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Commit | Line | Data |
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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> | |
104880a6 | 7 | * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> |
a5079d08 SK |
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 | ||
7fb2a4bd | 16 | #include <crypto/internal/aead.h> |
a5079d08 SK |
17 | #include <crypto/internal/hash.h> |
18 | #include <crypto/internal/skcipher.h> | |
19 | #include <crypto/authenc.h> | |
104880a6 | 20 | #include <crypto/null.h> |
a5079d08 SK |
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_ablkcipher *enc; | |
104880a6 | 39 | struct crypto_blkcipher *null; |
a5079d08 SK |
40 | }; |
41 | ||
42 | struct authenc_esn_request_ctx { | |
104880a6 HX |
43 | struct scatterlist src[2]; |
44 | struct scatterlist dst[2]; | |
a5079d08 SK |
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 | ||
104880a6 HX |
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 | ||
a5079d08 SK |
63 | static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key, |
64 | unsigned int keylen) | |
65 | { | |
a5079d08 SK |
66 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
67 | struct crypto_ahash *auth = ctx->auth; | |
68 | struct crypto_ablkcipher *enc = ctx->enc; | |
fddc2c43 | 69 | struct crypto_authenc_keys keys; |
a5079d08 SK |
70 | int err = -EINVAL; |
71 | ||
fddc2c43 | 72 | if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) |
a5079d08 | 73 | goto badkey; |
a5079d08 SK |
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); | |
fddc2c43 | 78 | err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
a5079d08 SK |
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_ablkcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); | |
86 | crypto_ablkcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) & | |
87 | CRYPTO_TFM_REQ_MASK); | |
fddc2c43 | 88 | err = crypto_ablkcipher_setkey(enc, keys.enckey, keys.enckeylen); |
a5079d08 SK |
89 | crypto_aead_set_flags(authenc_esn, crypto_ablkcipher_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 | ||
104880a6 HX |
100 | static int crypto_authenc_esn_genicv_tail(struct aead_request *req, |
101 | unsigned int flags) | |
a5079d08 | 102 | { |
a5079d08 SK |
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); | |
104880a6 HX |
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]; | |
a5079d08 | 114 | |
104880a6 HX |
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); | |
a5079d08 | 119 | |
104880a6 HX |
120 | scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1); |
121 | return 0; | |
a5079d08 SK |
122 | } |
123 | ||
a5079d08 SK |
124 | static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq, |
125 | int err) | |
126 | { | |
127 | struct aead_request *req = areq->data; | |
a5079d08 | 128 | |
104880a6 | 129 | err = err ?: crypto_authenc_esn_genicv_tail(req, 0); |
a5079d08 SK |
130 | aead_request_complete(req, err); |
131 | } | |
132 | ||
104880a6 HX |
133 | static int crypto_authenc_esn_genicv(struct aead_request *req, |
134 | unsigned int flags) | |
a5079d08 | 135 | { |
a5079d08 | 136 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
a5079d08 | 137 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
a5079d08 | 138 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
104880a6 HX |
139 | struct crypto_ahash *auth = ctx->auth; |
140 | u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
141 | crypto_ahash_alignmask(auth) + 1); | |
a5079d08 | 142 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
104880a6 HX |
143 | unsigned int authsize = crypto_aead_authsize(authenc_esn); |
144 | unsigned int assoclen = req->assoclen; | |
