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