Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
a5079d08 SK |
2 | /* |
3 | * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers, | |
4 | * derived from authenc.c | |
5 | * | |
6 | * Copyright (C) 2010 secunet Security Networks AG | |
7 | * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com> | |
104880a6 | 8 | * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au> |
a5079d08 SK |
9 | */ |
10 | ||
7fb2a4bd | 11 | #include <crypto/internal/aead.h> |
a5079d08 SK |
12 | #include <crypto/internal/hash.h> |
13 | #include <crypto/internal/skcipher.h> | |
14 | #include <crypto/authenc.h> | |
104880a6 | 15 | #include <crypto/null.h> |
a5079d08 SK |
16 | #include <crypto/scatterwalk.h> |
17 | #include <linux/err.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/rtnetlink.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/spinlock.h> | |
24 | ||
25 | struct authenc_esn_instance_ctx { | |
26 | struct crypto_ahash_spawn auth; | |
27 | struct crypto_skcipher_spawn enc; | |
28 | }; | |
29 | ||
30 | struct crypto_authenc_esn_ctx { | |
31 | unsigned int reqoff; | |
32 | struct crypto_ahash *auth; | |
e75445a8 | 33 | struct crypto_skcipher *enc; |
8d605398 | 34 | struct crypto_sync_skcipher *null; |
a5079d08 SK |
35 | }; |
36 | ||
37 | struct authenc_esn_request_ctx { | |
104880a6 HX |
38 | struct scatterlist src[2]; |
39 | struct scatterlist dst[2]; | |
a5079d08 SK |
40 | char tail[]; |
41 | }; | |
42 | ||
43 | static void authenc_esn_request_complete(struct aead_request *req, int err) | |
44 | { | |
45 | if (err != -EINPROGRESS) | |
46 | aead_request_complete(req, err); | |
47 | } | |
48 | ||
104880a6 HX |
49 | static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn, |
50 | unsigned int authsize) | |
51 | { | |
52 | if (authsize > 0 && authsize < 4) | |
53 | return -EINVAL; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
a5079d08 SK |
58 | static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key, |
59 | unsigned int keylen) | |
60 | { | |
a5079d08 SK |
61 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
62 | struct crypto_ahash *auth = ctx->auth; | |
e75445a8 | 63 | struct crypto_skcipher *enc = ctx->enc; |
fddc2c43 | 64 | struct crypto_authenc_keys keys; |
a5079d08 SK |
65 | int err = -EINVAL; |
66 | ||
fddc2c43 | 67 | if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) |
a5079d08 | 68 | goto badkey; |
a5079d08 SK |
69 | |
70 | crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK); | |
71 | crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) & | |
72 | CRYPTO_TFM_REQ_MASK); | |
fddc2c43 | 73 | err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen); |
a5079d08 SK |
74 | crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) & |
75 | CRYPTO_TFM_RES_MASK); | |
76 | ||
77 | if (err) | |
78 | goto out; | |
79 | ||
e75445a8 HX |
80 | crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK); |
81 | crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) & | |
a5079d08 | 82 | CRYPTO_TFM_REQ_MASK); |
e75445a8 HX |
83 | err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen); |
84 | crypto_aead_set_flags(authenc_esn, crypto_skcipher_get_flags(enc) & | |
a5079d08 SK |
85 | CRYPTO_TFM_RES_MASK); |
86 | ||
87 | out: | |
31545df3 | 88 | memzero_explicit(&keys, sizeof(keys)); |
a5079d08 SK |
89 | return err; |
90 | ||
91 | badkey: | |
92 | crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN); | |
93 | goto out; | |
94 | } | |
95 | ||
104880a6 HX |
96 | static int crypto_authenc_esn_genicv_tail(struct aead_request *req, |
97 | unsigned int flags) | |
a5079d08 | 98 | { |
a5079d08 SK |
99 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
