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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
3c09f17c HX |
2 | /* |
3 | * Authenc: Simple AEAD wrapper for IPsec | |
4 | * | |
92d95ba9 | 5 | * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> |
3c09f17c HX |
6 | */ |
7 | ||
68acbf84 | 8 | #include <crypto/internal/aead.h> |
5f7082ed | 9 | #include <crypto/internal/hash.h> |
9ffde35a | 10 | #include <crypto/internal/skcipher.h> |
e236d4a8 | 11 | #include <crypto/authenc.h> |
92d95ba9 | 12 | #include <crypto/null.h> |
42c271c6 | 13 | #include <crypto/scatterwalk.h> |
3c09f17c HX |
14 | #include <linux/err.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
e236d4a8 | 18 | #include <linux/rtnetlink.h> |
3c09f17c HX |
19 | #include <linux/slab.h> |
20 | #include <linux/spinlock.h> | |
21 | ||
3c09f17c | 22 | struct authenc_instance_ctx { |
cbdcf80d | 23 | struct crypto_ahash_spawn auth; |
9ffde35a | 24 | struct crypto_skcipher_spawn enc; |
92d95ba9 | 25 | unsigned int reqoff; |
3c09f17c HX |
26 | }; |
27 | ||
28 | struct crypto_authenc_ctx { | |
cbdcf80d | 29 | struct crypto_ahash *auth; |
7217d49f | 30 | struct crypto_skcipher *enc; |
8d605398 | 31 | struct crypto_sync_skcipher *null; |
3c09f17c HX |
32 | }; |
33 | ||
cbdcf80d | 34 | struct authenc_request_ctx { |
92d95ba9 HX |
35 | struct scatterlist src[2]; |
36 | struct scatterlist dst[2]; | |
cbdcf80d SK |
37 | char tail[]; |
38 | }; | |
39 | ||
180ce7e8 HX |
40 | static void authenc_request_complete(struct aead_request *req, int err) |
41 | { | |
42 | if (err != -EINPROGRESS) | |
43 | aead_request_complete(req, err); | |
44 | } | |
45 | ||
bc6e2bdb MK |
46 | int crypto_authenc_extractkeys(struct crypto_authenc_keys *keys, const u8 *key, |
47 | unsigned int keylen) | |
3c09f17c | 48 | { |
bc6e2bdb | 49 | struct rtattr *rta = (struct rtattr *)key; |
e236d4a8 | 50 | struct crypto_authenc_key_param *param; |
3c09f17c | 51 | |
12dc5e62 | 52 | if (!RTA_OK(rta, keylen)) |
bc6e2bdb | 53 | return -EINVAL; |
e236d4a8 | 54 | if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM) |
bc6e2bdb | 55 | return -EINVAL; |
8f9c4693 EB |
56 | |
57 | /* | |
58 | * RTA_OK() didn't align the rtattr's payload when validating that it | |
59 | * fits in the buffer. Yet, the keys should start on the next 4-byte | |
60 | * aligned boundary. To avoid confusion, require that the rtattr | |
61 | * payload be exactly the param struct, which has a 4-byte aligned size. | |
62 | */ | |
63 | if (RTA_PAYLOAD(rta) != sizeof(*param)) | |
bc6e2bdb | 64 | return -EINVAL; |
8f9c4693 | 65 | BUILD_BUG_ON(sizeof(*param) % RTA_ALIGNTO); |
e236d4a8 HX |
66 | |
67 | param = RTA_DATA(rta); | |
bc6e2bdb | 68 | keys->enckeylen = be32_to_cpu(param->enckeylen); |
e236d4a8 | 69 | |
8f9c4693 EB |
70 | key += rta->rta_len; |
71 | keylen -= rta->rta_len; | |
e236d4a8 | 72 | |
bc6e2bdb MK |
73 | if (keylen < keys->enckeylen) |
74 | return -EINVAL; | |
75 | ||
76 | keys->authkeylen = keylen - keys->enckeylen; | |
77 | keys->authkey = key; | |
78 | keys->enckey = key + keys->authkeylen; | |
e236d4a8 | 79 | |
bc6e2bdb MK |
80 | return 0; |
81 | } | |
82 | EXPORT_SYMBOL_GPL(crypto_authenc_extractkeys); | |
83 | ||
84 | static int crypto_authenc_setkey(struct crypto_aead *authenc, const u8 *key, | |
85 | unsigned int keylen) | |
86 | { | |
87 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
88 | struct crypto_ahash *auth = ctx->auth; | |
7217d49f | 89 | struct crypto_skcipher *enc = ctx->enc; |
bc6e2bdb MK |
