[linux-block.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/aead.h>
#include <linux/cryptouser.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/string.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);
	kfree_sensitive(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)) ||
	    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);

int crypto_aead_encrypt(struct aead_request *req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);

	if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
		return -ENOKEY;

	return crypto_aead_alg(aead)->encrypt(req);
}
EXPORT_SYMBOL_GPL(crypto_aead_encrypt);

int crypto_aead_decrypt(struct aead_request *req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);

	if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
		return -ENOKEY;

	if (req->cryptlen < crypto_aead_authsize(aead))
		return -EINVAL;

	return crypto_aead_alg(aead)->decrypt(req);
}
EXPORT_SYMBOL_GPL(crypto_aead_decrypt);

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;
}

static int __maybe_unused 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);
}

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);

	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
#if IS_ENABLED(CONFIG_CRYPTO_USER)
	.report = crypto_aead_report,
#endif
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_AEAD,
	.tfmsize = offsetof(struct crypto_aead, base),
};

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

int crypto_has_aead(const char *alg_name, u32 type, u32 mask)
{
	return crypto_type_has_alg(alg_name, &crypto_aead_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_has_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;

	if (WARN_ON(!inst->free))
		return -EINVAL;

	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
20cc01ba	10	#include <crypto/internal/aead.h>
0df4adf8	11	#include <linux/cryptouser.h>
20cc01ba	12	#include <linux/errno.h>
1ae97820 HX	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>
0df4adf8	18	#include <linux/string.h>
6ad414fe	19	#include <net/netlink.h>
1ae97820	20
5b6d2d7f HX	21	#include "internal.h"
5b6d2d7f HX	22
1ae97820 HX	23	static int setkey_unaligned(struct crypto_aead tfm, const u8 key,
	24	unsigned int keylen)
	25	{
1ae97820 HX	26	unsigned long alignmask = crypto_aead_alignmask(tfm);
	27	int ret;
	28	u8 buffer, alignbuffer;
	29	unsigned long absize;
	30
	31	absize = keylen + alignmask;
	32	buffer = kmalloc(absize, GFP_ATOMIC);
	33	if (!buffer)
	34	return -ENOMEM;
	35
	36	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
	37	memcpy(alignbuffer, key, keylen);
b0d955ba	38	ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
23e4099b	39	kfree_sensitive(buffer);
1ae97820 HX	40	return ret;
	41	}
	42
5d1d65f8 HX	43	int crypto_aead_setkey(struct crypto_aead *tfm,
5d1d65f8 HX	44	const u8 *key, unsigned int keylen)
1ae97820	45	{
1ae97820	46	unsigned long alignmask = crypto_aead_alignmask(tfm);
dc26c17f	47	int err;
1ae97820 HX	48
1ae97820 HX	49	if ((unsigned long)key & alignmask)
dc26c17f EB	50	err = setkey_unaligned(tfm, key, keylen);
	51	else
	52	err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);
	53
6ebc9700 EB	54	if (unlikely(err)) {
6ebc9700 EB	55	crypto_aead_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
dc26c17f	56	return err;
6ebc9700	57	}
1ae97820	58
dc26c17f EB	59	crypto_aead_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
dc26c17f EB	60	return 0;
1ae97820	61	}
5d1d65f8	62	EXPORT_SYMBOL_GPL(crypto_aead_setkey);
1ae97820	63
7ba683a6 HX	64	int crypto_aead_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
