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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)");
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/geniv.h>
11#include <crypto/internal/rng.h>
12#include <crypto/null.h>
13#include <crypto/scatterwalk.h>
14#include <linux/err.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/rtnetlink.h>
19#include <linux/slab.h>
20#include <linux/seq_file.h>
21#include <linux/cryptouser.h>
22#include <linux/compiler.h>
23#include <net/netlink.h>
24
25#include "internal.h"
26
27static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
28 unsigned int keylen)
29{
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);
42 ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
43 memset(alignbuffer, 0, keylen);
44 kfree(buffer);
45 return ret;
46}
47
48int crypto_aead_setkey(struct crypto_aead *tfm,
49 const u8 *key, unsigned int keylen)
50{
51 unsigned long alignmask = crypto_aead_alignmask(tfm);
52 int err;
53
54 if ((unsigned long)key & alignmask)
55 err = setkey_unaligned(tfm, key, keylen);
56 else
57 err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
58
59 if (unlikely(err)) {
60 crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
61 return err;
62 }
63
64 crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
65 return 0;
66}
67EXPORT_SYMBOL_GPL(crypto_aead_setkey);
68
69int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
70{
71 int err;
72
73 if ((!authsize && crypto_aead_maxauthsize(tfm)) ||
74 authsize > crypto_aead_maxauthsize(tfm))
75 return -EINVAL;
76
77 if (crypto_aead_alg(tfm)->setauthsize) {
78 err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
79 if (err)
80 return err;
81 }
82
83 tfm->authsize = authsize;
84 return 0;
85}
86EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
87
88int crypto_aead_encrypt(struct aead_request *req)
89{
90 struct crypto_aead *aead = crypto_aead_reqtfm(req);
91 struct crypto_alg *alg = aead->base.__crt_alg;
92 unsigned int cryptlen = req->cryptlen;
93 int ret;
94
95 crypto_stats_get(alg);
96 if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
97 ret = -ENOKEY;
98 else
99 ret = crypto_aead_alg(aead)->encrypt(req);
100 crypto_stats_aead_encrypt(cryptlen, alg, ret);
101 return ret;
102}
103EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
104
105int crypto_aead_decrypt(struct aead_request *req)
106{
107 struct crypto_aead *aead = crypto_aead_reqtfm(req);
108 struct crypto_alg *alg = aead->base.__crt_alg;
109 unsigned int cryptlen = req->cryptlen;
110 int ret;
111
112 crypto_stats_get(alg);
113 if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
114 ret = -ENOKEY;
115 else if (req->cryptlen < crypto_aead_authsize(aead))
116 ret = -EINVAL;
117 else
118 ret = crypto_aead_alg(aead)->decrypt(req);
119 crypto_stats_aead_decrypt(cryptlen, alg, ret);
120 return ret;
121}
122EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
123
124static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
125{
126 struct crypto_aead *aead = __crypto_aead_cast(tfm);
127 struct aead_alg *alg = crypto_aead_alg(aead);
128
129 alg->exit(aead);
130}
131
132static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
133{
134 struct crypto_aead *aead = __crypto_aead_cast(tfm);
135 struct aead_alg *alg = crypto_aead_alg(aead);
136
137 crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
138
139 aead->authsize = alg->maxauthsize;
140
141 if (alg->exit)
142 aead->base.exit = crypto_aead_exit_tfm;
143
144 if (alg->init)
145 return alg->init(aead);
146
147 return 0;
148}
149
150#ifdef CONFIG_NET
151static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
152{
153 struct crypto_report_aead raead;
154 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
155
156 memset(&raead, 0, sizeof(raead));
157
158 strscpy(raead.type, "aead", sizeof(raead.type));
159 strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
160
161 raead.blocksize = alg->cra_blocksize;
162 raead.maxauthsize = aead->maxauthsize;
