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 | ||
30e4c010 | 72 | if (authsize > crypto_aead_maxauthsize(tfm)) |
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 | ||
374d4ad1 | 109 | src = scatterwalk_ffwd(nreq->srcbuf, req->src, req->assoclen); |
b455eb80 HX |
110 | dst = req->src == req->dst ? |
111 | src : scatterwalk_ffwd(nreq->dstbuf, req->dst, req->assoclen); | |
996d98d8 HX |
112 | |
113 | aead_request_set_tfm(&nreq->subreq, aead); | |
114 | aead_request_set_callback(&nreq->subreq, aead_request_flags(req), | |
115 | req->base.complete, req->base.data); | |
116 | aead_request_set_crypt(&nreq->subreq, src, dst, req->cryptlen, | |
117 | req->iv); | |
118 | aead_request_set_assoc(&nreq->subreq, req->src, req->assoclen); | |
119 | ||
120 | return crypt(&nreq->subreq); | |
121 | } | |
122 | ||
123 | static int old_encrypt(struct aead_request *req) | |
124 | { | |
125 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
2d0f230f | 126 | struct old_aead_alg *alg = crypto_old_aead_alg(aead); |
996d98d8 HX |
127 | |
128 | return old_crypt(req, alg->encrypt); | |
129 | } | |
130 | ||
131 | static int old_decrypt(struct aead_request *req) | |
132 | { | |
133 | struct crypto_aead *aead = crypto_aead_reqtfm(req); | |
2d0f230f | 134 | struct old_aead_alg *alg = crypto_old_aead_alg(aead); |
996d98d8 HX |
135 | |
136 | return old_crypt(req, alg->decrypt); | |
137 | } | |
138 | ||
aedb30dc | 139 | static int no_givcrypt(struct aead_givcrypt_request *req) |
743edf57 HX |
140 | { |
141 | return -ENOSYS; | |
142 | } | |
143 | ||
63293c61 | 144 | static int crypto_old_aead_init_tfm(struct crypto_tfm *tfm) |
1ae97820 | 145 | { |
2d0f230f | 146 | struct old_aead_alg *alg = &tfm->__crt_alg->cra_aead; |
5d1d65f8 | 147 | struct crypto_aead *crt = __crypto_aead_cast(tfm); |
1ae97820 | 148 | |
7ba683a6 | 149 | if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8) |
1ae97820 HX |
150 | return -EINVAL; |
151 | ||
63293c61 HX |
152 | crt->setkey = alg->setkey; |
153 | crt->setauthsize = alg->setauthsize; | |
996d98d8 HX |
154 | crt->encrypt = old_encrypt; |
155 | crt->decrypt = old_decrypt; | |
5d1d65f8 HX |
156 | if (alg->ivsize) { |
157 | crt->givencrypt = alg->givencrypt ?: no_givcrypt; | |
158 | crt->givdecrypt = alg->givdecrypt ?: no_givcrypt; | |
159 | } else { | |
160 | crt->givencrypt = aead_null_givencrypt; | |
161 | crt->givdecrypt = aead_null_givdecrypt; | |
162 | } | |
163 | crt->child = __crypto_aead_cast(tfm); | |
7ba683a6 | 164 | crt->authsize = alg->maxauthsize; |
1ae97820 HX |
165 | |
166 | return 0; | |
167 | } | |
168 | ||
63293c61 HX |
169 | static int crypto_aead_init_tfm(struct crypto_tfm *tfm) |
170 | { | |
171 | struct crypto_aead *aead = __crypto_aead_cast(tfm); | |
172 | struct aead_alg *alg = crypto_aead_alg(aead); | |
173 | ||
174 | if (crypto_old_aead_alg(aead)->encrypt) | |
175 | return crypto_old_aead_init_tfm(tfm); | |
176 | ||
177 | aead->setkey = alg->setkey; | |
178 | aead->setauthsize = alg->setauthsize; | |
179 | aead->encrypt = alg->encrypt; | |
180 | aead->decrypt = alg->decrypt; | |
181 | aead->child = __crypto_aead_cast(tfm); | |
63293c61 HX |
