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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 | * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option) | |
12 | * any later version. | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <crypto/internal/aead.h> | |
17 | #include <crypto/internal/hash.h> | |
18 | #include <crypto/internal/skcipher.h> | |
19 | #include <crypto/authenc.h> | |
20 | #include <crypto/null.h> | |
21 | #include <crypto/scatterwalk.h> | |
22 | #include <linux/err.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/rtnetlink.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/spinlock.h> | |
29 | ||
30 | struct authenc_esn_instance_ctx { | |
31 | struct crypto_ahash_spawn auth; | |
32 | struct crypto_skcipher_spawn enc; | |
33 | }; | |
34 | ||
35 | struct crypto_authenc_esn_ctx { | |
36 | unsigned int reqoff; | |
37 | struct crypto_ahash *auth; | |
38 | struct crypto_skcipher *enc; | |
39 | struct crypto_skcipher *null; | |
40 | }; | |
41 | ||
42 | struct authenc_esn_request_ctx { | |
43 | struct scatterlist src[2]; | |
44 | struct scatterlist dst[2]; | |
45 | char tail[]; | |
46 | }; | |
47 | ||
48 | static void authenc_esn_request_complete(struct aead_request *req, int err) | |
49 | { | |
50 | if (err != -EINPROGRESS) | |
51 | aead_request_complete(req, err); | |
52 | } | |
53 | ||
54 | static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn, | |
55 | unsigned int authsize) | |
56 | { | |
57 | if (authsize > 0 && authsize < 4) | |
58 | return -EINVAL; | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key, | |
64 | unsigned int keylen) | |
65 | { | |
66 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
67 | struct crypto_ahash *auth = ctx->auth; | |
68 | struct crypto_skcipher *enc = ctx->enc; | |
69 | struct crypto_authenc_keys keys; | |
70 | int err = -EINVAL; | |
71 | ||
72 | if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) | |
73 | goto badkey; | |
74 | ||
75 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); | |
76 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) & | |
77 | CRYPTO_TFM_REQ_MASK); | |
78 | err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); | |
79 | crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) & | |
80 | CRYPTO_TFM_RES_MASK); | |
81 | ||
82 | if (err) | |
83 | goto out; | |
84 | ||
85 | crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); | |
86 | crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) & | |
87 | CRYPTO_TFM_REQ_MASK); | |
88 | err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen); | |
89 | crypto_aead_set_flags(authenc_esn, crypto_skcipher_get_flags(enc) & | |
90 | CRYPTO_TFM_RES_MASK); | |
91 | ||
92 | out: | |
93 | return err; | |
94 | ||
95 | badkey: | |
96 | crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
97 | goto out; | |
98 | } | |
99 | ||
100 | static int crypto_authenc_esn_genicv_tail(struct aead_request *req, | |
101 | unsigned int flags) | |
102 | { | |
103 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
104 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
105 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
106 | struct crypto_ahash *auth = ctx->auth; | |
107 | u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
108 | crypto_ahash_alignmask(auth) + 1); | |
109 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
110 | unsigned int assoclen = req->assoclen; | |
111 | unsigned int cryptlen = req->cryptlen; | |
112 | struct scatterlist *dst = req->dst; | |
113 | u32 tmp[2]; | |
114 | ||
115 | /* Move high-order bits of sequence number back. */ | |
116 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 0); | |
117 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0); | |
118 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 1); | |
119 | ||
120 | scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq, | |
125 | int err) | |
126 | { | |
127 | struct aead_request *req = areq->data; | |
128 | ||
129 | err = err ?: crypto_authenc_esn_genicv_tail(req, 0); | |
130 | aead_request_complete(req, err); | |
131 | } | |
132 | ||
133 | static int crypto_authenc_esn_genicv(struct aead_request *req, | |
134 | unsigned int flags) | |
135 | { | |
136 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
137 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
138 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
139 | struct crypto_ahash *auth = ctx->auth; | |
140 | u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
141 | crypto_ahash_alignmask(auth) + 1); | |
142 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
143 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
144 | unsigned int assoclen = req->assoclen; | |
