | ||
183 | out: | |
184 | aead_request_complete(req, err); | |
185 | } | |
186 | ||
187 | ||
188 | static void authenc_esn_verify_ahash_update_done(struct crypto_async_request *areq, | |
189 | int err) | |
190 | { | |
191 | u8 *ihash; | |
192 | unsigned int authsize; | |
193 | struct ablkcipher_request *abreq; | |
194 | struct aead_request *req = areq->data; | |
195 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
196 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
197 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
198 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
199 | unsigned int cryptlen = req->cryptlen; | |
200 | ||
201 | if (err) | |
202 | goto out; | |
203 | ||
204 | ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result, | |
205 | areq_ctx->cryptlen); | |
206 | ||
207 | ahash_request_set_callback(ahreq, | |
208 | aead_request_flags(req) & | |
209 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
210 | areq_ctx->update_complete2, req); | |
211 | ||
212 | err = crypto_ahash_update(ahreq); | |
213 | if (err) | |
214 | goto out; | |
215 | ||
216 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, | |
217 | areq_ctx->trailen); | |
218 | ahash_request_set_callback(ahreq, aead_request_flags(req) & | |
219 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
220 | areq_ctx->complete, req); | |
221 | ||
222 | err = crypto_ahash_finup(ahreq); | |
223 | if (err) | |
224 | goto out; | |
225 | ||
226 | authsize = crypto_aead_authsize(authenc_esn); | |
227 | cryptlen -= authsize; | |
228 | ihash = ahreq->result + authsize; | |
229 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
230 | authsize, 0); | |
231 | ||
6bf37e5a | 232 | err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
a5079d08 SK |
233 | if (err) |
234 | goto out; | |
235 | ||
236 | abreq = aead_request_ctx(req); | |
237 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
238 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
239 | req->base.complete, req->base.data); | |
240 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, | |
241 | cryptlen, req->iv); | |
242 | ||
243 | err = crypto_ablkcipher_decrypt(abreq); | |
244 | ||
245 | out: | |
246 | authenc_esn_request_complete(req, err); | |
247 | } | |
248 | ||
249 | static void authenc_esn_verify_ahash_update_done2(struct crypto_async_request *areq, | |
250 | int err) | |
251 | { | |
252 | u8 *ihash; | |
253 | unsigned int authsize; | |
254 | struct ablkcipher_request *abreq; | |
255 | struct aead_request *req = areq->data; | |
256 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
257 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
258 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
259 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
260 | unsigned int cryptlen = req->cryptlen; | |
261 | ||
262 | if (err) | |
263 | goto out; | |
264 | ||
265 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result, | |
266 | areq_ctx->trailen); | |
267 | ahash_request_set_callback(ahreq, aead_request_flags(req) & | |
268 | CRYPTO_TFM_REQ_MAY_SLEEP, | |
269 | areq_ctx->complete, req); | |
270 | ||
271 | err = crypto_ahash_finup(ahreq); | |
272 | if (err) | |
273 | goto out; | |
274 | ||
275 | authsize = crypto_aead_authsize(authenc_esn); | |
276 | cryptlen -= authsize; | |
277 | ihash = ahreq->result + authsize; | |
278 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
279 | authsize, 0); | |
280 | ||
6bf37e5a | 281 | err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
a5079d08 SK |
282 | if (err) |
283 | goto out; | |
284 | ||
285 | abreq = aead_request_ctx(req); | |
286 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
287 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
288 | req->base.complete, req->base.data); | |
