include/linux/crypto.h - arm/linux-arm64-legacy - Git at Google

 /*
  * Scatterlist Cryptographic API.
  *
  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
  * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
  *
  * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
  * 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/types.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_COMPRESS	0x00000004

 #define CRYPTO_ALG_LARVAL		0x00000010

 /*
  * Transform masks and values (for crt_flags).
  */
 #define CRYPTO_TFM_MODE_MASK		0x000000ff
 #define CRYPTO_TFM_REQ_MASK		0x000fff00
 #define CRYPTO_TFM_RES_MASK		0xfff00000

 #define CRYPTO_TFM_MODE_ECB		0x00000001
 #define CRYPTO_TFM_MODE_CBC		0x00000002
 #define CRYPTO_TFM_MODE_CFB		0x00000004
 #define CRYPTO_TFM_MODE_CTR		0x00000008

 #define CRYPTO_TFM_REQ_WEAK_KEY		0x00000100
 #define CRYPTO_TFM_REQ_MAY_SLEEP	0x00000200
 #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_UNSPEC			0
 #define CRYPTO_MAX_ALG_NAME		64

 #define CRYPTO_DIR_ENCRYPT		1
 #define CRYPTO_DIR_DECRYPT		0

 /*
  * 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_tfm;

 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;
 };

 /*
  * Algorithms: modular crypto algorithm implementations, managed
  * via crypto_register_alg() and crypto_unregister_alg().
  */
 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, u32 *flags);
 	void (*cia_encrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);
 	void (*cia_decrypt)(struct crypto_tfm *tfm, u8 *dst, const u8 *src);

 	unsigned int (*cia_encrypt_ecb)(const struct cipher_desc *desc,
 					u8 *dst, const u8 *src,
 					unsigned int nbytes);
 	unsigned int (*cia_decrypt_ecb)(const struct cipher_desc *desc,
 					u8 *dst, const u8 *src,
 					unsigned int nbytes);
 	unsigned int (*cia_encrypt_cbc)(const struct cipher_desc *desc,
 					u8 *dst, const u8 *src,
 					unsigned int nbytes);
 	unsigned int (*cia_decrypt_cbc)(const struct cipher_desc *desc,
 					u8 *dst, const u8 *src,
 					unsigned int nbytes);
 };

 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, u32 *flags);
 };

 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_cipher	cra_u.cipher
 #define cra_digest	cra_u.digest
 #define cra_compress	cra_u.compress

 struct crypto_alg {
 	struct list_head cra_list;
 	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];

 	union {
 		struct cipher_alg cipher;
 		struct digest_alg digest;
 		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_alg_available(const char *name, u32 flags);
 #else
 static inline int crypto_alg_available(const char *name, u32 flags)
 {
 	return 0;
 }
 #endif

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

 struct cipher_tfm {
 	void *cit_iv;
 	unsigned int cit_ivsize;
 	u32 cit_mode;
 	int (*cit_setkey)(struct crypto_tfm *tfm,
 	                  const u8 *key, unsigned int keylen);
 	int (*cit_encrypt)(struct crypto_tfm *tfm,
 			   struct scatterlist *dst,
 			   struct scatterlist *src,
 			   unsigned int nbytes);
 	int (*cit_encrypt_iv)(struct crypto_tfm *tfm,
 	                      struct scatterlist *dst,
 	                      struct scatterlist *src,
 	                      unsigned int nbytes, u8 *iv);
 	int (*cit_decrypt)(struct crypto_tfm *tfm,
 			   struct scatterlist *dst,
 			   struct scatterlist *src,
 			   unsigned int nbytes);
 	int (*cit_decrypt_iv)(struct crypto_tfm *tfm,
 			   struct scatterlist *dst,
 			   struct scatterlist *src,
 			   unsigned int nbytes, u8 *iv);
 	void (*cit_xor_block)(u8 *dst, const u8 *src);
 };

 struct digest_tfm {
 	void (*dit_init)(struct crypto_tfm *tfm);
 	void (*dit_update)(struct crypto_tfm *tfm,
 	                   struct scatterlist *sg, unsigned int nsg);
 	void (*dit_final)(struct crypto_tfm *tfm, u8 *out);
 	void (*dit_digest)(struct crypto_tfm *tfm, struct scatterlist *sg,
 	                   unsigned int nsg, u8 *out);
 	int (*dit_setkey)(struct crypto_tfm *tfm,
 	                  const u8 *key, unsigned int keylen);
 #ifdef CONFIG_CRYPTO_HMAC
 	void *dit_hmac_block;
 #endif
 };

