crypto.h

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/*
 * Scatterlist Cryptographic API.
 *
 * Copyright (c) 2002 James Morris <[e-mail]>
 * Copyright (c) 2002 David S. Miller ([e-mail])
 * Copyright (c) 2005 Herbert Xu <[e-mail]>
 *
 * Portions derived from Cryptoapi, by Alexander Kjeldaas <[e-mail]>
 * and Nettle, by Niels Möller.
 * 
 * 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 _LINUX_CRYPTO_H
#define _LINUX_CRYPTO_H

#include <asm/atomic.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>

/*
 * Algorithm masks and types.
 */
#define CRYPTO_ALG_TYPE_MASK		0x0000000f
#define CRYPTO_ALG_TYPE_CIPHER		0x00000001
#define CRYPTO_ALG_TYPE_DIGEST		0x00000002
#define CRYPTO_ALG_TYPE_HASH		0x00000003
#define CRYPTO_ALG_TYPE_BLKCIPHER	0x00000004
#define CRYPTO_ALG_TYPE_COMPRESS	0x00000005
#define CRYPTO_ALG_TYPE_AEAD		0x00000006

#define CRYPTO_ALG_TYPE_HASH_MASK	0x0000000e

#define CRYPTO_ALG_LARVAL		0x00000010
#define CRYPTO_ALG_DEAD			0x00000020
#define CRYPTO_ALG_DYING		0x00000040
#define CRYPTO_ALG_ASYNC		0x00000080

/*
 * Set this bit if and only if the algorithm requires another algorithm of
 * the same type to handle corner cases.
 */
#define CRYPTO_ALG_NEED_FALLBACK	0x00000100

/*
 * Transform masks and values (for crt_flags).
 */
#define CRYPTO_TFM_REQ_MASK		0x000fff00
#define CRYPTO_TFM_RES_MASK		0xfff00000

#define CRYPTO_TFM_REQ_WEAK_KEY		0x00000100
#define CRYPTO_TFM_REQ_MAY_SLEEP	0x00000200
#define CRYPTO_TFM_REQ_MAY_BACKLOG	0x00000400
#define CRYPTO_TFM_RES_WEAK_KEY		0x00100000
#define CRYPTO_TFM_RES_BAD_KEY_LEN   	0x00200000
#define CRYPTO_TFM_RES_BAD_KEY_SCHED 	0x00400000
#define CRYPTO_TFM_RES_BAD_BLOCK_LEN 	0x00800000
#define CRYPTO_TFM_RES_BAD_FLAGS 	0x01000000

/*
 * Miscellaneous stuff.
 */
#define CRYPTO_MAX_ALG_NAME		64

/*
 * The macro CRYPTO_MINALIGN_ATTR (along with the void * type in the actual
 * declaration) is used to ensure that the crypto_tfm context structure is
 * aligned correctly for the given architecture so that there are no alignment
 * faults for C data types.  In particular, this is required on platforms such
 * as arm where pointers are 32-bit aligned but there are data types such as
 * u64 which require 64-bit alignment.
 */
#if defined(ARCH_KMALLOC_MINALIGN)
#define CRYPTO_MINALIGN ARCH_KMALLOC_MINALIGN
#elif defined(ARCH_SLAB_MINALIGN)
#define CRYPTO_MINALIGN ARCH_SLAB_MINALIGN
#endif

#ifdef CRYPTO_MINALIGN
#define CRYPTO_MINALIGN_ATTR __attribute__ ((__aligned__(CRYPTO_MINALIGN)))
#else
#define CRYPTO_MINALIGN_ATTR
#endif

struct scatterlist;
struct crypto_ablkcipher;
struct crypto_async_request;
struct crypto_aead;
struct crypto_blkcipher;
struct crypto_hash;
struct crypto_tfm;
struct crypto_type;

typedef void (*crypto_completion_t)(struct crypto_async_request *req, int err);

struct crypto_async_request {
	struct list_head list;
	crypto_completion_t complete;
	void *data;
	struct crypto_tfm *tfm;

	u32 flags;
};

struct ablkcipher_request {
	struct crypto_async_request base;

	unsigned int nbytes;

	void *info;

	struct scatterlist *src;
	struct scatterlist *dst;

	void *__ctx[] CRYPTO_MINALIGN_ATTR;
};