182 | aead->authsize = alg->maxauthsize; |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
3acc8473 | 187 | #ifdef CONFIG_NET |
63293c61 | 188 | static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg) |
6ad414fe SK |
189 | { |
190 | struct crypto_report_aead raead; | |
2d0f230f | 191 | struct old_aead_alg *aead = &alg->cra_aead; |
6ad414fe | 192 | |
9a5467bf MK |
193 | strncpy(raead.type, "aead", sizeof(raead.type)); |
194 | strncpy(raead.geniv, aead->geniv ?: "<built-in>", sizeof(raead.geniv)); | |
6ad414fe SK |
195 | |
196 | raead.blocksize = alg->cra_blocksize; | |
197 | raead.maxauthsize = aead->maxauthsize; | |
198 | raead.ivsize = aead->ivsize; | |
199 | ||
6662df33 DM |
200 | if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD, |
201 | sizeof(struct crypto_report_aead), &raead)) | |
202 | goto nla_put_failure; | |
6ad414fe SK |
203 | return 0; |
204 | ||
205 | nla_put_failure: | |
206 | return -EMSGSIZE; | |
207 | } | |
3acc8473 | 208 | #else |
63293c61 | 209 | static int crypto_old_aead_report(struct sk_buff *skb, struct crypto_alg *alg) |
3acc8473 HX |
210 | { |
211 | return -ENOSYS; | |
212 | } | |
213 | #endif | |
6ad414fe | 214 | |
63293c61 | 215 | static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg) |
1ae97820 | 216 | __attribute__ ((unused)); |
63293c61 | 217 | static void crypto_old_aead_show(struct seq_file *m, struct crypto_alg *alg) |
1ae97820 | 218 | { |
2d0f230f | 219 | struct old_aead_alg *aead = &alg->cra_aead; |
1ae97820 HX |
220 | |
221 | seq_printf(m, "type : aead\n"); | |
189ed66e HX |
222 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
223 | "yes" : "no"); | |
1ae97820 HX |
224 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
225 | seq_printf(m, "ivsize : %u\n", aead->ivsize); | |
7ba683a6 | 226 | seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); |
5b6d2d7f | 227 | seq_printf(m, "geniv : %s\n", aead->geniv ?: "<built-in>"); |
1ae97820 HX |
228 | } |
229 | ||
230 | const struct crypto_type crypto_aead_type = { | |
5d1d65f8 HX |
231 | .extsize = crypto_alg_extsize, |
232 | .init_tfm = crypto_aead_init_tfm, | |
1ae97820 | 233 | #ifdef CONFIG_PROC_FS |
63293c61 | 234 | .show = crypto_old_aead_show, |
1ae97820 | 235 | #endif |
63293c61 | 236 | .report = crypto_old_aead_report, |
5d1d65f8 HX |
237 | .lookup = crypto_lookup_aead, |
238 | .maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV), | |
239 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
240 | .type = CRYPTO_ALG_TYPE_AEAD, | |
241 | .tfmsize = offsetof(struct crypto_aead, base), | |
1ae97820 HX |
242 | }; |
243 | EXPORT_SYMBOL_GPL(crypto_aead_type); | |
244 | ||
63293c61 HX |
245 | #ifdef CONFIG_NET |
246 | static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
247 | { | |
248 | struct crypto_report_aead raead; | |
249 | struct aead_alg *aead = container_of(alg, struct aead_alg, base); | |
250 | ||
251 | strncpy(raead.type, "aead", sizeof(raead.type)); | |
252 | strncpy(raead.geniv, "<none>", sizeof(raead.geniv)); | |
253 | ||
254 | raead.blocksize = alg->cra_blocksize; | |
255 | raead.maxauthsize = aead->maxauthsize; | |
256 | raead.ivsize = aead->ivsize; | |
257 | ||
258 | if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD, | |
