[linux-2.6-block.git] / crypto / akcipher.c

/*
 * Public Key Encryption
 *
 * Copyright (c) 2015, Intel Corporation
 * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/crypto.h>
#include <linux/compiler.h>
#include <crypto/algapi.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>
#include <crypto/akcipher.h>
#include <crypto/internal/akcipher.h>
#include "internal.h"

#ifdef CONFIG_NET
static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_akcipher rakcipher;

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

	strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));

	return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
		       sizeof(rakcipher), &rakcipher);
}
#else
static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
	__maybe_unused;

static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
{
	seq_puts(m, "type         : akcipher\n");
}

static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
{
	struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
	struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);

	alg->exit(akcipher);
}

static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm)
{
	struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
	struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);

	if (alg->exit)
		akcipher->base.exit = crypto_akcipher_exit_tfm;

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

	return 0;
}

static void crypto_akcipher_free_instance(struct crypto_instance *inst)
{
	struct akcipher_instance *akcipher = akcipher_instance(inst);

	akcipher->free(akcipher);
}

static const struct crypto_type crypto_akcipher_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_akcipher_init_tfm,
	.free = crypto_akcipher_free_instance,
#ifdef CONFIG_PROC_FS
	.show = crypto_akcipher_show,
#endif
	.report = crypto_akcipher_report,
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_AKCIPHER,
	.tfmsize = offsetof(struct crypto_akcipher, base),
};

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

struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
					      u32 mask)
{
	return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
}
EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);

static void akcipher_prepare_alg(struct akcipher_alg *alg)
{
	struct crypto_alg *base = &alg->base;

	base->cra_type = &crypto_akcipher_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
}

static int akcipher_default_op(struct akcipher_request *req)
{
	return -ENOSYS;
}

int crypto_register_akcipher(struct akcipher_alg *alg)
{
	struct crypto_alg *base = &alg->base;

	if (!alg->sign)
		alg->sign = akcipher_default_op;
	if (!alg->verify)
		alg->verify = akcipher_default_op;
	if (!alg->encrypt)
		alg->encrypt = akcipher_default_op;
	if (!alg->decrypt)
		alg->decrypt = akcipher_default_op;

	akcipher_prepare_alg(alg);
	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_akcipher);

void crypto_unregister_akcipher(struct akcipher_alg *alg)
{
	crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);