163 raead.ivsize = aead->ivsize;
164
165 return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
166}
167#else
168static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
169{
170 return -ENOSYS;
171}
172#endif
173
174static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
175 __maybe_unused;
176static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
177{
178 struct aead_alg *aead = container_of(alg, struct aead_alg, base);
179
180 seq_printf(m, "type : aead\n");
181 seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
182 "yes" : "no");
183 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
184 seq_printf(m, "ivsize : %u\n", aead->ivsize);
185 seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
186 seq_printf(m, "geniv : <none>\n");
187}
188
189static void crypto_aead_free_instance(struct crypto_instance *inst)
190{
191 struct aead_instance *aead = aead_instance(inst);
192
193 if (!aead->free) {
194 inst->tmpl->free(inst);
195 return;
196 }
197
198 aead->free(aead);
199}
200
201static const struct crypto_type crypto_aead_type = {
202 .extsize = crypto_alg_extsize,
203 .init_tfm = crypto_aead_init_tfm,
204 .free = crypto_aead_free_instance,
205#ifdef CONFIG_PROC_FS
206 .show = crypto_aead_show,
207#endif
208 .report = crypto_aead_report,
209 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
210 .maskset = CRYPTO_ALG_TYPE_MASK,
211 .type = CRYPTO_ALG_TYPE_AEAD,
212 .tfmsize = offsetof(struct crypto_aead, base),
213};
214
215static int aead_geniv_setkey(struct crypto_aead *tfm,
216 const u8 *key, unsigned int keylen)
217{
218 struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
219
220 return crypto_aead_setkey(ctx->child, key, keylen);
221}
222
223static int aead_geniv_setauthsize(struct crypto_aead *tfm,
224 unsigned int authsize)
225{
226 struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
227
228 return crypto_aead_setauthsize(ctx->child, authsize);
229}
230
231struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
232 struct rtattr **tb, u32 type, u32 mask)
233{
234 const char *name;
235 struct crypto_aead_spawn *spawn;
236 struct crypto_attr_type *algt;
237 struct aead_instance *inst;
238 struct aead_alg *alg;
239 unsigned int ivsize;
240 unsigned int maxauthsize;
241 int err;
242
243 algt = crypto_get_attr_type(tb);
244 if (IS_ERR(algt))
245 return ERR_CAST(algt);
246
247 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
248 return ERR_PTR(-EINVAL);
249
250 name = crypto_attr_alg_name(tb[1]);
251 if (IS_ERR(name))
252 return ERR_CAST(name);
253
254 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
255 if (!inst)
256 return ERR_PTR(-ENOMEM);
257
258 spawn = aead_instance_ctx(inst);
259
260 /* Ignore async algorithms if necessary. */
261 mask |= crypto_requires_sync(algt->type, algt->mask);
262
263 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
264 err = crypto_grab_aead(spawn, name, type, mask);
265 if (err)
266 goto err_free_inst;
267
268 alg = crypto_spawn_aead_alg(spawn);
269
270 ivsize = crypto_aead_alg_ivsize(alg);
271 maxauthsize = crypto_aead_alg_maxauthsize(alg);
272
273 err = -EINVAL;
274 if (ivsize < sizeof(u64))
275 goto err_drop_alg;
276
277 err = -ENAMETOOLONG;
278 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
279 "%s(%s)", tmpl->name, alg->base.cra_name) >=
280 CRYPTO_MAX_ALG_NAME)
281 goto err_drop_alg;
282 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
283 "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
284 CRYPTO_MAX_ALG_NAME)
285 goto err_drop_alg;
286
287 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
288 inst->alg.base.cra_priority = alg->base.cra_priority;
289 inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
290 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
291 inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
292
293 inst->alg.setkey = aead_geniv_setkey;
294 inst->alg.setauthsize = aead_geniv_setauthsize;
295
296 inst->alg.ivsize = ivsize;
