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authorSteffen Klassert <steffen.klassert@secunet.com>2011-03-07 19:04:58 -0500
committerDavid S. Miller <davem@davemloft.net>2011-03-13 23:22:27 -0400
commita5079d084f8be781aae8a635cab4b179cfea4ebd (patch)
treeb2c19d6e9cfa9c47f653b6869b32eb0cd52c18b2 /crypto/authencesn.c
parent27b61ae2d73936554fcd07e77c3cc13bc88c41a9 (diff)
crypto: authencesn - Add algorithm to handle IPsec extended sequence numbers
ESP with separate encryption/authentication algorithms needs a special treatment for the associated data. This patch add a new algorithm that handles esp with extended sequence numbers. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'crypto/authencesn.c')
-rw-r--r--crypto/authencesn.c835
1 files changed, 835 insertions, 0 deletions
diff --git a/crypto/authencesn.c b/crypto/authencesn.c
new file mode 100644
index 000000000000..136b68b9d8d4
--- /dev/null
+++ b/crypto/authencesn.c
@@ -0,0 +1,835 @@
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
15#include <crypto/aead.h>
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
28struct authenc_esn_instance_ctx {
29 struct crypto_ahash_spawn auth;
30 struct crypto_skcipher_spawn enc;
31};
32
33struct crypto_authenc_esn_ctx {
34 unsigned int reqoff;
35 struct crypto_ahash *auth;
36 struct crypto_ablkcipher *enc;
37};
38
39struct 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
53static void authenc_esn_request_complete(struct aead_request *req, int err)
54{
55 if (err != -EINPROGRESS)
56 aead_request_complete(req, err);
57}
58
59static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
60 unsigned int keylen)
61{
62 unsigned int authkeylen;
63 unsigned int enckeylen;
64 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
65 struct crypto_ahash *auth = ctx->auth;
66 struct crypto_ablkcipher *enc = ctx->enc;
67 struct rtattr *rta = (void *)key;
68 struct crypto_authenc_key_param *param;
69 int err = -EINVAL;
70
71 if (!RTA_OK(rta, keylen))
72 goto badkey;
73 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
74 goto badkey;
75 if (RTA_PAYLOAD(rta) < sizeof(*param))
76 goto badkey;
77
78 param = RTA_DATA(rta);
79 enckeylen = be32_to_cpu(param->enckeylen);
80
81 key += RTA_ALIGN(rta->rta_len);
82 keylen -= RTA_ALIGN(rta->rta_len);
83
84 if (keylen < enckeylen)
85 goto badkey;
86
87 authkeylen = keylen - enckeylen;
88
89 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
90 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
91 CRYPTO_TFM_REQ_MASK);
92 err = crypto_ahash_setkey(auth, key, authkeylen);
93 crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
94 CRYPTO_TFM_RES_MASK);
95
96 if (err)
97 goto out;
98
99 crypto_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
100 crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
101 CRYPTO_TFM_REQ_MASK);
102 err = crypto_ablkcipher_setkey(enc, key + authkeylen, enckeylen);
103 crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_get_flags(enc) &
104 CRYPTO_TFM_RES_MASK);
105
106out:
107 return err;
108
109badkey:
110 crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
111 goto out;
112}
113
114static void authenc_esn_geniv_ahash_update_done(struct crypto_async_request *areq,
115 int err)
116{
117 struct aead_request *req = areq->data;
118 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
119 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
120 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
121 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
122
123 if (err)
124 goto out;
125
126 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
127 areq_ctx->cryptlen);
128 ahash_request_set_callback(ahreq, aead_request_flags(req) &
129 CRYPTO_TFM_REQ_MAY_SLEEP,
130 areq_ctx->update_complete2, req);
131
132 err = crypto_ahash_update(ahreq);
133 if (err)
134 goto out;
135
136 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
137 areq_ctx->trailen);
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_esn), 1);
149
150out:
151 authenc_esn_request_complete(req, err);
152}
153
154static void authenc_esn_geniv_ahash_update_done2(struct crypto_async_request *areq,