90 | struct crypto_authenc_keys keys; |
91 | int err = -EINVAL; | |
92 | ||
93 | if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) | |
94 | goto badkey; | |
3c09f17c | 95 | |
cbdcf80d SK |
96 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); |
97 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc) & | |
3c09f17c | 98 | CRYPTO_TFM_REQ_MASK); |
bc6e2bdb | 99 | err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
cbdcf80d | 100 | crypto_aead_set_flags(authenc, crypto_ahash_get_flags(auth) & |
3c09f17c HX |
101 | CRYPTO_TFM_RES_MASK); |
102 | ||
103 | if (err) | |
104 | goto out; | |
105 | ||
7217d49f HX |
106 | crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); |
107 | crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc) & | |
108 | CRYPTO_TFM_REQ_MASK); | |
109 | err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen); | |
110 | crypto_aead_set_flags(authenc, crypto_skcipher_get_flags(enc) & | |
3c09f17c HX |
111 | CRYPTO_TFM_RES_MASK); |
112 | ||
113 | out: | |
ad2fdcdf | 114 | memzero_explicit(&keys, sizeof(keys)); |
3c09f17c | 115 | return err; |
e236d4a8 HX |
116 | |
117 | badkey: | |
118 | crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
119 | goto out; | |
3c09f17c HX |
120 | } |
121 | ||
cbdcf80d SK |
122 | static void authenc_geniv_ahash_done(struct crypto_async_request *areq, int err) |
123 | { | |
124 | struct aead_request *req = areq->data; | |
125 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
92d95ba9 HX |
126 | struct aead_instance *inst = aead_alg_instance(authenc); |
127 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); | |
cbdcf80d | 128 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
92d95ba9 | 129 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
cbdcf80d SK |
130 | |
131 | if (err) | |
132 | goto out; | |
133 | ||
92d95ba9 HX |
134 | scatterwalk_map_and_copy(ahreq->result, req->dst, |
135 | req->assoclen + req->cryptlen, | |
cbdcf80d SK |
136 | crypto_aead_authsize(authenc), 1); |
137 | ||
138 | out: | |
139 | aead_request_complete(req, err); | |
140 | } | |
141 | ||
92d95ba9 | 142 | static int crypto_authenc_genicv(struct aead_request *req, unsigned int flags) |
cbdcf80d SK |
143 | { |
144 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
92d95ba9 | 145 | struct aead_instance *inst = aead_alg_instance(authenc); |
cbdcf80d | 146 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
92d95ba9 | 147 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
cbdcf80d SK |
148 | struct crypto_ahash *auth = ctx->auth; |
149 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
92d95ba9 | 150 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); |
cbdcf80d SK |
151 | u8 *hash = areq_ctx->tail; |
152 | int err; | |
3c09f17c | 153 | |
cbdcf80d SK |
154 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
155 | crypto_ahash_alignmask(auth) + 1); | |
156 | ||
157 | ahash_request_set_tfm(ahreq, auth); | |
92d95ba9 HX |
158 | ahash_request_set_crypt(ahreq, req->dst, hash, |
159 | req->assoclen + req->cryptlen); | |
160 | ahash_request_set_callback(ahreq, flags, | |
161 | authenc_geniv_ahash_done, req); | |
cbdcf80d SK |
162 | |
163 | err = crypto_ahash_digest(ahreq); | |
3c09f17c | 164 | if (err) |
92d95ba9 | 165 | return err; |
3c09f17c | 166 | |
92d95ba9 | 167 | scatterwalk_map_and_copy(hash, req->dst, req->assoclen + req->cryptlen, |
7ba683a6 | 168 | crypto_aead_authsize(authenc), 1); |
92d95ba9 | 169 | |
3c09f17c HX |
170 | return 0; |
171 | } | |
172 | ||
