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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/cryptouser.h>
12#include <linux/errno.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/seq_file.h>
18#include <linux/string.h>
19#include <net/netlink.h>
20
21#include "internal.h"
22
23static inline struct crypto_istat_aead *aead_get_stat(struct aead_alg *alg)
24{
25#ifdef CONFIG_CRYPTO_STATS
26 return &alg->stat;
27#else
28 return NULL;
29#endif
30}
31
32static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
33 unsigned int keylen)
34{
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);
47 ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
48 memset(alignbuffer, 0, keylen);
49 kfree(buffer);
50 return ret;
51}
52
53int crypto_aead_setkey(struct crypto_aead *tfm,
54 const u8 *key, unsigned int keylen)
55{
56 unsigned long alignmask = crypto_aead_alignmask(tfm);
57 int err;
58
59 if ((unsigned long)key & alignmask)
60 err = setkey_unaligned(tfm, key, keylen);
61 else
62 err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
63
64 if (unlikely(err)) {
65 crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
66 return err;
67 }
68
69 crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
70 return 0;
71}
72EXPORT_SYMBOL_GPL(crypto_aead_setkey);
73
74int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
75{
76 int err;
77
78 if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
79 authsize > crypto_aead_maxauthsize(tfm))
80 return -EINVAL;
81
82 if (crypto_aead_alg(tfm)->setauthsize) {
83 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
84 if (err)
85 return err;
86 }
87
88 tfm->authsize = authsize;
89 return 0;
90}
91EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
92
93static inline int crypto_aead_errstat(struct crypto_istat_aead *istat, int err)
94{
95 if (!IS_ENABLED(CONFIG_CRYPTO_STATS))
96 return err;
97
98 if (err && err != -EINPROGRESS && err != -EBUSY)
99 atomic64_inc(&istat->err_cnt);
100
101 return err;
102}
103
104int crypto_aead_encrypt(struct aead_request *req)
105{
106 struct crypto_aead *aead = crypto_aead_reqtfm(req);
107 struct aead_alg *alg = crypto_aead_alg(aead);
108 struct crypto_istat_aead *istat;
109 int ret;
110
111 istat = aead_get_stat(alg);
112
113 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
114 atomic64_inc(&istat->encrypt_cnt);
115 atomic64_add(req->cryptlen, &istat->encrypt_tlen);
116 }
117
118 if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
119 ret = -ENOKEY;
120 else
121 ret = alg->encrypt(req);
122
123 return crypto_aead_errstat(istat, ret);
124}
125EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
126
127int crypto_aead_decrypt(struct aead_request *req)
128{
129 struct crypto_aead *aead = crypto_aead_reqtfm(req);
130 struct aead_alg *alg = crypto_aead_alg(aead);
131 struct crypto_istat_aead *istat;
132 int ret;
133
134 istat = aead_get_stat(alg);
135
136 if (IS_ENABLED(CONFIG_CRYPTO_STATS)) {
137 atomic64_inc(&istat->encrypt_cnt);
138 atomic64_add(req->cryptlen, &istat->encrypt_tlen);
139 }
140
141 if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
142 ret = -ENOKEY;
143 else if (req->cryptlen < crypto_aead_authsize(aead))
144 ret = -EINVAL;
145 else
146 ret = alg->decrypt(req);
147
148 return crypto_aead_errstat(istat, ret);
149}
150EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
151
152static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
153{
154 struct crypto_aead *aead = __crypto_aead_cast(tfm);
155 struct aead_alg *alg = crypto_aead_alg(aead);
156
157 alg->exit(aead);
158}
159
160static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
161{
162 struct crypto_aead *aead = __crypto_aead_cast(tfm);
163 struct aead_alg *alg = crypto_aead_alg(aead);
164
165 crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
166
167 aead->authsize = alg->maxauthsize;
168
169 if (alg->exit)
170 aead->base.exit = crypto_aead_exit_tfm;
171
172 if (alg->init)
173 return alg->init(aead);
174
175 return 0;
176}
177
178static int __maybe_unused crypto_aead_report(
179 struct sk_buff *skb, struct crypto_alg *alg)
180{
181 struct crypto_report_aead raead;
182 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
183
184 memset(&raead, 0, sizeof(raead));
185
186 strscpy(raead.type, "aead", sizeof(raead.type));
187 strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
188
189 raead.blocksize = alg->cra_blocksize;
190 raead.maxauthsize = aead->maxauthsize;
191 raead.ivsize = aead->ivsize;
192
193 return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
194}
195
196static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
197 __maybe_unused;
198static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