297 inst->alg.maxauthsize = maxauthsize;
298
299out:
300 return inst;
301
302err_drop_alg:
303 crypto_drop_aead(spawn);
304err_free_inst:
305 kfree(inst);
306 inst = ERR_PTR(err);
307 goto out;
308}
309EXPORT_SYMBOL_GPL(aead_geniv_alloc);
310
311void aead_geniv_free(struct aead_instance *inst)
312{
313 crypto_drop_aead(aead_instance_ctx(inst));
314 kfree(inst);
315}
316EXPORT_SYMBOL_GPL(aead_geniv_free);
317
318int aead_init_geniv(struct crypto_aead *aead)
319{
320 struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
321 struct aead_instance *inst = aead_alg_instance(aead);
322 struct crypto_aead *child;
323 int err;
324
325 spin_lock_init(&ctx->lock);
326
327 err = crypto_get_default_rng();
328 if (err)
329 goto out;
330
331 err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
332 crypto_aead_ivsize(aead));
333 crypto_put_default_rng();
334 if (err)
335 goto out;
336
337 ctx->sknull = crypto_get_default_null_skcipher();
338 err = PTR_ERR(ctx->sknull);
339 if (IS_ERR(ctx->sknull))
340 goto out;
341
342 child = crypto_spawn_aead(aead_instance_ctx(inst));
343 err = PTR_ERR(child);
344 if (IS_ERR(child))
345 goto drop_null;
346
347 ctx->child = child;
348 crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
349 sizeof(struct aead_request));
350
351 err = 0;
352
353out:
354 return err;
355
356drop_null:
357 crypto_put_default_null_skcipher();
358 goto out;
359}
360EXPORT_SYMBOL_GPL(aead_init_geniv);
361
362void aead_exit_geniv(struct crypto_aead *tfm)
363{
364 struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
365
366 crypto_free_aead(ctx->child);
367 crypto_put_default_null_skcipher();
368}
369EXPORT_SYMBOL_GPL(aead_exit_geniv);
370
371int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
372 u32 type, u32 mask)
373{
374 spawn->base.frontend = &crypto_aead_type;
375 return crypto_grab_spawn(&spawn->base, name, type, mask);
376}
377EXPORT_SYMBOL_GPL(crypto_grab_aead);
378
379struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
380{
381 return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
382}
383EXPORT_SYMBOL_GPL(crypto_alloc_aead);
384
385static int aead_prepare_alg(struct aead_alg *alg)
386{
387 struct crypto_alg *base = &alg->base;
388
389 if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
390 PAGE_SIZE / 8)
391 return -EINVAL;
392
393 if (!alg->chunksize)
394 alg->chunksize = base->cra_blocksize;
395
396 base->cra_type = &crypto_aead_type;
397 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
398 base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;
399
400 return 0;
401}
402
403int crypto_register_aead(struct aead_alg *alg)
404{
405 struct crypto_alg *base = &alg->base;
406 int err;
407
408 err = aead_prepare_alg(alg);
409 if (err)
410 return err;
411
412 return crypto_register_alg(base);
413}
414EXPORT_SYMBOL_GPL(crypto_register_aead);
415
416void crypto_unregister_aead(struct aead_alg *alg)
417{
418 crypto_unregister_alg(&alg->base);
419}
420EXPORT_SYMBOL_GPL(crypto_unregister_aead);
421
422int crypto_register_aeads(struct aead_alg *algs, int count)
423{
424 int i, ret;
425
426 for (i = 0; i < count; i++) {
427 ret = crypto_register_aead(&algs[i]);
428 if (ret)
429 goto err;
430 }
431
432 return 0;
433
434err:
435 for (--i; i >= 0; --i)
436 crypto_unregister_aead(&algs[i]);
437
438 return ret;
439}
440EXPORT_SYMBOL_GPL(crypto_register_aeads);
441
442void crypto_unregister_aeads(struct aead_alg *algs, int count)
443{
444 int i;
445
446 for (i = count - 1; i >= 0; --i)
447 crypto_unregister_aead(&algs[i]);
448}
449EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
450
451int aead_register_instance(struct crypto_template *tmpl,
452 struct aead_instance *inst)
453{
454 int err;
455
456 err = aead_prepare_alg(&inst->alg);
457 if (err)
458 return err;
459
460 return crypto_register_instance(tmpl, aead_crypto_instance(inst));
461}
462EXPORT_SYMBOL_GPL(aead_register_instance);
463
464MODULE_LICENSE("GPL");
465MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");