155 int err)
156{
157 struct aead_request *req = areq->data;
158 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
159 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
160 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
161 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
162
163 if (err)
164 goto out;
165
166 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
167 areq_ctx->trailen);
168 ahash_request_set_callback(ahreq, aead_request_flags(req) &
169 CRYPTO_TFM_REQ_MAY_SLEEP,
170 areq_ctx->complete, req);
171
172 err = crypto_ahash_finup(ahreq);
173 if (err)
174 goto out;
175
176 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
177 areq_ctx->cryptlen,
178 crypto_aead_authsize(authenc_esn), 1);
179
180out:
181 authenc_esn_request_complete(req, err);
182}
183
184
185static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
186 int err)
187{
188 struct aead_request *req = areq->data;
189 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
190 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
191 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
192 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
193
194 if (err)
195 goto out;
196
197 scatterwalk_map_and_copy(ahreq->result, areq_ctx->sg,
198 areq_ctx->cryptlen,
199 crypto_aead_authsize(authenc_esn), 1);
200
201out:
202 aead_request_complete(req, err);
203}
204
205
206static void authenc_esn_verify_ahash_update_done(struct crypto_async_request *areq,
207 int err)
208{
209 u8 *ihash;
210 unsigned int authsize;
211 struct ablkcipher_request *abreq;
212 struct aead_request *req = areq->data;
213 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
214 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
215 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
216 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
217 unsigned int cryptlen = req->cryptlen;
218
219 if (err)
220 goto out;
221
222 ahash_request_set_crypt(ahreq, areq_ctx->sg, ahreq->result,
223 areq_ctx->cryptlen);
224
225 ahash_request_set_callback(ahreq,
226 aead_request_flags(req) &
227 CRYPTO_TFM_REQ_MAY_SLEEP,
228 areq_ctx->update_complete2, req);
229
230 err = crypto_ahash_update(ahreq);
231 if (err)
232 goto out;
233
234 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
235 areq_ctx->trailen);
236 ahash_request_set_callback(ahreq, aead_request_flags(req) &
237 CRYPTO_TFM_REQ_MAY_SLEEP,
238 areq_ctx->complete, req);
239
240 err = crypto_ahash_finup(ahreq);
241 if (err)
242 goto out;
243
244 authsize = crypto_aead_authsize(authenc_esn);
245 cryptlen -= authsize;
246 ihash = ahreq->result + authsize;
247 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
248 authsize, 0);
249
250 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
251 if (err)
252 goto out;
253
254 abreq = aead_request_ctx(req);
255 ablkcipher_request_set_tfm(abreq, ctx->enc);
256 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
257 req->base.complete, req->base.data);
258 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
259 cryptlen, req->iv);
260
261 err = crypto_ablkcipher_decrypt(abreq);
262
263out:
264 authenc_esn_request_complete(req, err);
265}
266
267static void authenc_esn_verify_ahash_update_done2(struct crypto_async_request *areq,
268 int err)
269{
270 u8 *ihash;
271 unsigned int authsize;
272 struct ablkcipher_request *abreq;
273 struct aead_request *req = areq->data;
274 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
275 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
276 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
277 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
278 unsigned int cryptlen = req->cryptlen;
279
280 if (err)
281 goto out;
282
283 ahash_request_set_crypt(ahreq, areq_ctx->tsg, ahreq->result,
284 areq_ctx->trailen);
285 ahash_request_set_callback(ahreq, aead_request_flags(req) &
286 CRYPTO_TFM_REQ_MAY_SLEEP,
287 areq_ctx->complete, req);
288
289 err = crypto_ahash_finup(ahreq);
290 if (err)
291 goto out;
292
293 authsize = crypto_aead_authsize(authenc_esn);
294 cryptlen -= authsize;
295 ihash = ahreq->result + authsize;
296 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