173 | static void crypto_authenc_encrypt_done(struct crypto_async_request *req, | |
174 | int err) | |
175 | { | |
a697690b HX |
176 | struct aead_request *areq = req->data; |
177 | ||
92d95ba9 HX |
178 | if (err) |
179 | goto out; | |
e56dd564 | 180 | |
92d95ba9 | 181 | err = crypto_authenc_genicv(areq, 0); |
3c09f17c | 182 | |
92d95ba9 | 183 | out: |
180ce7e8 | 184 | authenc_request_complete(areq, err); |
3c09f17c HX |
185 | } |
186 | ||
92d95ba9 HX |
187 | static int crypto_authenc_copy_assoc(struct aead_request *req) |
188 | { | |
189 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
190 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
8d605398 | 191 | SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null); |
92d95ba9 | 192 | |
8d605398 | 193 | skcipher_request_set_sync_tfm(skreq, ctx->null); |
7217d49f HX |
194 | skcipher_request_set_callback(skreq, aead_request_flags(req), |
195 | NULL, NULL); | |
196 | skcipher_request_set_crypt(skreq, req->src, req->dst, req->assoclen, | |
197 | NULL); | |
198 | ||
199 | return crypto_skcipher_encrypt(skreq); | |
92d95ba9 HX |
200 | } |
201 | ||
3c09f17c HX |
202 | static int crypto_authenc_encrypt(struct aead_request *req) |
203 | { | |
204 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
92d95ba9 | 205 | struct aead_instance *inst = aead_alg_instance(authenc); |
3c09f17c | 206 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); |
92d95ba9 | 207 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); |
50beceba | 208 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); |
7217d49f | 209 | struct crypto_skcipher *enc = ctx->enc; |
e56dd564 | 210 | unsigned int cryptlen = req->cryptlen; |
7217d49f HX |
211 | struct skcipher_request *skreq = (void *)(areq_ctx->tail + |
212 | ictx->reqoff); | |
92d95ba9 | 213 | struct scatterlist *src, *dst; |
3c09f17c HX |
214 | int err; |
215 | ||
92d95ba9 HX |
216 | src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen); |
217 | dst = src; | |
218 | ||
219 | if (req->src != req->dst) { | |
220 | err = crypto_authenc_copy_assoc(req); | |
221 | if (err) | |
222 | return err; | |
223 | ||
92d95ba9 HX |
224 | dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); |
225 | } | |
226 | ||
7217d49f HX |
227 | skcipher_request_set_tfm(skreq, enc); |
228 | skcipher_request_set_callback(skreq, aead_request_flags(req), | |
229 | crypto_authenc_encrypt_done, req); | |
230 | skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv); | |
3c09f17c | 231 | |
7217d49f | 232 | err = crypto_skcipher_encrypt(skreq); |
3c09f17c HX |
233 | if (err) |
234 | return err; | |
235 | ||
92d95ba9 | 236 | return crypto_authenc_genicv(req, aead_request_flags(req)); |
e56dd564 HX |
237 | } |
238 | ||
92d95ba9 HX |
239 | static int crypto_authenc_decrypt_tail(struct aead_request *req, |
240 | unsigned int flags) | |
e56dd564 | 241 | { |
92d95ba9 HX |
242 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); |
243 | struct aead_instance *inst = aead_alg_instance(authenc); | |
244 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
245 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); | |
246 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
247 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); | |
7217d49f HX |
248 | struct skcipher_request *skreq = (void *)(areq_ctx->tail + |
249 | ictx->reqoff); | |
92d95ba9 HX |
250 | unsigned int authsize = crypto_aead_authsize(authenc); |
251 | u8 *ihash = ahreq->result + authsize; | |
252 | struct scatterlist *src, *dst; | |
