[thirdparty/kernel/stable.git] / crypto / aead.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * AEAD: Authenticated Encryption with Associated Data
 *
 * This file provides API support for AEAD algorithms.
 *
 * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <crypto/internal/geniv.h>
#include <crypto/internal/rng.h>
#include <crypto/null.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/cryptouser.h>
#include <linux/compiler.h>
#include <net/netlink.h>

#include "internal.h"

static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,
			    unsigned int keylen)
{
	unsigned long alignmask = crypto_aead_alignmask(tfm);
	int ret;
	u8 *buffer, *alignbuffer;
	unsigned long absize;

	absize = keylen + alignmask;
	buffer = kmalloc(absize, GFP_ATOMIC);
	if (!buffer)
		return -ENOMEM;

	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	memcpy(alignbuffer, key, keylen);
	ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
	memset(alignbuffer, 0, keylen);
	kfree(buffer);
	return ret;
}

int crypto_aead_setkey(struct crypto_aead *tfm,
		       const u8 *key, unsigned int keylen)
{
	unsigned long alignmask = crypto_aead_alignmask(tfm);
	int err;

	if ((unsigned long)key & alignmask)
		err = setkey_unaligned(tfm, key, keylen);
	else
		err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);

	if (unlikely(err)) {
		crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
		return err;
	}

	crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_aead_setkey);

int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
{
	int err;

	if (authsize > crypto_aead_maxauthsize(tfm))
		return -EINVAL;

	if (crypto_aead_alg(tfm)->setauthsize) {
		err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
		if (err)
			return err;
	}

	tfm->authsize = authsize;
	return 0;
}
EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);

static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_aead *aead = __crypto_aead_cast(tfm);
	struct aead_alg *alg = crypto_aead_alg(aead);

	alg->exit(aead);
}

static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_aead *aead = __crypto_aead_cast(tfm);
	struct aead_alg *alg = crypto_aead_alg(aead);

	crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);

	aead->authsize = alg->maxauthsize;

	if (alg->exit)
		aead->base.exit = crypto_aead_exit_tfm;

	if (alg->init)
		return alg->init(aead);

	return 0;
}

#ifdef CONFIG_NET
static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_aead raead;
	struct aead_alg *aead = container_of(alg, struct aead_alg, base);

	memset(&raead, 0, sizeof(raead));

	strscpy(raead.type, "aead", sizeof(raead.type));
	strscpy(raead.geniv, "<none>", sizeof(raead.geniv));

	raead.blocksize = alg->cra_blocksize;
	raead.maxauthsize = aead->maxauthsize;
	raead.ivsize = aead->ivsize;

	return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
}
#else
static int crypto_aead_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
	__maybe_unused;
static void crypto_aead_show(struct seq_file *m, struct crypto_alg *alg)
{
	struct aead_alg *aead = container_of(alg, struct aead_alg, base);

	seq_printf(m, "type         : aead\n");
	seq_printf(m, "async        : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
					     "yes" : "no");
	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
	seq_printf(m, "ivsize       : %u\n", aead->ivsize);
	seq_printf(m, "maxauthsize  : %u\n", aead->maxauthsize);
	seq_printf(m, "geniv        : <none>\n");
}

static void crypto_aead_free_instance(struct crypto_instance *inst)
{
	struct aead_instance *aead = aead_instance(inst);

	if (!aead->free) {
		inst->tmpl->free(inst);
		return;
	}

	aead->free(aead);
}

static const struct crypto_type crypto_aead_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_aead_init_tfm,
	.free = crypto_aead_free_instance,
#ifdef CONFIG_PROC_FS
	.show = crypto_aead_show,
#endif
	.report = crypto_aead_report,
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_AEAD,
	.tfmsize = offsetof(struct crypto_aead, base),
};

static int aead_geniv_setkey(struct crypto_aead *tfm,
			     const u8 *key, unsigned int keylen)
{
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);

	return crypto_aead_setkey(ctx->child, key, keylen);
}

static int aead_geniv_setauthsize(struct crypto_aead *tfm,
				  unsigned int authsize)
{
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);

	return crypto_aead_setauthsize(ctx->child, authsize);
}

struct aead_instance *aead_geniv_alloc(struct crypto_template *tmpl,
				       struct rtattr **tb, u32 type, u32 mask)
{
	const char *name;
	struct crypto_aead_spawn *spawn;
	struct crypto_attr_type *algt;
	struct aead_instance *inst;
	struct aead_alg *alg;
	unsigned int ivsize;
	unsigned int maxauthsize;
	int err;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return ERR_CAST(algt);

