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Commit | Line | Data |
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1ae97820 HX |
1 | /* |
2 | * AEAD: Authenticated Encryption with Associated Data | |
3922538f | 3 | * |
1ae97820 HX |
4 | * This file provides API support for AEAD algorithms. |
5 | * | |
b0d955ba | 6 | * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au> |
1ae97820 HX |
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 | ||
6350449f | 15 | #include <crypto/internal/geniv.h> |
149a3971 HX |
16 | #include <crypto/internal/rng.h> |
17 | #include <crypto/null.h> | |
996d98d8 | 18 | #include <crypto/scatterwalk.h> |
5b6d2d7f | 19 | #include <linux/err.h> |
1ae97820 HX |
20 | #include <linux/init.h> |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
d29ce988 | 23 | #include <linux/rtnetlink.h> |
1ae97820 HX |
24 | #include <linux/slab.h> |
25 | #include <linux/seq_file.h> | |
6ad414fe | 26 | #include <linux/cryptouser.h> |
d8c34b94 | 27 | #include <linux/compiler.h> |
6ad414fe | 28 | #include <net/netlink.h> |
1ae97820 | 29 | |
5b6d2d7f HX |
30 | #include "internal.h" |
31 | ||
1ae97820 HX |
32 | static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key, |
33 | unsigned int keylen) | |
34 | { | |
1ae97820 HX |
35 | unsigned long alignmask = crypto_aead_alignmask(tfm); |
36 | int ret; | |
37 | u8 *buffer, *alignbuffer; | |
38 | unsigned long absize; | |
39 | ||
40 | absize = keylen + alignmask; | |
41 | buffer = kmalloc(absize, GFP_ATOMIC); | |
42 | if (!buffer) | |
43 | return -ENOMEM; | |
44 | ||
45 | alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); | |
46 | memcpy(alignbuffer, key, keylen); | |
b0d955ba | 47 | ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen); |
1ae97820 HX |
48 | memset(alignbuffer, 0, keylen); |
49 | kfree(buffer); | |
50 | return ret; | |
51 | } | |
52 | ||
5d1d65f8 HX |
53 | int crypto_aead_setkey(struct crypto_aead *tfm, |
54 | const u8 *key, unsigned int keylen) | |
1ae97820 | 55 | { |
1ae97820 | 56 | unsigned long alignmask = crypto_aead_alignmask(tfm); |
dc26c17f | 57 | int err; |
1ae97820 HX |
58 | |
59 | if ((unsigned long)key & alignmask) | |
dc26c17f EB |
60 | err = setkey_unaligned(tfm, key, keylen); |
61 | else | |
62 | err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen); | |
63 | ||
6717054d EB |
64 | if (unlikely(err)) { |
65 | crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY); | |
dc26c17f | 66 | return err; |
6717054d | 67 | } |
1ae97820 | 68 | |
dc26c17f EB |
69 | crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY); |
70 | return 0; | |
1ae97820 | 71 | } |
5d1d65f8 | 72 | EXPORT_SYMBOL_GPL(crypto_aead_setkey); |
1ae97820 | 73 | |
7ba683a6 HX |
74 | int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize) |
75 | { | |
76 | int err; | |
77 | ||
30e4c010 | 78 | if (authsize > crypto_aead_maxauthsize(tfm)) |
7ba683a6 HX |
79 | return -EINVAL; |
80 | ||
b0d955ba HX |
81 | if (crypto_aead_alg(tfm)->setauthsize) { |
82 | err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize); | |
7ba683a6 HX |
83 | if (err) |
84 | return err; | |
85 | } | |
86 | ||
5d1d65f8 | 87 | tfm->authsize = authsize; |
7ba683a6 HX |
88 | return 0; |
89 | } | |
90 | EXPORT_SYMBOL_GPL(crypto_aead_setauthsize); | |
91 | ||
5eb8ec6d HX |
92 | static void crypto_aead_exit_tfm(struct crypto_tfm *tfm) |
93 | { | |
94 | struct crypto_aead *aead = __crypto_aead_cast(tfm); | |
95 | struct aead_alg *alg = crypto_aead_alg(aead); | |
96 | ||
97 | alg->exit(aead); | |
98 | } | |
99 | ||
63293c61 HX |
100 | static int crypto_aead_init_tfm(struct crypto_tfm *tfm) |
101 | { | |
102 | struct crypto_aead *aead = __crypto_aead_cast(tfm); | |
103 | struct aead_alg *alg = crypto_aead_alg(aead); | |
104 | ||
dc26c17f EB |
105 | crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY); |
