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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/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)");