Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1ae97820 HX |
2 | /* |
3 | * AEAD: Authenticated Encryption with Associated Data | |
3922538f | 4 | * |
1ae97820 HX |
5 | * This file provides API support for AEAD algorithms. |
6 | * | |
b0d955ba | 7 | * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> |
1ae97820 HX |
8 | */ |
9 | ||
6350449f | 10 | #include <crypto/internal/geniv.h> |
149a3971 HX |
11 | #include <crypto/internal/rng.h> |
12 | #include <crypto/null.h> | |
996d98d8 | 13 | #include <crypto/scatterwalk.h> |
5b6d2d7f | 14 | #include <linux/err.h> |
1ae97820 HX |
15 | #include <linux/init.h> |
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
d29ce988 | 18 | #include <linux/rtnetlink.h> |
1ae97820 HX |
19 | #include <linux/slab.h> |
20 | #include <linux/seq_file.h> | |
6ad414fe | 21 | #include <linux/cryptouser.h> |
d8c34b94 | 22 | #include <linux/compiler.h> |
6ad414fe | 23 | #include <net/netlink.h> |
1ae97820 | 24 | |
5b6d2d7f HX |
25 | #include "internal.h" |
26 | ||
1ae97820 HX |
27 | static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key, |
28 | unsigned int keylen) | |
29 | { | |
1ae97820 HX |
30 | unsigned long alignmask = crypto_aead_alignmask(tfm); |
31 | int ret; | |
32 | u8 *buffer, *alignbuffer; | |
33 | unsigned long absize; | |
34 | ||
35 | absize = keylen + alignmask; | |
36 | buffer = kmalloc(absize, GFP_ATOMIC); | |
37 | if (!buffer) | |
38 | return -ENOMEM; | |
39 | ||
40 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
41 | memcpy(alignbuffer, key, keylen); | |
b0d955ba | 42 | ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen); |
1ae97820 HX |
43 | memset(alignbuffer, 0, keylen); |
44 | kfree(buffer); | |
45 | return ret; | |
46 | } | |
47 | ||
5d1d65f8 HX |
48 | int crypto_aead_setkey(struct crypto_aead *tfm, |
49 | const u8 *key, unsigned int keylen) | |
1ae97820 | 50 | { |
1ae97820 | 51 | unsigned long alignmask = crypto_aead_alignmask(tfm); |
dc26c17f | 52 | int err; |
1ae97820 HX |
53 | |
54 | if ((unsigned long)key & alignmask) | |
dc26c17f EB |
55 | err = setkey_unaligned(tfm, key, keylen); |
56 | else | |
57 | err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen); | |
58 | ||
6ebc9700 EB |
59 | if (unlikely(err)) { |
60 | crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY); | |
dc26c17f | 61 | return err; |
6ebc9700 | 62 | } |
1ae97820 | 63 | |
dc26c17f EB |
64 | crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
65 | return 0; | |
1ae97820 | 66 | } |
5d1d65f8 | 67 | EXPORT_SYMBOL_GPL(crypto_aead_setkey); |
1ae97820 | 68 | |
7ba683a6 HX |
69 | int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize) |
70 | { | |
71 | int err; | |
72 | ||
30e4c010 | 73 | if (authsize > crypto_aead_maxauthsize(tfm)) |
7ba683a6 HX |
74 | return -EINVAL; |
75 | ||
b0d955ba HX |
76 | if (crypto_aead_alg(tfm)->setauthsize) { |
77 | err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize); | |
7ba683a6 HX |
78 | if (err) |
79 | return err; | |
80 | } | |
81 | ||
5d1d65f8 | 82 | tfm->authsize = authsize; |
7ba683a6 HX |
83 | return 0; |
84 | } | |
85 | EXPORT_SYMBOL_GPL(crypto_aead_setauthsize); | |
86 | ||
5eb8ec6d HX |
87 | static void crypto_aead_exit_tfm(struct crypto_tfm *tfm) |
88 | { | |
89 | struct crypto_aead *aead = __crypto_aead_cast(tfm); | |
90 | struct aead_alg *alg = crypto_aead_alg(aead); | |
91 | ||
92 | alg->exit(aead); | |
93 | } | |
94 | ||
63293c61 HX |
95 | static int crypto_aead_init_tfm(struct crypto_tfm *tfm) |
96 | { | |
97 | struct crypto_aead *aead = __crypto_aead_cast(tfm); | |
98 | struct aead_alg *alg = crypto_aead_alg(aead); | |
99 | ||
dc26c17f EB |
100 | crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY); |
101 | ||
63293c61 HX |
102 | aead->authsize = alg->maxauthsize; |