	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
		return ERR_PTR(-EINVAL);

	name = crypto_attr_alg_name(tb[1]);
	if (IS_ERR(name))
		return ERR_CAST(name);

	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
	if (!inst)
		return ERR_PTR(-ENOMEM);

	spawn = aead_instance_ctx(inst);

	/* Ignore async algorithms if necessary. */
	mask |= crypto_requires_sync(algt->type, algt->mask);

	crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
	err = crypto_grab_aead(spawn, name, type, mask);
	if (err)
		goto err_free_inst;

	alg = crypto_spawn_aead_alg(spawn);

	ivsize = crypto_aead_alg_ivsize(alg);
	maxauthsize = crypto_aead_alg_maxauthsize(alg);

	err = -EINVAL;
	if (ivsize < sizeof(u64))
		goto err_drop_alg;

	err = -ENAMETOOLONG;
	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
		     "%s(%s)", tmpl->name, alg->base.cra_name) >=
	    CRYPTO_MAX_ALG_NAME)
		goto err_drop_alg;
	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
		     "%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
	    CRYPTO_MAX_ALG_NAME)
		goto err_drop_alg;

	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
	inst->alg.base.cra_priority = alg->base.cra_priority;
	inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
	inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);

	inst->alg.setkey = aead_geniv_setkey;
	inst->alg.setauthsize = aead_geniv_setauthsize;

	inst->alg.ivsize = ivsize;
	inst->alg.maxauthsize = maxauthsize;

out:
	return inst;

err_drop_alg:
	crypto_drop_aead(spawn);
err_free_inst:
	kfree(inst);
	inst = ERR_PTR(err);
	goto out;
}
EXPORT_SYMBOL_GPL(aead_geniv_alloc);

void aead_geniv_free(struct aead_instance *inst)
{
	crypto_drop_aead(aead_instance_ctx(inst));
	kfree(inst);
}
EXPORT_SYMBOL_GPL(aead_geniv_free);

int aead_init_geniv(struct crypto_aead *aead)
{
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
	struct aead_instance *inst = aead_alg_instance(aead);
	struct crypto_aead *child;
	int err;

	spin_lock_init(&ctx->lock);

	err = crypto_get_default_rng();
	if (err)
		goto out;

	err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
				   crypto_aead_ivsize(aead));
	crypto_put_default_rng();
	if (err)
		goto out;

	ctx->sknull = crypto_get_default_null_skcipher();
	err = PTR_ERR(ctx->sknull);
	if (IS_ERR(ctx->sknull))
		goto out;

	child = crypto_spawn_aead(aead_instance_ctx(inst));
	err = PTR_ERR(child);
	if (IS_ERR(child))
		goto drop_null;

	ctx->child = child;
	crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
				      sizeof(struct aead_request));

	err = 0;

out:
	return err;

drop_null:
	crypto_put_default_null_skcipher();
	goto out;
}
EXPORT_SYMBOL_GPL(aead_init_geniv);

void aead_exit_geniv(struct crypto_aead *tfm)
{
	struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);

	crypto_free_aead(ctx->child);
	crypto_put_default_null_skcipher();
}
EXPORT_SYMBOL_GPL(aead_exit_geniv);

int crypto_grab_aead(struct crypto_aead_spawn *spawn, const char *name,
		     u32 type, u32 mask)
{
	spawn->base.frontend = &crypto_aead_type;
	return crypto_grab_spawn(&spawn->base, name, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_grab_aead);

struct crypto_aead *crypto_alloc_aead(const char *alg_name, u32 type, u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_aead);

static int aead_prepare_alg(struct aead_alg *alg)
{
	struct crypto_alg *base = &alg->base;

	if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
	    PAGE_SIZE / 8)
		return -EINVAL;

	if (!alg->chunksize)
		alg->chunksize = base->cra_blocksize;

	base->cra_type = &crypto_aead_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_AEAD;

	return 0;
}

int crypto_register_aead(struct aead_alg *alg)
{
	struct crypto_alg *base = &alg->base;
	int err;

	err = aead_prepare_alg(alg);
	if (err)
		return err;