289 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, | |
290 | cryptlen, req->iv); | |
291 | ||
292 | err = crypto_ablkcipher_decrypt(abreq); | |
293 | ||
294 | out: | |
295 | authenc_esn_request_complete(req, err); | |
296 | } | |
297 | ||
298 | ||
299 | static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq, | |
300 | int err) | |
301 | { | |
302 | u8 *ihash; | |
303 | unsigned int authsize; | |
304 | struct ablkcipher_request *abreq; | |
305 | struct aead_request *req = areq->data; | |
306 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
307 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
308 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
309 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
310 | unsigned int cryptlen = req->cryptlen; | |
311 | ||
312 | if (err) | |
313 | goto out; | |
314 | ||
315 | authsize = crypto_aead_authsize(authenc_esn); | |
316 | cryptlen -= authsize; | |
317 | ihash = ahreq->result + authsize; | |
318 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
319 | authsize, 0); | |
320 | ||
6bf37e5a | 321 | err = crypto_memneq(ihash, ahreq->result, authsize) ? -EBADMSG : 0; |
a5079d08 SK |
322 | if (err) |
323 | goto out; | |
324 | ||
325 | abreq = aead_request_ctx(req); | |
326 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
327 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
328 | req->base.complete, req->base.data); | |
329 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, | |
330 | cryptlen, req->iv); | |
331 | ||
332 | err = crypto_ablkcipher_decrypt(abreq); | |
333 | ||
334 | out: | |
335 | authenc_esn_request_complete(req, err); | |
336 | } | |
337 | ||
338 | static u8 *crypto_authenc_esn_ahash(struct aead_request *req, | |
339 | unsigned int flags) | |
340 | { | |
341 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
342 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
343 | struct crypto_ahash *auth = ctx->auth; | |
344 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
345 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
346 | u8 *hash = areq_ctx->tail; | |
347 | int err; | |
348 | ||
349 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), | |
350 | crypto_ahash_alignmask(auth) + 1); | |
351 | ||
352 | ahash_request_set_tfm(ahreq, auth); | |
353 | ||
354 | err = crypto_ahash_init(ahreq); | |
355 | if (err) | |
356 | return ERR_PTR(err); | |
357 | ||
358 | ahash_request_set_crypt(ahreq, areq_ctx->hsg, hash, areq_ctx->headlen); | |
359 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
360 | areq_ctx->update_complete, req); | |
361 | ||
362 | err = crypto_ahash_update(ahreq); | |
363 | if (err) | |
364 | return ERR_PTR(err); | |
365 | ||
366 | ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, areq_ctx->cryptlen); | |
367 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
368 | areq_ctx->update_complete2, req); | |
369 | ||
370 | err = crypto_ahash_update(ahreq); | |
371 | if (err) | |
372 | return ERR_PTR(err); | |
373 | ||
374 | ahash_request_set_crypt(ahreq, areq_ctx->tsg, hash, | |
375 | areq_ctx->trailen); | |
376 | ahash_request_set_callback(ahreq, aead_request_flags(req) & flags, | |
377 | areq_ctx->complete, req); | |
378 | ||
379 | err = crypto_ahash_finup(ahreq); | |
380 | if (err) | |
381 | return ERR_PTR(err); | |
382 | ||
383 | return hash; | |
384 | } | |
385 | ||
386 | static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv, | |
387 | unsigned int flags) | |
388 | { | |
389 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
390 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
391 | struct scatterlist *dst = req->dst; | |
392 | struct scatterlist *assoc = req->assoc; | |
393 | struct scatterlist *cipher = areq_ctx->cipher; | |