100 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
101 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
104880a6 HX |
102 | struct crypto_ahash *auth = ctx->auth; |
103 | u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
104 | crypto_ahash_alignmask(auth) + 1); | |
105 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
106 | unsigned int assoclen = req->assoclen; | |
107 | unsigned int cryptlen = req->cryptlen; | |
108 | struct scatterlist *dst = req->dst; | |
109 | u32 tmp[2]; | |
a5079d08 | 110 | |
104880a6 HX |
111 | /* Move high-order bits of sequence number back. */ |
112 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 0); | |
113 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0); | |
114 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 1); | |
a5079d08 | 115 | |
104880a6 HX |
116 | scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1); |
117 | return 0; | |
a5079d08 SK |
118 | } |
119 | ||
a5079d08 SK |
120 | static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq, |
121 | int err) | |
122 | { | |
123 | struct aead_request *req = areq->data; | |
a5079d08 | 124 | |
104880a6 | 125 | err = err ?: crypto_authenc_esn_genicv_tail(req, 0); |
a5079d08 SK |
126 | aead_request_complete(req, err); |
127 | } | |
128 | ||
104880a6 HX |
129 | static int crypto_authenc_esn_genicv(struct aead_request *req, |
130 | unsigned int flags) | |
a5079d08 | 131 | { |
a5079d08 | 132 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
a5079d08 | 133 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); |
a5079d08 | 134 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
104880a6 HX |
135 | struct crypto_ahash *auth = ctx->auth; |
136 | u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
137 | crypto_ahash_alignmask(auth) + 1); | |
a5079d08 | 138 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); |
104880a6 HX |
139 | unsigned int authsize = crypto_aead_authsize(authenc_esn); |
140 | unsigned int assoclen = req->assoclen; | |
a5079d08 | 141 | unsigned int cryptlen = req->cryptlen; |
104880a6 HX |
142 | struct scatterlist *dst = req->dst; |
143 | u32 tmp[2]; | |
a5079d08 | 144 | |
104880a6 HX |
145 | if (!authsize) |
146 | return 0; | |
a5079d08 | 147 | |
104880a6 HX |
148 | /* Move high-order bits of sequence number to the end. */ |
149 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 0); | |
150 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 1); | |
151 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1); | |
a5079d08 | 152 | |
104880a6 HX |
153 | sg_init_table(areq_ctx->dst, 2); |
154 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4); | |
a5079d08 | 155 | |
104880a6 HX |
156 | ahash_request_set_tfm(ahreq, auth); |
157 | ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen); | |
158 | ahash_request_set_callback(ahreq, flags, | |
159 | authenc_esn_geniv_ahash_done, req); | |
a5079d08 | 160 | |
104880a6 HX |
161 | return crypto_ahash_digest(ahreq) ?: |
162 | crypto_authenc_esn_genicv_tail(req, aead_request_flags(req)); | |
a5079d08 SK |
163 | } |
164 | ||
165 | ||
104880a6 HX |
166 | static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req, |
167 | int err) | |
a5079d08 | 168 | { |
104880a6 | 169 | struct aead_request *areq = req->data; |
a5079d08 | 170 | |
104880a6 HX |
171 | if (!err) |
172 | err = crypto_authenc_esn_genicv(areq, 0); | |
a5079d08 | 173 | |
104880a6 | 174 | authenc_esn_request_complete(areq, err); |
a5079d08 SK |
175 | } |
176 | ||
104880a6 | 177 | static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len) |
a5079d08 SK |
178 | { |