103 | ||
5eb8ec6d HX |
104 | if (alg->exit) |
105 | aead->base.exit = crypto_aead_exit_tfm; | |
106 | ||
107 | if (alg->init) | |
108 | return alg->init(aead); | |
109 | ||
63293c61 HX |
110 | return 0; |
111 | } | |
112 | ||
63293c61 HX |
113 | #ifdef CONFIG_NET |
114 | static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
115 | { | |
116 | struct crypto_report_aead raead; | |
117 | struct aead_alg *aead = container_of(alg, struct aead_alg, base); | |
118 | ||
37db69e0 EB |
119 | memset(&raead, 0, sizeof(raead)); |
120 | ||
121 | strscpy(raead.type, "aead", sizeof(raead.type)); | |
122 | strscpy(raead.geniv, "<none>", sizeof(raead.geniv)); | |
63293c61 HX |
123 | |
124 | raead.blocksize = alg->cra_blocksize; | |
125 | raead.maxauthsize = aead->maxauthsize; | |
126 | raead.ivsize = aead->ivsize; | |
127 | ||
37db69e0 | 128 | return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead); |
63293c61 HX |
129 | } |
130 | #else | |
131 | static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
132 | { | |
133 | return -ENOSYS; | |
134 | } | |
135 | #endif | |
136 | ||
137 | static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) | |
d8c34b94 | 138 | __maybe_unused; |
63293c61 HX |
139 | static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) |
140 | { | |
141 | struct aead_alg *aead = container_of(alg, struct aead_alg, base); | |
142 | ||
143 | seq_printf(m, "type : aead\n"); | |
144 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
145 | "yes" : "no"); | |
146 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
147 | seq_printf(m, "ivsize : %u\n", aead->ivsize); | |
148 | seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); | |
149 | seq_printf(m, "geniv : <none>\n"); | |
150 | } | |
151 | ||
ba75e15f HX |
152 | static void crypto_aead_free_instance(struct crypto_instance *inst) |
153 | { | |
154 | struct aead_instance *aead = aead_instance(inst); | |
155 | ||
156 | if (!aead->free) { | |
157 | inst->tmpl->free(inst); | |
158 | return; | |
159 | } | |
160 | ||
161 | aead->free(aead); | |
162 | } | |
163 | ||
b0d955ba | 164 | static const struct crypto_type crypto_aead_type = { |
63293c61 HX |
165 | .extsize = crypto_alg_extsize, |
166 | .init_tfm = crypto_aead_init_tfm, | |
ba75e15f | 167 | .free = crypto_aead_free_instance, |
63293c61 HX |
168 | #ifdef CONFIG_PROC_FS |
169 | .show = crypto_aead_show, | |
170 | #endif | |
171 | .report = crypto_aead_report, | |
172 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
173 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
174 | .type = CRYPTO_ALG_TYPE_AEAD, | |
175 | .tfmsize = offsetof(struct crypto_aead, base), | |
176 | }; | |
177 | ||
6350449f HX |
178 | static int aead_geniv_setkey(struct crypto_aead *tfm, |
179 | const u8 *key, unsigned int keylen) | |
180 | { | |
181 | struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm); | |
182 | ||
183 | return crypto_aead_setkey(ctx->child, key, keylen); | |
184 | } | |
185 | ||
186 | static int aead_geniv_setauthsize(struct crypto_aead *tfm, | |
187 | unsigned int authsize) | |
188 | { | |
189 | struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm); | |
190 | ||
191 | return crypto_aead_setauthsize(ctx->child, authsize); | |
192 | } | |
193 | ||
856e3f40 HX |
194 | struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl, |
195 | struct rtattr **tb, u32 type, u32 mask) | |
5b6d2d7f HX |
196 | { |
197 | const char *name; | |
198 | struct crypto_aead_spawn *spawn; | |
199 | struct crypto_attr_type *algt; | |
856e3f40 HX |
200 | struct aead_instance *inst; |
201 | struct aead_alg *alg; | |
202 | unsigned int ivsize; | |
203 | unsigned int maxauthsize; | |
5b6d2d7f HX |
204 | int err; |
205 | ||
206 | algt = crypto_get_attr_type(tb); | |