297 authsize, 0);
298
299 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
300 if (err)
301 goto out;
302
303 abreq = aead_request_ctx(req);
304 ablkcipher_request_set_tfm(abreq, ctx->enc);
305 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
306 req->base.complete, req->base.data);
307 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
308 cryptlen, req->iv);
309
310 err = crypto_ablkcipher_decrypt(abreq);
311
312out:
313 authenc_esn_request_complete(req, err);
314}
315
316
317static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
318 int err)
319{
320 u8 *ihash;
321 unsigned int authsize;
322 struct ablkcipher_request *abreq;
323 struct aead_request *req = areq->data;
324 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
325 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
326 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
327 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
328 unsigned int cryptlen = req->cryptlen;
329
330 if (err)
331 goto out;
332
333 authsize = crypto_aead_authsize(authenc_esn);
334 cryptlen -= authsize;
335 ihash = ahreq->result + authsize;
336 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
337 authsize, 0);
338
339 err = memcmp(ihash, ahreq->result, authsize) ? -EBADMSG : 0;
340 if (err)
341 goto out;
342
343 abreq = aead_request_ctx(req);
344 ablkcipher_request_set_tfm(abreq, ctx->enc);
345 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
346 req->base.complete, req->base.data);
347 ablkcipher_request_set_crypt(abreq, req->src, req->dst,
348 cryptlen, req->iv);
349
350 err = crypto_ablkcipher_decrypt(abreq);
351
352out:
353 authenc_esn_request_complete(req, err);
354}
355
356static u8 *crypto_authenc_esn_ahash(struct aead_request *req,
357 unsigned int flags)
358{
359 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
360 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
361 struct crypto_ahash *auth = ctx->auth;
362 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
363 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
364 u8 *hash = areq_ctx->tail;
365 int err;
366
367 hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth),
368 crypto_ahash_alignmask(auth) + 1);
369
370 ahash_request_set_tfm(ahreq, auth);
371
372 err = crypto_ahash_init(ahreq);
373 if (err)
374 return ERR_PTR(err);
375
376 ahash_request_set_crypt(ahreq, areq_ctx->hsg, hash, areq_ctx->headlen);
377 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
378 areq_ctx->update_complete, req);
379
380 err = crypto_ahash_update(ahreq);
381 if (err)
382 return ERR_PTR(err);
383
384 ahash_request_set_crypt(ahreq, areq_ctx->sg, hash, areq_ctx->cryptlen);
385 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
386 areq_ctx->update_complete2, req);
387
388 err = crypto_ahash_update(ahreq);
389 if (err)
390 return ERR_PTR(err);
391
392 ahash_request_set_crypt(ahreq, areq_ctx->tsg, hash,
393 areq_ctx->trailen);
394 ahash_request_set_callback(ahreq, aead_request_flags(req) & flags,
395 areq_ctx->complete, req);
396
397 err = crypto_ahash_finup(ahreq);
398 if (err)
399 return ERR_PTR(err);
400
401 return hash;
402}
403
404static int crypto_authenc_esn_genicv(struct aead_request *req, u8 *iv,
405 unsigned int flags)
406{
407 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
408 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
409 struct scatterlist *dst = req->dst;
410 struct scatterlist *assoc = req->assoc;
411 struct scatterlist *cipher = areq_ctx->cipher;
412 struct scatterlist *hsg = areq_ctx->hsg;
413 struct scatterlist *tsg = areq_ctx->tsg;
414 struct scatterlist *assoc1;
415 struct scatterlist *assoc2;
416 unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
417 unsigned int cryptlen = req->cryptlen;
418 struct page *dstp;
419 u8 *vdst;
420 u8 *hash;
421
422 dstp = sg_page(dst);
423 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
424
425 if (ivsize) {
426 sg_init_table(cipher, 2);
427 sg_set_buf(cipher, iv, ivsize);
428 scatterwalk_crypto_chain(cipher, dst, vdst == iv + ivsize, 2);
429 dst = cipher;
430 cryptlen += ivsize;
431 }
432
433 if (sg_is_last(assoc))
