Commit | Line | Data |
---|---|---|
1ae97820 HX |
1 | /* |
2 | * AEAD: Authenticated Encryption with Associated Data | |
3922538f | 3 | * |
1ae97820 HX |
4 | * This file provides API support for AEAD algorithms. |
5 | * | |
6 | * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
3922538f | 10 | * Software Foundation; either version 2 of the License, or (at your option) |
1ae97820 HX |
11 | * any later version. |
12 | * | |
13 | */ | |
14 | ||
5b6d2d7f | 15 | #include <crypto/internal/aead.h> |
996d98d8 | 16 | #include <crypto/scatterwalk.h> |
5b6d2d7f | 17 | #include <linux/err.h> |
1ae97820 HX |
18 | #include <linux/init.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
d29ce988 | 21 | #include <linux/rtnetlink.h> |
d43c36dc | 22 | #include <linux/sched.h> |
1ae97820 HX |
23 | #include <linux/slab.h> |
24 | #include <linux/seq_file.h> | |
6ad414fe SK |
25 | #include <linux/cryptouser.h> |
26 | #include <net/netlink.h> | |
1ae97820 | 27 | |
5b6d2d7f HX |
28 | #include "internal.h" |
29 | ||
5d1d65f8 HX |
30 | static int aead_null_givencrypt(struct aead_givcrypt_request *req); |
31 | static int aead_null_givdecrypt(struct aead_givcrypt_request *req); | |
32 | ||
1ae97820 HX |
33 | static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key, |
34 | unsigned int keylen) | |
35 | { | |
1ae97820 HX |
36 | unsigned long alignmask = crypto_aead_alignmask(tfm); |
37 | int ret; | |
38 | u8 *buffer, *alignbuffer; | |
39 | unsigned long absize; | |
40 | ||
41 | absize = keylen + alignmask; | |
42 | buffer = kmalloc(absize, GFP_ATOMIC); | |
43 | if (!buffer) | |
44 | return -ENOMEM; | |
45 | ||
46 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
47 | memcpy(alignbuffer, key, keylen); | |
63293c61 | 48 | ret = tfm->setkey(tfm, alignbuffer, keylen); |
1ae97820 HX |
49 | memset(alignbuffer, 0, keylen); |
50 | kfree(buffer); | |
51 | return ret; | |
52 | } | |
53 | ||
5d1d65f8 HX |
54 | int crypto_aead_setkey(struct crypto_aead *tfm, |
55 | const u8 *key, unsigned int keylen) | |
1ae97820 | 56 | { |
1ae97820 HX |
57 | unsigned long alignmask = crypto_aead_alignmask(tfm); |
58 | ||
5d1d65f8 HX |
59 | tfm = tfm->child; |
60 | ||
1ae97820 HX |
61 | if ((unsigned long)key & alignmask) |
62 | return setkey_unaligned(tfm, key, keylen); | |
63 | ||
63293c61 | 64 | return tfm->setkey(tfm, key, keylen); |
1ae97820 | 65 | } |
5d1d65f8 | 66 | EXPORT_SYMBOL_GPL(crypto_aead_setkey); |
1ae97820 | 67 | |
7ba683a6 HX |
68 | int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize) |
69 | { | |
70 | int err; | |
71 | ||
63293c61 | 72 | if (authsize > tfm->maxauthsize) |
7ba683a6 HX |
73 | return -EINVAL; |
74 | ||
63293c61 HX |
75 | if (tfm->setauthsize) { |
76 | err = tfm->setauthsize(tfm->child, authsize); | |
7ba683a6 HX |
77 | if (err) |
78 | return err; | |
79 | } | |
80 | ||
5d1d65f8 HX |
81 | tfm->child->authsize = authsize; |
82 | tfm->authsize = authsize; | |
7ba683a6 HX |
83 | return 0; |
84 | } | |
85 | EXPORT_SYMBOL_GPL(crypto_aead_setauthsize); | |
86 | ||
996d98d8 HX |
87 | struct aead_old_request { |
88 | struct scatterlist srcbuf[2]; | |
89 | struct scatterlist dstbuf[2]; | |
90 | struct aead_request subreq; | |
91 | }; | |
92 | ||
93 | unsigned int crypto_aead_reqsize(struct crypto_aead *tfm) | |
94 | { | |
95 | return tfm->reqsize + sizeof(struct aead_old_request); | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(crypto_aead_reqsize); | |
98 | ||
99 | static int old_crypt(struct aead_request *req, | |
100 | int (*crypt)(struct aead_request *req)) | |