5b6d2d7f | 207 | if (IS_ERR(algt)) |
3e8afe35 | 208 | return ERR_CAST(algt); |
5b6d2d7f | 209 | |
5e4b8c1f | 210 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
5b6d2d7f HX |
211 | return ERR_PTR(-EINVAL); |
212 | ||
213 | name = crypto_attr_alg_name(tb[1]); | |
5b6d2d7f | 214 | if (IS_ERR(name)) |
3e8afe35 | 215 | return ERR_CAST(name); |
5b6d2d7f HX |
216 | |
217 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
218 | if (!inst) | |
219 | return ERR_PTR(-ENOMEM); | |
220 | ||
856e3f40 | 221 | spawn = aead_instance_ctx(inst); |
5b6d2d7f HX |
222 | |
223 | /* Ignore async algorithms if necessary. */ | |
224 | mask |= crypto_requires_sync(algt->type, algt->mask); | |
225 | ||
856e3f40 | 226 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
b0d955ba | 227 | err = crypto_grab_aead(spawn, name, type, mask); |
5b6d2d7f HX |
228 | if (err) |
229 | goto err_free_inst; | |
230 | ||
856e3f40 HX |
231 | alg = crypto_spawn_aead_alg(spawn); |
232 | ||
30e4c010 HX |
233 | ivsize = crypto_aead_alg_ivsize(alg); |
234 | maxauthsize = crypto_aead_alg_maxauthsize(alg); | |
5b6d2d7f HX |
235 | |
236 | err = -EINVAL; | |
6350449f | 237 | if (ivsize < sizeof(u64)) |
5b6d2d7f HX |
238 | goto err_drop_alg; |
239 | ||
856e3f40 HX |
240 | err = -ENAMETOOLONG; |
241 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
242 | "%s(%s)", tmpl->name, alg->base.cra_name) >= | |
243 | CRYPTO_MAX_ALG_NAME) | |
244 | goto err_drop_alg; | |
245 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
246 | "%s(%s)", tmpl->name, alg->base.cra_driver_name) >= | |
247 | CRYPTO_MAX_ALG_NAME) | |
248 | goto err_drop_alg; | |
5b6d2d7f | 249 | |
5e4b8c1f | 250 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
856e3f40 HX |
251 | inst->alg.base.cra_priority = alg->base.cra_priority; |
252 | inst->alg.base.cra_blocksize = alg->base.cra_blocksize; | |
253 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
6350449f HX |
254 | inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx); |
255 | ||
256 | inst->alg.setkey = aead_geniv_setkey; | |
257 | inst->alg.setauthsize = aead_geniv_setauthsize; | |
5b6d2d7f | 258 | |
856e3f40 HX |
259 | inst->alg.ivsize = ivsize; |
260 | inst->alg.maxauthsize = maxauthsize; | |
5b6d2d7f HX |
261 | |
262 | out: | |
263 | return inst; | |
264 | ||
265 | err_drop_alg: | |
266 | crypto_drop_aead(spawn); | |
267 | err_free_inst: | |
268 | kfree(inst); | |
269 | inst = ERR_PTR(err); | |
270 | goto out; | |
271 | } | |
272 | EXPORT_SYMBOL_GPL(aead_geniv_alloc); | |
273 | ||
856e3f40 | 274 | void aead_geniv_free(struct aead_instance *inst) |
5b6d2d7f | 275 | { |
856e3f40 | 276 | crypto_drop_aead(aead_instance_ctx(inst)); |
5b6d2d7f HX |
277 | kfree(inst); |
278 | } | |
279 | EXPORT_SYMBOL_GPL(aead_geniv_free); | |
280 | ||
149a3971 HX |
281 | int aead_init_geniv(struct crypto_aead *aead) |
282 | { | |
283 | struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead); | |
284 | struct aead_instance *inst = aead_alg_instance(aead); | |
285 | struct crypto_aead *child; | |
286 | int err; | |
287 | ||
288 | spin_lock_init(&ctx->lock); | |
289 | ||
290 | err = crypto_get_default_rng(); | |
291 | if (err) | |
292 | goto out; | |
293 | ||
294 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, | |
295 | crypto_aead_ivsize(aead)); | |
296 | crypto_put_default_rng(); | |
297 | if (err) | |
298 | goto out; | |
299 | ||
3a2d4fb5 | 300 | ctx->sknull = crypto_get_default_null_skcipher(); |
ca0494c0 HX |
301 | err = PTR_ERR(ctx->sknull); |
302 | if (IS_ERR(ctx->sknull)) | |
303 | goto out; | |
304 | ||
149a3971 HX |
305 | child = crypto_spawn_aead(aead_instance_ctx(inst)); |
306 | err = PTR_ERR(child); | |
307 | if (IS_ERR(child)) | |
308 | goto drop_null; | |
309 | ||
310 | ctx->child = child; | |