106 | ||
63293c61 HX |
107 | aead->authsize = alg->maxauthsize; |
108 | ||
5eb8ec6d HX |
109 | if (alg->exit) |
110 | aead->base.exit = crypto_aead_exit_tfm; | |
111 | ||
112 | if (alg->init) | |
113 | return alg->init(aead); | |
114 | ||
63293c61 HX |
115 | return 0; |
116 | } | |
117 | ||
63293c61 HX |
118 | #ifdef CONFIG_NET |
119 | static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
120 | { | |
121 | struct crypto_report_aead raead; | |
122 | struct aead_alg *aead = container_of(alg, struct aead_alg, base); | |
123 | ||
37db69e0 EB |
124 | memset(&raead, 0, sizeof(raead)); |
125 | ||
126 | strscpy(raead.type, "aead", sizeof(raead.type)); | |
127 | strscpy(raead.geniv, "<none>", sizeof(raead.geniv)); | |
63293c61 HX |
128 | |
129 | raead.blocksize = alg->cra_blocksize; | |
130 | raead.maxauthsize = aead->maxauthsize; | |
131 | raead.ivsize = aead->ivsize; | |
132 | ||
37db69e0 | 133 | return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead); |
63293c61 HX |
134 | } |
135 | #else | |
136 | static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg) | |
137 | { | |
138 | return -ENOSYS; | |
139 | } | |
140 | #endif | |
141 | ||
142 | static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) | |
d8c34b94 | 143 | __maybe_unused; |
63293c61 HX |
144 | static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg) |
145 | { | |
146 | struct aead_alg *aead = container_of(alg, struct aead_alg, base); | |
147 | ||
148 | seq_printf(m, "type : aead\n"); | |
149 | seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? | |
150 | "yes" : "no"); | |
151 | seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); | |
152 | seq_printf(m, "ivsize : %u\n", aead->ivsize); | |
153 | seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize); | |
154 | seq_printf(m, "geniv : <none>\n"); | |
155 | } | |
156 | ||
ba75e15f HX |
157 | static void crypto_aead_free_instance(struct crypto_instance *inst) |
158 | { | |
159 | struct aead_instance *aead = aead_instance(inst); | |
160 | ||
161 | if (!aead->free) { | |
162 | inst->tmpl->free(inst); | |
163 | return; | |
164 | } | |
165 | ||
166 | aead->free(aead); | |
167 | } | |
168 | ||
b0d955ba | 169 | static const struct crypto_type crypto_aead_type = { |
63293c61 HX |
170 | .extsize = crypto_alg_extsize, |
171 | .init_tfm = crypto_aead_init_tfm, | |
ba75e15f | 172 | .free = crypto_aead_free_instance, |
63293c61 HX |
173 | #ifdef CONFIG_PROC_FS |
174 | .show = crypto_aead_show, | |
175 | #endif | |
176 | .report = crypto_aead_report, | |
177 | .maskclear = ~CRYPTO_ALG_TYPE_MASK, | |
178 | .maskset = CRYPTO_ALG_TYPE_MASK, | |
179 | .type = CRYPTO_ALG_TYPE_AEAD, | |
180 | .tfmsize = offsetof(struct crypto_aead, base), | |
181 | }; | |
182 | ||
6350449f HX |
183 | static int aead_geniv_setkey(struct crypto_aead *tfm, |
184 | const u8 *key, unsigned int keylen) | |
185 | { | |
186 | struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm); | |
187 | ||
188 | return crypto_aead_setkey(ctx->child, key, keylen); | |
189 | } | |
190 | ||
191 | static int aead_geniv_setauthsize(struct crypto_aead *tfm, | |
192 | unsigned int authsize) | |
193 | { | |
194 | struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm); | |
195 | ||
196 | return crypto_aead_setauthsize(ctx->child, authsize); | |
197 | } | |
198 | ||
856e3f40 HX |
199 | struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl, |
200 | struct rtattr **tb, u32 type, u32 mask) | |
5b6d2d7f HX |
201 | { |
202 | const char *name; | |
203 | struct crypto_aead_spawn *spawn; | |
204 | struct crypto_attr_type *algt; | |
856e3f40 HX |
205 | struct aead_instance *inst; |
206 | struct aead_alg *alg; | |
207 | unsigned int ivsize; | |
208 | unsigned int maxauthsize; | |
5b6d2d7f HX |
209 | int err; |
210 | ||
211 | algt = crypto_get_attr_type(tb); | |