394 | struct scatterlist *hsg = areq_ctx->hsg; | |
395 | struct scatterlist *tsg = areq_ctx->tsg; | |
a5079d08 SK |
396 | unsigned int ivsize = crypto_aead_ivsize(authenc_esn); |
397 | unsigned int cryptlen = req->cryptlen; | |
398 | struct page *dstp; | |
399 | u8 *vdst; | |
400 | u8 *hash; | |
401 | ||
402 | dstp = sg_page(dst); | |
403 | vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset; | |
404 | ||
405 | if (ivsize) { | |
406 | sg_init_table(cipher, 2); | |
407 | sg_set_buf(cipher, iv, ivsize); | |
408 | scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2); | |
409 | dst = cipher; | |
410 | cryptlen += ivsize; | |
411 | } | |
412 | ||
443c0d7e | 413 | if (assoc->length < 12) |
a5079d08 SK |
414 | return -EINVAL; |
415 | ||
416 | sg_init_table(hsg, 2); | |
443c0d7e HX |
417 | sg_set_page(hsg, sg_page(assoc), 4, assoc->offset); |
418 | sg_set_page(hsg + 1, sg_page(assoc), 4, assoc->offset + 8); | |
a5079d08 SK |
419 | |
420 | sg_init_table(tsg, 1); | |
443c0d7e | 421 | sg_set_page(tsg, sg_page(assoc), 4, assoc->offset + 4); |
a5079d08 SK |
422 | |
423 | areq_ctx->cryptlen = cryptlen; | |
443c0d7e HX |
424 | areq_ctx->headlen = 8; |
425 | areq_ctx->trailen = 4; | |
a5079d08 SK |
426 | areq_ctx->sg = dst; |
427 | ||
428 | areq_ctx->complete = authenc_esn_geniv_ahash_done; | |
429 | areq_ctx->update_complete = authenc_esn_geniv_ahash_update_done; | |
430 | areq_ctx->update_complete2 = authenc_esn_geniv_ahash_update_done2; | |
431 | ||
432 | hash = crypto_authenc_esn_ahash(req, flags); | |
433 | if (IS_ERR(hash)) | |
434 | return PTR_ERR(hash); | |
435 | ||
436 | scatterwalk_map_and_copy(hash, dst, cryptlen, | |
437 | crypto_aead_authsize(authenc_esn), 1); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | ||
442 | static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req, | |
443 | int err) | |
444 | { | |
445 | struct aead_request *areq = req->data; | |
446 | ||
447 | if (!err) { | |
448 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(areq); | |
449 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
450 | struct ablkcipher_request *abreq = aead_request_ctx(areq); | |
451 | u8 *iv = (u8 *)(abreq + 1) + | |
452 | crypto_ablkcipher_reqsize(ctx->enc); | |
453 | ||
454 | err = crypto_authenc_esn_genicv(areq, iv, 0); | |
455 | } | |
456 | ||
457 | authenc_esn_request_complete(areq, err); | |
458 | } | |
459 | ||
460 | static int crypto_authenc_esn_encrypt(struct aead_request *req) | |
461 | { | |
462 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
463 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
464 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
465 | struct crypto_ablkcipher *enc = ctx->enc; | |
466 | struct scatterlist *dst = req->dst; | |
467 | unsigned int cryptlen = req->cryptlen; | |
468 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail | |
469 | + ctx->reqoff); | |
470 | u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc); | |
471 | int err; | |
472 | ||
473 | ablkcipher_request_set_tfm(abreq, enc); | |
474 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
475 | crypto_authenc_esn_encrypt_done, req); | |
476 | ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv); | |
477 | ||
478 | memcpy(iv, req->iv, crypto_aead_ivsize(authenc_esn)); | |
479 | ||
480 | err = crypto_ablkcipher_encrypt(abreq); | |
481 | if (err) | |
482 | return err; | |
483 | ||
484 | return crypto_authenc_esn_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP); | |
485 | } | |
486 | ||
487 | static void crypto_authenc_esn_givencrypt_done(struct crypto_async_request *req, | |
488 | int err) | |
489 | { | |
490 | struct aead_request *areq = req->data; | |
491 | ||
492 | if (!err) { | |
493 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); | |