259 | sizeof(struct crypto_report_aead), &raead)) | |
260 | goto nla_put_failure; | |
261 | return 0; | |
262 | ||
263 | nla_put_failure: | |
264 | return -EMSGSIZE; | |
265 | } | |
266 | #else | |
267 | static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
268 | { | |
269 | return -ENOSYS; | |
270 | } | |
271 | #endif | |
272 | ||
273 | static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) | |
274 | __attribute__ ((unused)); | |
275 | static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) | |
276 | { | |
277 | struct aead_alg *aead = container_of(alg, struct aead_alg, base); | |
278 | ||
279 | seq_printf(m, "type : aead\n"); | |
280 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
281 | "yes" : "no"); | |
282 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
283 | seq_printf(m, "ivsize : %u\n", aead->ivsize); | |
284 | seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); | |
285 | seq_printf(m, "geniv : <none>\n"); | |
286 | } | |
287 | ||
288 | static const struct crypto_type crypto_new_aead_type = { | |
289 | .extsize = crypto_alg_extsize, | |
290 | .init_tfm = crypto_aead_init_tfm, | |
291 | #ifdef CONFIG_PROC_FS | |
292 | .show = crypto_aead_show, | |
293 | #endif | |
294 | .report = crypto_aead_report, | |
295 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
296 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
297 | .type = CRYPTO_ALG_TYPE_AEAD, | |
298 | .tfmsize = offsetof(struct crypto_aead, base), | |
299 | }; | |
300 | ||
5b6d2d7f HX |
301 | static int aead_null_givencrypt(struct aead_givcrypt_request *req) |
302 | { | |
303 | return crypto_aead_encrypt(&req->areq); | |
304 | } | |
305 | ||
306 | static int aead_null_givdecrypt(struct aead_givcrypt_request *req) | |
307 | { | |
308 | return crypto_aead_decrypt(&req->areq); | |
309 | } | |
310 | ||
3acc8473 | 311 | #ifdef CONFIG_NET |
b735d0a9 SK |
312 | static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg) |
313 | { | |
314 | struct crypto_report_aead raead; | |
2d0f230f | 315 | struct old_aead_alg *aead = &alg->cra_aead; |
b735d0a9 | 316 | |
9a5467bf MK |
317 | strncpy(raead.type, "nivaead", sizeof(raead.type)); |
318 | strncpy(raead.geniv, aead->geniv, sizeof(raead.geniv)); | |
b735d0a9 SK |
319 | |
320 | raead.blocksize = alg->cra_blocksize; | |
321 | raead.maxauthsize = aead->maxauthsize; | |
322 | raead.ivsize = aead->ivsize; | |
323 | ||
6662df33 DM |
324 | if (nla_put(skb, CRYPTOCFGA_REPORT_AEAD, |
325 | sizeof(struct crypto_report_aead), &raead)) | |
326 | goto nla_put_failure; | |
b735d0a9 SK |
327 | return 0; |
328 | ||
329 | nla_put_failure: | |
330 | return -EMSGSIZE; | |
331 | } | |
3acc8473 HX |
332 | #else |
333 | static int crypto_nivaead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
334 | { | |
335 | return -ENOSYS; | |
336 | } | |
337 | #endif | |
b735d0a9 SK |
338 | |
339 | ||
5b6d2d7f HX |
340 | static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg) |
341 | __attribute__ ((unused)); | |
342 | static void crypto_nivaead_show(struct seq_file *m, struct crypto_alg *alg) | |
343 | { | |
2d0f230f | 344 | struct old_aead_alg *aead = &alg->cra_aead; |
5b6d2d7f HX |
345 | |