/**
 *	struct aead_request - AEAD request
 *	@base: Common attributes for async crypto requests
 *	@assoclen: Length in bytes of associated data for authentication
 *	@cryptlen: Length of data to be encrypted or decrypted
 *	@iv: Initialisation vector
 *	@assoc: Associated data
 *	@src: Source data
 *	@dst: Destination data
 *	@__ctx: Start of private context data
 */
struct aead_request {
	struct crypto_async_request base;

	unsigned int assoclen;
	unsigned int cryptlen;

	u8 *iv;

	struct scatterlist *assoc;
	struct scatterlist *src;
	struct scatterlist *dst;

	void *__ctx[] CRYPTO_MINALIGN_ATTR;
};

struct blkcipher_desc {
	struct crypto_blkcipher *tfm;
	void *info;
	u32 flags;
};

struct cipher_desc {
	struct crypto_tfm *tfm;
	void (*crfn)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
	unsigned int (*prfn)(const struct cipher_desc *desc, u8 *dst,
			     const u8 *src, unsigned int nbytes);
	void *info;
};

struct hash_desc {
	struct crypto_hash *tfm;
	u32 flags;
};

/*
 * Algorithms: modular crypto algorithm implementations, managed
 * via crypto_register_alg() and crypto_unregister_alg().
 */
struct ablkcipher_alg {
	int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
	              unsigned int keylen);
	int (*encrypt)(struct ablkcipher_request *req);
	int (*decrypt)(struct ablkcipher_request *req);

	unsigned int min_keysize;
	unsigned int max_keysize;
	unsigned int ivsize;
};

struct aead_alg {
	int (*setkey)(struct crypto_aead *tfm, const u8 *key,
	              unsigned int keylen);
	int (*encrypt)(struct aead_request *req);
	int (*decrypt)(struct aead_request *req);

	unsigned int ivsize;
	unsigned int authsize;
};

struct blkcipher_alg {
	int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
	              unsigned int keylen);
	int (*encrypt)(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes);
	int (*decrypt)(struct blkcipher_desc *desc,
		       struct scatterlist *dst, struct scatterlist *src,
		       unsigned int nbytes);

	unsigned int min_keysize;
	unsigned int max_keysize;
	unsigned int ivsize;
};

struct cipher_alg {
	unsigned int cia_min_keysize;
	unsigned int cia_max_keysize;
	int (*cia_setkey)(struct crypto_tfm *tfm, const u8 *key,
	                  unsigned int keylen);
	void (*cia_encrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
	void (*cia_decrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
};

struct digest_alg {
	unsigned int dia_digestsize;
	void (*dia_init)(struct crypto_tfm *tfm);
	void (*dia_update)(struct crypto_tfm *tfm, const u8 *data,
			   unsigned int len);
	void (*dia_final)(struct crypto_tfm *tfm, u8 *out);
	int (*dia_setkey)(struct crypto_tfm *tfm, const u8 *key,
	                  unsigned int keylen);
};

struct hash_alg {
	int (*init)(struct hash_desc *desc);
	int (*update)(struct hash_desc *desc, struct scatterlist *sg,
		      unsigned int nbytes);
	int (*final)(struct hash_desc *desc, u8 *out);
	int (*digest)(struct hash_desc *desc, struct scatterlist *sg,
		      unsigned int nbytes, u8 *out);
	int (*setkey)(struct crypto_hash *tfm, const u8 *key,
		      unsigned int keylen);

	unsigned int digestsize;
};

struct compress_alg {
	int (*coa_compress)(struct crypto_tfm *tfm, const u8 *src,
			    unsigned int slen, u8 *dst, unsigned int *dlen);
	int (*coa_decompress)(struct crypto_tfm *tfm, const u8 *src,
			      unsigned int slen, u8 *dst, unsigned int *dlen);
};