494 | ||
495 | err = crypto_authenc_esn_genicv(areq, greq->giv, 0); | |
496 | } | |
497 | ||
498 | authenc_esn_request_complete(areq, err); | |
499 | } | |
500 | ||
501 | static int crypto_authenc_esn_givencrypt(struct aead_givcrypt_request *req) | |
502 | { | |
503 | struct crypto_aead *authenc_esn = aead_givcrypt_reqtfm(req); | |
504 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
505 | struct aead_request *areq = &req->areq; | |
506 | struct skcipher_givcrypt_request *greq = aead_request_ctx(areq); | |
507 | u8 *iv = req->giv; | |
508 | int err; | |
509 | ||
510 | skcipher_givcrypt_set_tfm(greq, ctx->enc); | |
511 | skcipher_givcrypt_set_callback(greq, aead_request_flags(areq), | |
512 | crypto_authenc_esn_givencrypt_done, areq); | |
513 | skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen, | |
514 | areq->iv); | |
515 | skcipher_givcrypt_set_giv(greq, iv, req->seq); | |
516 | ||
517 | err = crypto_skcipher_givencrypt(greq); | |
518 | if (err) | |
519 | return err; | |
520 | ||
521 | return crypto_authenc_esn_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP); | |
522 | } | |
523 | ||
524 | static int crypto_authenc_esn_verify(struct aead_request *req) | |
525 | { | |
526 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
527 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
528 | u8 *ohash; | |
529 | u8 *ihash; | |
530 | unsigned int authsize; | |
531 | ||
532 | areq_ctx->complete = authenc_esn_verify_ahash_done; | |
533 | areq_ctx->update_complete = authenc_esn_verify_ahash_update_done; | |
534 | ||
535 | ohash = crypto_authenc_esn_ahash(req, CRYPTO_TFM_REQ_MAY_SLEEP); | |
536 | if (IS_ERR(ohash)) | |
537 | return PTR_ERR(ohash); | |
538 | ||
539 | authsize = crypto_aead_authsize(authenc_esn); | |
540 | ihash = ohash + authsize; | |
541 | scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen, | |
542 | authsize, 0); | |
6bf37e5a | 543 | return crypto_memneq(ihash, ohash, authsize) ? -EBADMSG : 0; |
a5079d08 SK |
544 | } |
545 | ||
546 | static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv, | |
547 | unsigned int cryptlen) | |
548 | { | |
549 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
550 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
551 | struct scatterlist *src = req->src; | |
552 | struct scatterlist *assoc = req->assoc; | |
553 | struct scatterlist *cipher = areq_ctx->cipher; | |
554 | struct scatterlist *hsg = areq_ctx->hsg; | |
555 | struct scatterlist *tsg = areq_ctx->tsg; | |
a5079d08 SK |
556 | unsigned int ivsize = crypto_aead_ivsize(authenc_esn); |
557 | struct page *srcp; | |
558 | u8 *vsrc; | |
559 | ||
560 | srcp = sg_page(src); | |
561 | vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset; | |
562 | ||
563 | if (ivsize) { | |
564 | sg_init_table(cipher, 2); | |
565 | sg_set_buf(cipher, iv, ivsize); | |
566 | scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2); | |
567 | src = cipher; | |
568 | cryptlen += ivsize; | |
569 | } | |
570 | ||
443c0d7e | 571 | if (assoc->length < 12) |
a5079d08 SK |
572 | return -EINVAL; |
573 | ||
574 | sg_init_table(hsg, 2); | |
443c0d7e HX |
575 | sg_set_page(hsg, sg_page(assoc), 4, assoc->offset); |
576 | sg_set_page(hsg + 1, sg_page(assoc), 4, assoc->offset + 8); | |
a5079d08 SK |
577 | |
578 | sg_init_table(tsg, 1); | |
443c0d7e | 579 | sg_set_page(tsg, sg_page(assoc), 4, assoc->offset + 4); |
a5079d08 SK |
580 | |
581 | areq_ctx->cryptlen = cryptlen; | |
443c0d7e HX |
582 | areq_ctx->headlen = 8; |
583 | areq_ctx->trailen = 4; | |
a5079d08 SK |
584 | areq_ctx->sg = src; |
585 | ||
586 | areq_ctx->complete = authenc_esn_verify_ahash_done; | |
587 | areq_ctx->update_complete = authenc_esn_verify_ahash_update_done; | |