101 | { | |
102 | struct aead_old_request *nreq = aead_request_ctx(req); | |
103 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
104 | struct scatterlist *src, *dst; | |
105 | ||
106 | if (req->old) | |
107 | return crypt(req); | |
108 | ||
109 | src = scatterwalk_ffwd(nreq->srcbuf, req->src, | |
110 | req->assoclen + req->cryptoff); | |
111 | dst = scatterwalk_ffwd(nreq->dstbuf, req->dst, | |
112 | req->assoclen + req->cryptoff); | |
113 | ||
114 | aead_request_set_tfm(&nreq->subreq, aead); | |
115 | aead_request_set_callback(&nreq->subreq, aead_request_flags(req), | |
116 | req->base.complete, req->base.data); | |
117 | aead_request_set_crypt(&nreq->subreq, src, dst, req->cryptlen, | |
118 | req->iv); | |
119 | aead_request_set_assoc(&nreq->subreq, req->src, req->assoclen); | |
120 | ||
121 | return crypt(&nreq->subreq); | |
122 | } | |
123 | ||
124 | static int old_encrypt(struct aead_request *req) | |
125 | { | |
126 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
2d0f230f | 127 | struct old_aead_alg *alg = crypto_old_aead_alg(aead); |
996d98d8 HX |
128 | |
129 | return old_crypt(req, alg->encrypt); | |
130 | } | |
131 | ||
132 | static int old_decrypt(struct aead_request *req) | |
133 | { | |
134 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
2d0f230f | 135 | struct old_aead_alg *alg = crypto_old_aead_alg(aead); |
996d98d8 HX |
136 | |
137 | return old_crypt(req, alg->decrypt); | |
138 | } | |
139 | ||
aedb30dc | 140 | static int no_givcrypt(struct aead_givcrypt_request *req) |
743edf57 HX |
141 | { |
142 | return -ENOSYS; | |
143 | } | |
144 | ||
63293c61 | 145 | static int crypto_old_aead_init_tfm(struct crypto_tfm *tfm) |
1ae97820 | 146 | { |
2d0f230f | 147 | struct old_aead_alg *alg = &tfm->__crt_alg->cra_aead; |
5d1d65f8 | 148 | struct crypto_aead *crt = __crypto_aead_cast(tfm); |
1ae97820 | 149 | |
7ba683a6 | 150 | if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8) |
1ae97820 HX |
151 | return -EINVAL; |
152 | ||
63293c61 HX |
153 | crt->setkey = alg->setkey; |
154 | crt->setauthsize = alg->setauthsize; | |
996d98d8 HX |
155 | crt->encrypt = old_encrypt; |
156 | crt->decrypt = old_decrypt; | |
5d1d65f8 HX |
157 | if (alg->ivsize) { |
158 | crt->givencrypt = alg->givencrypt ?: no_givcrypt; | |
159 | crt->givdecrypt = alg->givdecrypt ?: no_givcrypt; | |
160 | } else { | |
161 | crt->givencrypt = aead_null_givencrypt; | |
162 | crt->givdecrypt = aead_null_givdecrypt; | |
163 | } | |
164 | crt->child = __crypto_aead_cast(tfm); | |
1ae97820 | 165 | crt->ivsize = alg->ivsize; |
63293c61 | 166 | crt->maxauthsize = alg->maxauthsize; |
7ba683a6 | 167 | crt->authsize = alg->maxauthsize; |
1ae97820 HX |
168 | |
169 | return 0; | |
170 | } | |
171 | ||
63293c61 HX |
172 | static int crypto_aead_init_tfm(struct crypto_tfm *tfm) |
173 | { | |
174 | struct crypto_aead *aead = __crypto_aead_cast(tfm); | |
175 | struct aead_alg *alg = crypto_aead_alg(aead); | |
176 | ||
177 | if (crypto_old_aead_alg(aead)->encrypt) | |
178 | return crypto_old_aead_init_tfm(tfm); | |
179 | ||
180 | aead->setkey = alg->setkey; | |
181 | aead->setauthsize = alg->setauthsize; | |
182 | aead->encrypt = alg->encrypt; | |
183 | aead->decrypt = alg->decrypt; | |
184 | aead->child = __crypto_aead_cast(tfm); | |
185 | aead->ivsize = alg->ivsize; | |
186 | aead->maxauthsize = alg->maxauthsize; | |
187 | aead->authsize = alg->maxauthsize; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
3acc8473 | 192 | #ifdef CONFIG_NET |
63293c61 | 193 | static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg) |