346 | seq_printf(m, "type : nivaead\n"); | |
189ed66e HX |
347 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? |
348 | "yes" : "no"); | |
5b6d2d7f HX |
349 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); |
350 | seq_printf(m, "ivsize : %u\n", aead->ivsize); | |
351 | seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); | |
352 | seq_printf(m, "geniv : %s\n", aead->geniv); | |
353 | } | |
354 | ||
355 | const struct crypto_type crypto_nivaead_type = { | |
5d1d65f8 HX |
356 | .extsize = crypto_alg_extsize, |
357 | .init_tfm = crypto_aead_init_tfm, | |
5b6d2d7f HX |
358 | #ifdef CONFIG_PROC_FS |
359 | .show = crypto_nivaead_show, | |
360 | #endif | |
b735d0a9 | 361 | .report = crypto_nivaead_report, |
5d1d65f8 HX |
362 | .maskclear = ~(CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV), |
363 | .maskset = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV, | |
364 | .type = CRYPTO_ALG_TYPE_AEAD, | |
365 | .tfmsize = offsetof(struct crypto_aead, base), | |
5b6d2d7f HX |
366 | }; |
367 | EXPORT_SYMBOL_GPL(crypto_nivaead_type); | |
368 | ||
369 | static int crypto_grab_nivaead(struct crypto_aead_spawn *spawn, | |
370 | const char *name, u32 type, u32 mask) | |
371 | { | |
5d1d65f8 HX |
372 | spawn->base.frontend = &crypto_nivaead_type; |
373 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
5b6d2d7f HX |
374 | } |
375 | ||
856e3f40 HX |
376 | struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl, |
377 | struct rtattr **tb, u32 type, u32 mask) | |
5b6d2d7f HX |
378 | { |
379 | const char *name; | |
380 | struct crypto_aead_spawn *spawn; | |
381 | struct crypto_attr_type *algt; | |
856e3f40 HX |
382 | struct aead_instance *inst; |
383 | struct aead_alg *alg; | |
384 | unsigned int ivsize; | |
385 | unsigned int maxauthsize; | |
5b6d2d7f HX |
386 | int err; |
387 | ||
388 | algt = crypto_get_attr_type(tb); | |
5b6d2d7f | 389 | if (IS_ERR(algt)) |
3e8afe35 | 390 | return ERR_CAST(algt); |
5b6d2d7f HX |
391 | |
392 | if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV)) & | |
393 | algt->mask) | |
394 | return ERR_PTR(-EINVAL); | |
395 | ||
396 | name = crypto_attr_alg_name(tb[1]); | |
5b6d2d7f | 397 | if (IS_ERR(name)) |
3e8afe35 | 398 | return ERR_CAST(name); |
5b6d2d7f HX |
399 | |
400 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
401 | if (!inst) | |
402 | return ERR_PTR(-ENOMEM); | |
403 | ||
856e3f40 | 404 | spawn = aead_instance_ctx(inst); |
5b6d2d7f HX |
405 | |
406 | /* Ignore async algorithms if necessary. */ | |
407 | mask |= crypto_requires_sync(algt->type, algt->mask); | |
408 | ||
856e3f40 | 409 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
5b6d2d7f HX |
410 | err = crypto_grab_nivaead(spawn, name, type, mask); |
411 | if (err) | |
412 | goto err_free_inst; | |
413 | ||
856e3f40 HX |
414 | alg = crypto_spawn_aead_alg(spawn); |
415 | ||
30e4c010 HX |
416 | ivsize = crypto_aead_alg_ivsize(alg); |
417 | maxauthsize = crypto_aead_alg_maxauthsize(alg); | |
5b6d2d7f HX |
418 | |
419 | err = -EINVAL; | |
856e3f40 | 420 | if (!ivsize) |
5b6d2d7f HX |
421 | goto err_drop_alg; |
422 | ||
423 | /* | |
424 | * This is only true if we're constructing an algorithm with its | |