	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_aead);

void crypto_unregister_aead(struct aead_alg *alg)
{
	crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_aead);

int crypto_register_aeads(struct aead_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_register_aead(&algs[i]);
		if (ret)
			goto err;
	}

	return 0;

err:
	for (--i; i >= 0; --i)
		crypto_unregister_aead(&algs[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_aeads);

void crypto_unregister_aeads(struct aead_alg *algs, int count)
{
	int i;

	for (i = count - 1; i >= 0; --i)
		crypto_unregister_aead(&algs[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_aeads);

int aead_register_instance(struct crypto_template *tmpl,
			   struct aead_instance *inst)
{
	int err;

	err = aead_prepare_alg(&inst->alg);
	if (err)
		return err;

	return crypto_register_instance(tmpl, aead_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(aead_register_instance);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1ae97820 HX	2	/*
1ae97820 HX	3	* AEAD: Authenticated Encryption with Associated Data
3922538f	4	*
1ae97820 HX	5	* This file provides API support for AEAD algorithms.
1ae97820 HX	6	*
b0d955ba	7	* Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>
1ae97820 HX	8	*/
1ae97820 HX	9
6350449f	10	#include <crypto/internal/geniv.h>
149a3971 HX	11	#include <crypto/internal/rng.h>
149a3971 HX	12	#include <crypto/null.h>
996d98d8	13	#include <crypto/scatterwalk.h>
5b6d2d7f	14	#include <linux/err.h>
1ae97820 HX	15	#include <linux/init.h>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
d29ce988	18	#include <linux/rtnetlink.h>
1ae97820 HX	19	#include <linux/slab.h>
1ae97820 HX	20	#include <linux/seq_file.h>
6ad414fe	21	#include <linux/cryptouser.h>
d8c34b94	22	#include <linux/compiler.h>
6ad414fe	23	#include <net/netlink.h>
1ae97820	24
5b6d2d7f HX	25	#include "internal.h"
5b6d2d7f HX	26
1ae97820 HX	27	static int setkey_unaligned(struct crypto_aead tfm, const u8 key,
	28	unsigned int keylen)
	29	{
1ae97820 HX	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);
b0d955ba	42	ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
1ae97820 HX	43	memset(alignbuffer, 0, keylen);
	44	kfree(buffer);
	45	return ret;
	46	}
	47
5d1d65f8 HX	48	int crypto_aead_setkey(struct crypto_aead *tfm,
5d1d65f8 HX	49	const u8 *key, unsigned int keylen)
1ae97820	50	{
1ae97820	51	unsigned long alignmask = crypto_aead_alignmask(tfm);
dc26c17f	52	int err;
1ae97820 HX	53
1ae97820 HX	54	if ((unsigned long)key & alignmask)
dc26c17f EB	55	err = setkey_unaligned(tfm, key, keylen);
	56	else
	57	err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
	58
6ebc9700 EB	59	if (unlikely(err)) {
6ebc9700 EB	60	crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
dc26c17f	61	return err;
6ebc9700	62	}
1ae97820	63
dc26c17f EB	64	crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
dc26c17f EB	65	return 0;
1ae97820	66	}
5d1d65f8	67	EXPORT_SYMBOL_GPL(crypto_aead_setkey);
1ae97820	68
7ba683a6 HX	69	int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
	70	{
	71	int err;
	72
30e4c010	73	if (authsize > crypto_aead_maxauthsize(tfm))
7ba683a6 HX	74	return -EINVAL;
7ba683a6 HX	75
b0d955ba HX	76	if (crypto_aead_alg(tfm)->setauthsize) {
b0d955ba HX	77	err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
7ba683a6 HX	78	if (err)
	79	return err;
	80	}
	81
5d1d65f8	82	tfm->authsize = authsize;
7ba683a6 HX	83	return 0;
	84	}
	85	EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