5b6d2d7f | 212 | if (IS_ERR(algt)) |
3e8afe35 | 213 | return ERR_CAST(algt); |
5b6d2d7f | 214 | |
5e4b8c1f | 215 | if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
5b6d2d7f HX |
216 | return ERR_PTR(-EINVAL); |
217 | ||
218 | name = crypto_attr_alg_name(tb[1]); | |
5b6d2d7f | 219 | if (IS_ERR(name)) |
3e8afe35 | 220 | return ERR_CAST(name); |
5b6d2d7f HX |
221 | |
222 | inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); | |
223 | if (!inst) | |
224 | return ERR_PTR(-ENOMEM); | |
225 | ||
856e3f40 | 226 | spawn = aead_instance_ctx(inst); |
5b6d2d7f HX |
227 | |
228 | /* Ignore async algorithms if necessary. */ | |
229 | mask |= crypto_requires_sync(algt->type, algt->mask); | |
230 | ||
856e3f40 | 231 | crypto_set_aead_spawn(spawn, aead_crypto_instance(inst)); |
b0d955ba | 232 | err = crypto_grab_aead(spawn, name, type, mask); |
5b6d2d7f HX |
233 | if (err) |
234 | goto err_free_inst; | |
235 | ||
856e3f40 HX |
236 | alg = crypto_spawn_aead_alg(spawn); |
237 | ||
30e4c010 HX |
238 | ivsize = crypto_aead_alg_ivsize(alg); |
239 | maxauthsize = crypto_aead_alg_maxauthsize(alg); | |
5b6d2d7f HX |
240 | |
241 | err = -EINVAL; | |
6350449f | 242 | if (ivsize < sizeof(u64)) |
5b6d2d7f HX |
243 | goto err_drop_alg; |
244 | ||
856e3f40 HX |
245 | err = -ENAMETOOLONG; |
246 | if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, | |
247 | "%s(%s)", tmpl->name, alg->base.cra_name) >= | |
248 | CRYPTO_MAX_ALG_NAME) | |
249 | goto err_drop_alg; | |
250 | if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, | |
251 | "%s(%s)", tmpl->name, alg->base.cra_driver_name) >= | |
252 | CRYPTO_MAX_ALG_NAME) | |
253 | goto err_drop_alg; | |
5b6d2d7f | 254 | |
5e4b8c1f | 255 | inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC; |
856e3f40 HX |
256 | inst->alg.base.cra_priority = alg->base.cra_priority; |
257 | inst->alg.base.cra_blocksize = alg->base.cra_blocksize; | |
258 | inst->alg.base.cra_alignmask = alg->base.cra_alignmask; | |
6350449f HX |
259 | inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx); |
260 | ||
261 | inst->alg.setkey = aead_geniv_setkey; | |
262 | inst->alg.setauthsize = aead_geniv_setauthsize; | |
5b6d2d7f | 263 | |
856e3f40 HX |
264 | inst->alg.ivsize = ivsize; |
265 | inst->alg.maxauthsize = maxauthsize; | |
5b6d2d7f HX |
266 | |
267 | out: | |
268 | return inst; | |
269 | ||
270 | err_drop_alg: | |
271 | crypto_drop_aead(spawn); | |
272 | err_free_inst: | |
273 | kfree(inst); | |
274 | inst = ERR_PTR(err); | |
275 | goto out; | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(aead_geniv_alloc); | |
278 | ||
856e3f40 | 279 | void aead_geniv_free(struct aead_instance *inst) |
5b6d2d7f | 280 | { |
856e3f40 | 281 | crypto_drop_aead(aead_instance_ctx(inst)); |
5b6d2d7f HX |
282 | kfree(inst); |
283 | } | |
284 | EXPORT_SYMBOL_GPL(aead_geniv_free); | |
285 | ||
149a3971 HX |
286 | int aead_init_geniv(struct crypto_aead *aead) |
287 | { | |
288 | struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead); | |
289 | struct aead_instance *inst = aead_alg_instance(aead); | |
290 | struct crypto_aead *child; | |
291 | int err; | |
292 | ||
293 | spin_lock_init(&ctx->lock); | |
294 | ||
295 | err = crypto_get_default_rng(); | |
296 | if (err) | |
297 | goto out; | |
298 | ||
299 | err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt, | |
300 | crypto_aead_ivsize(aead)); | |
301 | crypto_put_default_rng(); | |
302 | if (err) | |
303 | goto out; | |
304 | ||
3a2d4fb5 | 305 | ctx->sknull = crypto_get_default_null_skcipher(); |
ca0494c0 HX |
306 | err = PTR_ERR(ctx->sknull); |
307 | if (IS_ERR(ctx->sknull)) | |
308 | goto out; | |
309 | ||
149a3971 HX |
310 | child = crypto_spawn_aead(aead_instance_ctx(inst)); |
311 | err = PTR_ERR(child); | |
312 | if (IS_ERR(child)) | |
313 | goto drop_null; | |
314 | ||
