[linux-2.6-block.git] / include / crypto / algapi.h

/*
 * Cryptographic API for algorithms (i.e., low-level API).
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * 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.
 *
 */
#ifndef _CRYPTO_ALGAPI_H
#define _CRYPTO_ALGAPI_H

#include <linux/crypto.h>

struct module;
struct rtattr;
struct seq_file;

struct crypto_type {
	unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
	int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
	void (*exit)(struct crypto_tfm *tfm);
	void (*show)(struct seq_file *m, struct crypto_alg *alg);
};

struct crypto_instance {
	struct crypto_alg alg;

	struct crypto_template *tmpl;
	struct hlist_node list;

	void *__ctx[] CRYPTO_MINALIGN_ATTR;
};

struct crypto_template {
	struct list_head list;
	struct hlist_head instances;
	struct module *module;

	struct crypto_instance *(*alloc)(struct rtattr **tb);
	void (*free)(struct crypto_instance *inst);

	char name[CRYPTO_MAX_ALG_NAME];
};

struct crypto_spawn {
	struct list_head list;
	struct crypto_alg *alg;
	struct crypto_instance *inst;
};

struct scatter_walk {
	struct scatterlist *sg;
	unsigned int offset;
};

struct blkcipher_walk {
	union {
		struct {
			struct page *page;
			unsigned long offset;
		} phys;

		struct {
			u8 *page;
			u8 *addr;
		} virt;
	} src, dst;

	struct scatter_walk in;
	unsigned int nbytes;

	struct scatter_walk out;
	unsigned int total;

	void *page;
	u8 *buffer;
	u8 *iv;

	int flags;
};

extern const struct crypto_type crypto_blkcipher_type;
extern const struct crypto_type crypto_hash_type;

void crypto_mod_put(struct crypto_alg *alg);

int crypto_register_template(struct crypto_template *tmpl);
void crypto_unregister_template(struct crypto_template *tmpl);
struct crypto_template *crypto_lookup_template(const char *name);

int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
		      struct crypto_instance *inst);
void crypto_drop_spawn(struct crypto_spawn *spawn);
struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
				    u32 mask);

struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
int crypto_check_attr_type(struct rtattr **tb, u32 type);
struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask);
struct crypto_instance *crypto_alloc_instance(const char *name,
					      struct crypto_alg *alg);

int blkcipher_walk_done(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk, int err);
int blkcipher_walk_virt(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk);
int blkcipher_walk_phys(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk);

static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
{
	unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
	unsigned long align = crypto_tfm_alg_alignmask(tfm);

	if (align <= crypto_tfm_ctx_alignment())
		align = 1;
	return (void *)ALIGN(addr, align);
}

static inline void *crypto_instance_ctx(struct crypto_instance *inst)
{
	return inst->__ctx;
}

static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
{
	return crypto_tfm_ctx(&tfm->base);
}

static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
{
	return crypto_tfm_ctx_aligned(&tfm->base);
}

static inline struct crypto_cipher *crypto_spawn_cipher(
	struct crypto_spawn *spawn)
{
	u32 type = CRYPTO_ALG_TYPE_CIPHER;
	u32 mask = CRYPTO_ALG_TYPE_MASK;

	return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
}

static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
{
	return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
}

static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
{
	u32 type = CRYPTO_ALG_TYPE_HASH;
	u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;

	return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
}

static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
{
	return crypto_tfm_ctx_aligned(&tfm->base);
}

static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
				       struct scatterlist *dst,
				       struct scatterlist *src,
				       unsigned int nbytes)
{
	walk->in.sg = src;
	walk->out.sg = dst;
	walk->total = nbytes;
}