	86
5eb8ec6d HX	87	static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
	88	{
	89	struct crypto_aead *aead = __crypto_aead_cast(tfm);
	90	struct aead_alg *alg = crypto_aead_alg(aead);
	91
	92	alg->exit(aead);
	93	}
	94
63293c61 HX	95	static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
	96	{
	97	struct crypto_aead *aead = __crypto_aead_cast(tfm);
	98	struct aead_alg *alg = crypto_aead_alg(aead);
	99
dc26c17f EB	100	crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
dc26c17f EB	101
63293c61 HX	102	aead->authsize = alg->maxauthsize;
63293c61 HX	103
5eb8ec6d HX	104	if (alg->exit)
	105	aead->base.exit = crypto_aead_exit_tfm;
	106
	107	if (alg->init)
	108	return alg->init(aead);
	109
63293c61 HX	110	return 0;
	111	}
	112
63293c61 HX	113	#ifdef CONFIG_NET
	114	static int crypto_aead_report(struct sk_buff skb, struct crypto_alg alg)
	115	{
	116	struct crypto_report_aead raead;
	117	struct aead_alg *aead = container_of(alg, struct aead_alg, base);
	118
37db69e0 EB	119	memset(&raead, 0, sizeof(raead));
	120
	121	strscpy(raead.type, "aead", sizeof(raead.type));
	122	strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
63293c61 HX	123
	124	raead.blocksize = alg->cra_blocksize;
	125	raead.maxauthsize = aead->maxauthsize;
	126	raead.ivsize = aead->ivsize;
	127
37db69e0	128	return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
63293c61 HX	129	}
	130	#else
	131	static int crypto_aead_report(struct sk_buff skb, struct crypto_alg alg)
	132	{
	133	return -ENOSYS;
	134	}
	135	#endif
	136
	137	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	138	__maybe_unused;
63293c61 HX	139	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
	140	{
	141	struct aead_alg *aead = container_of(alg, struct aead_alg, base);
	142
	143	seq_printf(m, "type : aead\n");
	144	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
	145	"yes" : "no");
	146	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	147	seq_printf(m, "ivsize : %u\n", aead->ivsize);
	148	seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
	149	seq_printf(m, "geniv : <none>\n");
	150	}
	151
ba75e15f HX	152	static void crypto_aead_free_instance(struct crypto_instance *inst)
	153	{
	154	struct aead_instance *aead = aead_instance(inst);
	155
	156	if (!aead->free) {
	157	inst->tmpl->free(inst);
	158	return;
	159	}
	160
	161	aead->free(aead);
	162	}
	163
b0d955ba	164	static const struct crypto_type crypto_aead_type = {
63293c61 HX	165	.extsize = crypto_alg_extsize,
63293c61 HX	166	.init_tfm = crypto_aead_init_tfm,
ba75e15f	167	.free = crypto_aead_free_instance,
63293c61 HX	168	#ifdef CONFIG_PROC_FS
	169	.show = crypto_aead_show,
	170	#endif
	171	.report = crypto_aead_report,
	172	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	173	.maskset = CRYPTO_ALG_TYPE_MASK,
	174	.type = CRYPTO_ALG_TYPE_AEAD,
	175	.tfmsize = offsetof(struct crypto_aead, base),
	176	};
	177
6350449f HX	178	static int aead_geniv_setkey(struct crypto_aead *tfm,
	179	const u8 *key, unsigned int keylen)
	180	{
	181	struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
	182
	183	return crypto_aead_setkey(ctx->child, key, keylen);
	184	}
	185
	186	static int aead_geniv_setauthsize(struct crypto_aead *tfm,
	187	unsigned int authsize)
	188	{
	189	struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
	190
	191	return crypto_aead_setauthsize(ctx->child, authsize);
	192	}
	193
856e3f40 HX	194	struct aead_instance aead_geniv_alloc(struct crypto_template tmpl,