179 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
180 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
8d605398 | 181 | SYNC_SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null); |
a5079d08 | 182 | |
8d605398 | 183 | skcipher_request_set_sync_tfm(skreq, ctx->null); |
e75445a8 HX |
184 | skcipher_request_set_callback(skreq, aead_request_flags(req), |
185 | NULL, NULL); | |
186 | skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL); | |
187 | ||
188 | return crypto_skcipher_encrypt(skreq); | |
a5079d08 SK |
189 | } |
190 | ||
104880a6 | 191 | static int crypto_authenc_esn_encrypt(struct aead_request *req) |
a5079d08 SK |
192 | { |
193 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
194 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
104880a6 | 195 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
e75445a8 HX |
196 | struct skcipher_request *skreq = (void *)(areq_ctx->tail + |
197 | ctx->reqoff); | |
198 | struct crypto_skcipher *enc = ctx->enc; | |
104880a6 | 199 | unsigned int assoclen = req->assoclen; |
a5079d08 | 200 | unsigned int cryptlen = req->cryptlen; |
104880a6 HX |
201 | struct scatterlist *src, *dst; |
202 | int err; | |
a5079d08 | 203 | |
104880a6 HX |
204 | sg_init_table(areq_ctx->src, 2); |
205 | src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen); | |
206 | dst = src; | |
a5079d08 | 207 | |
104880a6 HX |
208 | if (req->src != req->dst) { |
209 | err = crypto_authenc_esn_copy(req, assoclen); | |
210 | if (err) | |
211 | return err; | |
a5079d08 | 212 | |
104880a6 HX |
213 | sg_init_table(areq_ctx->dst, 2); |
214 | dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen); | |
a5079d08 SK |
215 | } |
216 | ||
e75445a8 HX |
217 | skcipher_request_set_tfm(skreq, enc); |
218 | skcipher_request_set_callback(skreq, aead_request_flags(req), | |
219 | crypto_authenc_esn_encrypt_done, req); | |
220 | skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv); | |
a5079d08 | 221 | |
e75445a8 | 222 | err = crypto_skcipher_encrypt(skreq); |
a5079d08 SK |
223 | if (err) |
224 | return err; | |
225 | ||
104880a6 | 226 | return crypto_authenc_esn_genicv(req, aead_request_flags(req)); |
a5079d08 SK |
227 | } |
228 | ||
104880a6 HX |
229 | static int crypto_authenc_esn_decrypt_tail(struct aead_request *req, |
230 | unsigned int flags) | |
a5079d08 | 231 | { |
104880a6 HX |
232 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); |
233 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
234 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
235 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); | |
e75445a8 HX |
236 | struct skcipher_request *skreq = (void *)(areq_ctx->tail + |
237 | ctx->reqoff); | |
104880a6 HX |
238 | struct crypto_ahash *auth = ctx->auth; |
239 | u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
240 | crypto_ahash_alignmask(auth) + 1); | |
241 | unsigned int cryptlen = req->cryptlen - authsize; | |
242 | unsigned int assoclen = req->assoclen; | |
243 | struct scatterlist *dst = req->dst; | |
244 | u8 *ihash = ohash + crypto_ahash_digestsize(auth); | |
245 | u32 tmp[2]; | |
a5079d08 | 246 | |
41cdf7a4 HX |
247 | if (!authsize) |
248 | goto decrypt; | |
249 | ||
104880a6 HX |
250 | /* Move high-order bits of sequence number back. */ |
251 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 0); | |
252 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0); | |
253 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 1); | |
a5079d08 | 254 | |
104880a6 HX |
255 | if (crypto_memneq(ihash, ohash, authsize)) |
256 | return -EBADMSG; | |
a5079d08 | 257 | |
41cdf7a4 HX |
258 | decrypt: |
259 | ||