	65	{
	66	int err;
	67
a62084d2 PL	68	if ((!authsize && crypto_aead_maxauthsize(tfm)) \|\|
a62084d2 PL	69	authsize > crypto_aead_maxauthsize(tfm))
7ba683a6 HX	70	return -EINVAL;
7ba683a6 HX	71
b0d955ba HX	72	if (crypto_aead_alg(tfm)->setauthsize) {
b0d955ba HX	73	err = crypto_aead_alg(tfm)->setauthsize(tfm, authsize);
7ba683a6 HX	74	if (err)
	75	return err;
	76	}
	77
5d1d65f8	78	tfm->authsize = authsize;
7ba683a6 HX	79	return 0;
	80	}
	81	EXPORT_SYMBOL_GPL(crypto_aead_setauthsize);
	82
f2fe1154 EB	83	int crypto_aead_encrypt(struct aead_request *req)
	84	{
	85	struct crypto_aead *aead = crypto_aead_reqtfm(req);
0df4adf8	86
f2fe1154	87	if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
29ce50e0	88	return -ENOKEY;
0df4adf8	89
29ce50e0	90	return crypto_aead_alg(aead)->encrypt(req);
f2fe1154 EB	91	}
	92	EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
	93
	94	int crypto_aead_decrypt(struct aead_request *req)
	95	{
	96	struct crypto_aead *aead = crypto_aead_reqtfm(req);
0df4adf8	97
f2fe1154	98	if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
29ce50e0 EB	99	return -ENOKEY;
	100
	101	if (req->cryptlen < crypto_aead_authsize(aead))
	102	return -EINVAL;
0df4adf8	103
29ce50e0	104	return crypto_aead_alg(aead)->decrypt(req);
f2fe1154 EB	105	}
	106	EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
	107
5eb8ec6d HX	108	static void crypto_aead_exit_tfm(struct crypto_tfm *tfm)
	109	{
	110	struct crypto_aead *aead = __crypto_aead_cast(tfm);
	111	struct aead_alg *alg = crypto_aead_alg(aead);
	112
	113	alg->exit(aead);
	114	}
	115
63293c61 HX	116	static int crypto_aead_init_tfm(struct crypto_tfm *tfm)
	117	{
	118	struct crypto_aead *aead = __crypto_aead_cast(tfm);
	119	struct aead_alg *alg = crypto_aead_alg(aead);
	120
dc26c17f EB	121	crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
dc26c17f EB	122
63293c61 HX	123	aead->authsize = alg->maxauthsize;
63293c61 HX	124
5eb8ec6d HX	125	if (alg->exit)
	126	aead->base.exit = crypto_aead_exit_tfm;
	127
	128	if (alg->init)
	129	return alg->init(aead);
	130
63293c61 HX	131	return 0;
	132	}
	133
c0f9e01d HX	134	static int __maybe_unused crypto_aead_report(
c0f9e01d HX	135	struct sk_buff skb, struct crypto_alg alg)
63293c61 HX	136	{
	137	struct crypto_report_aead raead;
	138	struct aead_alg *aead = container_of(alg, struct aead_alg, base);
	139
37db69e0 EB	140	memset(&raead, 0, sizeof(raead));
	141
	142	strscpy(raead.type, "aead", sizeof(raead.type));
	143	strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
63293c61 HX	144
	145	raead.blocksize = alg->cra_blocksize;
	146	raead.maxauthsize = aead->maxauthsize;
	147	raead.ivsize = aead->ivsize;
	148
37db69e0	149	return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
63293c61	150	}
63293c61 HX	151
63293c61 HX	152	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	153	__maybe_unused;
63293c61 HX	154	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
	155	{
	156	struct aead_alg *aead = container_of(alg, struct aead_alg, base);
	157
	158	seq_printf(m, "type : aead\n");
	159	seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
	160	"yes" : "no");
	161	seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
	162	seq_printf(m, "ivsize : %u\n", aead->ivsize);
	163	seq_printf(m, "maxauthsize : %u\n", aead->maxauthsize);
	164	seq_printf(m, "geniv : <none>\n");
	165	}
	166
ba75e15f HX	167	static void crypto_aead_free_instance(struct crypto_instance *inst)
	168	{
	169	struct aead_instance *aead = aead_instance(inst);
	170
ba75e15f HX	171	aead->free(aead);
	172	}
	173
b0d955ba	174	static const struct crypto_type crypto_aead_type = {