145 | unsigned int cryptlen = req->cryptlen; | |
146 | struct scatterlist *dst = req->dst; | |
147 | u32 tmp[2]; | |
148 | ||
149 | if (!authsize) | |
150 | return 0; | |
151 | ||
152 | /* Move high-order bits of sequence number to the end. */ | |
153 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 0); | |
154 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 1); | |
155 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1); | |
156 | ||
157 | sg_init_table(areq_ctx->dst, 2); | |
158 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4); | |
159 | ||
160 | ahash_request_set_tfm(ahreq, auth); | |
161 | ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen); | |
162 | ahash_request_set_callback(ahreq, flags, | |
163 | authenc_esn_geniv_ahash_done, req); | |
164 | ||
165 | return crypto_ahash_digest(ahreq) ?: | |
166 | crypto_authenc_esn_genicv_tail(req, aead_request_flags(req)); | |
167 | } | |
168 | ||
169 | ||
170 | static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req, | |
171 | int err) | |
172 | { | |
173 | struct aead_request *areq = req->data; | |
174 | ||
175 | if (!err) | |
176 | err = crypto_authenc_esn_genicv(areq, 0); | |
177 | ||
178 | authenc_esn_request_complete(areq, err); | |
179 | } | |
180 | ||
181 | static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len) | |
182 | { | |
183 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
184 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
185 | SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null); | |
186 | ||
187 | skcipher_request_set_tfm(skreq, ctx->null); | |
188 | skcipher_request_set_callback(skreq, aead_request_flags(req), | |
189 | NULL, NULL); | |
190 | skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL); | |
191 | ||
192 | return crypto_skcipher_encrypt(skreq); | |
193 | } | |
194 | ||
195 | static int crypto_authenc_esn_encrypt(struct aead_request *req) | |
196 | { | |
197 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
198 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
199 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
200 | struct skcipher_request *skreq = (void *)(areq_ctx->tail + | |
201 | ctx->reqoff); | |
202 | struct crypto_skcipher *enc = ctx->enc; | |
203 | unsigned int assoclen = req->assoclen; | |
204 | unsigned int cryptlen = req->cryptlen; | |
205 | struct scatterlist *src, *dst; | |
206 | int err; | |
207 | ||
208 | sg_init_table(areq_ctx->src, 2); | |
209 | src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen); | |
210 | dst = src; | |
211 | ||
212 | if (req->src != req->dst) { | |
213 | err = crypto_authenc_esn_copy(req, assoclen); | |
214 | if (err) | |
215 | return err; | |
216 | ||
217 | sg_init_table(areq_ctx->dst, 2); | |
218 | dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen); | |
219 | } | |
220 | ||
221 | skcipher_request_set_tfm(skreq, enc); | |
222 | skcipher_request_set_callback(skreq, aead_request_flags(req), | |
223 | crypto_authenc_esn_encrypt_done, req); | |
224 | skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv); | |
225 | ||
226 | err = crypto_skcipher_encrypt(skreq); | |
227 | if (err) | |
228 | return err; | |
229 | ||
230 | return crypto_authenc_esn_genicv(req, aead_request_flags(req)); | |
231 | } | |
232 | ||
233 | static int crypto_authenc_esn_decrypt_tail(struct aead_request *req, | |
234 | unsigned int flags) | |
235 | { | |
236 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
237 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
238 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
239 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
240 | struct skcipher_request *skreq = (void *)(areq_ctx->tail + | |
241 | ctx->reqoff); | |
242 | struct crypto_ahash *auth = ctx->auth; | |
243 | u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
244 | crypto_ahash_alignmask(auth) + 1); | |
245 | unsigned int cryptlen = req->cryptlen - authsize; | |
246 | unsigned int assoclen = req->assoclen; | |
247 | struct scatterlist *dst = req->dst; | |
248 | u8 *ihash = ohash + crypto_ahash_digestsize(auth); | |
249 | u32 tmp[2]; | |
250 | ||
251 | if (!authsize) | |
252 | goto decrypt; | |
253 | ||
254 | /* Move high-order bits of sequence number back. */ | |
255 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 0); | |
256 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0); | |
257 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 1); | |
258 | ||
259 | if (crypto_memneq(ihash, ohash, authsize)) | |
260 | return -EBADMSG; | |
261 | ||
262 | decrypt: | |
263 | ||
264 | sg_init_table(areq_ctx->dst, 2); | |
265 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen); | |
