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