 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_cipher	crt_u.cipher
 #define crt_digest	crt_u.digest
 #define crt_compress	crt_u.compress

 struct crypto_tfm {

 	u32 crt_flags;

 	union {
 		struct cipher_tfm cipher;
 		struct digest_tfm digest;
 		struct compress_tfm compress;
 	} crt_u;

 	struct crypto_alg *__crt_alg;

 	void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
 };

 enum {
 	CRYPTOA_UNSPEC,
 	CRYPTOA_ALG,
 };

 struct crypto_attr_alg {
 	char name[CRYPTO_MAX_ALG_NAME];
 };

 /*
  * Transform user interface.
  */

 /*
  * crypto_alloc_tfm() will first attempt to locate an already loaded algorithm.
  * If that fails and the kernel supports dynamically loadable modules, it
  * will then attempt to load a module of the same name or alias.  A refcount
  * is grabbed on the algorithm which is then associated with the new transform.
  *
  * crypto_free_tfm() frees up the transform and any associated resources,
  * then drops the refcount on the associated algorithm.
  */
 struct crypto_tfm *crypto_alloc_tfm(const char *alg_name, u32 tfm_flags);
 void crypto_free_tfm(struct crypto_tfm *tfm);

 /*
  * Transform helpers which query the underlying algorithm.
  */
 static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm)
 {
 	return tfm->__crt_alg->cra_name;
 }

 static inline const char *crypto_tfm_alg_modname(struct crypto_tfm *tfm)
 {
 	return module_name(tfm->__crt_alg->cra_module);
 }

 static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
 {
 	return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
 }

 static inline unsigned int crypto_tfm_alg_min_keysize(struct crypto_tfm *tfm)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	return tfm->__crt_alg->cra_cipher.cia_min_keysize;
 }

 static inline unsigned int crypto_tfm_alg_max_keysize(struct crypto_tfm *tfm)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	return tfm->__crt_alg->cra_cipher.cia_max_keysize;
 }

 static inline unsigned int crypto_tfm_alg_ivsize(struct crypto_tfm *tfm)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	return tfm->crt_cipher.cit_ivsize;
 }

 static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
 {
 	return tfm->__crt_alg->cra_blocksize;
 }

 static inline unsigned int crypto_tfm_alg_digestsize(struct crypto_tfm *tfm)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 	return tfm->__crt_alg->cra_digest.dia_digestsize;
 }

 static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
 {
 	return tfm->__crt_alg->cra_alignmask;
 }

 static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
 {
 	return tfm->__crt_ctx;
 }

 static inline unsigned int crypto_tfm_ctx_alignment(void)
 {
 	struct crypto_tfm *tfm;
 	return __alignof__(tfm->__crt_ctx);
 }

 /*
  * API wrappers.
  */
 static inline void crypto_digest_init(struct crypto_tfm *tfm)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 	tfm->crt_digest.dit_init(tfm);
 }

 static inline void crypto_digest_update(struct crypto_tfm *tfm,
                                         struct scatterlist *sg,
                                         unsigned int nsg)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 	tfm->crt_digest.dit_update(tfm, sg, nsg);
 }

 static inline void crypto_digest_final(struct crypto_tfm *tfm, u8 *out)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 	tfm->crt_digest.dit_final(tfm, out);
 }

 static inline void crypto_digest_digest(struct crypto_tfm *tfm,
                                         struct scatterlist *sg,
                                         unsigned int nsg, u8 *out)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 	tfm->crt_digest.dit_digest(tfm, sg, nsg, out);
 }

 static inline int crypto_digest_setkey(struct crypto_tfm *tfm,
                                        const u8 *key, unsigned int keylen)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 	if (tfm->crt_digest.dit_setkey == NULL)
 		return -ENOSYS;
 	return tfm->crt_digest.dit_setkey(tfm, key, keylen);
 }

 static inline int crypto_cipher_setkey(struct crypto_tfm *tfm,
                                        const u8 *key, unsigned int keylen)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	return tfm->crt_cipher.cit_setkey(tfm, key, keylen);
 }

 static inline int crypto_cipher_encrypt(struct crypto_tfm *tfm,
                                         struct scatterlist *dst,
                                         struct scatterlist *src,
                                         unsigned int nbytes)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	return tfm->crt_cipher.cit_encrypt(tfm, dst, src, nbytes);
 }

 static inline int crypto_cipher_encrypt_iv(struct crypto_tfm *tfm,
                                            struct scatterlist *dst,
                                            struct scatterlist *src,
                                            unsigned int nbytes, u8 *iv)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
 	return tfm->crt_cipher.cit_encrypt_iv(tfm, dst, src, nbytes, iv);
 }