266 | ||
267 | skcipher_request_set_tfm(skreq, ctx->enc); | |
268 | skcipher_request_set_callback(skreq, flags, | |
269 | req->base.complete, req->base.data); | |
270 | skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv); | |
271 | ||
272 | return crypto_skcipher_decrypt(skreq); | |
273 | } | |
274 | ||
275 | static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq, | |
276 | int err) | |
277 | { | |
278 | struct aead_request *req = areq->data; | |
279 | ||
280 | err = err ?: crypto_authenc_esn_decrypt_tail(req, 0); | |
281 | aead_request_complete(req, err); | |
282 | } | |
283 | ||
284 | static int crypto_authenc_esn_decrypt(struct aead_request *req) | |
285 | { | |
286 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
287 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
288 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
289 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
290 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
291 | struct crypto_ahash *auth = ctx->auth; | |
292 | u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
293 | crypto_ahash_alignmask(auth) + 1); | |
294 | unsigned int assoclen = req->assoclen; | |
295 | unsigned int cryptlen = req->cryptlen; | |
296 | u8 *ihash = ohash + crypto_ahash_digestsize(auth); | |
297 | struct scatterlist *dst = req->dst; | |
298 | u32 tmp[2]; | |
299 | int err; | |
300 | ||
301 | cryptlen -= authsize; | |
302 | ||
303 | if (req->src != dst) { | |
304 | err = crypto_authenc_esn_copy(req, assoclen + cryptlen); | |
305 | if (err) | |
306 | return err; | |
307 | } | |
308 | ||
309 | scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen, | |
310 | authsize, 0); | |
311 | ||
312 | if (!authsize) | |
313 | goto tail; | |
314 | ||
315 | /* Move high-order bits of sequence number to the end. */ | |
316 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 0); | |
317 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 1); | |
318 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1); | |
319 | ||
320 | sg_init_table(areq_ctx->dst, 2); | |
321 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4); | |
322 | ||
323 | ahash_request_set_tfm(ahreq, auth); | |
324 | ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen); | |
325 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
326 | authenc_esn_verify_ahash_done, req); | |
327 | ||
328 | err = crypto_ahash_digest(ahreq); | |
329 | if (err) | |
330 | return err; | |
331 | ||
332 | tail: | |
333 | return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req)); | |
334 | } | |
335 | ||
336 | static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm) | |
337 | { | |
338 | struct aead_instance *inst = aead_alg_instance(tfm); | |
339 | struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst); | |
340 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm); | |
341 | struct crypto_ahash *auth; | |
342 | struct crypto_skcipher *enc; | |
343 | struct crypto_skcipher *null; | |
344 | int err; | |
345 | ||
346 | auth = crypto_spawn_ahash(&ictx->auth); | |
347 | if (IS_ERR(auth)) | |
348 | return PTR_ERR(auth); | |
349 | ||
350 | enc = crypto_spawn_skcipher(&ictx->enc); | |
351 | err = PTR_ERR(enc); | |
352 | if (IS_ERR(enc)) | |
353 | goto err_free_ahash; | |
354 | ||
355 | null = crypto_get_default_null_skcipher2(); | |
356 | err = PTR_ERR(null); | |
357 | if (IS_ERR(null)) | |
358 | goto err_free_skcipher; | |
359 | ||
360 | ctx->auth = auth; | |
361 | ctx->enc = enc; | |
362 | ctx->null = null; | |
363 | ||
364 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth), | |
365 | crypto_ahash_alignmask(auth) + 1); | |
366 | ||
367 | crypto_aead_set_reqsize( | |
368 | tfm, | |
369 | sizeof(struct authenc_esn_request_ctx) + | |
370 | ctx->reqoff + | |
371 | max_t(unsigned int, | |
372 | crypto_ahash_reqsize(auth) + | |
373 | sizeof(struct ahash_request), | |
374 | sizeof(struct skcipher_request) + | |
375 | crypto_skcipher_reqsize(enc))); | |
376 | ||
377 | return 0; | |
378 | ||
379 | err_free_skcipher: | |
380 | crypto_free_skcipher(enc); | |
381 | err_free_ahash: | |
382 | crypto_free_ahash(auth); | |
383 | return err; | |
384 | } | |
385 | ||
386 | static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm) | |
387 | { | |
388 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm); | |
389 | ||
390 | crypto_free_ahash(ctx->auth); | |
391 | crypto_free_skcipher(ctx->enc); | |
392 | crypto_put_default_null_skcipher2(); | |
393 | } | |
394 | ||
395 | static void crypto_authenc_esn_free(struct aead_instance *inst) | |
396 | { | |
397 | struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst); | |
398 | ||
399 | crypto_drop_skcipher(&ctx->enc); | |