425 | * default IV generator. For the default generator we elide the | |
426 | * template name and double-check the IV generator. | |
427 | */ | |
428 | if (algt->mask & CRYPTO_ALG_GENIV) { | |
856e3f40 HX |
429 | if (!alg->base.cra_aead.encrypt) |
430 | goto err_drop_alg; | |
431 | if (strcmp(tmpl->name, alg->base.cra_aead.geniv)) | |
5b6d2d7f HX |
432 | goto err_drop_alg; |
433 | ||
856e3f40 | 434 | memcpy(inst->alg.base.cra_name, alg->base.cra_name, |
5b6d2d7f | 435 | CRYPTO_MAX_ALG_NAME); |
856e3f40 HX |
436 | memcpy(inst->alg.base.cra_driver_name, |
437 | alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME); | |
438 | ||
439 | inst->alg.base.cra_flags = CRYPTO_ALG_TYPE_AEAD | | |
440 | CRYPTO_ALG_GENIV; | |
441 | inst->alg.base.cra_flags |= alg->base.cra_flags & | |
442 | CRYPTO_ALG_ASYNC; | |
443 | inst->alg.base.cra_priority = alg->base.cra_priority; | |
444 | inst->alg.base.cra_blocksize = alg->base.cra_blocksize; | |
445 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
446 | inst->alg.base.cra_type = &crypto_aead_type; | |
447 | ||
448 | inst->alg.base.cra_aead.ivsize = ivsize; | |
449 | inst->alg.base.cra_aead.maxauthsize = maxauthsize; | |
450 | ||
451 | inst->alg.base.cra_aead.setkey = alg->base.cra_aead.setkey; | |
452 | inst->alg.base.cra_aead.setauthsize = | |
453 | alg->base.cra_aead.setauthsize; | |
454 | inst->alg.base.cra_aead.encrypt = alg->base.cra_aead.encrypt; | |
455 | inst->alg.base.cra_aead.decrypt = alg->base.cra_aead.decrypt; | |
456 | ||
457 | goto out; | |
5b6d2d7f HX |
458 | } |
459 | ||
856e3f40 HX |
460 | err = -ENAMETOOLONG; |
461 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
462 | "%s(%s)", tmpl->name, alg->base.cra_name) >= | |
463 | CRYPTO_MAX_ALG_NAME) | |
464 | goto err_drop_alg; | |
465 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
466 | "%s(%s)", tmpl->name, alg->base.cra_driver_name) >= | |
467 | CRYPTO_MAX_ALG_NAME) | |
468 | goto err_drop_alg; | |
5b6d2d7f | 469 | |
d1ee1f02 | 470 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
856e3f40 HX |
471 | inst->alg.base.cra_priority = alg->base.cra_priority; |
472 | inst->alg.base.cra_blocksize = alg->base.cra_blocksize; | |
473 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
5b6d2d7f | 474 | |
856e3f40 HX |
475 | inst->alg.ivsize = ivsize; |
476 | inst->alg.maxauthsize = maxauthsize; | |
5b6d2d7f HX |
477 | |
478 | out: | |
479 | return inst; | |
480 | ||
481 | err_drop_alg: | |
482 | crypto_drop_aead(spawn); | |
483 | err_free_inst: | |
484 | kfree(inst); | |
485 | inst = ERR_PTR(err); | |
486 | goto out; | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(aead_geniv_alloc); | |
489 | ||
856e3f40 | 490 | void aead_geniv_free(struct aead_instance *inst) |
5b6d2d7f | 491 | { |
856e3f40 | 492 | crypto_drop_aead(aead_instance_ctx(inst)); |
5b6d2d7f HX |
493 | kfree(inst); |
494 | } | |
495 | EXPORT_SYMBOL_GPL(aead_geniv_free); | |
496 | ||
497 | int aead_geniv_init(struct crypto_tfm *tfm) | |
498 | { | |
499 | struct crypto_instance *inst = (void *)tfm->__crt_alg; | |
5d1d65f8 | 500 | struct crypto_aead *child; |
5b6d2d7f HX |
501 | struct crypto_aead *aead; |
502 | ||
5d1d65f8 | 503 | aead = __crypto_aead_cast(tfm); |