434 return -EINVAL;
435
436 assoc1 = assoc + 1;
437 if (sg_is_last(assoc1))
438 return -EINVAL;
439
440 assoc2 = assoc + 2;
441 if (!sg_is_last(assoc2))
442 return -EINVAL;
443
444 sg_init_table(hsg, 2);
445 sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset);
446 sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset);
447
448 sg_init_table(tsg, 1);
449 sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset);
450
451 areq_ctx->cryptlen = cryptlen;
452 areq_ctx->headlen = assoc->length + assoc2->length;
453 areq_ctx->trailen = assoc1->length;
454 areq_ctx->sg = dst;
455
456 areq_ctx->complete = authenc_esn_geniv_ahash_done;
457 areq_ctx->update_complete = authenc_esn_geniv_ahash_update_done;
458 areq_ctx->update_complete2 = authenc_esn_geniv_ahash_update_done2;
459
460 hash = crypto_authenc_esn_ahash(req, flags);
461 if (IS_ERR(hash))
462 return PTR_ERR(hash);
463
464 scatterwalk_map_and_copy(hash, dst, cryptlen,
465 crypto_aead_authsize(authenc_esn), 1);
466 return 0;
467}
468
469
470static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
471 int err)
472{
473 struct aead_request *areq = req->data;
474
475 if (!err) {
476 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(areq);
477 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
478 struct ablkcipher_request *abreq = aead_request_ctx(areq);
479 u8 *iv = (u8 *)(abreq + 1) +
480 crypto_ablkcipher_reqsize(ctx->enc);
481
482 err = crypto_authenc_esn_genicv(areq, iv, 0);
483 }
484
485 authenc_esn_request_complete(areq, err);
486}
487
488static int crypto_authenc_esn_encrypt(struct aead_request *req)
489{
490 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
491 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
492 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
493 struct crypto_ablkcipher *enc = ctx->enc;
494 struct scatterlist *dst = req->dst;
495 unsigned int cryptlen = req->cryptlen;
496 struct ablkcipher_request *abreq = (void *)(areq_ctx->tail
497 + ctx->reqoff);
498 u8 *iv = (u8 *)abreq - crypto_ablkcipher_ivsize(enc);
499 int err;
500
501 ablkcipher_request_set_tfm(abreq, enc);
502 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
503 crypto_authenc_esn_encrypt_done, req);
504 ablkcipher_request_set_crypt(abreq, req->src, dst, cryptlen, req->iv);
505
506 memcpy(iv, req->iv, crypto_aead_ivsize(authenc_esn));
507
508 err = crypto_ablkcipher_encrypt(abreq);
509 if (err)
510 return err;
511
512 return crypto_authenc_esn_genicv(req, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
513}
514
515static void crypto_authenc_esn_givencrypt_done(struct crypto_async_request *req,
516 int err)
517{
518 struct aead_request *areq = req->data;
519
520 if (!err) {
521 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
522
523 err = crypto_authenc_esn_genicv(areq, greq->giv, 0);
524 }
525
526 authenc_esn_request_complete(areq, err);
527}
528
529static int crypto_authenc_esn_givencrypt(struct aead_givcrypt_request *req)
530{
531 struct crypto_aead *authenc_esn = aead_givcrypt_reqtfm(req);
532 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
533 struct aead_request *areq = &req->areq;
534 struct skcipher_givcrypt_request *greq = aead_request_ctx(areq);
535 u8 *iv = req->giv;
536 int err;
537
538 skcipher_givcrypt_set_tfm(greq, ctx->enc);
539 skcipher_givcrypt_set_callback(greq, aead_request_flags(areq),
540 crypto_authenc_esn_givencrypt_done, areq);
541 skcipher_givcrypt_set_crypt(greq, areq->src, areq->dst, areq->cryptlen,
542 areq->iv);
543 skcipher_givcrypt_set_giv(greq, iv, req->seq);
544
545 err = crypto_skcipher_givencrypt(greq);
546 if (err)
547 return err;
548
549 return crypto_authenc_esn_genicv(areq, iv, CRYPTO_TFM_REQ_MAY_SLEEP);
550}
551
552static int crypto_authenc_esn_verify(struct aead_request *req)
553{
554 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
555 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
556 u8 *ohash;
557 u8 *ihash;
558 unsigned int authsize;
559
560 areq_ctx->complete = authenc_esn_verify_ahash_done;
561 areq_ctx->update_complete = authenc_esn_verify_ahash_update_done;
562
563 ohash = crypto_authenc_esn_ahash(req, CRYPTO_TFM_REQ_MAY_SLEEP);