6ad414fe SK |
194 | { |
195 | struct crypto_report_aead raead; | |
2d0f230f | 196 | struct old_aead_alg *aead = &alg->cra_aead; |
6ad414fe | 197 | |
9a5467bf MK |
198 | strncpy(raead.type, "aead", sizeof(raead.type)); |
199 | strncpy(raead.geniv, aead->geniv ?: "<built-in>", sizeof(raead.geniv)); | |
6ad414fe SK |
200 | |
201 | raead.blocksize = alg->cra_blocksize; | |
202 | raead.maxauthsize = aead->maxauthsize; | |
203 | raead.ivsize = aead->ivsize; | |
204 | ||
6662df33 DM |
205 | if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD, |
206 | sizeof(struct crypto_report_aead), &raead)) | |
207 | goto nla_put_failure; | |
6ad414fe SK |
208 | return 0; |
209 | ||
210 | nla_put_failure: | |
211 | return -EMSGSIZE; | |
212 | } | |
3acc8473 | 213 | #else |
63293c61 | 214 | static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg) |
3acc8473 HX |
215 | { |
216 | return -ENOSYS; | |
217 | } | |
218 | #endif | |
6ad414fe | 219 | |
63293c61 | 220 | static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg) |
1ae97820 | 221 | __attribute__ ((unused)); |
63293c61 | 222 | static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg) |
1ae97820 | 223 | { |
2d0f230f | 224 | struct old_aead_alg *aead = &alg->cra_aead; |
1ae97820 HX |
225 | |
226 | seq_printf(m, "type : aead\n"); | |
189ed66e HX |
227 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
228 | "yes" : "no"); | |
1ae97820 HX |
229 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
230 | seq_printf(m, "ivsize : %u\n", aead->ivsize); | |
7ba683a6 | 231 | seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); |
5b6d2d7f | 232 | seq_printf(m, "geniv : %s\n", aead->geniv ?: "<built-in>"); |
1ae97820 HX |
233 | } |
234 | ||
235 | const struct crypto_type crypto_aead_type = { | |
5d1d65f8 HX |
236 | .extsize = crypto_alg_extsize, |
237 | .init_tfm = crypto_aead_init_tfm, | |
1ae97820 | 238 | #ifdef CONFIG_PROC_FS |
63293c61 | 239 | .show = crypto_old_aead_show, |
1ae97820 | 240 | #endif |
63293c61 | 241 | .report = crypto_old_aead_report, |
5d1d65f8 HX |
242 | .lookup = crypto_lookup_aead, |
243 | .maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV), | |
244 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
245 | .type = CRYPTO_ALG_TYPE_AEAD, | |
246 | .tfmsize = offsetof(struct crypto_aead, base), | |
1ae97820 HX |
247 | }; |
248 | EXPORT_SYMBOL_GPL(crypto_aead_type); | |
249 | ||
63293c61 HX |
250 | #ifdef CONFIG_NET |
251 | static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
252 | { | |
253 | struct crypto_report_aead raead; | |
254 | struct aead_alg *aead = container_of(alg, struct aead_alg, base); | |
255 | ||
256 | strncpy(raead.type, "aead", sizeof(raead.type)); | |
257 | strncpy(raead.geniv, "<none>", sizeof(raead.geniv)); | |
258 | ||
259 | raead.blocksize = alg->cra_blocksize; | |
260 | raead.maxauthsize = aead->maxauthsize; | |
261 | raead.ivsize = aead->ivsize; | |
262 | ||
263 | if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD, | |
264 | sizeof(struct crypto_report_aead), &raead)) | |
265 | goto nla_put_failure; | |
266 | return 0; | |
267 | ||
268 | nla_put_failure: | |
269 | return -EMSGSIZE; | |
270 | } | |
271 | #else | |
272 | static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
273 | { | |
274 | return -ENOSYS; | |
275 | } | |
276 | #endif | |
277 | ||
278 | static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) | |
279 | __attribute__ ((unused)); | |
280 | static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) | |