#define cra_ablkcipher	cra_u.ablkcipher
#define cra_aead	cra_u.aead
#define cra_blkcipher	cra_u.blkcipher
#define cra_cipher	cra_u.cipher
#define cra_digest	cra_u.digest
#define cra_hash	cra_u.hash
#define cra_compress	cra_u.compress

struct crypto_alg {
	struct list_head cra_list;
	struct list_head cra_users;

	u32 cra_flags;
	unsigned int cra_blocksize;
	unsigned int cra_ctxsize;
	unsigned int cra_alignmask;

	int cra_priority;
	atomic_t cra_refcnt;

	char cra_name[CRYPTO_MAX_ALG_NAME];
	char cra_driver_name[CRYPTO_MAX_ALG_NAME];

	const struct crypto_type *cra_type;

	union {
		struct ablkcipher_alg ablkcipher;
		struct aead_alg aead;
		struct blkcipher_alg blkcipher;
		struct cipher_alg cipher;
		struct digest_alg digest;
		struct hash_alg hash;
		struct compress_alg compress;
	} cra_u;

	int (*cra_init)(struct crypto_tfm *tfm);
	void (*cra_exit)(struct crypto_tfm *tfm);
	void (*cra_destroy)(struct crypto_alg *alg);
	
	struct module *cra_module;
};

/*
 * Algorithm registration interface.
 */
int crypto_register_alg(struct crypto_alg *alg);
int crypto_unregister_alg(struct crypto_alg *alg);

/*
 * Algorithm query interface.
 */
#ifdef CONFIG_CRYPTO
int crypto_has_alg(const char *name, u32 type, u32 mask);
#else
static inline int crypto_has_alg(const char *name, u32 type, u32 mask)
{
	return 0;
}
#endif

/*
 * Transforms: user-instantiated objects which encapsulate algorithms
 * and core processing logic.  Managed via crypto_alloc_*() and
 * crypto_free_*(), as well as the various helpers below.
 */

struct ablkcipher_tfm {
	int (*setkey)(struct crypto_ablkcipher *tfm, const u8 *key,
	              unsigned int keylen);
	int (*encrypt)(struct ablkcipher_request *req);
	int (*decrypt)(struct ablkcipher_request *req);
	unsigned int ivsize;
	unsigned int reqsize;
};

struct aead_tfm {
	int (*setkey)(struct crypto_aead *tfm, const u8 *key,
	              unsigned int keylen);
	int (*encrypt)(struct aead_request *req);
	int (*decrypt)(struct aead_request *req);
	unsigned int ivsize;
	unsigned int authsize;
	unsigned int reqsize;
};

struct blkcipher_tfm {
	void *iv;
	int (*setkey)(struct crypto_tfm *tfm, const u8 *key,
		      unsigned int keylen);
	int (*encrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes);
	int (*decrypt)(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes);
};

struct cipher_tfm {
	int (*cit_setkey)(struct crypto_tfm *tfm,
	                  const u8 *key, unsigned int keylen);
	void (*cit_encrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
	void (*cit_decrypt_one)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
};

struct hash_tfm {
	int (*init)(struct hash_desc *desc);
	int (*update)(struct hash_desc *desc,
		      struct scatterlist *sg, unsigned int nsg);
	int (*final)(struct hash_desc *desc, u8 *out);
	int (*digest)(struct hash_desc *desc, struct scatterlist *sg,
		      unsigned int nsg, u8 *out);
	int (*setkey)(struct crypto_hash *tfm, const u8 *key,
		      unsigned int keylen);
	unsigned int digestsize;
};

struct compress_tfm {
	int (*cot_compress)(struct crypto_tfm *tfm,
	                    const u8 *src, unsigned int slen,
	                    u8 *dst, unsigned int *dlen);
	int (*cot_decompress)(struct crypto_tfm *tfm,
	                      const u8 *src, unsigned int slen,
	                      u8 *dst, unsigned int *dlen);
};

#define crt_ablkcipher	crt_u.ablkcipher
#define crt_aead	crt_u.aead
#define crt_blkcipher	crt_u.blkcipher
#define crt_cipher	crt_u.cipher
#define crt_hash	crt_u.hash
#define crt_compress	crt_u.compress

struct crypto_tfm {

	u32 crt_flags;
	
	union {
		struct ablkcipher_tfm ablkcipher;
		struct aead_tfm aead;
		struct blkcipher_tfm blkcipher;
		struct cipher_tfm cipher;
		struct hash_tfm hash;
		struct compress_tfm compress;
	} crt_u;
	
	struct crypto_alg *__crt_alg;

	void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
};

struct crypto_ablkcipher {
	struct crypto_tfm base;
};

struct crypto_aead {
	struct crypto_tfm base;
};

struct crypto_blkcipher {
	struct crypto_tfm base;
};

struct crypto_cipher {
	struct crypto_tfm base;
};

struct crypto_comp {
	struct crypto_tfm base;
};