a5079d08 | 145 | unsigned int cryptlen = req->cryptlen; |
104880a6 HX |
146 | struct scatterlist *dst = req->dst; |
147 | u32 tmp[2]; | |
a5079d08 | 148 | |
104880a6 HX |
149 | if (!authsize) |
150 | return 0; | |
a5079d08 | 151 | |
104880a6 HX |
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); | |
a5079d08 | 156 | |
104880a6 HX |
157 | sg_init_table(areq_ctx->dst, 2); |
158 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4); | |
a5079d08 | 159 | |
104880a6 HX |
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); | |
a5079d08 | 164 | |
104880a6 HX |
165 | return crypto_ahash_digest(ahreq) ?: |
166 | crypto_authenc_esn_genicv_tail(req, aead_request_flags(req)); | |
a5079d08 SK |
167 | } |
168 | ||
169 | ||
104880a6 HX |
170 | static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req, |
171 | int err) | |
a5079d08 | 172 | { |
104880a6 | 173 | struct aead_request *areq = req->data; |
a5079d08 | 174 | |
104880a6 HX |
175 | if (!err) |
176 | err = crypto_authenc_esn_genicv(areq, 0); | |
a5079d08 | 177 | |
104880a6 | 178 | authenc_esn_request_complete(areq, err); |
a5079d08 SK |
179 | } |
180 | ||
104880a6 | 181 | static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len) |
a5079d08 SK |
182 | { |
183 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
184 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
104880a6 HX |
185 | struct blkcipher_desc desc = { |
186 | .tfm = ctx->null, | |
187 | }; | |
a5079d08 | 188 | |
104880a6 | 189 | return crypto_blkcipher_encrypt(&desc, req->dst, req->src, len); |
a5079d08 SK |
190 | } |
191 | ||
104880a6 | 192 | static int crypto_authenc_esn_encrypt(struct aead_request *req) |
a5079d08 SK |
193 | { |
194 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
195 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
104880a6 HX |
196 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
197 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail | |
198 | + ctx->reqoff); | |
199 | struct crypto_ablkcipher *enc = ctx->enc; | |
200 | unsigned int assoclen = req->assoclen; | |
a5079d08 | 201 | unsigned int cryptlen = req->cryptlen; |
104880a6 HX |
202 | struct scatterlist *src, *dst; |
203 | int err; | |
a5079d08 | 204 | |
104880a6 HX |
205 | sg_init_table(areq_ctx->src, 2); |
206 | src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen); | |
207 | dst = src; | |
a5079d08 | 208 | |
104880a6 HX |
209 | if (req->src != req->dst) { |
210 | err = crypto_authenc_esn_copy(req, assoclen); | |
211 | if (err) | |
212 | return err; | |
a5079d08 | 213 | |
104880a6 HX |
214 | sg_init_table(areq_ctx->dst, 2); |
215 | dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen); | |
a5079d08 SK |
216 | } |
217 | ||
a5079d08 SK |
218 | ablkcipher_request_set_tfm(abreq, enc); |
219 | ablkcipher_request_set_callback(abreq, aead_request_flags(req), | |
220 | crypto_authenc_esn_encrypt_done, req); | |
104880a6 | 221 | ablkcipher_request_set_crypt(abreq, src, dst, cryptlen, req->iv); |
a5079d08 SK |
222 | |
223 | err = crypto_ablkcipher_encrypt(abreq); | |
224 | if (err) | |
225 | return err; | |
226 | ||
104880a6 | 227 | return crypto_authenc_esn_genicv(req, aead_request_flags(req)); |
a5079d08 SK |
228 | } |
229 | ||
104880a6 HX |
230 | static int crypto_authenc_esn_decrypt_tail(struct aead_request *req, |
231 | unsigned int flags) | |
a5079d08 | 232 | { |
104880a6 HX |
233 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
234 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
235 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
236 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
237 | struct ablkcipher_request *abreq = (void *)(areq_ctx->tail | |
238 | + ctx->reqoff); | |