 static inline int crypto_cipher_decrypt(struct crypto_tfm *tfm,
                                         struct scatterlist *dst,
                                         struct scatterlist *src,
                                         unsigned int nbytes)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	return tfm->crt_cipher.cit_decrypt(tfm, dst, src, nbytes);
 }

 static inline int crypto_cipher_decrypt_iv(struct crypto_tfm *tfm,
                                            struct scatterlist *dst,
                                            struct scatterlist *src,
                                            unsigned int nbytes, u8 *iv)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
 	return tfm->crt_cipher.cit_decrypt_iv(tfm, dst, src, nbytes, iv);
 }

 static inline void crypto_cipher_set_iv(struct crypto_tfm *tfm,
                                         const u8 *src, unsigned int len)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	memcpy(tfm->crt_cipher.cit_iv, src, len);
 }

 static inline void crypto_cipher_get_iv(struct crypto_tfm *tfm,
                                         u8 *dst, unsigned int len)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 	memcpy(dst, tfm->crt_cipher.cit_iv, len);
 }

 static inline int crypto_comp_compress(struct crypto_tfm *tfm,
                                        const u8 *src, unsigned int slen,
                                        u8 *dst, unsigned int *dlen)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
 	return tfm->crt_compress.cot_compress(tfm, src, slen, dst, dlen);
 }

 static inline int crypto_comp_decompress(struct crypto_tfm *tfm,
                                          const u8 *src, unsigned int slen,
                                          u8 *dst, unsigned int *dlen)
 {
 	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
 	return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen);
 }

 /*
  * HMAC support.
  */
 #ifdef CONFIG_CRYPTO_HMAC
 void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen);
 void crypto_hmac_update(struct crypto_tfm *tfm,
                         struct scatterlist *sg, unsigned int nsg);
 void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key,
                        unsigned int *keylen, u8 *out);
 void crypto_hmac(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen,
                  struct scatterlist *sg, unsigned int nsg, u8 *out);
 #endif	/* CONFIG_CRYPTO_HMAC */

 #endif	/* _LINUX_CRYPTO_H */
	/*
	* Scatterlist Cryptographic API.
	*
	* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
	* Copyright (c) 2002 David S. Miller (davem@redhat.com)
	* Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au>
	*
	* Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
	* 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/types.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_COMPRESS 0x00000004

	#define CRYPTO_ALG_LARVAL 0x00000010

	/*
	* Transform masks and values (for crt_flags).
	*/
	#define CRYPTO_TFM_MODE_MASK 0x000000ff
	#define CRYPTO_TFM_REQ_MASK 0x000fff00
	#define CRYPTO_TFM_RES_MASK 0xfff00000

	#define CRYPTO_TFM_MODE_ECB 0x00000001
	#define CRYPTO_TFM_MODE_CBC 0x00000002
	#define CRYPTO_TFM_MODE_CFB 0x00000004
	#define CRYPTO_TFM_MODE_CTR 0x00000008

	#define CRYPTO_TFM_REQ_WEAK_KEY 0x00000100
	#define CRYPTO_TFM_REQ_MAY_SLEEP 0x00000200
	#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_UNSPEC 0
	#define CRYPTO_MAX_ALG_NAME 64

	#define CRYPTO_DIR_ENCRYPT 1
	#define CRYPTO_DIR_DECRYPT 0

	/*
	* 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_tfm;

	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;
	};

	/*
	* Algorithms: modular crypto algorithm implementations, managed
	* via crypto_register_alg() and crypto_unregister_alg().
	*/
	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, u32 *flags);
	void (cia_encrypt)(struct crypto_tfm tfm, u8 dst, const u8 src);
	void (cia_decrypt)(struct crypto_tfm tfm, u8 dst, const u8 src);

	unsigned int (cia_encrypt_ecb)(const struct cipher_desc desc,
	u8 dst, const u8 src,
	unsigned int nbytes);
	unsigned int (cia_decrypt_ecb)(const struct cipher_desc desc,
	u8 dst, const u8 src,
	unsigned int nbytes);
	unsigned int (cia_encrypt_cbc)(const struct cipher_desc desc,
	u8 dst, const u8 src,
	unsigned int nbytes);
	unsigned int (cia_decrypt_cbc)(const struct cipher_desc desc,
	u8 dst, const u8 src,
	unsigned int nbytes);
	};

	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, u32 *flags);
	};