281 | { | |
282 | struct aead_alg *aead = container_of(alg, struct aead_alg, base); | |
283 | ||
284 | seq_printf(m, "type : aead\n"); | |
285 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
286 | "yes" : "no"); | |
287 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
288 | seq_printf(m, "ivsize : %u\n", aead->ivsize); | |
289 | seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); | |
290 | seq_printf(m, "geniv : <none>\n"); | |
291 | } | |
292 | ||
293 | static const struct crypto_type crypto_new_aead_type = { | |
294 | .extsize = crypto_alg_extsize, | |
295 | .init_tfm = crypto_aead_init_tfm, | |
296 | #ifdef CONFIG_PROC_FS | |
297 | .show = crypto_aead_show, | |
298 | #endif | |
299 | .report = crypto_aead_report, | |
300 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
301 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
302 | .type = CRYPTO_ALG_TYPE_AEAD, | |
303 | .tfmsize = offsetof(struct crypto_aead, base), | |
304 | }; | |
305 | ||
5b6d2d7f HX |
306 | static int aead_null_givencrypt(struct aead_givcrypt_request *req) |
307 | { | |
308 | return crypto_aead_encrypt(&req->areq); | |
309 | } | |
310 | ||
311 | static int aead_null_givdecrypt(struct aead_givcrypt_request *req) | |
312 | { | |
313 | return crypto_aead_decrypt(&req->areq); | |
314 | } | |
315 | ||
3acc8473 | 316 | #ifdef CONFIG_NET |
b735d0a9 SK |
317 | static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg) |
318 | { | |
319 | struct crypto_report_aead raead; | |
2d0f230f | 320 | struct old_aead_alg *aead = &alg->cra_aead; |
b735d0a9 | 321 | |
9a5467bf MK |
322 | strncpy(raead.type, "nivaead", sizeof(raead.type)); |
323 | strncpy(raead.geniv, aead->geniv, sizeof(raead.geniv)); | |
b735d0a9 SK |
324 | |
325 | raead.blocksize = alg->cra_blocksize; | |
326 | raead.maxauthsize = aead->maxauthsize; | |
327 | raead.ivsize = aead->ivsize; | |
328 | ||
6662df33 DM |
329 | if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD, |
330 | sizeof(struct crypto_report_aead), &raead)) | |
331 | goto nla_put_failure; | |
b735d0a9 SK |
332 | return 0; |
333 | ||
334 | nla_put_failure: | |
335 | return -EMSGSIZE; | |
336 | } | |
3acc8473 HX |
337 | #else |
338 | static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
339 | { | |
340 | return -ENOSYS; | |
341 | } | |
342 | #endif | |
b735d0a9 SK |
343 | |
344 | ||
5b6d2d7f HX |
345 | static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg) |
346 | __attribute__ ((unused)); | |
347 | static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg) | |
348 | { | |
2d0f230f | 349 | struct old_aead_alg *aead = &alg->cra_aead; |
5b6d2d7f HX |
350 | |
351 | seq_printf(m, "type : nivaead\n"); | |
189ed66e HX |
352 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
353 | "yes" : "no"); | |
5b6d2d7f HX |
354 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
355 | seq_printf(m, "ivsize : %u\n", aead->ivsize); | |
356 | seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); | |
357 | seq_printf(m, "geniv : %s\n", aead->geniv); | |
358 | } | |
359 | ||
360 | const struct crypto_type crypto_nivaead_type = { | |
5d1d65f8 HX |
361 | .extsize = crypto_alg_extsize, |
362 | .init_tfm = crypto_aead_init_tfm, | |
5b6d2d7f HX |
363 | #ifdef CONFIG_PROC_FS |
364 | .show = crypto_nivaead_show, | |
365 | #endif | |
b735d0a9 | 366 | .report = crypto_nivaead_report, |
5d1d65f8 HX |
367 | .maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV), |
368 | .maskset = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV, | |