311 | crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) + | |
312 | sizeof(struct aead_request)); | |
313 | ||
314 | err = 0; | |
315 | ||
316 | out: | |
317 | return err; | |
318 | ||
319 | drop_null: | |
3a2d4fb5 | 320 | crypto_put_default_null_skcipher(); |
149a3971 HX |
321 | goto out; |
322 | } | |
323 | EXPORT_SYMBOL_GPL(aead_init_geniv); | |
324 | ||
325 | void aead_exit_geniv(struct crypto_aead *tfm) | |
326 | { | |
327 | struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm); | |
328 | ||
329 | crypto_free_aead(ctx->child); | |
3a2d4fb5 | 330 | crypto_put_default_null_skcipher(); |
149a3971 HX |
331 | } |
332 | EXPORT_SYMBOL_GPL(aead_exit_geniv); | |
333 | ||
d29ce988 HX |
334 | int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name, |
335 | u32 type, u32 mask) | |
336 | { | |
5d1d65f8 HX |
337 | spawn->base.frontend = &crypto_aead_type; |
338 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
d29ce988 HX |
339 | } |
340 | EXPORT_SYMBOL_GPL(crypto_grab_aead); | |
341 | ||
342 | struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask) | |
343 | { | |
5d1d65f8 | 344 | return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask); |
d29ce988 HX |
345 | } |
346 | EXPORT_SYMBOL_GPL(crypto_alloc_aead); | |
347 | ||
63293c61 HX |
348 | static int aead_prepare_alg(struct aead_alg *alg) |
349 | { | |
350 | struct crypto_alg *base = &alg->base; | |
351 | ||
7a530aa9 HX |
352 | if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) > |
353 | PAGE_SIZE / 8) | |
63293c61 HX |
354 | return -EINVAL; |
355 | ||
7a530aa9 HX |
356 | if (!alg->chunksize) |
357 | alg->chunksize = base->cra_blocksize; | |
358 | ||
b0d955ba | 359 | base->cra_type = &crypto_aead_type; |
63293c61 HX |
360 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
361 | base->cra_flags |= CRYPTO_ALG_TYPE_AEAD; | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | int crypto_register_aead(struct aead_alg *alg) | |
367 | { | |
368 | struct crypto_alg *base = &alg->base; | |
369 | int err; | |
370 | ||
371 | err = aead_prepare_alg(alg); | |
372 | if (err) | |
373 | return err; | |
374 | ||
375 | return crypto_register_alg(base); | |
376 | } | |
377 | EXPORT_SYMBOL_GPL(crypto_register_aead); | |
378 | ||
43615369 | 379 | void crypto_unregister_aead(struct aead_alg *alg) |
63293c61 | 380 | { |
43615369 | 381 | crypto_unregister_alg(&alg->base); |
63293c61 HX |
382 | } |
383 | EXPORT_SYMBOL_GPL(crypto_unregister_aead); | |
384 | ||
caab9461 HX |
385 | int crypto_register_aeads(struct aead_alg *algs, int count) |
386 | { | |
387 | int i, ret; | |
388 | ||
389 | for (i = 0; i < count; i++) { | |
390 | ret = crypto_register_aead(&algs[i]); | |
391 | if (ret) | |
392 | goto err; | |
393 | } | |
394 | ||
395 | return 0; | |
396 | ||
397 | err: | |
398 | for (--i; i >= 0; --i) | |
399 | crypto_unregister_aead(&algs[i]); | |
400 | ||
401 | return ret; | |
402 | } | |
403 | EXPORT_SYMBOL_GPL(crypto_register_aeads); | |
404 | ||
405 | void crypto_unregister_aeads(struct aead_alg *algs, int count) | |
406 | { | |
407 | int i; | |
408 | ||
409 | for (i = count - 1; i >= 0; --i) | |
410 | crypto_unregister_aead(&algs[i]); | |
411 | } | |
412 | EXPORT_SYMBOL_GPL(crypto_unregister_aeads); | |
413 | ||
63293c61 HX |
414 | int aead_register_instance(struct crypto_template *tmpl, |
415 | struct aead_instance *inst) | |
416 | { | |
417 | int err; | |
418 | ||
419 | err = aead_prepare_alg(&inst->alg); | |
420 | if (err) | |
421 | return err; | |
422 | ||
423 | return crypto_register_instance(tmpl, aead_crypto_instance(inst)); | |
424 | } | |
425 | EXPORT_SYMBOL_GPL(aead_register_instance); | |
426 | ||
1ae97820 HX |
427 | MODULE_LICENSE("GPL"); |
428 | MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)"); |