e56dd564 | 253 | |
92d95ba9 | 254 | scatterwalk_map_and_copy(ihash, req->src, ahreq->nbytes, authsize, 0); |
e56dd564 | 255 | |
92d95ba9 HX |
256 | if (crypto_memneq(ihash, ahreq->result, authsize)) |
257 | return -EBADMSG; | |
e56dd564 | 258 | |
92d95ba9 HX |
259 | src = scatterwalk_ffwd(areq_ctx->src, req->src, req->assoclen); |
260 | dst = src; | |
e56dd564 | 261 | |
c34252fd | 262 | if (req->src != req->dst) |
92d95ba9 | 263 | dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, req->assoclen); |
e56dd564 | 264 | |
7217d49f HX |
265 | skcipher_request_set_tfm(skreq, ctx->enc); |
266 | skcipher_request_set_callback(skreq, aead_request_flags(req), | |
267 | req->base.complete, req->base.data); | |
268 | skcipher_request_set_crypt(skreq, src, dst, | |
269 | req->cryptlen - authsize, req->iv); | |
3c09f17c | 270 | |
7217d49f | 271 | return crypto_skcipher_decrypt(skreq); |
3c09f17c HX |
272 | } |
273 | ||
92d95ba9 HX |
274 | static void authenc_verify_ahash_done(struct crypto_async_request *areq, |
275 | int err) | |
3c09f17c | 276 | { |
92d95ba9 | 277 | struct aead_request *req = areq->data; |
cbdcf80d | 278 | |
92d95ba9 HX |
279 | if (err) |
280 | goto out; | |
e56dd564 | 281 | |
92d95ba9 | 282 | err = crypto_authenc_decrypt_tail(req, 0); |
cbdcf80d | 283 | |
92d95ba9 HX |
284 | out: |
285 | authenc_request_complete(req, err); | |
3c09f17c HX |
286 | } |
287 | ||
288 | static int crypto_authenc_decrypt(struct aead_request *req) | |
289 | { | |
290 | struct crypto_aead *authenc = crypto_aead_reqtfm(req); | |
481f34ae | 291 | unsigned int authsize = crypto_aead_authsize(authenc); |
92d95ba9 HX |
292 | struct aead_instance *inst = aead_alg_instance(authenc); |
293 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(authenc); | |
294 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); | |
295 | struct crypto_ahash *auth = ctx->auth; | |
296 | struct authenc_request_ctx *areq_ctx = aead_request_ctx(req); | |
297 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ictx->reqoff); | |
298 | u8 *hash = areq_ctx->tail; | |
3c09f17c HX |
299 | int err; |
300 | ||
92d95ba9 HX |
301 | hash = (u8 *)ALIGN((unsigned long)hash + crypto_ahash_alignmask(auth), |
302 | crypto_ahash_alignmask(auth) + 1); | |
481f34ae | 303 | |
92d95ba9 HX |
304 | ahash_request_set_tfm(ahreq, auth); |
305 | ahash_request_set_crypt(ahreq, req->src, hash, | |
306 | req->assoclen + req->cryptlen - authsize); | |
307 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
308 | authenc_verify_ahash_done, req); | |
309 | ||
310 | err = crypto_ahash_digest(ahreq); | |
3c09f17c HX |
311 | if (err) |
312 | return err; | |
313 | ||
92d95ba9 | 314 | return crypto_authenc_decrypt_tail(req, aead_request_flags(req)); |
3c09f17c HX |
315 | } |
316 | ||
92d95ba9 | 317 | static int crypto_authenc_init_tfm(struct crypto_aead *tfm) |
3c09f17c | 318 | { |
92d95ba9 HX |
319 | struct aead_instance *inst = aead_alg_instance(tfm); |
320 | struct authenc_instance_ctx *ictx = aead_instance_ctx(inst); | |
321 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm); | |
cbdcf80d | 322 | struct crypto_ahash *auth; |
7217d49f | 323 | struct crypto_skcipher *enc; |
8d605398 | 324 | struct crypto_sync_skcipher *null; |
3c09f17c HX |
325 | int err; |
326 | ||
cbdcf80d | 327 | auth = crypto_spawn_ahash(&ictx->auth); |
3c09f17c HX |
328 | if (IS_ERR(auth)) |
329 | return PTR_ERR(auth); | |
330 | ||
60425a8b | 331 | enc = crypto_spawn_skcipher(&ictx->enc); |
3c09f17c HX |
332 | err = PTR_ERR(enc); |