564 if (IS_ERR(ohash))
565 return PTR_ERR(ohash);
566
567 authsize = crypto_aead_authsize(authenc_esn);
568 ihash = ohash + authsize;
569 scatterwalk_map_and_copy(ihash, areq_ctx->sg, areq_ctx->cryptlen,
570 authsize, 0);
571 return memcmp(ihash, ohash, authsize) ? -EBADMSG : 0;
572}
573
574static int crypto_authenc_esn_iverify(struct aead_request *req, u8 *iv,
575 unsigned int cryptlen)
576{
577 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
578 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
579 struct scatterlist *src = req->src;
580 struct scatterlist *assoc = req->assoc;
581 struct scatterlist *cipher = areq_ctx->cipher;
582 struct scatterlist *hsg = areq_ctx->hsg;
583 struct scatterlist *tsg = areq_ctx->tsg;
584 struct scatterlist *assoc1;
585 struct scatterlist *assoc2;
586 unsigned int ivsize = crypto_aead_ivsize(authenc_esn);
587 struct page *srcp;
588 u8 *vsrc;
589
590 srcp = sg_page(src);
591 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
592
593 if (ivsize) {
594 sg_init_table(cipher, 2);
595 sg_set_buf(cipher, iv, ivsize);
596 scatterwalk_crypto_chain(cipher, src, vsrc == iv + ivsize, 2);
597 src = cipher;
598 cryptlen += ivsize;
599 }
600
601 if (sg_is_last(assoc))
602 return -EINVAL;
603
604 assoc1 = assoc + 1;
605 if (sg_is_last(assoc1))
606 return -EINVAL;
607
608 assoc2 = assoc + 2;
609 if (!sg_is_last(assoc2))
610 return -EINVAL;
611
612 sg_init_table(hsg, 2);
613 sg_set_page(hsg, sg_page(assoc), assoc->length, assoc->offset);
614 sg_set_page(hsg + 1, sg_page(assoc2), assoc2->length, assoc2->offset);
615
616 sg_init_table(tsg, 1);
617 sg_set_page(tsg, sg_page(assoc1), assoc1->length, assoc1->offset);
618
619 areq_ctx->cryptlen = cryptlen;
620 areq_ctx->headlen = assoc->length + assoc2->length;
621 areq_ctx->trailen = assoc1->length;
622 areq_ctx->sg = src;
623
624 areq_ctx->complete = authenc_esn_verify_ahash_done;
625 areq_ctx->update_complete = authenc_esn_verify_ahash_update_done;
626 areq_ctx->update_complete2 = authenc_esn_verify_ahash_update_done2;
627
628 return crypto_authenc_esn_verify(req);
629}
630
631static int crypto_authenc_esn_decrypt(struct aead_request *req)
632{
633 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
634 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
635 struct ablkcipher_request *abreq = aead_request_ctx(req);
636 unsigned int cryptlen = req->cryptlen;
637 unsigned int authsize = crypto_aead_authsize(authenc_esn);
638 u8 *iv = req->iv;
639 int err;
640
641 if (cryptlen < authsize)
642 return -EINVAL;
643 cryptlen -= authsize;
644
645 err = crypto_authenc_esn_iverify(req, iv, cryptlen);
646 if (err)
647 return err;
648
649 ablkcipher_request_set_tfm(abreq, ctx->enc);
650 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
651 req->base.complete, req->base.data);
652 ablkcipher_request_set_crypt(abreq, req->src, req->dst, cryptlen, iv);
653
654 return crypto_ablkcipher_decrypt(abreq);
655}
656
657static int crypto_authenc_esn_init_tfm(struct crypto_tfm *tfm)
658{
659 struct crypto_instance *inst = crypto_tfm_alg_instance(tfm);
660 struct authenc_esn_instance_ctx *ictx = crypto_instance_ctx(inst);
661 struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm);
662 struct crypto_ahash *auth;
663 struct crypto_ablkcipher *enc;
664 int err;
665
666 auth = crypto_spawn_ahash(&ictx->auth);
667 if (IS_ERR(auth))
668 return PTR_ERR(auth);
669
670 enc = crypto_spawn_skcipher(&ictx->enc);
671 err = PTR_ERR(enc);
672 if (IS_ERR(enc))
673 goto err_free_ahash;
674
675 ctx->auth = auth;
676 ctx->enc = enc;
677
678 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth) +
679 crypto_ahash_alignmask(auth),
680 crypto_ahash_alignmask(auth) + 1) +
681 crypto_ablkcipher_ivsize(enc);
682
683 tfm->crt_aead.reqsize = sizeof(struct authenc_esn_request_ctx) +
684 ctx->reqoff +
685 max_t(unsigned int,
686 crypto_ahash_reqsize(auth) +
687 sizeof(struct ahash_request),
688 sizeof(struct skcipher_givcrypt_request) +
689 crypto_ablkcipher_reqsize(enc));
690
691 return 0;
692
693err_free_ahash:
694 crypto_free_ahash(auth);
695 return err;
696}
697
