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