int akcipher_register_instance(struct crypto_template *tmpl,
			       struct akcipher_instance *inst)
{
	akcipher_prepare_alg(&inst->alg);
	return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
}
EXPORT_SYMBOL_GPL(akcipher_register_instance);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Generic public key cipher type");
Commit	Line	Data
3c339ab8 TS	1	/*
	2	* Public Key Encryption
	3	*
	4	* Copyright (c) 2015, Intel Corporation
	5	* Authors: Tadeusz Struk <tadeusz.struk@intel.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the Free
	9	* Software Foundation; either version 2 of the License, or (at your option)
	10	* any later version.
	11	*
	12	*/
	13	#include <linux/errno.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/seq_file.h>
	17	#include <linux/slab.h>
	18	#include <linux/string.h>
	19	#include <linux/crypto.h>
d8c34b94	20	#include <linux/compiler.h>
3c339ab8 TS	21	#include <crypto/algapi.h>
	22	#include <linux/cryptouser.h>
	23	#include <net/netlink.h>
	24	#include <crypto/akcipher.h>
28a4618a	25	#include <crypto/internal/akcipher.h>
3c339ab8 TS	26	#include "internal.h"
	27
	28	#ifdef CONFIG_NET
	29	static int crypto_akcipher_report(struct sk_buff skb, struct crypto_alg alg)
	30	{
	31	struct crypto_report_akcipher rakcipher;
	32
37db69e0	33	memset(&rakcipher, 0, sizeof(rakcipher));
3c339ab8	34
37db69e0	35	strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
3c339ab8	36
37db69e0 EB	37	return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
37db69e0 EB	38	sizeof(rakcipher), &rakcipher);
3c339ab8 TS	39	}
	40	#else
	41	static int crypto_akcipher_report(struct sk_buff skb, struct crypto_alg alg)
	42	{
	43	return -ENOSYS;
	44	}
	45	#endif
	46
	47	static void crypto_akcipher_show(struct seq_file m, struct crypto_alg alg)
d8c34b94	48	__maybe_unused;
3c339ab8 TS	49
	50	static void crypto_akcipher_show(struct seq_file m, struct crypto_alg alg)
	51	{
	52	seq_puts(m, "type : akcipher\n");
	53	}
	54
	55	static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
	56	{
	57	struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
	58	struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
	59
	60	alg->exit(akcipher);
	61	}
	62
	63	static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm)
	64	{
	65	struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
	66	struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
	67
	68	if (alg->exit)
	69	akcipher->base.exit = crypto_akcipher_exit_tfm;
	70
	71	if (alg->init)
	72	return alg->init(akcipher);
	73
	74	return 0;
	75	}
	76
28a4618a AZ	77	static void crypto_akcipher_free_instance(struct crypto_instance *inst)
	78	{
	79	struct akcipher_instance *akcipher = akcipher_instance(inst);
	80
	81	akcipher->free(akcipher);
	82	}
	83
3c339ab8 TS	84	static const struct crypto_type crypto_akcipher_type = {
	85	.extsize = crypto_alg_extsize,
	86	.init_tfm = crypto_akcipher_init_tfm,
28a4618a	87	.free = crypto_akcipher_free_instance,
3c339ab8 TS	88	#ifdef CONFIG_PROC_FS
	89	.show = crypto_akcipher_show,
	90	#endif
	91	.report = crypto_akcipher_report,
	92	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	93	.maskset = CRYPTO_ALG_TYPE_MASK,
	94	.type = CRYPTO_ALG_TYPE_AKCIPHER,
	95	.tfmsize = offsetof(struct crypto_akcipher, base),
	96	};
	97
28a4618a AZ	98	int crypto_grab_akcipher(struct crypto_akcipher_spawn spawn, const char name,
	99	u32 type, u32 mask)
	100	{
	101	spawn->base.frontend = &crypto_akcipher_type;
	102	return crypto_grab_spawn(&spawn->base, name, type, mask);
	103	}
	104	EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
	105
3c339ab8 TS	106	struct crypto_akcipher crypto_alloc_akcipher(const char alg_name, u32 type,
	107	u32 mask)
	108	{
	109	return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
	110	}
	111	EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
	112
28a4618a	113	static void akcipher_prepare_alg(struct akcipher_alg *alg)
3c339ab8 TS	114	{
	115	struct crypto_alg *base = &alg->base;
	116
	117	base->cra_type = &crypto_akcipher_type;
	118	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	119	base->cra_flags \|= CRYPTO_ALG_TYPE_AKCIPHER;
28a4618a AZ	120	}
28a4618a AZ	121
78a0324f VC	122	static int akcipher_default_op(struct akcipher_request *req)
	123	{
	124	return -ENOSYS;
	125	}
	126
28a4618a AZ	127	int crypto_register_akcipher(struct akcipher_alg *alg)
	128	{
	129	struct crypto_alg *base = &alg->base;
	130
78a0324f VC	131	if (!alg->sign)
	132	alg->sign = akcipher_default_op;
	133	if (!alg->verify)
	134	alg->verify = akcipher_default_op;
	135	if (!alg->encrypt)
	136	alg->encrypt = akcipher_default_op;
	137	if (!alg->decrypt)
	138	alg->decrypt = akcipher_default_op;
	139
28a4618a	140	akcipher_prepare_alg(alg);
3c339ab8 TS	141	return crypto_register_alg(base);
	142	}
	143	EXPORT_SYMBOL_GPL(crypto_register_akcipher);
	144
	145	void crypto_unregister_akcipher(struct akcipher_alg *alg)
	146	{
	147	crypto_unregister_alg(&alg->base);
	148	}
	149	EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
	150
28a4618a AZ	151	int akcipher_register_instance(struct crypto_template *tmpl,
	152	struct akcipher_instance *inst)
	153	{
	154	akcipher_prepare_alg(&inst->alg);
	155	return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
	156	}
	157	EXPORT_SYMBOL_GPL(akcipher_register_instance);
	158
3c339ab8	159	MODULE_LICENSE("GPL");
338a9de0	160	MODULE_DESCRIPTION("Generic public key cipher type");