63293c61 HX	175	.extsize = crypto_alg_extsize,
63293c61 HX	176	.init_tfm = crypto_aead_init_tfm,
ba75e15f	177	.free = crypto_aead_free_instance,
63293c61 HX	178	#ifdef CONFIG_PROC_FS
	179	.show = crypto_aead_show,
	180	#endif
b8969a1b	181	#if IS_ENABLED(CONFIG_CRYPTO_USER)
63293c61	182	.report = crypto_aead_report,
0df4adf8	183	#endif
63293c61 HX	184	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	185	.maskset = CRYPTO_ALG_TYPE_MASK,
	186	.type = CRYPTO_ALG_TYPE_AEAD,
	187	.tfmsize = offsetof(struct crypto_aead, base),
	188	};
	189
cd900f0c EB	190	int crypto_grab_aead(struct crypto_aead_spawn *spawn,
	191	struct crypto_instance *inst,
	192	const char *name, u32 type, u32 mask)
d29ce988	193	{
5d1d65f8	194	spawn->base.frontend = &crypto_aead_type;
de95c957	195	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
d29ce988 HX	196	}
	197	EXPORT_SYMBOL_GPL(crypto_grab_aead);
	198
	199	struct crypto_aead crypto_alloc_aead(const char alg_name, u32 type, u32 mask)
	200	{
5d1d65f8	201	return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
d29ce988 HX	202	}
	203	EXPORT_SYMBOL_GPL(crypto_alloc_aead);
	204
534562e5 HX	205	int crypto_has_aead(const char *alg_name, u32 type, u32 mask)
	206	{
	207	return crypto_type_has_alg(alg_name, &crypto_aead_type, type, mask);
	208	}
	209	EXPORT_SYMBOL_GPL(crypto_has_aead);
	210
63293c61 HX	211	static int aead_prepare_alg(struct aead_alg *alg)
	212	{
	213	struct crypto_alg *base = &alg->base;
	214
7a530aa9 HX	215	if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
7a530aa9 HX	216	PAGE_SIZE / 8)
63293c61 HX	217	return -EINVAL;
63293c61 HX	218
7a530aa9 HX	219	if (!alg->chunksize)
	220	alg->chunksize = base->cra_blocksize;
	221
b0d955ba	222	base->cra_type = &crypto_aead_type;
63293c61 HX	223	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	224	base->cra_flags \|= CRYPTO_ALG_TYPE_AEAD;
	225
	226	return 0;
	227	}
	228
	229	int crypto_register_aead(struct aead_alg *alg)
	230	{
	231	struct crypto_alg *base = &alg->base;
	232	int err;
	233
	234	err = aead_prepare_alg(alg);
	235	if (err)
	236	return err;
	237
	238	return crypto_register_alg(base);
	239	}
	240	EXPORT_SYMBOL_GPL(crypto_register_aead);
	241
43615369	242	void crypto_unregister_aead(struct aead_alg *alg)
63293c61	243	{
43615369	244	crypto_unregister_alg(&alg->base);
63293c61 HX	245	}
	246	EXPORT_SYMBOL_GPL(crypto_unregister_aead);
	247
caab9461 HX	248	int crypto_register_aeads(struct aead_alg *algs, int count)
	249	{
	250	int i, ret;
	251
	252	for (i = 0; i < count; i++) {
	253	ret = crypto_register_aead(&algs[i]);
	254	if (ret)
	255	goto err;
	256	}
	257
	258	return 0;
	259
	260	err:
	261	for (--i; i >= 0; --i)
	262	crypto_unregister_aead(&algs[i]);
	263
	264	return ret;
	265	}
	266	EXPORT_SYMBOL_GPL(crypto_register_aeads);
	267
	268	void crypto_unregister_aeads(struct aead_alg *algs, int count)
	269	{
	270	int i;
	271
	272	for (i = count - 1; i >= 0; --i)
	273	crypto_unregister_aead(&algs[i]);
	274	}
	275	EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
	276
63293c61 HX	277	int aead_register_instance(struct crypto_template *tmpl,
	278	struct aead_instance *inst)
	279	{
	280	int err;
	281
d4fdc2df EB	282	if (WARN_ON(!inst->free))
	283	return -EINVAL;
	284
63293c61 HX	285	err = aead_prepare_alg(&inst->alg);
	286	if (err)
	287	return err;
	288
	289	return crypto_register_instance(tmpl, aead_crypto_instance(inst));
	290	}
	291	EXPORT_SYMBOL_GPL(aead_register_instance);
	292
1ae97820 HX	293	MODULE_LICENSE("GPL");
1ae97820 HX	294	MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");