[linux.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 <[email protected]>
 */

#include <crypto/internal/aead.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/cryptouser.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)) ||
	    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);
	struct crypto_alg *alg = aead->base.__crt_alg;
	unsigned int cryptlen = req->cryptlen;
	int ret;

	crypto_stats_get(alg);
	if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
		ret = -ENOKEY;
	else
		ret = crypto_aead_alg(aead)->encrypt(req);
	crypto_stats_aead_encrypt(cryptlen, alg, ret);
	return ret;
}
EXPORT_SYMBOL_GPL(crypto_aead_encrypt);

int crypto_aead_decrypt(struct aead_request *req)
{
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	struct crypto_alg *alg = aead->base.__crt_alg;
	unsigned int cryptlen = req->cryptlen;
	int ret;

	crypto_stats_get(alg);
	if (crypto_aead_get_flags(aead) & CRYPTO_TFM_NEED_KEY)
		ret = -ENOKEY;
	else if (req->cryptlen < crypto_aead_authsize(aead))
		ret = -EINVAL;
	else
		ret = crypto_aead_alg(aead)->decrypt(req);
	crypto_stats_aead_decrypt(cryptlen, alg, ret);
	return ret;
}
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;
}

#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);

	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),
};

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);

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 <[email protected]>
1ae97820 HX	8	*/
1ae97820 HX	9
20cc01ba HX	10	#include <crypto/internal/aead.h>
20cc01ba HX	11	#include <linux/errno.h>
1ae97820 HX	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>
6ad414fe SK	17	#include <linux/cryptouser.h>
6ad414fe SK	18	#include <net/netlink.h>
1ae97820	19
5b6d2d7f HX	20	#include "internal.h"
5b6d2d7f HX	21
1ae97820 HX	22	static int setkey_unaligned(struct crypto_aead tfm, const u8 key,
	23	unsigned int keylen)
	24	{
1ae97820 HX	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);
b0d955ba	37	ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);
1ae97820 HX	38	memset(alignbuffer, 0, keylen);
	39	kfree(buffer);
	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);
	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	}
	98	EXPORT_SYMBOL_GPL(crypto_aead_encrypt);
	99
	100	int 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	}
	117	EXPORT_SYMBOL_GPL(crypto_aead_decrypt);
	118
5eb8ec6d HX	119	static 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
63293c61 HX	127	static 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
dc26c17f EB	132	crypto_aead_set_flags(aead, CRYPTO_TFM_NEED_KEY);
dc26c17f EB	133
63293c61 HX	134	aead->authsize = alg->maxauthsize;
63293c61 HX	135
5eb8ec6d HX	136	if (alg->exit)
	137	aead->base.exit = crypto_aead_exit_tfm;
	138
	139	if (alg->init)
	140	return alg->init(aead);
	141
63293c61 HX	142	return 0;
	143	}
	144
63293c61 HX	145	#ifdef CONFIG_NET
	146	static 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
37db69e0 EB	151	memset(&raead, 0, sizeof(raead));
	152
	153	strscpy(raead.type, "aead", sizeof(raead.type));
	154	strscpy(raead.geniv, "<none>", sizeof(raead.geniv));
63293c61 HX	155
	156	raead.blocksize = alg->cra_blocksize;
	157	raead.maxauthsize = aead->maxauthsize;
	158	raead.ivsize = aead->ivsize;
	159
37db69e0	160	return nla_put(skb, CRYPTOCFGA_REPORT_AEAD, sizeof(raead), &raead);
63293c61 HX	161	}
	162	#else
	163	static int crypto_aead_report(struct sk_buff skb, struct crypto_alg alg)
	164	{
	165	return -ENOSYS;
	166	}
	167	#endif
	168
	169	static void crypto_aead_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	170	__maybe_unused;
63293c61 HX	171	static 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
ba75e15f HX	184	static void crypto_aead_free_instance(struct crypto_instance *inst)
	185	{
	186	struct aead_instance *aead = aead_instance(inst);
	187
ba75e15f HX	188	aead->free(aead);
	189	}
	190
b0d955ba	191	static const struct crypto_type crypto_aead_type = {
63293c61 HX	192	.extsize = crypto_alg_extsize,
63293c61 HX	193	.init_tfm = crypto_aead_init_tfm,
ba75e15f	194	.free = crypto_aead_free_instance,
63293c61 HX	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
cd900f0c EB	205	int crypto_grab_aead(struct crypto_aead_spawn *spawn,
	206	struct crypto_instance *inst,
	207	const char *name, u32 type, u32 mask)
d29ce988	208	{
5d1d65f8	209	spawn->base.frontend = &crypto_aead_type;
de95c957	210	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
d29ce988 HX	211	}
	212	EXPORT_SYMBOL_GPL(crypto_grab_aead);
	213
	214	struct crypto_aead crypto_alloc_aead(const char alg_name, u32 type, u32 mask)
	215	{
5d1d65f8	216	return crypto_alloc_tfm(alg_name, &crypto_aead_type, type, mask);
d29ce988 HX	217	}
	218	EXPORT_SYMBOL_GPL(crypto_alloc_aead);
	219
63293c61 HX	220	static int aead_prepare_alg(struct aead_alg *alg)
	221	{
	222	struct crypto_alg *base = &alg->base;
	223
7a530aa9 HX	224	if (max3(alg->maxauthsize, alg->ivsize, alg->chunksize) >
7a530aa9 HX	225	PAGE_SIZE / 8)
63293c61 HX	226	return -EINVAL;
63293c61 HX	227
7a530aa9 HX	228	if (!alg->chunksize)
	229	alg->chunksize = base->cra_blocksize;
	230
b0d955ba	231	base->cra_type = &crypto_aead_type;
63293c61 HX	232	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	233	base->cra_flags \|= CRYPTO_ALG_TYPE_AEAD;
	234
	235	return 0;
	236	}
	237
	238	int 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	}
	249	EXPORT_SYMBOL_GPL(crypto_register_aead);
	250
43615369	251	void crypto_unregister_aead(struct aead_alg *alg)
63293c61	252	{
43615369	253	crypto_unregister_alg(&alg->base);
63293c61 HX	254	}
	255	EXPORT_SYMBOL_GPL(crypto_unregister_aead);
	256
caab9461 HX	257	int 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
	269	err:
	270	for (--i; i >= 0; --i)
	271	crypto_unregister_aead(&algs[i]);
	272
	273	return ret;
	274	}
	275	EXPORT_SYMBOL_GPL(crypto_register_aeads);
	276
	277	void 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	}
	284	EXPORT_SYMBOL_GPL(crypto_unregister_aeads);
	285
63293c61 HX	286	int aead_register_instance(struct crypto_template *tmpl,
	287	struct aead_instance *inst)
	288	{
	289	int err;
	290
	291	err = aead_prepare_alg(&inst->alg);
	292	if (err)
	293	return err;
	294
	295	return crypto_register_instance(tmpl, aead_crypto_instance(inst));
	296	}
	297	EXPORT_SYMBOL_GPL(aead_register_instance);
	298
1ae97820 HX	299	MODULE_LICENSE("GPL");
1ae97820 HX	300	MODULE_DESCRIPTION("Authenticated Encryption with Associated Data (AEAD)");