588 | areq_ctx->update_complete2 = authenc_esn_verify_ahash_update_done2; | |
589 | ||
590 | return crypto_authenc_esn_verify(req); | |
591 | } | |
592 | ||
593 | static int crypto_authenc_esn_decrypt(struct aead_request *req) | |
594 | { | |
595 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
596 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
597 | struct ablkcipher_request *abreq = aead_request_ctx(req); | |
598 | unsigned int cryptlen = req->cryptlen; | |
599 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
600 | u8 *iv = req->iv; | |
601 | int err; | |
602 | ||
603 | if (cryptlen < authsize) | |
604 | return -EINVAL; | |
605 | cryptlen -= authsize; | |
606 | ||
607 | err = crypto_authenc_esn_iverify(req, iv, cryptlen); | |
608 | if (err) | |
609 | return err; | |
610 | ||
611 | ablkcipher_request_set_tfm(abreq, ctx->enc); | |
612 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
613 | req->base.complete, req->base.data); | |
614 | ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv); | |
615 | ||
616 | return crypto_ablkcipher_decrypt(abreq); | |
617 | } | |
618 | ||
619 | static int crypto_authenc_esn_init_tfm(struct crypto_tfm *tfm) | |
620 | { | |
621 | struct crypto_instance *inst = crypto_tfm_alg_instance(tfm); | |
622 | struct authenc_esn_instance_ctx *ictx = crypto_instance_ctx(inst); | |
623 | struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm); | |
624 | struct crypto_ahash *auth; | |
625 | struct crypto_ablkcipher *enc; | |
626 | int err; | |
627 | ||
628 | auth = crypto_spawn_ahash(&ictx->auth); | |
629 | if (IS_ERR(auth)) | |
630 | return PTR_ERR(auth); | |
631 | ||
632 | enc = crypto_spawn_skcipher(&ictx->enc); | |
633 | err = PTR_ERR(enc); | |
634 | if (IS_ERR(enc)) | |
635 | goto err_free_ahash; | |
636 | ||
637 | ctx->auth = auth; | |
638 | ctx->enc = enc; | |
639 | ||
640 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) + | |
641 | crypto_ahash_alignmask(auth), | |
642 | crypto_ahash_alignmask(auth) + 1) + | |
643 | crypto_ablkcipher_ivsize(enc); | |
644 | ||
6650d09b HX |
645 | crypto_aead_set_reqsize(__crypto_aead_cast(tfm), |
646 | sizeof(struct authenc_esn_request_ctx) + | |
647 | ctx->reqoff + | |
648 | max_t(unsigned int, | |
649 | crypto_ahash_reqsize(auth) + | |
650 | sizeof(struct ahash_request), | |
651 | sizeof(struct skcipher_givcrypt_request) + | |
652 | crypto_ablkcipher_reqsize(enc))); | |
a5079d08 SK |
653 | |
654 | return 0; | |
655 | ||
656 | err_free_ahash: | |
657 | crypto_free_ahash(auth); | |
658 | return err; | |
659 | } | |
660 | ||
661 | static void crypto_authenc_esn_exit_tfm(struct crypto_tfm *tfm) | |
662 | { | |
663 | struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm); | |
664 | ||
665 | crypto_free_ahash(ctx->auth); | |
666 | crypto_free_ablkcipher(ctx->enc); | |
667 | } | |
668 | ||
669 | static struct crypto_instance *crypto_authenc_esn_alloc(struct rtattr **tb) | |
670 | { | |
671 | struct crypto_attr_type *algt; | |
672 | struct crypto_instance *inst; | |
673 | struct hash_alg_common *auth; | |
674 | struct crypto_alg *auth_base; | |
675 | struct crypto_alg *enc; | |
676 | struct authenc_esn_instance_ctx *ctx; | |
677 | const char *enc_name; | |
678 | int err; | |
679 | ||
680 | algt = crypto_get_attr_type(tb); | |
a5079d08 | 681 | if (IS_ERR(algt)) |
3e8afe35 | 682 | return ERR_CAST(algt); |
a5079d08 SK |
683 | |
684 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) | |
685 | return ERR_PTR(-EINVAL); | |
686 | ||
687 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, | |
688 | CRYPTO_ALG_TYPE_AHASH_MASK); | |
689 | if (IS_ERR(auth)) | |
690 | return ERR_CAST(auth); | |
691 | ||
692 | auth_base = &auth->base; | |
693 | ||
694 | enc_name = crypto_attr_alg_name(tb[2]); | |
695 | err = PTR_ERR(enc_name); | |