#endif	/* _CRYPTO_ALGAPI_H */
Commit	Line	Data
cce9e06d HX	1	/*
	2	* Cryptographic API for algorithms (i.e., low-level API).
	3	*
	4	* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the Free
	8	* Software Foundation; either version 2 of the License, or (at your option)
	9	* any later version.
	10	*
	11	*/
	12	#ifndef _CRYPTO_ALGAPI_H
	13	#define _CRYPTO_ALGAPI_H
	14
	15	#include <linux/crypto.h>
	16
4cc7720c	17	struct module;
ebc610e5	18	struct rtattr;
e853c3cf HX	19	struct seq_file;
	20
	21	struct crypto_type {
27d2a330 HX	22	unsigned int (ctxsize)(struct crypto_alg alg, u32 type, u32 mask);
27d2a330 HX	23	int (init)(struct crypto_tfm tfm, u32 type, u32 mask);
e853c3cf HX	24	void (exit)(struct crypto_tfm tfm);
	25	void (show)(struct seq_file m, struct crypto_alg *alg);
	26	};
4cc7720c HX	27
	28	struct crypto_instance {
	29	struct crypto_alg alg;
	30
	31	struct crypto_template *tmpl;
	32	struct hlist_node list;
	33
	34	void *__ctx[] CRYPTO_MINALIGN_ATTR;
	35	};
	36
	37	struct crypto_template {
	38	struct list_head list;
	39	struct hlist_head instances;
	40	struct module *module;
	41
ebc610e5	42	struct crypto_instance (alloc)(struct rtattr **tb);
4cc7720c HX	43	void (free)(struct crypto_instance inst);
	44
	45	char name[CRYPTO_MAX_ALG_NAME];
	46	};
	47
6bfd4809 HX	48	struct crypto_spawn {
	49	struct list_head list;
	50	struct crypto_alg *alg;
	51	struct crypto_instance *inst;
	52	};
	53
5c64097a HX	54	struct scatter_walk {
	55	struct scatterlist *sg;
	56	unsigned int offset;
	57	};
	58
5cde0af2 HX	59	struct blkcipher_walk {
	60	union {
	61	struct {
	62	struct page *page;
	63	unsigned long offset;
	64	} phys;
	65
	66	struct {
	67	u8 *page;
	68	u8 *addr;
	69	} virt;
	70	} src, dst;
	71
	72	struct scatter_walk in;
	73	unsigned int nbytes;
	74
	75	struct scatter_walk out;
	76	unsigned int total;
	77
	78	void *page;
	79	u8 *buffer;
	80	u8 *iv;
	81
	82	int flags;
	83	};
	84
	85	extern const struct crypto_type crypto_blkcipher_type;
055bcee3	86	extern const struct crypto_type crypto_hash_type;
5cde0af2	87
db131ef9 HX	88	void crypto_mod_put(struct crypto_alg *alg);
db131ef9 HX	89
4cc7720c HX	90	int crypto_register_template(struct crypto_template *tmpl);
	91	void crypto_unregister_template(struct crypto_template *tmpl);
	92	struct crypto_template crypto_lookup_template(const char name);
	93
6bfd4809 HX	94	int crypto_init_spawn(struct crypto_spawn spawn, struct crypto_alg alg,
	95	struct crypto_instance *inst);
	96	void crypto_drop_spawn(struct crypto_spawn *spawn);
2e306ee0 HX	97	struct crypto_tfm crypto_spawn_tfm(struct crypto_spawn spawn, u32 type,
2e306ee0 HX	98	u32 mask);
6bfd4809	99
ebc610e5 HX	100	struct crypto_attr_type crypto_get_attr_type(struct rtattr *tb);
	101	int crypto_check_attr_type(struct rtattr **tb, u32 type);
	102	struct crypto_alg crypto_get_attr_alg(struct rtattr *tb, u32 type, u32 mask);
7fed0bf2 HX	103	struct crypto_instance crypto_alloc_instance(const char name,
	104	struct crypto_alg *alg);
	105
5cde0af2 HX	106	int blkcipher_walk_done(struct blkcipher_desc *desc,
	107	struct blkcipher_walk *walk, int err);
	108	int blkcipher_walk_virt(struct blkcipher_desc *desc,
	109	struct blkcipher_walk *walk);
	110	int blkcipher_walk_phys(struct blkcipher_desc *desc,
	111	struct blkcipher_walk *walk);
	112
	113	static inline void crypto_tfm_ctx_aligned(struct crypto_tfm tfm)
	114	{
	115	unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
	116	unsigned long align = crypto_tfm_alg_alignmask(tfm);
	117
	118	if (align <= crypto_tfm_ctx_alignment())
	119	align = 1;
	120	return (void *)ALIGN(addr, align);
	121	}
	122
4cc7720c HX	123	static inline void crypto_instance_ctx(struct crypto_instance inst)
	124	{
	125	return inst->__ctx;
	126	}
	127
5cde0af2 HX	128	static inline void crypto_blkcipher_ctx(struct crypto_blkcipher tfm)
	129	{
	130	return crypto_tfm_ctx(&tfm->base);
	131	}
	132
	133	static inline void crypto_blkcipher_ctx_aligned(struct crypto_blkcipher tfm)
	134	{
	135	return crypto_tfm_ctx_aligned(&tfm->base);
	136	}
	137
2e306ee0 HX	138	static inline struct crypto_cipher *crypto_spawn_cipher(
	139	struct crypto_spawn *spawn)
	140	{
	141	u32 type = CRYPTO_ALG_TYPE_CIPHER;
	142	u32 mask = CRYPTO_ALG_TYPE_MASK;
	143
	144	return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
	145	}
	146
f28776a3 HX	147	static inline struct cipher_alg crypto_cipher_alg(struct crypto_cipher tfm)
	148	{
	149	return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
	150	}
	151
2e306ee0 HX	152	static inline struct crypto_hash crypto_spawn_hash(struct crypto_spawn spawn)
	153	{
	154	u32 type = CRYPTO_ALG_TYPE_HASH;
	155	u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
	156
	157	return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
	158	}
	159
055bcee3 HX	160	static inline void crypto_hash_ctx_aligned(struct crypto_hash tfm)
	161	{
	162	return crypto_tfm_ctx_aligned(&tfm->base);
	163	}
	164
5cde0af2 HX	165	static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
	166	struct scatterlist *dst,
	167	struct scatterlist *src,
	168	unsigned int nbytes)
	169	{
	170	walk->in.sg = src;
	171	walk->out.sg = dst;
	172	walk->total = nbytes;
	173	}
	174
cce9e06d HX	175	#endif /* _CRYPTO_ALGAPI_H */
cce9e06d HX	176