104880a6 HX |
260 | sg_init_table(areq_ctx->dst, 2); |
261 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen); | |
a5079d08 | 262 | |
e75445a8 HX |
263 | skcipher_request_set_tfm(skreq, ctx->enc); |
264 | skcipher_request_set_callback(skreq, flags, | |
265 | req->base.complete, req->base.data); | |
266 | skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv); | |
a5079d08 | 267 | |
e75445a8 | 268 | return crypto_skcipher_decrypt(skreq); |
a5079d08 SK |
269 | } |
270 | ||
104880a6 HX |
271 | static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq, |
272 | int err) | |
a5079d08 | 273 | { |
104880a6 | 274 | struct aead_request *req = areq->data; |
a5079d08 | 275 | |
104880a6 | 276 | err = err ?: crypto_authenc_esn_decrypt_tail(req, 0); |
a7773363 | 277 | authenc_esn_request_complete(req, err); |
a5079d08 SK |
278 | } |
279 | ||
104880a6 | 280 | static int crypto_authenc_esn_decrypt(struct aead_request *req) |
a5079d08 SK |
281 | { |
282 | struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req); | |
283 | struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req); | |
104880a6 HX |
284 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn); |
285 | struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff); | |
286 | unsigned int authsize = crypto_aead_authsize(authenc_esn); | |
287 | struct crypto_ahash *auth = ctx->auth; | |
288 | u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail, | |
289 | crypto_ahash_alignmask(auth) + 1); | |
290 | unsigned int assoclen = req->assoclen; | |
291 | unsigned int cryptlen = req->cryptlen; | |
292 | u8 *ihash = ohash + crypto_ahash_digestsize(auth); | |
293 | struct scatterlist *dst = req->dst; | |
294 | u32 tmp[2]; | |
295 | int err; | |
a5079d08 | 296 | |
104880a6 | 297 | cryptlen -= authsize; |
a5079d08 | 298 | |
104880a6 HX |
299 | if (req->src != dst) { |
300 | err = crypto_authenc_esn_copy(req, assoclen + cryptlen); | |
301 | if (err) | |
302 | return err; | |
303 | } | |
a5079d08 | 304 | |
104880a6 HX |
305 | scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen, |
306 | authsize, 0); | |
a5079d08 | 307 | |
104880a6 HX |
308 | if (!authsize) |
309 | goto tail; | |
a5079d08 | 310 | |
104880a6 HX |
311 | /* Move high-order bits of sequence number to the end. */ |
312 | scatterwalk_map_and_copy(tmp, dst, 0, 8, 0); | |
313 | scatterwalk_map_and_copy(tmp, dst, 4, 4, 1); | |
314 | scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1); | |
a5079d08 | 315 | |
104880a6 HX |
316 | sg_init_table(areq_ctx->dst, 2); |
317 | dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4); | |
a5079d08 | 318 | |
104880a6 HX |
319 | ahash_request_set_tfm(ahreq, auth); |
320 | ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen); | |
321 | ahash_request_set_callback(ahreq, aead_request_flags(req), | |
322 | authenc_esn_verify_ahash_done, req); | |
a5079d08 | 323 | |
104880a6 | 324 | err = crypto_ahash_digest(ahreq); |
a5079d08 SK |
325 | if (err) |
326 | return err; | |
327 | ||
104880a6 HX |
328 | tail: |
329 | return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req)); | |
a5079d08 SK |
330 | } |
331 | ||
104880a6 | 332 | static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm) |
a5079d08 | 333 | { |
104880a6 HX |
334 | struct aead_instance *inst = aead_alg_instance(tfm); |
335 | struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst); | |
336 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm); | |
a5079d08 | 337 | struct crypto_ahash *auth; |
e75445a8 | 338 | struct crypto_skcipher *enc; |
8d605398 | 339 | struct crypto_sync_skcipher *null; |
a5079d08 SK |
340 | int err; |
341 | ||