696 | if (IS_ERR(enc_name)) | |
697 | goto out_put_auth; | |
698 | ||
699 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); | |
700 | err = -ENOMEM; | |
701 | if (!inst) | |
702 | goto out_put_auth; | |
703 | ||
704 | ctx = crypto_instance_ctx(inst); | |
705 | ||
706 | err = crypto_init_ahash_spawn(&ctx->auth, auth, inst); | |
707 | if (err) | |
708 | goto err_free_inst; | |
709 | ||
710 | crypto_set_skcipher_spawn(&ctx->enc, inst); | |
711 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, | |
712 | crypto_requires_sync(algt->type, | |
713 | algt->mask)); | |
714 | if (err) | |
715 | goto err_drop_auth; | |
716 | ||
717 | enc = crypto_skcipher_spawn_alg(&ctx->enc); | |
718 | ||
719 | err = -ENAMETOOLONG; | |
720 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
721 | "authencesn(%s,%s)", auth_base->cra_name, enc->cra_name) >= | |
722 | CRYPTO_MAX_ALG_NAME) | |
723 | goto err_drop_enc; | |
724 | ||
725 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
726 | "authencesn(%s,%s)", auth_base->cra_driver_name, | |
727 | enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
728 | goto err_drop_enc; | |
729 | ||
730 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; | |
731 | inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC; | |
732 | inst->alg.cra_priority = enc->cra_priority * | |
733 | 10 + auth_base->cra_priority; | |
734 | inst->alg.cra_blocksize = enc->cra_blocksize; | |
735 | inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask; | |
736 | inst->alg.cra_type = &crypto_aead_type; | |
737 | ||
738 | inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize; | |
739 | inst->alg.cra_aead.maxauthsize = auth->digestsize; | |
740 | ||
741 | inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx); | |
742 | ||
743 | inst->alg.cra_init = crypto_authenc_esn_init_tfm; | |
744 | inst->alg.cra_exit = crypto_authenc_esn_exit_tfm; | |
745 | ||
746 | inst->alg.cra_aead.setkey = crypto_authenc_esn_setkey; | |
747 | inst->alg.cra_aead.encrypt = crypto_authenc_esn_encrypt; | |
748 | inst->alg.cra_aead.decrypt = crypto_authenc_esn_decrypt; | |
749 | inst->alg.cra_aead.givencrypt = crypto_authenc_esn_givencrypt; | |
750 | ||
751 | out: | |
752 | crypto_mod_put(auth_base); | |
753 | return inst; | |
754 | ||
755 | err_drop_enc: | |
756 | crypto_drop_skcipher(&ctx->enc); | |
757 | err_drop_auth: | |
758 | crypto_drop_ahash(&ctx->auth); | |
759 | err_free_inst: | |
760 | kfree(inst); | |
761 | out_put_auth: | |
762 | inst = ERR_PTR(err); | |
763 | goto out; | |
764 | } | |
765 | ||
766 | static void crypto_authenc_esn_free(struct crypto_instance *inst) | |
767 | { | |
768 | struct authenc_esn_instance_ctx *ctx = crypto_instance_ctx(inst); | |
769 | ||
770 | crypto_drop_skcipher(&ctx->enc); | |
771 | crypto_drop_ahash(&ctx->auth); | |
772 | kfree(inst); | |
773 | } | |
774 | ||
775 | static struct crypto_template crypto_authenc_esn_tmpl = { | |
776 | .name = "authencesn", | |
777 | .alloc = crypto_authenc_esn_alloc, | |
778 | .free = crypto_authenc_esn_free, | |
779 | .module = THIS_MODULE, | |
780 | }; | |
781 | ||
782 | static int __init crypto_authenc_esn_module_init(void) | |
783 | { | |
784 | return crypto_register_template(&crypto_authenc_esn_tmpl); | |
785 | } | |
786 | ||
787 | static void __exit crypto_authenc_esn_module_exit(void) | |
788 | { | |
789 | crypto_unregister_template(&crypto_authenc_esn_tmpl); | |
790 | } | |
791 | ||
792 | module_init(crypto_authenc_esn_module_init); | |
793 | module_exit(crypto_authenc_esn_module_exit); | |
794 | ||
795 | MODULE_LICENSE("GPL"); | |
796 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
797 | MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers"); | |
4943ba16 | 798 | MODULE_ALIAS_CRYPTO("authencesn"); |