369 | .type = CRYPTO_ALG_TYPE_AEAD, | |
370 | .tfmsize = offsetof(struct crypto_aead, base), | |
5b6d2d7f HX |
371 | }; |
372 | EXPORT_SYMBOL_GPL(crypto_nivaead_type); | |
373 | ||
374 | static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn, | |
375 | const char *name, u32 type, u32 mask) | |
376 | { | |
5d1d65f8 HX |
377 | spawn->base.frontend = &crypto_nivaead_type; |
378 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
5b6d2d7f HX |
379 | } |
380 | ||
381 | struct crypto_instance *aead_geniv_alloc(struct crypto_template *tmpl, | |
382 | struct rtattr **tb, u32 type, | |
383 | u32 mask) | |
384 | { | |
385 | const char *name; | |
386 | struct crypto_aead_spawn *spawn; | |
387 | struct crypto_attr_type *algt; | |
388 | struct crypto_instance *inst; | |
389 | struct crypto_alg *alg; | |
390 | int err; | |
391 | ||
392 | algt = crypto_get_attr_type(tb); | |
5b6d2d7f | 393 | if (IS_ERR(algt)) |
3e8afe35 | 394 | return ERR_CAST(algt); |
5b6d2d7f HX |
395 | |
396 | if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) & | |
397 | algt->mask) | |
398 | return ERR_PTR(-EINVAL); | |
399 | ||
400 | name = crypto_attr_alg_name(tb[1]); | |
5b6d2d7f | 401 | if (IS_ERR(name)) |
3e8afe35 | 402 | return ERR_CAST(name); |
5b6d2d7f HX |
403 | |
404 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
405 | if (!inst) | |
406 | return ERR_PTR(-ENOMEM); | |
407 | ||
408 | spawn = crypto_instance_ctx(inst); | |
409 | ||
410 | /* Ignore async algorithms if necessary. */ | |
411 | mask |= crypto_requires_sync(algt->type, algt->mask); | |
412 | ||
413 | crypto_set_aead_spawn(spawn, inst); | |
414 | err = crypto_grab_nivaead(spawn, name, type, mask); | |
415 | if (err) | |
416 | goto err_free_inst; | |
417 | ||
418 | alg = crypto_aead_spawn_alg(spawn); | |
419 | ||
420 | err = -EINVAL; | |
421 | if (!alg->cra_aead.ivsize) | |
422 | goto err_drop_alg; | |
423 | ||
424 | /* | |
425 | * This is only true if we're constructing an algorithm with its | |
426 | * default IV generator. For the default generator we elide the | |
427 | * template name and double-check the IV generator. | |
428 | */ | |
429 | if (algt->mask & CRYPTO_ALG_GENIV) { | |
430 | if (strcmp(tmpl->name, alg->cra_aead.geniv)) | |
431 | goto err_drop_alg; | |
432 | ||
433 | memcpy(inst->alg.cra_name, alg->cra_name, CRYPTO_MAX_ALG_NAME); | |
434 | memcpy(inst->alg.cra_driver_name, alg->cra_driver_name, | |
435 | CRYPTO_MAX_ALG_NAME); | |
436 | } else { | |
437 | err = -ENAMETOOLONG; | |
438 | if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, | |
439 | "%s(%s)", tmpl->name, alg->cra_name) >= | |
440 | CRYPTO_MAX_ALG_NAME) | |
441 | goto err_drop_alg; | |
442 | if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
443 | "%s(%s)", tmpl->name, alg->cra_driver_name) >= | |
444 | CRYPTO_MAX_ALG_NAME) | |
445 | goto err_drop_alg; | |
446 | } | |
447 | ||
448 | inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV; | |
449 | inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC; | |
450 | inst->alg.cra_priority = alg->cra_priority; | |
451 | inst->alg.cra_blocksize = alg->cra_blocksize; | |
452 | inst->alg.cra_alignmask = alg->cra_alignmask; | |
453 | inst->alg.cra_type = &crypto_aead_type; | |
454 | ||
455 | inst->alg.cra_aead.ivsize = alg->cra_aead.ivsize; | |
456 | inst->alg.cra_aead.maxauthsize = alg->cra_aead.maxauthsize; | |
457 | inst->alg.cra_aead.geniv = alg->cra_aead.geniv; | |
458 | ||
459 | inst->alg.cra_aead.setkey = alg->cra_aead.setkey; | |
460 | inst->alg.cra_aead.setauthsize = alg->cra_aead.setauthsize; | |