333 | if (IS_ERR(enc)) | |
cbdcf80d | 334 | goto err_free_ahash; |
3c09f17c | 335 | |
3a2d4fb5 | 336 | null = crypto_get_default_null_skcipher(); |
92d95ba9 HX |
337 | err = PTR_ERR(null); |
338 | if (IS_ERR(null)) | |
339 | goto err_free_skcipher; | |
340 | ||
3c09f17c HX |
341 | ctx->auth = auth; |
342 | ctx->enc = enc; | |
92d95ba9 | 343 | ctx->null = null; |
f3542e6d | 344 | |
92d95ba9 HX |
345 | crypto_aead_set_reqsize( |
346 | tfm, | |
25df9194 | 347 | sizeof(struct authenc_request_ctx) + |
92d95ba9 | 348 | ictx->reqoff + |
25df9194 | 349 | max_t(unsigned int, |
92d95ba9 HX |
350 | crypto_ahash_reqsize(auth) + |
351 | sizeof(struct ahash_request), | |
7217d49f HX |
352 | sizeof(struct skcipher_request) + |
353 | crypto_skcipher_reqsize(enc))); | |
3c09f17c HX |
354 | |
355 | return 0; | |
356 | ||
92d95ba9 | 357 | err_free_skcipher: |
7217d49f | 358 | crypto_free_skcipher(enc); |
cbdcf80d SK |
359 | err_free_ahash: |
360 | crypto_free_ahash(auth); | |
3c09f17c HX |
361 | return err; |
362 | } | |
363 | ||
92d95ba9 | 364 | static void crypto_authenc_exit_tfm(struct crypto_aead *tfm) |
3c09f17c | 365 | { |
92d95ba9 | 366 | struct crypto_authenc_ctx *ctx = crypto_aead_ctx(tfm); |
3c09f17c | 367 | |
cbdcf80d | 368 | crypto_free_ahash(ctx->auth); |
7217d49f | 369 | crypto_free_skcipher(ctx->enc); |
3a2d4fb5 | 370 | crypto_put_default_null_skcipher(); |
3c09f17c HX |
371 | } |
372 | ||
92d95ba9 HX |
373 | static void crypto_authenc_free(struct aead_instance *inst) |
374 | { | |
375 | struct authenc_instance_ctx *ctx = aead_instance_ctx(inst); | |
376 | ||
377 | crypto_drop_skcipher(&ctx->enc); | |
378 | crypto_drop_ahash(&ctx->auth); | |
379 | kfree(inst); | |
380 | } | |
381 | ||
382 | static int crypto_authenc_create(struct crypto_template *tmpl, | |
383 | struct rtattr **tb) | |
3c09f17c | 384 | { |
9ffde35a | 385 | struct crypto_attr_type *algt; |
92d95ba9 | 386 | struct aead_instance *inst; |
cbdcf80d SK |
387 | struct hash_alg_common *auth; |
388 | struct crypto_alg *auth_base; | |
7217d49f | 389 | struct skcipher_alg *enc; |
3c09f17c | 390 | struct authenc_instance_ctx *ctx; |
9ffde35a | 391 | const char *enc_name; |
3c09f17c HX |
392 | int err; |
393 | ||
9ffde35a | 394 | algt = crypto_get_attr_type(tb); |
9ffde35a | 395 | if (IS_ERR(algt)) |
92d95ba9 | 396 | return PTR_ERR(algt); |
3c09f17c | 397 | |
5e4b8c1f | 398 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
92d95ba9 | 399 | return -EINVAL; |
9ffde35a | 400 | |
cbdcf80d | 401 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, |
927ef32d HX |
402 | CRYPTO_ALG_TYPE_AHASH_MASK | |
403 | crypto_requires_sync(algt->type, algt->mask)); | |
3c09f17c | 404 | if (IS_ERR(auth)) |
92d95ba9 | 405 | return PTR_ERR(auth); |
3c09f17c | 406 | |
cbdcf80d SK |
407 | auth_base = &auth->base; |
408 | ||
9ffde35a HX |
409 | enc_name = crypto_attr_alg_name(tb[2]); |
410 | err = PTR_ERR(enc_name); | |
411 | if (IS_ERR(enc_name)) | |
3c09f17c HX |
412 | goto out_put_auth; |
413 | ||
3c09f17c HX |
414 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); |
415 | err = -ENOMEM; | |
416 | if (!inst) | |
9ffde35a | 417 | goto out_put_auth; |
3c09f17c | 418 | |
92d95ba9 | 419 | ctx = aead_instance_ctx(inst); |
3c09f17c | 420 | |
92d95ba9 HX |
421 | err = crypto_init_ahash_spawn(&ctx->auth, auth, |
422 | aead_crypto_instance(inst)); | |
3c09f17c HX |
423 | if (err) |
424 | goto err_free_inst; | |
425 | ||
92d95ba9 | 426 | crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst)); |