856e3f40 HX	195	struct rtattr **tb, u32 type, u32 mask)
5b6d2d7f HX	196	{
	197	const char *name;
	198	struct crypto_aead_spawn *spawn;
	199	struct crypto_attr_type *algt;
856e3f40 HX	200	struct aead_instance *inst;
	201	struct aead_alg *alg;
	202	unsigned int ivsize;
	203	unsigned int maxauthsize;
5b6d2d7f HX	204	int err;
	205
	206	algt = crypto_get_attr_type(tb);
5b6d2d7f	207	if (IS_ERR(algt))
3e8afe35	208	return ERR_CAST(algt);
5b6d2d7f	209
5e4b8c1f	210	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
5b6d2d7f HX	211	return ERR_PTR(-EINVAL);
	212
	213	name = crypto_attr_alg_name(tb[1]);
5b6d2d7f	214	if (IS_ERR(name))
3e8afe35	215	return ERR_CAST(name);
5b6d2d7f HX	216
	217	inst = kzalloc(sizeof(inst) + sizeof(spawn), GFP_KERNEL);
	218	if (!inst)
	219	return ERR_PTR(-ENOMEM);
	220
856e3f40	221	spawn = aead_instance_ctx(inst);
5b6d2d7f HX	222
	223	/* Ignore async algorithms if necessary. */
	224	mask \|= crypto_requires_sync(algt->type, algt->mask);
	225
856e3f40	226	crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
b0d955ba	227	err = crypto_grab_aead(spawn, name, type, mask);
5b6d2d7f HX	228	if (err)
	229	goto err_free_inst;
	230
856e3f40 HX	231	alg = crypto_spawn_aead_alg(spawn);
856e3f40 HX	232
30e4c010 HX	233	ivsize = crypto_aead_alg_ivsize(alg);
30e4c010 HX	234	maxauthsize = crypto_aead_alg_maxauthsize(alg);
5b6d2d7f HX	235
5b6d2d7f HX	236	err = -EINVAL;
6350449f	237	if (ivsize < sizeof(u64))
5b6d2d7f HX	238	goto err_drop_alg;
5b6d2d7f HX	239
856e3f40 HX	240	err = -ENAMETOOLONG;
	241	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
	242	"%s(%s)", tmpl->name, alg->base.cra_name) >=
	243	CRYPTO_MAX_ALG_NAME)
	244	goto err_drop_alg;
	245	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
	246	"%s(%s)", tmpl->name, alg->base.cra_driver_name) >=
	247	CRYPTO_MAX_ALG_NAME)
	248	goto err_drop_alg;
5b6d2d7f	249
5e4b8c1f	250	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
856e3f40 HX	251	inst->alg.base.cra_priority = alg->base.cra_priority;
	252	inst->alg.base.cra_blocksize = alg->base.cra_blocksize;
	253	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
6350449f HX	254	inst->alg.base.cra_ctxsize = sizeof(struct aead_geniv_ctx);
	255
	256	inst->alg.setkey = aead_geniv_setkey;
	257	inst->alg.setauthsize = aead_geniv_setauthsize;
5b6d2d7f	258
856e3f40 HX	259	inst->alg.ivsize = ivsize;
856e3f40 HX	260	inst->alg.maxauthsize = maxauthsize;
5b6d2d7f HX	261
	262	out:
	263	return inst;
	264
	265	err_drop_alg:
	266	crypto_drop_aead(spawn);
	267	err_free_inst:
	268	kfree(inst);
	269	inst = ERR_PTR(err);
	270	goto out;
	271	}
	272	EXPORT_SYMBOL_GPL(aead_geniv_alloc);
	273
856e3f40	274	void aead_geniv_free(struct aead_instance *inst)
5b6d2d7f	275	{
856e3f40	276	crypto_drop_aead(aead_instance_ctx(inst));
5b6d2d7f HX	277	kfree(inst);
	278	}
	279	EXPORT_SYMBOL_GPL(aead_geniv_free);
	280
149a3971 HX	281	int aead_init_geniv(struct crypto_aead *aead)
	282	{
	283	struct aead_geniv_ctx *ctx = crypto_aead_ctx(aead);
	284	struct aead_instance *inst = aead_alg_instance(aead);
	285	struct crypto_aead *child;
	286	int err;
	287
	288	spin_lock_init(&ctx->lock);
	289
	290	err = crypto_get_default_rng();
	291	if (err)
	292	goto out;
	293
	294	err = crypto_rng_get_bytes(crypto_default_rng, ctx->salt,
	295	crypto_aead_ivsize(aead));
	296	crypto_put_default_rng();
	297	if (err)
	298	goto out;
	299
3a2d4fb5	300	ctx->sknull = crypto_get_default_null_skcipher();
ca0494c0 HX	301	err = PTR_ERR(ctx->sknull);