461 | inst->alg.cra_aead.encrypt = alg->cra_aead.encrypt; | |
462 | inst->alg.cra_aead.decrypt = alg->cra_aead.decrypt; | |
463 | ||
464 | out: | |
465 | return inst; | |
466 | ||
467 | err_drop_alg: | |
468 | crypto_drop_aead(spawn); | |
469 | err_free_inst: | |
470 | kfree(inst); | |
471 | inst = ERR_PTR(err); | |
472 | goto out; | |
473 | } | |
474 | EXPORT_SYMBOL_GPL(aead_geniv_alloc); | |
475 | ||
476 | void aead_geniv_free(struct crypto_instance *inst) | |
477 | { | |
478 | crypto_drop_aead(crypto_instance_ctx(inst)); | |
479 | kfree(inst); | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(aead_geniv_free); | |
482 | ||
483 | int aead_geniv_init(struct crypto_tfm *tfm) | |
484 | { | |
485 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
5d1d65f8 | 486 | struct crypto_aead *child; |
5b6d2d7f HX |
487 | struct crypto_aead *aead; |
488 | ||
5d1d65f8 | 489 | aead = __crypto_aead_cast(tfm); |
5b6d2d7f | 490 | |
5d1d65f8 HX |
491 | child = crypto_spawn_aead(crypto_instance_ctx(inst)); |
492 | if (IS_ERR(child)) | |
493 | return PTR_ERR(child); | |
494 | ||
495 | aead->child = child; | |
496 | aead->reqsize += crypto_aead_reqsize(child); | |
5b6d2d7f HX |
497 | |
498 | return 0; | |
499 | } | |
500 | EXPORT_SYMBOL_GPL(aead_geniv_init); | |
501 | ||
502 | void aead_geniv_exit(struct crypto_tfm *tfm) | |
503 | { | |
5d1d65f8 | 504 | crypto_free_aead(__crypto_aead_cast(tfm)->child); |
5b6d2d7f HX |
505 | } |
506 | EXPORT_SYMBOL_GPL(aead_geniv_exit); | |
507 | ||
d29ce988 HX |
508 | static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask) |
509 | { | |
510 | struct rtattr *tb[3]; | |
511 | struct { | |
512 | struct rtattr attr; | |
513 | struct crypto_attr_type data; | |
514 | } ptype; | |
515 | struct { | |
516 | struct rtattr attr; | |
517 | struct crypto_attr_alg data; | |
518 | } palg; | |
519 | struct crypto_template *tmpl; | |
520 | struct crypto_instance *inst; | |
521 | struct crypto_alg *larval; | |
522 | const char *geniv; | |
523 | int err; | |
524 | ||
525 | larval = crypto_larval_lookup(alg->cra_driver_name, | |
526 | CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV, | |
527 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); | |
528 | err = PTR_ERR(larval); | |
529 | if (IS_ERR(larval)) | |
530 | goto out; | |
531 | ||
532 | err = -EAGAIN; | |
533 | if (!crypto_is_larval(larval)) | |
534 | goto drop_larval; | |
535 | ||
536 | ptype.attr.rta_len = sizeof(ptype); | |
537 | ptype.attr.rta_type = CRYPTOA_TYPE; | |
538 | ptype.data.type = type | CRYPTO_ALG_GENIV; | |
539 | /* GENIV tells the template that we're making a default geniv. */ | |
540 | ptype.data.mask = mask | CRYPTO_ALG_GENIV; | |
541 | tb[0] = &ptype.attr; | |
542 | ||
543 | palg.attr.rta_len = sizeof(palg); | |
544 | palg.attr.rta_type = CRYPTOA_ALG; | |
545 | /* Must use the exact name to locate ourselves. */ | |
546 | memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); | |
547 | tb[1] = &palg.attr; | |
548 | ||
549 | tb[2] = NULL; | |
550 | ||
551 | geniv = alg->cra_aead.geniv; | |
552 | ||
553 | tmpl = crypto_lookup_template(geniv); | |
554 | err = -ENOENT; | |
555 | if (!tmpl) | |
556 | goto kill_larval; | |
557 | ||
558 | inst = tmpl->alloc(tb); | |
559 | err = PTR_ERR(inst); | |
560 | if (IS_ERR(inst)) | |
561 | goto put_tmpl; | |
562 | ||
4fad478a JJ |
563 | err = crypto_register_instance(tmpl, inst); |
564 | if (err) { | |
d29ce988 HX |
565 | tmpl->free(inst); |
566 | goto put_tmpl; | |
567 | } | |
568 | ||