5b6d2d7f | 504 | |
5d1d65f8 HX |
505 | child = crypto_spawn_aead(crypto_instance_ctx(inst)); |
506 | if (IS_ERR(child)) | |
507 | return PTR_ERR(child); | |
508 | ||
509 | aead->child = child; | |
510 | aead->reqsize += crypto_aead_reqsize(child); | |
5b6d2d7f HX |
511 | |
512 | return 0; | |
513 | } | |
514 | EXPORT_SYMBOL_GPL(aead_geniv_init); | |
515 | ||
516 | void aead_geniv_exit(struct crypto_tfm *tfm) | |
517 | { | |
5d1d65f8 | 518 | crypto_free_aead(__crypto_aead_cast(tfm)->child); |
5b6d2d7f HX |
519 | } |
520 | EXPORT_SYMBOL_GPL(aead_geniv_exit); | |
521 | ||
d29ce988 HX |
522 | static int crypto_nivaead_default(struct crypto_alg *alg, u32 type, u32 mask) |
523 | { | |
524 | struct rtattr *tb[3]; | |
525 | struct { | |
526 | struct rtattr attr; | |
527 | struct crypto_attr_type data; | |
528 | } ptype; | |
529 | struct { | |
530 | struct rtattr attr; | |
531 | struct crypto_attr_alg data; | |
532 | } palg; | |
533 | struct crypto_template *tmpl; | |
534 | struct crypto_instance *inst; | |
535 | struct crypto_alg *larval; | |
536 | const char *geniv; | |
537 | int err; | |
538 | ||
539 | larval = crypto_larval_lookup(alg->cra_driver_name, | |
540 | CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_GENIV, | |
541 | CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_GENIV); | |
542 | err = PTR_ERR(larval); | |
543 | if (IS_ERR(larval)) | |
544 | goto out; | |
545 | ||
546 | err = -EAGAIN; | |
547 | if (!crypto_is_larval(larval)) | |
548 | goto drop_larval; | |
549 | ||
550 | ptype.attr.rta_len = sizeof(ptype); | |
551 | ptype.attr.rta_type = CRYPTOA_TYPE; | |
552 | ptype.data.type = type | CRYPTO_ALG_GENIV; | |
553 | /* GENIV tells the template that we're making a default geniv. */ | |
554 | ptype.data.mask = mask | CRYPTO_ALG_GENIV; | |
555 | tb[0] = &ptype.attr; | |
556 | ||
557 | palg.attr.rta_len = sizeof(palg); | |
558 | palg.attr.rta_type = CRYPTOA_ALG; | |
559 | /* Must use the exact name to locate ourselves. */ | |
560 | memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); | |
561 | tb[1] = &palg.attr; | |
562 | ||
563 | tb[2] = NULL; | |
564 | ||
565 | geniv = alg->cra_aead.geniv; | |
566 | ||
567 | tmpl = crypto_lookup_template(geniv); | |
568 | err = -ENOENT; | |
569 | if (!tmpl) | |
570 | goto kill_larval; | |
571 | ||
72af865d HX |
572 | if (tmpl->create) { |
573 | err = tmpl->create(tmpl, tb); | |
574 | if (err) | |
575 | goto put_tmpl; | |
576 | goto ok; | |
577 | } | |
578 | ||
d29ce988 HX |
579 | inst = tmpl->alloc(tb); |
580 | err = PTR_ERR(inst); | |
581 | if (IS_ERR(inst)) | |
582 | goto put_tmpl; | |
583 | ||
4fad478a JJ |
584 | err = crypto_register_instance(tmpl, inst); |
585 | if (err) { | |
d29ce988 HX |
586 | tmpl->free(inst); |
587 | goto put_tmpl; | |
588 | } | |
589 | ||
72af865d | 590 | ok: |
d29ce988 HX |
591 | /* Redo the lookup to use the instance we just registered. */ |
592 | err = -EAGAIN; | |
593 | ||
594 | put_tmpl: | |
595 | crypto_tmpl_put(tmpl); | |
596 | kill_larval: | |
597 | crypto_larval_kill(larval); | |
598 | drop_larval: | |
599 | crypto_mod_put(larval); | |
600 | out: | |
601 | crypto_mod_put(alg); | |
602 | return err; | |
603 | } | |
604 | ||