315 | ctx->child = child; | |
316 | crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) + | |
317 | sizeof(struct aead_request)); | |
318 | ||
319 | err = 0; | |
320 | ||
321 | out: | |
322 | return err; | |
323 | ||
324 | drop_null: | |
3a2d4fb5 | 325 | crypto_put_default_null_skcipher(); |
149a3971 HX |
326 | goto out; |
327 | } | |
328 | EXPORT_SYMBOL_GPL(aead_init_geniv); | |
329 | ||
330 | void aead_exit_geniv(struct crypto_aead *tfm) | |
331 | { | |
332 | struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm); | |
333 | ||
334 | crypto_free_aead(ctx->child); | |
3a2d4fb5 | 335 | crypto_put_default_null_skcipher(); |
149a3971 HX |
336 | } |
337 | EXPORT_SYMBOL_GPL(aead_exit_geniv); | |
338 | ||
d29ce988 HX |
339 | int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name, |
340 | u32 type, u32 mask) | |
341 | { | |
5d1d65f8 HX |
342 | spawn->base.frontend = &crypto_aead_type; |
343 | return crypto_grab_spawn(&spawn->base, name, type, mask); | |
d29ce988 HX |
344 | } |
345 | EXPORT_SYMBOL_GPL(crypto_grab_aead); | |
346 | ||
347 | struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask) | |
348 | { | |
5d1d65f8 | 349 | return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask); |
d29ce988 HX |
350 | } |
351 | EXPORT_SYMBOL_GPL(crypto_alloc_aead); | |
352 | ||
63293c61 HX |
353 | static int aead_prepare_alg(struct aead_alg *alg) |
354 | { | |
355 | struct crypto_alg *base = &alg->base; | |
356 | ||
7a530aa9 HX |
357 | if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) > |
358 | PAGE_SIZE / 8) | |
63293c61 HX |
359 | return -EINVAL; |
360 | ||
7a530aa9 HX |
361 | if (!alg->chunksize) |
362 | alg->chunksize = base->cra_blocksize; | |
363 | ||
b0d955ba | 364 | base->cra_type = &crypto_aead_type; |
63293c61 HX |
365 | base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; |
366 | base->cra_flags |= CRYPTO_ALG_TYPE_AEAD; | |
367 | ||
368 | return 0; | |
369 | } | |
370 | ||
371 | int crypto_register_aead(struct aead_alg *alg) | |
372 | { | |
373 | struct crypto_alg *base = &alg->base; | |
374 | int err; | |
375 | ||
376 | err = aead_prepare_alg(alg); | |
377 | if (err) | |
378 | return err; | |
379 | ||
380 | return crypto_register_alg(base); | |
381 | } | |
382 | EXPORT_SYMBOL_GPL(crypto_register_aead); | |
383 | ||
43615369 | 384 | void crypto_unregister_aead(struct aead_alg *alg) |
63293c61 | 385 | { |
43615369 | 386 | crypto_unregister_alg(&alg->base); |
63293c61 HX |
387 | } |
388 | EXPORT_SYMBOL_GPL(crypto_unregister_aead); | |
389 | ||
caab9461 HX |
390 | int crypto_register_aeads(struct aead_alg *algs, int count) |
391 | { | |
392 | int i, ret; | |
393 | ||
394 | for (i = 0; i < count; i++) { | |
395 | ret = crypto_register_aead(&algs[i]); | |
396 | if (ret) | |
397 | goto err; | |
398 | } | |
399 | ||
400 | return 0; | |
401 | ||
402 | err: | |
403 | for (--i; i >= 0; --i) | |
404 | crypto_unregister_aead(&algs[i]); | |
405 | ||
406 | return ret; | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(crypto_register_aeads); | |
409 | ||
410 | void crypto_unregister_aeads(struct aead_alg *algs, int count) | |
411 | { | |
412 | int i; | |
413 | ||
414 | for (i = count - 1; i >= 0; --i) | |
415 | crypto_unregister_aead(&algs[i]); | |
416 | } | |
417 | EXPORT_SYMBOL_GPL(crypto_unregister_aeads); | |
418 | ||
63293c61 HX |
419 | int aead_register_instance(struct crypto_template *tmpl, |
420 | struct aead_instance *inst) | |
421 | { | |
422 | int err; | |
423 | ||
424 | err = aead_prepare_alg(&inst->alg); | |
425 | if (err) | |
426 | return err; | |
427 | ||
428 | return crypto_register_instance(tmpl, aead_crypto_instance(inst)); | |
429 | } | |
430 | EXPORT_SYMBOL_GPL(aead_register_instance); | |
431 | ||
1ae97820 HX |
432 | MODULE_LICENSE("GPL"); |
433 | MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)"); |