	302	if (IS_ERR(ctx->sknull))
	303	goto out;
	304
149a3971 HX	305	child = crypto_spawn_aead(aead_instance_ctx(inst));
	306	err = PTR_ERR(child);
	307	if (IS_ERR(child))
	308	goto drop_null;
	309
	310	ctx->child = child;
	311	crypto_aead_set_reqsize(aead, crypto_aead_reqsize(child) +
	312	sizeof(struct aead_request));
	313
	314	err = 0;
	315
	316	out:
	317	return err;
	318
	319	drop_null:
3a2d4fb5	320	crypto_put_default_null_skcipher();
149a3971 HX	321	goto out;
	322	}
	323	EXPORT_SYMBOL_GPL(aead_init_geniv);
	324
	325	void aead_exit_geniv(struct crypto_aead *tfm)
	326	{
	327	struct aead_geniv_ctx *ctx = crypto_aead_ctx(tfm);
	328
	329	crypto_free_aead(ctx->child);
3a2d4fb5	330	crypto_put_default_null_skcipher();
149a3971 HX	331	}
	332	EXPORT_SYMBOL_GPL(aead_exit_geniv);
	333
d29ce988 HX	334	int crypto_grab_aead(struct crypto_aead_spawn spawn, const char name,
	335	u32 type, u32 mask)
	336	{
5d1d65f8 HX	337	spawn->base.frontend = &crypto_aead_type;
5d1d65f8 HX	338	return crypto_grab_spawn(&spawn->base, name, type, mask);
d29ce988 HX	339	}
	340	EXPORT_SYMBOL_GPL(crypto_grab_aead);
	341
	342	struct crypto_aead crypto_alloc_aead(const char alg_name, u32 type, u32 mask)
	343	{
5d1d65f8	344	return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
d29ce988 HX	345	}
	346	EXPORT_SYMBOL_GPL(crypto_alloc_aead);
	347
63293c61 HX	348	static int aead_prepare_alg(struct aead_alg *alg)
	349	{
	350	struct crypto_alg *base = &alg->base;
	351
7a530aa9 HX	352	if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
7a530aa9 HX	353	PAGE_SIZE / 8)
63293c61 HX	354	return -EINVAL;
63293c61 HX	355
7a530aa9 HX	356	if (!alg->chunksize)
	357	alg->chunksize = base->cra_blocksize;
	358
b0d955ba	359	base->cra_type = &crypto_aead_type;
63293c61 HX	360	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	361	base->cra_flags \|= CRYPTO_ALG_TYPE_AEAD;
	362
	363	return 0;
	364	}
	365
	366	int crypto_register_aead(struct aead_alg *alg)
	367	{
	368	struct crypto_alg *base = &alg->base;
	369	int err;
	370
	371	err = aead_prepare_alg(alg);
	372	if (err)
	373	return err;
	374
	375	return crypto_register_alg(base);
	376	}
	377	EXPORT_SYMBOL_GPL(crypto_register_aead);
	378
43615369	379	void crypto_unregister_aead(struct aead_alg *alg)
63293c61	380	{
43615369	381	crypto_unregister_alg(&alg->base);
63293c61 HX	382	}
	383	EXPORT_SYMBOL_GPL(crypto_unregister_aead);
	384
caab9461 HX	385	int crypto_register_aeads(struct aead_alg *algs, int count)
	386	{
	387	int i, ret;
	388
	389	for (i = 0; i < count; i++) {
	390	ret = crypto_register_aead(&algs[i]);
	391	if (ret)
	392	goto err;
	393	}
	394
	395	return 0;
	396
	397	err:
	398	for (--i; i >= 0; --i)
	399	crypto_unregister_aead(&algs[i]);
	400
	401	return ret;
	402	}
	403	EXPORT_SYMBOL_GPL(crypto_register_aeads);
	404
	405	void crypto_unregister_aeads(struct aead_alg *algs, int count)
	406	{
	407	int i;
	408
	409	for (i = count - 1; i >= 0; --i)
	410	crypto_unregister_aead(&algs[i]);
	411	}
	412	EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
	413
63293c61 HX	414	int aead_register_instance(struct crypto_template *tmpl,
	415	struct aead_instance *inst)
	416	{
	417	int err;
	418
	419	err = aead_prepare_alg(&inst->alg);
	420	if (err)
	421	return err;
	422
	423	return crypto_register_instance(tmpl, aead_crypto_instance(inst));
	424	}
	425	EXPORT_SYMBOL_GPL(aead_register_instance);
	426
1ae97820 HX	427	MODULE_LICENSE("GPL");
1ae97820 HX	428	MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");