199{
200 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
201
202 seq_printf(m, "type : aead\n");
203 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
204 "yes" : "no");
205 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
206 seq_printf(m, "ivsize : %u\n", aead->ivsize);
207 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
208 seq_printf(m, "geniv : <none>\n");
209}
210
211static void crypto_aead_free_instance(struct crypto_instance *inst)
212{
213 struct aead_instance *aead = aead_instance(inst);
214
215 aead->free(aead);
216}
217
218static int __maybe_unused crypto_aead_report_stat(
219 struct sk_buff *skb, struct crypto_alg *alg)
220{
221 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
222 struct crypto_istat_aead *istat = aead_get_stat(aead);
223 struct crypto_stat_aead raead;
224
225 memset(&raead, 0, sizeof(raead));
226
227 strscpy(raead.type, "aead", sizeof(raead.type));
228
229 raead.stat_encrypt_cnt = atomic64_read(&istat->encrypt_cnt);
230 raead.stat_encrypt_tlen = atomic64_read(&istat->encrypt_tlen);
231 raead.stat_decrypt_cnt = atomic64_read(&istat->decrypt_cnt);
232 raead.stat_decrypt_tlen = atomic64_read(&istat->decrypt_tlen);
233 raead.stat_err_cnt = atomic64_read(&istat->err_cnt);
234
235 return nla_put(skb, CRYPTOCFGA_STAT_AEAD, sizeof(raead), &raead);
236}
237
238static const struct crypto_type crypto_aead_type = {
239 .extsize = crypto_alg_extsize,
240 .init_tfm = crypto_aead_init_tfm,
241 .free = crypto_aead_free_instance,
242#ifdef CONFIG_PROC_FS
243 .show = crypto_aead_show,
244#endif
245#if IS_ENABLED(CONFIG_CRYPTO_USER)
246 .report = crypto_aead_report,
247#endif
248#ifdef CONFIG_CRYPTO_STATS
249 .report_stat = crypto_aead_report_stat,
250#endif
251 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
252 .maskset = CRYPTO_ALG_TYPE_MASK,
253 .type = CRYPTO_ALG_TYPE_AEAD,
254 .tfmsize = offsetof(struct crypto_aead, base),
255};
256
257int crypto_grab_aead(struct crypto_aead_spawn *spawn,
258 struct crypto_instance *inst,
259 const char *name, u32 type, u32 mask)
260{
261 spawn->base.frontend = &crypto_aead_type;
262 return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
263}
264EXPORT_SYMBOL_GPL(crypto_grab_aead);
265
266struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
267{
268 return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
269}
270EXPORT_SYMBOL_GPL(crypto_alloc_aead);
271
272int crypto_has_aead(const char *alg_name, u32 type, u32 mask)
273{
274 return crypto_type_has_alg(alg_name, &crypto_aead_type, type, mask);
275}
276EXPORT_SYMBOL_GPL(crypto_has_aead);
277
278static int aead_prepare_alg(struct aead_alg *alg)
279{
280 struct crypto_istat_aead *istat = aead_get_stat(alg);
281 struct crypto_alg *base = &alg->base;
282
283 if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
284 PAGE_SIZE / 8)
285 return -EINVAL;
286
287 if (!alg->chunksize)
288 alg->chunksize = base->cra_blocksize;
289
290 base->cra_type = &crypto_aead_type;
291 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
292 base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
293
294 if (IS_ENABLED(CONFIG_CRYPTO_STATS))
295 memset(istat, 0, sizeof(*istat));
296
297 return 0;
298}
299
300int crypto_register_aead(struct aead_alg *alg)
301{
302 struct crypto_alg *base = &alg->base;
303 int err;
304
305 err = aead_prepare_alg(alg);
306 if (err)
307 return err;
308
309 return crypto_register_alg(base);
310}
311EXPORT_SYMBOL_GPL(crypto_register_aead);
312
313void crypto_unregister_aead(struct aead_alg *alg)
314{
315 crypto_unregister_alg(&alg->base);
316}
317EXPORT_SYMBOL_GPL(crypto_unregister_aead);
318
319int crypto_register_aeads(struct aead_alg *algs, int count)
320{
321 int i, ret;
322
323 for (i = 0; i < count; i++) {
324 ret = crypto_register_aead(&algs[i]);
325 if (ret)
326 goto err;
327 }
328
329 return 0;
330
331err:
332 for (--i; i >= 0; --i)
333 crypto_unregister_aead(&algs[i]);
334
335 return ret;
336}
337EXPORT_SYMBOL_GPL(crypto_register_aeads);
338
339void crypto_unregister_aeads(struct aead_alg *algs, int count)
340{
341 int i;
342
343 for (i = count - 1; i >= 0; --i)
344 crypto_unregister_aead(&algs[i]);
345}
346EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
347
348int aead_register_instance(struct crypto_template *tmpl,
349 struct aead_instance *inst)
350{
351 int err;
352
353 if (WARN_ON(!inst->free))
354 return -EINVAL;
355
356 err = aead_prepare_alg(&inst->alg);
357 if (err)
358 return err;
359
360 return crypto_register_instance(tmpl, aead_crypto_instance(inst));
361}
362EXPORT_SYMBOL_GPL(aead_register_instance);
363
364MODULE_LICENSE("GPL");
365MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");