	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_cipher cra_u.cipher
	#define cra_digest cra_u.digest
	#define cra_compress cra_u.compress

	struct crypto_alg {
	struct list_head cra_list;
	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];

	union {
	struct cipher_alg cipher;
	struct digest_alg digest;
	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_alg_available(const char *name, u32 flags);
	#else
	static inline int crypto_alg_available(const char *name, u32 flags)
	{
	return 0;
	}
	#endif

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

	struct cipher_tfm {
	void *cit_iv;
	unsigned int cit_ivsize;
	u32 cit_mode;
	int (cit_setkey)(struct crypto_tfm tfm,
	const u8 *key, unsigned int keylen);
	int (cit_encrypt)(struct crypto_tfm tfm,
	struct scatterlist *dst,
	struct scatterlist *src,
	unsigned int nbytes);
	int (cit_encrypt_iv)(struct crypto_tfm tfm,
	struct scatterlist *dst,
	struct scatterlist *src,
	unsigned int nbytes, u8 *iv);
	int (cit_decrypt)(struct crypto_tfm tfm,
	struct scatterlist *dst,
	struct scatterlist *src,
	unsigned int nbytes);
	int (cit_decrypt_iv)(struct crypto_tfm tfm,
	struct scatterlist *dst,
	struct scatterlist *src,
	unsigned int nbytes, u8 *iv);
	void (cit_xor_block)(u8 dst, const u8 *src);
	};

	struct digest_tfm {
	void (dit_init)(struct crypto_tfm tfm);
	void (dit_update)(struct crypto_tfm tfm,
	struct scatterlist *sg, unsigned int nsg);
	void (dit_final)(struct crypto_tfm tfm, u8 *out);
	void (dit_digest)(struct crypto_tfm tfm, struct scatterlist *sg,
	unsigned int nsg, u8 *out);
	int (dit_setkey)(struct crypto_tfm tfm,
	const u8 *key, unsigned int keylen);
	#ifdef CONFIG_CRYPTO_HMAC
	void *dit_hmac_block;
	#endif
	};

	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_cipher crt_u.cipher
	#define crt_digest crt_u.digest
	#define crt_compress crt_u.compress

	struct crypto_tfm {

	u32 crt_flags;

	union {
	struct cipher_tfm cipher;
	struct digest_tfm digest;
	struct compress_tfm compress;
	} crt_u;

	struct crypto_alg *__crt_alg;

	void *__crt_ctx[] CRYPTO_MINALIGN_ATTR;
	};

	enum {
	CRYPTOA_UNSPEC,
	CRYPTOA_ALG,
	};

	struct crypto_attr_alg {
	char name[CRYPTO_MAX_ALG_NAME];
	};

	/*
	* Transform user interface.
	*/

	/*
	* crypto_alloc_tfm() will first attempt to locate an already loaded algorithm.
	* If that fails and the kernel supports dynamically loadable modules, it
	* will then attempt to load a module of the same name or alias. A refcount
	* is grabbed on the algorithm which is then associated with the new transform.
	*
	* crypto_free_tfm() frees up the transform and any associated resources,
	* then drops the refcount on the associated algorithm.
	*/
	struct crypto_tfm crypto_alloc_tfm(const char alg_name, u32 tfm_flags);
	void crypto_free_tfm(struct crypto_tfm *tfm);

	/*
	* Transform helpers which query the underlying algorithm.
	*/
	static inline const char crypto_tfm_alg_name(struct crypto_tfm tfm)
	{
	return tfm->__crt_alg->cra_name;
	}

	static inline const char crypto_tfm_alg_modname(struct crypto_tfm tfm)
	{
	return module_name(tfm->__crt_alg->cra_module);
	}

	static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
	{
	return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
	}

	static inline unsigned int crypto_tfm_alg_min_keysize(struct crypto_tfm *tfm)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	return tfm->__crt_alg->cra_cipher.cia_min_keysize;
	}

	static inline unsigned int crypto_tfm_alg_max_keysize(struct crypto_tfm *tfm)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	return tfm->__crt_alg->cra_cipher.cia_max_keysize;
	}

	static inline unsigned int crypto_tfm_alg_ivsize(struct crypto_tfm *tfm)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	return tfm->crt_cipher.cit_ivsize;
	}

	static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
	{
	return tfm->__crt_alg->cra_blocksize;
	}

	static inline unsigned int crypto_tfm_alg_digestsize(struct crypto_tfm *tfm)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
	return tfm->__crt_alg->cra_digest.dia_digestsize;
	}

	static inline unsigned int crypto_tfm_alg_alignmask(struct crypto_tfm *tfm)
	{
	return tfm->__crt_alg->cra_alignmask;
	}

	static inline void crypto_tfm_ctx(struct crypto_tfm tfm)
	{
	return tfm->__crt_ctx;
	}

	static inline unsigned int crypto_tfm_ctx_alignment(void)
	{
	struct crypto_tfm *tfm;
	return __alignof__(tfm->__crt_ctx);
	}