569 | /* Redo the lookup to use the instance we just registered. */ | |
570 | err = -EAGAIN; | |
571 | ||
572 | put_tmpl: | |
573 | crypto_tmpl_put(tmpl); | |
574 | kill_larval: | |
575 | crypto_larval_kill(larval); | |
576 | drop_larval: | |
577 | crypto_mod_put(larval); | |
578 | out: | |
579 | crypto_mod_put(alg); | |
580 | return err; | |
581 | } | |
582 | ||
1e122994 | 583 | struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, u32 mask) |
d29ce988 HX |
584 | { |
585 | struct crypto_alg *alg; | |
586 | ||
587 | alg = crypto_alg_mod_lookup(name, type, mask); | |
588 | if (IS_ERR(alg)) | |
589 | return alg; | |
590 | ||
591 | if (alg->cra_type == &crypto_aead_type) | |
592 | return alg; | |
593 | ||
594 | if (!alg->cra_aead.ivsize) | |
595 | return alg; | |
596 | ||
5852ae42 HX |
597 | crypto_mod_put(alg); |
598 | alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, | |
599 | mask & ~CRYPTO_ALG_TESTED); | |
600 | if (IS_ERR(alg)) | |
601 | return alg; | |
602 | ||
603 | if (alg->cra_type == &crypto_aead_type) { | |
80f7b355 | 604 | if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) { |
5852ae42 HX |
605 | crypto_mod_put(alg); |
606 | alg = ERR_PTR(-ENOENT); | |
607 | } | |
608 | return alg; | |
609 | } | |
610 | ||
611 | BUG_ON(!alg->cra_aead.ivsize); | |
612 | ||
d29ce988 HX |
613 | return ERR_PTR(crypto_nivaead_default(alg, type, mask)); |
614 | } | |
1e122994 | 615 | EXPORT_SYMBOL_GPL(crypto_lookup_aead); |
d29ce988 HX |
616 | |
617 | int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name, | |
618 | u32 type, u32 mask) | |
619 | { | |
5d1d65f8 HX |
620 | spawn->base.frontend = &crypto_aead_type; |
621 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
d29ce988 HX |
622 | } |
623 | EXPORT_SYMBOL_GPL(crypto_grab_aead); | |
624 | ||
625 | struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask) | |
626 | { | |
5d1d65f8 | 627 | return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask); |
d29ce988 HX |
628 | } |
629 | EXPORT_SYMBOL_GPL(crypto_alloc_aead); | |
630 | ||
63293c61 HX |
631 | static int aead_prepare_alg(struct aead_alg *alg) |
632 | { | |
633 | struct crypto_alg *base = &alg->base; | |
634 | ||
635 | if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8) | |
636 | return -EINVAL; | |
637 | ||
638 | base->cra_type = &crypto_new_aead_type; | |
639 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
640 | base->cra_flags |= CRYPTO_ALG_TYPE_AEAD; | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
645 | int crypto_register_aead(struct aead_alg *alg) | |
646 | { | |
647 | struct crypto_alg *base = &alg->base; | |
648 | int err; | |
649 | ||
650 | err = aead_prepare_alg(alg); | |
651 | if (err) | |
652 | return err; | |
653 | ||
654 | return crypto_register_alg(base); | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(crypto_register_aead); | |
657 | ||
658 | int crypto_unregister_aead(struct aead_alg *alg) | |
659 | { | |
660 | return crypto_unregister_alg(&alg->base); | |
661 | } | |
662 | EXPORT_SYMBOL_GPL(crypto_unregister_aead); | |
663 | ||
664 | int aead_register_instance(struct crypto_template *tmpl, | |
665 | struct aead_instance *inst) | |
666 | { | |
667 | int err; | |
668 | ||
669 | err = aead_prepare_alg(&inst->alg); | |
670 | if (err) | |
671 | return err; | |
672 | ||
673 | return crypto_register_instance(tmpl, aead_crypto_instance(inst)); | |
674 | } | |
675 | EXPORT_SYMBOL_GPL(aead_register_instance); | |
676 | ||
1ae97820 HX |
677 | MODULE_LICENSE("GPL"); |
678 | MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)"); |