239 | struct crypto_ahash *auth = ctx->auth; | |
240 | u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
241 | crypto_ahash_alignmask(auth) + 1); | |
242 | unsigned int cryptlen = req->cryptlen - authsize; | |
243 | unsigned int assoclen = req->assoclen; | |
244 | struct scatterlist *dst = req->dst; | |
245 | u8 *ihash = ohash + crypto_ahash_digestsize(auth); | |
246 | u32 tmp[2]; | |
a5079d08 | 247 | |
104880a6 HX |
248 | /* Move high-order bits of sequence number back. */ |
249 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 0); | |
250 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0); | |
251 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 1); | |
a5079d08 | 252 | |
104880a6 HX |
253 | if (crypto_memneq(ihash, ohash, authsize)) |
254 | return -EBADMSG; | |
a5079d08 | 255 | |
104880a6 HX |
256 | sg_init_table(areq_ctx->dst, 2); |
257 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen); | |
a5079d08 | 258 | |
104880a6 HX |
259 | ablkcipher_request_set_tfm(abreq, ctx->enc); |
260 | ablkcipher_request_set_callback(abreq, flags, | |
261 | req->base.complete, req->base.data); | |
262 | ablkcipher_request_set_crypt(abreq, dst, dst, cryptlen, req->iv); | |
a5079d08 | 263 | |
104880a6 | 264 | return crypto_ablkcipher_decrypt(abreq); |
a5079d08 SK |
265 | } |
266 | ||
104880a6 HX |
267 | static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq, |
268 | int err) | |
a5079d08 | 269 | { |
104880a6 | 270 | struct aead_request *req = areq->data; |
a5079d08 | 271 | |
104880a6 HX |
272 | err = err ?: crypto_authenc_esn_decrypt_tail(req, 0); |
273 | aead_request_complete(req, err); | |
a5079d08 SK |
274 | } |
275 | ||
104880a6 | 276 | static int crypto_authenc_esn_decrypt(struct aead_request *req) |
a5079d08 SK |
277 | { |
278 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
279 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
104880a6 HX |
280 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
281 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
282 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
283 | struct crypto_ahash *auth = ctx->auth; | |
284 | u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
285 | crypto_ahash_alignmask(auth) + 1); | |
286 | unsigned int assoclen = req->assoclen; | |
287 | unsigned int cryptlen = req->cryptlen; | |
288 | u8 *ihash = ohash + crypto_ahash_digestsize(auth); | |
289 | struct scatterlist *dst = req->dst; | |
290 | u32 tmp[2]; | |
291 | int err; | |
a5079d08 | 292 | |
104880a6 | 293 | cryptlen -= authsize; |
a5079d08 | 294 | |
104880a6 HX |
295 | if (req->src != dst) { |
296 | err = crypto_authenc_esn_copy(req, assoclen + cryptlen); | |
297 | if (err) | |
298 | return err; | |
299 | } | |
a5079d08 | 300 | |
104880a6 HX |
301 | scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen, |
302 | authsize, 0); | |
a5079d08 | 303 | |
104880a6 HX |
304 | if (!authsize) |
305 | goto tail; | |
a5079d08 | 306 | |
104880a6 HX |
307 | /* Move high-order bits of sequence number to the end. */ |
308 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 0); | |
309 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 1); | |
310 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1); | |
a5079d08 | 311 | |
104880a6 HX |
312 | sg_init_table(areq_ctx->dst, 2); |
313 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4); | |
a5079d08 | 314 | |
104880a6 HX |
315 | ahash_request_set_tfm(ahreq, auth); |
316 | ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen); | |
317 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
318 | authenc_esn_verify_ahash_done, req); | |
a5079d08 | 319 | |
104880a6 | 320 | err = crypto_ahash_digest(ahreq); |
a5079d08 SK |
321 | if (err) |
322 | return err; | |