	/*
	* API wrappers.
	*/
	static inline void crypto_digest_init(struct crypto_tfm *tfm)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
	tfm->crt_digest.dit_init(tfm);
	}

	static inline void crypto_digest_update(struct crypto_tfm *tfm,
	struct scatterlist *sg,
	unsigned int nsg)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
	tfm->crt_digest.dit_update(tfm, sg, nsg);
	}

	static inline void crypto_digest_final(struct crypto_tfm tfm, u8 out)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
	tfm->crt_digest.dit_final(tfm, out);
	}

	static inline void crypto_digest_digest(struct crypto_tfm *tfm,
	struct scatterlist *sg,
	unsigned int nsg, u8 *out)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
	tfm->crt_digest.dit_digest(tfm, sg, nsg, out);
	}

	static inline int crypto_digest_setkey(struct crypto_tfm *tfm,
	const u8 *key, unsigned int keylen)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
	if (tfm->crt_digest.dit_setkey == NULL)
	return -ENOSYS;
	return tfm->crt_digest.dit_setkey(tfm, key, keylen);
	}

	static inline int crypto_cipher_setkey(struct crypto_tfm *tfm,
	const u8 *key, unsigned int keylen)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	return tfm->crt_cipher.cit_setkey(tfm, key, keylen);
	}

	static inline int crypto_cipher_encrypt(struct crypto_tfm *tfm,
	struct scatterlist *dst,
	struct scatterlist *src,
	unsigned int nbytes)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	return tfm->crt_cipher.cit_encrypt(tfm, dst, src, nbytes);
	}

	static inline int crypto_cipher_encrypt_iv(struct crypto_tfm *tfm,
	struct scatterlist *dst,
	struct scatterlist *src,
	unsigned int nbytes, u8 *iv)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
	return tfm->crt_cipher.cit_encrypt_iv(tfm, dst, src, nbytes, iv);
	}

	static inline int crypto_cipher_decrypt(struct crypto_tfm *tfm,
	struct scatterlist *dst,
	struct scatterlist *src,
	unsigned int nbytes)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	return tfm->crt_cipher.cit_decrypt(tfm, dst, src, nbytes);
	}

	static inline int crypto_cipher_decrypt_iv(struct crypto_tfm *tfm,
	struct scatterlist *dst,
	struct scatterlist *src,
	unsigned int nbytes, u8 *iv)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
	return tfm->crt_cipher.cit_decrypt_iv(tfm, dst, src, nbytes, iv);
	}

	static inline void crypto_cipher_set_iv(struct crypto_tfm *tfm,
	const u8 *src, unsigned int len)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	memcpy(tfm->crt_cipher.cit_iv, src, len);
	}

	static inline void crypto_cipher_get_iv(struct crypto_tfm *tfm,
	u8 *dst, unsigned int len)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
	memcpy(dst, tfm->crt_cipher.cit_iv, len);
	}

	static inline int crypto_comp_compress(struct crypto_tfm *tfm,
	const u8 *src, unsigned int slen,
	u8 dst, unsigned int dlen)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
	return tfm->crt_compress.cot_compress(tfm, src, slen, dst, dlen);
	}

	static inline int crypto_comp_decompress(struct crypto_tfm *tfm,
	const u8 *src, unsigned int slen,
	u8 dst, unsigned int dlen)
	{
	BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
	return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen);
	}

	/*
	* HMAC support.
	*/
	#ifdef CONFIG_CRYPTO_HMAC
	void crypto_hmac_init(struct crypto_tfm tfm, u8 key, unsigned int *keylen);
	void crypto_hmac_update(struct crypto_tfm *tfm,
	struct scatterlist *sg, unsigned int nsg);
	void crypto_hmac_final(struct crypto_tfm tfm, u8 key,
	unsigned int keylen, u8 out);
	void crypto_hmac(struct crypto_tfm tfm, u8 key, unsigned int *keylen,
	struct scatterlist sg, unsigned int nsg, u8 out);
	#endif /* CONFIG_CRYPTO_HMAC */

	#endif /* _LINUX_CRYPTO_H */