400 | crypto_drop_ahash(&ctx->auth); | |
401 | kfree(inst); | |
402 | } | |
403 | ||
404 | static int crypto_authenc_esn_create(struct crypto_template *tmpl, | |
405 | struct rtattr **tb) | |
406 | { | |
407 | struct crypto_attr_type *algt; | |
408 | struct aead_instance *inst; | |
409 | struct hash_alg_common *auth; | |
410 | struct crypto_alg *auth_base; | |
411 | struct skcipher_alg *enc; | |
412 | struct authenc_esn_instance_ctx *ctx; | |
413 | const char *enc_name; | |
414 | int err; | |
415 | ||
416 | algt = crypto_get_attr_type(tb); | |
417 | if (IS_ERR(algt)) | |
418 | return PTR_ERR(algt); | |
419 | ||
420 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) | |
421 | return -EINVAL; | |
422 | ||
423 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, | |
424 | CRYPTO_ALG_TYPE_AHASH_MASK | | |
425 | crypto_requires_sync(algt->type, algt->mask)); | |
426 | if (IS_ERR(auth)) | |
427 | return PTR_ERR(auth); | |
428 | ||
429 | auth_base = &auth->base; | |
430 | ||
431 | enc_name = crypto_attr_alg_name(tb[2]); | |
432 | err = PTR_ERR(enc_name); | |
433 | if (IS_ERR(enc_name)) | |
434 | goto out_put_auth; | |
435 | ||
436 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); | |
437 | err = -ENOMEM; | |
438 | if (!inst) | |
439 | goto out_put_auth; | |
440 | ||
441 | ctx = aead_instance_ctx(inst); | |
442 | ||
443 | err = crypto_init_ahash_spawn(&ctx->auth, auth, | |
444 | aead_crypto_instance(inst)); | |
445 | if (err) | |
446 | goto err_free_inst; | |
447 | ||
448 | crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst)); | |
449 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, | |
450 | crypto_requires_sync(algt->type, | |
451 | algt->mask)); | |
452 | if (err) | |
453 | goto err_drop_auth; | |
454 | ||
455 | enc = crypto_spawn_skcipher_alg(&ctx->enc); | |
456 | ||
457 | err = -ENAMETOOLONG; | |
458 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
459 | "authencesn(%s,%s)", auth_base->cra_name, | |
460 | enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME) | |
461 | goto err_drop_enc; | |
462 | ||
463 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
464 | "authencesn(%s,%s)", auth_base->cra_driver_name, | |
465 | enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
466 | goto err_drop_enc; | |
467 | ||
468 | inst->alg.base.cra_flags = (auth_base->cra_flags | | |
469 | enc->base.cra_flags) & CRYPTO_ALG_ASYNC; | |
470 | inst->alg.base.cra_priority = enc->base.cra_priority * 10 + | |
471 | auth_base->cra_priority; | |
472 | inst->alg.base.cra_blocksize = enc->base.cra_blocksize; | |
473 | inst->alg.base.cra_alignmask = auth_base->cra_alignmask | | |
474 | enc->base.cra_alignmask; | |
475 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx); | |
476 | ||
477 | inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc); | |
478 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc); | |
479 | inst->alg.maxauthsize = auth->digestsize; | |
480 | ||
481 | inst->alg.init = crypto_authenc_esn_init_tfm; | |
482 | inst->alg.exit = crypto_authenc_esn_exit_tfm; | |
483 | ||
484 | inst->alg.setkey = crypto_authenc_esn_setkey; | |
485 | inst->alg.setauthsize = crypto_authenc_esn_setauthsize; | |
486 | inst->alg.encrypt = crypto_authenc_esn_encrypt; | |
487 | inst->alg.decrypt = crypto_authenc_esn_decrypt; | |
488 | ||
489 | inst->free = crypto_authenc_esn_free, | |
490 | ||
491 | err = aead_register_instance(tmpl, inst); | |
492 | if (err) | |
493 | goto err_drop_enc; | |
494 | ||
495 | out: | |
496 | crypto_mod_put(auth_base); | |
497 | return err; | |
498 | ||
499 | err_drop_enc: | |
500 | crypto_drop_skcipher(&ctx->enc); | |
501 | err_drop_auth: | |
502 | crypto_drop_ahash(&ctx->auth); | |
503 | err_free_inst: | |
504 | kfree(inst); | |
505 | out_put_auth: | |
506 | goto out; | |
507 | } | |
508 | ||
509 | static struct crypto_template crypto_authenc_esn_tmpl = { | |
510 | .name = "authencesn", | |
511 | .create = crypto_authenc_esn_create, | |
512 | .module = THIS_MODULE, | |
513 | }; | |
514 | ||
515 | static int __init crypto_authenc_esn_module_init(void) | |
516 | { | |
517 | return crypto_register_template(&crypto_authenc_esn_tmpl); | |
518 | } | |
519 | ||
520 | static void __exit crypto_authenc_esn_module_exit(void) | |
521 | { | |
522 | crypto_unregister_template(&crypto_authenc_esn_tmpl); | |
523 | } | |
524 | ||
525 | module_init(crypto_authenc_esn_module_init); | |
526 | module_exit(crypto_authenc_esn_module_exit); | |
527 | ||
528 | MODULE_LICENSE("GPL"); | |
529 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
530 | MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers"); | |
531 | MODULE_ALIAS_CRYPTO("authencesn"); |