342 | auth = crypto_spawn_ahash(&ictx->auth); | |
343 | if (IS_ERR(auth)) | |
344 | return PTR_ERR(auth); | |
345 | ||
60425a8b | 346 | enc = crypto_spawn_skcipher(&ictx->enc); |
a5079d08 SK |
347 | err = PTR_ERR(enc); |
348 | if (IS_ERR(enc)) | |
349 | goto err_free_ahash; | |
350 | ||
3a2d4fb5 | 351 | null = crypto_get_default_null_skcipher(); |
104880a6 HX |
352 | err = PTR_ERR(null); |
353 | if (IS_ERR(null)) | |
354 | goto err_free_skcipher; | |
355 | ||
a5079d08 SK |
356 | ctx->auth = auth; |
357 | ctx->enc = enc; | |
104880a6 | 358 | ctx->null = null; |
a5079d08 | 359 | |
104880a6 HX |
360 | ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth), |
361 | crypto_ahash_alignmask(auth) + 1); | |
a5079d08 | 362 | |
104880a6 HX |
363 | crypto_aead_set_reqsize( |
364 | tfm, | |
6650d09b HX |
365 | sizeof(struct authenc_esn_request_ctx) + |
366 | ctx->reqoff + | |
367 | max_t(unsigned int, | |
e75445a8 HX |
368 | crypto_ahash_reqsize(auth) + |
369 | sizeof(struct ahash_request), | |
370 | sizeof(struct skcipher_request) + | |
371 | crypto_skcipher_reqsize(enc))); | |
a5079d08 SK |
372 | |
373 | return 0; | |
374 | ||
104880a6 | 375 | err_free_skcipher: |
e75445a8 | 376 | crypto_free_skcipher(enc); |
a5079d08 SK |
377 | err_free_ahash: |
378 | crypto_free_ahash(auth); | |
379 | return err; | |
380 | } | |
381 | ||
104880a6 | 382 | static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm) |
a5079d08 | 383 | { |
104880a6 | 384 | struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm); |
a5079d08 SK |
385 | |
386 | crypto_free_ahash(ctx->auth); | |
e75445a8 | 387 | crypto_free_skcipher(ctx->enc); |
3a2d4fb5 | 388 | crypto_put_default_null_skcipher(); |
104880a6 HX |
389 | } |
390 | ||
391 | static void crypto_authenc_esn_free(struct aead_instance *inst) | |
392 | { | |
393 | struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst); | |
394 | ||
395 | crypto_drop_skcipher(&ctx->enc); | |
396 | crypto_drop_ahash(&ctx->auth); | |
397 | kfree(inst); | |
a5079d08 SK |
398 | } |
399 | ||
104880a6 HX |
400 | static int crypto_authenc_esn_create(struct crypto_template *tmpl, |
401 | struct rtattr **tb) | |
a5079d08 SK |
402 | { |
403 | struct crypto_attr_type *algt; | |
104880a6 | 404 | struct aead_instance *inst; |
a5079d08 SK |
405 | struct hash_alg_common *auth; |
406 | struct crypto_alg *auth_base; | |
e75445a8 | 407 | struct skcipher_alg *enc; |
a5079d08 SK |
408 | struct authenc_esn_instance_ctx *ctx; |
409 | const char *enc_name; | |
410 | int err; | |
411 | ||
412 | algt = crypto_get_attr_type(tb); | |
a5079d08 | 413 | if (IS_ERR(algt)) |
104880a6 | 414 | return PTR_ERR(algt); |
a5079d08 | 415 | |
5e4b8c1f | 416 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
104880a6 | 417 | return -EINVAL; |
a5079d08 SK |
418 | |
419 | auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH, | |
927ef32d HX |
420 | CRYPTO_ALG_TYPE_AHASH_MASK | |
421 | crypto_requires_sync(algt->type, algt->mask)); | |
a5079d08 | 422 | if (IS_ERR(auth)) |
104880a6 | 423 | return PTR_ERR(auth); |
a5079d08 SK |
424 | |
425 | auth_base = &auth->base; | |
426 | ||
427 | enc_name = crypto_attr_alg_name(tb[2]); | |
428 | err = PTR_ERR(enc_name); | |
429 | if (IS_ERR(enc_name)) | |
430 | goto out_put_auth; | |
431 | ||
432 | inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); | |
433 | err = -ENOMEM; | |
434 | if (!inst) | |
435 | goto out_put_auth; | |
436 | ||
104880a6 | 437 | ctx = aead_instance_ctx(inst); |
a5079d08 | 438 | |
104880a6 HX |
439 | err = crypto_init_ahash_spawn(&ctx->auth, auth, |
440 | aead_crypto_instance(inst)); | |
a5079d08 SK |
441 | if (err) |