a35528ec EB |
427 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, |
428 | crypto_requires_sync(algt->type, | |
429 | algt->mask)); | |
3c09f17c HX |
430 | if (err) |
431 | goto err_drop_auth; | |
432 | ||
7217d49f | 433 | enc = crypto_spawn_skcipher_alg(&ctx->enc); |
9ffde35a | 434 | |
92d95ba9 HX |
435 | ctx->reqoff = ALIGN(2 * auth->digestsize + auth_base->cra_alignmask, |
436 | auth_base->cra_alignmask + 1); | |
437 | ||
9ffde35a | 438 | err = -ENAMETOOLONG; |
92d95ba9 | 439 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
7217d49f HX |
440 | "authenc(%s,%s)", auth_base->cra_name, |
441 | enc->base.cra_name) >= | |
9ffde35a HX |
442 | CRYPTO_MAX_ALG_NAME) |
443 | goto err_drop_enc; | |
444 | ||
92d95ba9 | 445 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
cbdcf80d | 446 | "authenc(%s,%s)", auth_base->cra_driver_name, |
7217d49f | 447 | enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
9ffde35a HX |
448 | goto err_drop_enc; |
449 | ||
7217d49f HX |
450 | inst->alg.base.cra_flags = (auth_base->cra_flags | |
451 | enc->base.cra_flags) & CRYPTO_ALG_ASYNC; | |
452 | inst->alg.base.cra_priority = enc->base.cra_priority * 10 + | |
92d95ba9 | 453 | auth_base->cra_priority; |
7217d49f | 454 | inst->alg.base.cra_blocksize = enc->base.cra_blocksize; |
92d95ba9 | 455 | inst->alg.base.cra_alignmask = auth_base->cra_alignmask | |
7217d49f | 456 | enc->base.cra_alignmask; |
92d95ba9 HX |
457 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_ctx); |
458 | ||
7217d49f HX |
459 | inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc); |
460 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc); | |
92d95ba9 | 461 | inst->alg.maxauthsize = auth->digestsize; |
3c09f17c | 462 | |
92d95ba9 HX |
463 | inst->alg.init = crypto_authenc_init_tfm; |
464 | inst->alg.exit = crypto_authenc_exit_tfm; | |
3c09f17c | 465 | |
92d95ba9 HX |
466 | inst->alg.setkey = crypto_authenc_setkey; |
467 | inst->alg.encrypt = crypto_authenc_encrypt; | |
468 | inst->alg.decrypt = crypto_authenc_decrypt; | |
3c09f17c | 469 | |
92d95ba9 | 470 | inst->free = crypto_authenc_free; |
3c09f17c | 471 | |
92d95ba9 HX |
472 | err = aead_register_instance(tmpl, inst); |
473 | if (err) | |
474 | goto err_drop_enc; | |
3c09f17c HX |
475 | |
476 | out: | |
cbdcf80d | 477 | crypto_mod_put(auth_base); |
92d95ba9 | 478 | return err; |
3c09f17c | 479 | |
9ffde35a HX |
480 | err_drop_enc: |
481 | crypto_drop_skcipher(&ctx->enc); | |
3c09f17c | 482 | err_drop_auth: |
cbdcf80d | 483 | crypto_drop_ahash(&ctx->auth); |
3c09f17c HX |
484 | err_free_inst: |
485 | kfree(inst); | |
9ffde35a | 486 | out_put_auth: |
3c09f17c HX |
487 | goto out; |
488 | } | |
489 | ||
3c09f17c HX |
490 | static struct crypto_template crypto_authenc_tmpl = { |
491 | .name = "authenc", | |
92d95ba9 | 492 | .create = crypto_authenc_create, |
3c09f17c HX |
493 | .module = THIS_MODULE, |
494 | }; | |
495 | ||
496 | static int __init crypto_authenc_module_init(void) | |
497 | { | |
498 | return crypto_register_template(&crypto_authenc_tmpl); | |
499 | } | |
500 | ||
501 | static void __exit crypto_authenc_module_exit(void) | |
502 | { | |
503 | crypto_unregister_template(&crypto_authenc_tmpl); | |
504 | } | |
505 | ||
c4741b23 | 506 | subsys_initcall(crypto_authenc_module_init); |
3c09f17c HX |
507 | module_exit(crypto_authenc_module_exit); |
508 | ||
509 | MODULE_LICENSE("GPL"); | |
510 | MODULE_DESCRIPTION("Simple AEAD wrapper for IPsec"); | |
4943ba16 | 511 | MODULE_ALIAS_CRYPTO("authenc"); |