1e122994 | 605 | struct crypto_alg *crypto_lookup_aead(const char *name, u32 type, u32 mask) |
d29ce988 HX |
606 | { |
607 | struct crypto_alg *alg; | |
608 | ||
609 | alg = crypto_alg_mod_lookup(name, type, mask); | |
610 | if (IS_ERR(alg)) | |
611 | return alg; | |
612 | ||
613 | if (alg->cra_type == &crypto_aead_type) | |
614 | return alg; | |
615 | ||
616 | if (!alg->cra_aead.ivsize) | |
617 | return alg; | |
618 | ||
5852ae42 HX |
619 | crypto_mod_put(alg); |
620 | alg = crypto_alg_mod_lookup(name, type | CRYPTO_ALG_TESTED, | |
621 | mask & ~CRYPTO_ALG_TESTED); | |
622 | if (IS_ERR(alg)) | |
623 | return alg; | |
624 | ||
625 | if (alg->cra_type == &crypto_aead_type) { | |
80f7b355 | 626 | if (~alg->cra_flags & (type ^ ~mask) & CRYPTO_ALG_TESTED) { |
5852ae42 HX |
627 | crypto_mod_put(alg); |
628 | alg = ERR_PTR(-ENOENT); | |
629 | } | |
630 | return alg; | |
631 | } | |
632 | ||
633 | BUG_ON(!alg->cra_aead.ivsize); | |
634 | ||
d29ce988 HX |
635 | return ERR_PTR(crypto_nivaead_default(alg, type, mask)); |
636 | } | |
1e122994 | 637 | EXPORT_SYMBOL_GPL(crypto_lookup_aead); |
d29ce988 HX |
638 | |
639 | int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name, | |
640 | u32 type, u32 mask) | |
641 | { | |
5d1d65f8 HX |
642 | spawn->base.frontend = &crypto_aead_type; |
643 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
d29ce988 HX |
644 | } |
645 | EXPORT_SYMBOL_GPL(crypto_grab_aead); | |
646 | ||
647 | struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask) | |
648 | { | |
5d1d65f8 | 649 | return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask); |
d29ce988 HX |
650 | } |
651 | EXPORT_SYMBOL_GPL(crypto_alloc_aead); | |
652 | ||
63293c61 HX |
653 | static int aead_prepare_alg(struct aead_alg *alg) |
654 | { | |
655 | struct crypto_alg *base = &alg->base; | |
656 | ||
657 | if (max(alg->maxauthsize, alg->ivsize) > PAGE_SIZE / 8) | |
658 | return -EINVAL; | |
659 | ||
660 | base->cra_type = &crypto_new_aead_type; | |
661 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; | |
662 | base->cra_flags |= CRYPTO_ALG_TYPE_AEAD; | |
663 | ||
664 | return 0; | |
665 | } | |
666 | ||
667 | int crypto_register_aead(struct aead_alg *alg) | |
668 | { | |
669 | struct crypto_alg *base = &alg->base; | |
670 | int err; | |
671 | ||
672 | err = aead_prepare_alg(alg); | |
673 | if (err) | |
674 | return err; | |
675 | ||
676 | return crypto_register_alg(base); | |
677 | } | |
678 | EXPORT_SYMBOL_GPL(crypto_register_aead); | |
679 | ||
680 | int crypto_unregister_aead(struct aead_alg *alg) | |
681 | { | |
682 | return crypto_unregister_alg(&alg->base); | |
683 | } | |
684 | EXPORT_SYMBOL_GPL(crypto_unregister_aead); | |
685 | ||
686 | int aead_register_instance(struct crypto_template *tmpl, | |
687 | struct aead_instance *inst) | |
688 | { | |
689 | int err; | |
690 | ||
691 | err = aead_prepare_alg(&inst->alg); | |
692 | if (err) | |
693 | return err; | |
694 | ||
695 | return crypto_register_instance(tmpl, aead_crypto_instance(inst)); | |
696 | } | |
697 | EXPORT_SYMBOL_GPL(aead_register_instance); | |
698 | ||
1ae97820 HX |
699 | MODULE_LICENSE("GPL"); |
700 | MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)"); |