442 | goto err_free_inst; | |
443 | ||
104880a6 | 444 | crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst)); |
a35528ec EB |
445 | err = crypto_grab_skcipher(&ctx->enc, enc_name, 0, |
446 | crypto_requires_sync(algt->type, | |
447 | algt->mask)); | |
a5079d08 SK |
448 | if (err) |
449 | goto err_drop_auth; | |
450 | ||
e75445a8 | 451 | enc = crypto_spawn_skcipher_alg(&ctx->enc); |
a5079d08 SK |
452 | |
453 | err = -ENAMETOOLONG; | |
104880a6 HX |
454 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
455 | "authencesn(%s,%s)", auth_base->cra_name, | |
e75445a8 | 456 | enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME) |
a5079d08 SK |
457 | goto err_drop_enc; |
458 | ||
104880a6 | 459 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
a5079d08 | 460 | "authencesn(%s,%s)", auth_base->cra_driver_name, |
e75445a8 | 461 | enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) |
a5079d08 SK |
462 | goto err_drop_enc; |
463 | ||
e75445a8 HX |
464 | inst->alg.base.cra_flags = (auth_base->cra_flags | |
465 | enc->base.cra_flags) & CRYPTO_ALG_ASYNC; | |
466 | inst->alg.base.cra_priority = enc->base.cra_priority * 10 + | |
104880a6 | 467 | auth_base->cra_priority; |
e75445a8 | 468 | inst->alg.base.cra_blocksize = enc->base.cra_blocksize; |
104880a6 | 469 | inst->alg.base.cra_alignmask = auth_base->cra_alignmask | |
e75445a8 | 470 | enc->base.cra_alignmask; |
104880a6 HX |
471 | inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx); |
472 | ||
e75445a8 HX |
473 | inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc); |
474 | inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc); | |
104880a6 | 475 | inst->alg.maxauthsize = auth->digestsize; |
a5079d08 | 476 | |
104880a6 HX |
477 | inst->alg.init = crypto_authenc_esn_init_tfm; |
478 | inst->alg.exit = crypto_authenc_esn_exit_tfm; | |
a5079d08 | 479 | |
104880a6 HX |
480 | inst->alg.setkey = crypto_authenc_esn_setkey; |
481 | inst->alg.setauthsize = crypto_authenc_esn_setauthsize; | |
482 | inst->alg.encrypt = crypto_authenc_esn_encrypt; | |
483 | inst->alg.decrypt = crypto_authenc_esn_decrypt; | |
a5079d08 | 484 | |
104880a6 | 485 | inst->free = crypto_authenc_esn_free, |
a5079d08 | 486 | |
104880a6 HX |
487 | err = aead_register_instance(tmpl, inst); |
488 | if (err) | |
489 | goto err_drop_enc; | |
a5079d08 SK |
490 | |
491 | out: | |
492 | crypto_mod_put(auth_base); | |
104880a6 | 493 | return err; |
a5079d08 SK |
494 | |
495 | err_drop_enc: | |
496 | crypto_drop_skcipher(&ctx->enc); | |
497 | err_drop_auth: | |
498 | crypto_drop_ahash(&ctx->auth); | |
499 | err_free_inst: | |
500 | kfree(inst); | |
501 | out_put_auth: | |
a5079d08 SK |
502 | goto out; |
503 | } | |
504 | ||
a5079d08 SK |
505 | static struct crypto_template crypto_authenc_esn_tmpl = { |
506 | .name = "authencesn", | |
104880a6 | 507 | .create = crypto_authenc_esn_create, |
a5079d08 SK |
508 | .module = THIS_MODULE, |
509 | }; | |
510 | ||
511 | static int __init crypto_authenc_esn_module_init(void) | |
512 | { | |
513 | return crypto_register_template(&crypto_authenc_esn_tmpl); | |
514 | } | |
515 | ||
516 | static void __exit crypto_authenc_esn_module_exit(void) | |
517 | { | |
518 | crypto_unregister_template(&crypto_authenc_esn_tmpl); | |
519 | } | |
520 | ||
c4741b23 | 521 | subsys_initcall(crypto_authenc_esn_module_init); |
a5079d08 SK |
522 | module_exit(crypto_authenc_esn_module_exit); |
523 | ||
524 | MODULE_LICENSE("GPL"); | |
525 | MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>"); | |
526 | MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers"); | |
4943ba16 | 527 | MODULE_ALIAS_CRYPTO("authencesn"); |