323 | ||
104880a6 HX |
324 | tail: |
325 | return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req)); | |
a5079d08 SK |
326 | } |
327 | ||
104880a6 | 328 | static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm) |
a5079d08 | 329 | { |
104880a6 HX |
330 | struct aead_instance *inst = aead_alg_instance(tfm); |
331 | struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst); | |
332 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm); | |
a5079d08 SK |
333 | struct crypto_ahash *auth; |
334 | struct crypto_ablkcipher *enc; | |
104880a6 | 335 | struct crypto_blkcipher *null; |
a5079d08 SK |
336 | int err; |
337 | ||
338 | auth = crypto_spawn_ahash(&ictx->auth); | |
339 | if (IS_ERR(auth)) | |
340 | return PTR_ERR(auth); | |
341 | ||
342 | enc = crypto_spawn_skcipher(&ictx->enc); | |
343 | err = PTR_ERR(enc); | |
344 | if (IS_ERR(enc)) | |
345 | goto err_free_ahash; | |
346 | ||
104880a6 HX |
347 | null = crypto_get_default_null_skcipher(); |
348 | err = PTR_ERR(null); | |
349 | if (IS_ERR(null)) | |
350 | goto err_free_skcipher; | |
351 | ||
a5079d08 SK |
352 | ctx->auth = auth; |
353 | ctx->enc = enc; | |
104880a6 | 354 | ctx->null = null; |
a5079d08 | 355 | |
104880a6 HX |
356 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth), |
357 | crypto_ahash_alignmask(auth) + 1); | |
a5079d08 | 358 | |
104880a6 HX |
359 | crypto_aead_set_reqsize( |
360 | tfm, | |
6650d09b HX |
361 | sizeof(struct authenc_esn_request_ctx) + |
362 | ctx->reqoff + | |
363 | max_t(unsigned int, | |
364 | crypto_ahash_reqsize(auth) + | |
365 | sizeof(struct ahash_request), | |
366 | sizeof(struct skcipher_givcrypt_request) + | |
367 | crypto_ablkcipher_reqsize(enc))); | |
a5079d08 SK |
368 | |
369 | return 0; | |
370 | ||
104880a6 HX |
371 | err_free_skcipher: |
372 | crypto_free_ablkcipher(enc); | |
a5079d08 SK |
373 | err_free_ahash: |
374 | crypto_free_ahash(auth); | |
375 | return err; | |
376 | } | |
377 | ||
104880a6 | 378 | static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm) |
a5079d08 | 379 | { |
104880a6 | 380 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm); |
a5079d08 SK |
381 | |
382 | crypto_free_ahash(ctx->auth); | |
383 | crypto_free_ablkcipher(ctx->enc); | |
104880a6 HX |
384 | crypto_put_default_null_skcipher(); |
385 | } | |
386 | ||
387 | static void crypto_authenc_esn_free(struct aead_instance *inst) | |
388 | { | |
389 | struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst); | |
390 | ||
391 | crypto_drop_skcipher(&ctx->enc); | |
392 | crypto_drop_ahash(&ctx->auth); | |
393 | kfree(inst); | |
a5079d08 SK |
394 | } |
395 | ||
104880a6 HX |
396 | static int crypto_authenc_esn_create(struct crypto_template *tmpl, |
397 | struct rtattr **tb) | |
a5079d08 SK |
398 | { |
399 | struct crypto_attr_type *algt; | |
104880a6 | 400 | struct aead_instance *inst; |
a5079d08 SK |
401 | struct hash_alg_common *auth; |
402 | struct crypto_alg *auth_base; | |
403 | struct crypto_alg *enc; | |
404 | struct authenc_esn_instance_ctx *ctx; | |
405 | const char *enc_name; | |
406 | int err; | |
407 | ||
408 | algt = crypto_get_attr_type(tb); | |
a5079d08 | 409 | if (IS_ERR(algt)) |
104880a6 | 410 | return PTR_ERR(algt); |
a5079d08 | 411 | |
5e4b8c1f | 412 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
104880a6 | 413 | return -EINVAL; |
a5079d08 SK |
414 | |
415 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, | |
416 | CRYPTO_ALG_TYPE_AHASH_MASK); | |
417 | if (IS_ERR(auth)) | |
104880a6 | 418 | return PTR_ERR(auth); |
a5079d08 SK |
419 | |
420 | auth_base = &auth->base; | |
421 | ||
422 | enc_name = crypto_attr_alg_name(tb[2]); | |
423 | err = PTR_ERR(enc_name); | |
424 | if (IS_ERR(enc_name)) | |