698static void crypto_authenc_esn_exit_tfm(struct crypto_tfm *tfm)
699{
700 struct crypto_authenc_esn_ctx *ctx = crypto_tfm_ctx(tfm);
701
702 crypto_free_ahash(ctx->auth);
703 crypto_free_ablkcipher(ctx->enc);
704}
705
706static struct crypto_instance *crypto_authenc_esn_alloc(struct rtattr **tb)
707{
708 struct crypto_attr_type *algt;
709 struct crypto_instance *inst;
710 struct hash_alg_common *auth;
711 struct crypto_alg *auth_base;
712 struct crypto_alg *enc;
713 struct authenc_esn_instance_ctx *ctx;
714 const char *enc_name;
715 int err;
716
717 algt = crypto_get_attr_type(tb);
718 err = PTR_ERR(algt);
719 if (IS_ERR(algt))
720 return ERR_PTR(err);
721
722 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
723 return ERR_PTR(-EINVAL);
724
725 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
726 CRYPTO_ALG_TYPE_AHASH_MASK);
727 if (IS_ERR(auth))
728 return ERR_CAST(auth);
729
730 auth_base = &auth->base;
731
732 enc_name = crypto_attr_alg_name(tb[2]);
733 err = PTR_ERR(enc_name);
734 if (IS_ERR(enc_name))
735 goto out_put_auth;
736
737 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
738 err = -ENOMEM;
739 if (!inst)
740 goto out_put_auth;
741
742 ctx = crypto_instance_ctx(inst);
743
744 err = crypto_init_ahash_spawn(&ctx->auth, auth, inst);
745 if (err)
746 goto err_free_inst;
747
748 crypto_set_skcipher_spawn(&ctx->enc, inst);
749 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
750 crypto_requires_sync(algt->type,
751 algt->mask));
752 if (err)
753 goto err_drop_auth;
754
755 enc = crypto_skcipher_spawn_alg(&ctx->enc);
756
757 err = -ENAMETOOLONG;
758 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
759 "authencesn(%s,%s)", auth_base->cra_name, enc->cra_name) >=
760 CRYPTO_MAX_ALG_NAME)
761 goto err_drop_enc;
762
763 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
764 "authencesn(%s,%s)", auth_base->cra_driver_name,
765 enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
766 goto err_drop_enc;
767
768 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
769 inst->alg.cra_flags |= enc->cra_flags & CRYPTO_ALG_ASYNC;
770 inst->alg.cra_priority = enc->cra_priority *
771 10 + auth_base->cra_priority;
772 inst->alg.cra_blocksize = enc->cra_blocksize;
773 inst->alg.cra_alignmask = auth_base->cra_alignmask | enc->cra_alignmask;
774 inst->alg.cra_type = &crypto_aead_type;
775
776 inst->alg.cra_aead.ivsize = enc->cra_ablkcipher.ivsize;
777 inst->alg.cra_aead.maxauthsize = auth->digestsize;
778
779 inst->alg.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
780
781 inst->alg.cra_init = crypto_authenc_esn_init_tfm;
782 inst->alg.cra_exit = crypto_authenc_esn_exit_tfm;
783
784 inst->alg.cra_aead.setkey = crypto_authenc_esn_setkey;
785 inst->alg.cra_aead.encrypt = crypto_authenc_esn_encrypt;
786 inst->alg.cra_aead.decrypt = crypto_authenc_esn_decrypt;
787 inst->alg.cra_aead.givencrypt = crypto_authenc_esn_givencrypt;
788
789out:
790 crypto_mod_put(auth_base);
791 return inst;
792
793err_drop_enc:
794 crypto_drop_skcipher(&ctx->enc);
795err_drop_auth:
796 crypto_drop_ahash(&ctx->auth);
797err_free_inst:
798 kfree(inst);
799out_put_auth:
800 inst = ERR_PTR(err);
801 goto out;
802}
803
804static void crypto_authenc_esn_free(struct crypto_instance *inst)
805{
806 struct authenc_esn_instance_ctx *ctx = crypto_instance_ctx(inst);
807
808 crypto_drop_skcipher(&ctx->enc);
809 crypto_drop_ahash(&ctx->auth);
810 kfree(inst);
811}
812
813static struct crypto_template crypto_authenc_esn_tmpl = {
814 .name = "authencesn",
815 .alloc = crypto_authenc_esn_alloc,
816 .free = crypto_authenc_esn_free,
817 .module = THIS_MODULE,
818};
819
820static int __init crypto_authenc_esn_module_init(void)
821{
822 return crypto_register_template(&crypto_authenc_esn_tmpl);
823}
824
825static void __exit crypto_authenc_esn_module_exit(void)
826{
827 crypto_unregister_template(&crypto_authenc_esn_tmpl);
828}
829
830module_init(crypto_authenc_esn_module_init);
831module_exit(crypto_authenc_esn_module_exit);
832
833MODULE_LICENSE("GPL");
834MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
835MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 03:26:04 -0500