425 | goto out_put_auth; | |
426 | ||
427 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); | |
428 | err = -ENOMEM; | |
429 | if (!inst) | |
430 | goto out_put_auth; | |
431 | ||
104880a6 | 432 | ctx = aead_instance_ctx(inst); |
a5079d08 | 433 | |
104880a6 HX |
434 | err = crypto_init_ahash_spawn(&ctx->auth, auth, |
435 | aead_crypto_instance(inst)); | |
a5079d08 SK |
436 | if (err) |
437 | goto err_free_inst; | |
438 | ||
104880a6 | 439 | crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst)); |
a5079d08 SK |
440 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, |
441 | crypto_requires_sync(algt->type, | |
442 | algt->mask)); | |
443 | if (err) | |
444 | goto err_drop_auth; | |
445 | ||
446 | enc = crypto_skcipher_spawn_alg(&ctx->enc); | |
447 | ||
448 | err = -ENAMETOOLONG; | |
104880a6 HX |
449 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
450 | "authencesn(%s,%s)", auth_base->cra_name, | |
451 | enc->cra_name) >= CRYPTO_MAX_ALG_NAME) | |
a5079d08 SK |
452 | goto err_drop_enc; |
453 | ||
104880a6 | 454 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
a5079d08 SK |
455 | "authencesn(%s,%s)", auth_base->cra_driver_name, |
456 | enc->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) | |
457 | goto err_drop_enc; | |
458 | ||
104880a6 | 459 | inst->alg.base.cra_flags = enc->cra_flags & CRYPTO_ALG_ASYNC; |
104880a6 HX |
460 | inst->alg.base.cra_priority = enc->cra_priority * 10 + |
461 | auth_base->cra_priority; | |
462 | inst->alg.base.cra_blocksize = enc->cra_blocksize; | |
463 | inst->alg.base.cra_alignmask = auth_base->cra_alignmask | | |
464 | enc->cra_alignmask; | |
465 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx); | |
466 | ||
467 | inst->alg.ivsize = enc->cra_ablkcipher.ivsize; | |
468 | inst->alg.maxauthsize = auth->digestsize; | |
a5079d08 | 469 | |
104880a6 HX |
470 | inst->alg.init = crypto_authenc_esn_init_tfm; |
471 | inst->alg.exit = crypto_authenc_esn_exit_tfm; | |
a5079d08 | 472 | |
104880a6 HX |
473 | inst->alg.setkey = crypto_authenc_esn_setkey; |
474 | inst->alg.setauthsize = crypto_authenc_esn_setauthsize; | |
475 | inst->alg.encrypt = crypto_authenc_esn_encrypt; | |
476 | inst->alg.decrypt = crypto_authenc_esn_decrypt; | |
a5079d08 | 477 | |
104880a6 | 478 | inst->free = crypto_authenc_esn_free, |
a5079d08 | 479 | |
104880a6 HX |
480 | err = aead_register_instance(tmpl, inst); |
481 | if (err) | |
482 | goto err_drop_enc; | |
a5079d08 SK |
483 | |
484 | out: | |
485 | crypto_mod_put(auth_base); | |
104880a6 | 486 | return err; |
a5079d08 SK |
487 | |
488 | err_drop_enc: | |
489 | crypto_drop_skcipher(&ctx->enc); | |
490 | err_drop_auth: | |
491 | crypto_drop_ahash(&ctx->auth); | |
492 | err_free_inst: | |
493 | kfree(inst); | |
494 | out_put_auth: | |
a5079d08 SK |
495 | goto out; |
496 | } | |
497 | ||
a5079d08 SK |
498 | static struct crypto_template crypto_authenc_esn_tmpl = { |
499 | .name = "authencesn", | |
104880a6 | 500 | .create = crypto_authenc_esn_create, |
a5079d08 SK |
501 | .module = THIS_MODULE, |
502 | }; | |
503 | ||
504 | static int __init crypto_authenc_esn_module_init(void) | |
505 | { | |
506 | return crypto_register_template(&crypto_authenc_esn_tmpl); | |
507 | } | |
508 | ||
509 | static void __exit crypto_authenc_esn_module_exit(void) | |
510 | { | |
511 | crypto_unregister_template(&crypto_authenc_esn_tmpl); | |
512 | } | |
513 | ||
514 | module_init(crypto_authenc_esn_module_init); | |
515 | module_exit(crypto_authenc_esn_module_exit); | |
516 | ||
517 | MODULE_LICENSE("GPL"); | |
518 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
519 | MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers"); | |
4943ba16 | 520 | MODULE_ALIAS_CRYPTO("authencesn"); |