/* * 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>#include <linux/list.h>#include <linux/kernel.h>#include <linux/skbuff.h> /* * Maximum values for blocksize and alignmask, used to allocate * static buffers that are big enough for any combination of * algs and architectures. Ciphers have a lower maximum size. */#define MAX_ALGAPI_BLOCKSIZE		160#define MAX_ALGAPI_ALIGNMASK		63#define MAX_CIPHER_BLOCKSIZE		16#define MAX_CIPHER_ALIGNMASK		15 struct crypto_aead;struct crypto_instance;struct module;struct rtattr;struct seq_file; struct crypto_type {	unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);	unsigned int (*extsize)(struct crypto_alg *alg);	int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);	int (*init_tfm)(struct crypto_tfm *tfm);	void (*show)(struct seq_file *m, struct crypto_alg *alg);	int (*report)(struct sk_buff *skb, struct crypto_alg *alg);	void (*free)(struct crypto_instance *inst); 	unsigned int type;	unsigned int maskclear;	unsigned int maskset;	unsigned int tfmsize;}; 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);	int (*create)(struct crypto_template *tmpl, struct rtattr **tb); 	char name[CRYPTO_MAX_ALG_NAME];}; struct crypto_spawn {	struct list_head list;	struct crypto_alg *alg;	struct crypto_instance *inst;	const struct crypto_type *frontend;	u32 mask;}; struct crypto_queue {	struct list_head list;	struct list_head *backlog; 	unsigned int qlen;	unsigned int max_qlen;}; 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;	unsigned int ivsize; 	int flags;	unsigned int walk_blocksize;	unsigned int cipher_blocksize;	unsigned int alignmask;}; struct ablkcipher_walk {	struct {		struct page *page;		unsigned int offset;	} src, dst; 	struct scatter_walk	in;	unsigned int		nbytes;	struct scatter_walk	out;	unsigned int		total;	struct list_head	buffers;	u8			*iv_buffer;	u8			*iv;	int			flags;	unsigned int		blocksize;}; extern const struct crypto_type crypto_ablkcipher_type;extern const struct crypto_type crypto_blkcipher_type; void crypto_mod_put(struct crypto_alg *alg); int crypto_register_template(struct crypto_template *tmpl);int crypto_register_templates(struct crypto_template *tmpls, int count);void crypto_unregister_template(struct crypto_template *tmpl);void crypto_unregister_templates(struct crypto_template *tmpls, int count);struct crypto_template *crypto_lookup_template(const char *name); int crypto_register_instance(struct crypto_template *tmpl,			     struct crypto_instance *inst);int crypto_unregister_instance(struct crypto_instance *inst); int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,		      struct crypto_instance *inst, u32 mask);int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,		       struct crypto_instance *inst,		       const struct crypto_type *frontend);int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,		      u32 type, u32 mask); void crypto_drop_spawn(struct crypto_spawn *spawn);struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,				    u32 mask);void *crypto_spawn_tfm2(struct crypto_spawn *spawn); static inline void crypto_set_spawn(struct crypto_spawn *spawn,				    struct crypto_instance *inst){	spawn->inst = inst;} struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);int crypto_check_attr_type(struct rtattr **tb, u32 type);const char *crypto_attr_alg_name(struct rtattr *rta);struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,				    const struct crypto_type *frontend,				    u32 type, u32 mask); static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,						 u32 type, u32 mask){	return crypto_attr_alg2(rta, NULL, type, mask);} int crypto_attr_u32(struct rtattr *rta, u32 *num);int crypto_inst_setname(struct crypto_instance *inst, const char *name,			struct crypto_alg *alg);void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,			    unsigned int head); void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);int crypto_enqueue_request(struct crypto_queue *queue,			   struct crypto_async_request *request);struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);static inline unsigned int crypto_queue_len(struct crypto_queue *queue){	return queue->qlen;} void crypto_inc(u8 *a, unsigned int size);void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size); static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size){	if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&	    __builtin_constant_p(size) &&	    (size % sizeof(unsigned long)) == 0) {		unsigned long *d = (unsigned long *)dst;		unsigned long *s = (unsigned long *)src; 		while (size > 0) {			*d++ ^= *s++;			size -= sizeof(unsigned long);		}	} else {		__crypto_xor(dst, dst, src, size);	}} static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,				  unsigned int size){	if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&	    __builtin_constant_p(size) &&	    (size % sizeof(unsigned long)) == 0) {		unsigned long *d = (unsigned long *)dst;		unsigned long *s1 = (unsigned long *)src1;		unsigned long *s2 = (unsigned long *)src2; 		while (size > 0) {			*d++ = *s1++ ^ *s2++;			size -= sizeof(unsigned long);		}	} else {		__crypto_xor(dst, src1, src2, size);	}} 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);int blkcipher_walk_virt_block(struct blkcipher_desc *desc,			      struct blkcipher_walk *walk,			      unsigned int blocksize);int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,				   struct blkcipher_walk *walk,				   struct crypto_aead *tfm,				   unsigned int blocksize); int ablkcipher_walk_done(struct ablkcipher_request *req,			 struct ablkcipher_walk *walk, int err);int ablkcipher_walk_phys(struct ablkcipher_request *req,			 struct ablkcipher_walk *walk);void __ablkcipher_walk_complete(struct ablkcipher_walk *walk); static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm){	return PTR_ALIGN(crypto_tfm_ctx(tfm),			 crypto_tfm_alg_alignmask(tfm) + 1);} static inline struct crypto_instance *crypto_tfm_alg_instance(	struct crypto_tfm *tfm){	return container_of(tfm->__crt_alg, struct crypto_instance, alg);} static inline void *crypto_instance_ctx(struct crypto_instance *inst){	return inst->__ctx;} static inline struct ablkcipher_alg *crypto_ablkcipher_alg(	struct crypto_ablkcipher *tfm){	return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;} static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm){	return crypto_tfm_ctx(&tfm->base);} static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm){	return crypto_tfm_ctx_aligned(&tfm->base);} static inline struct crypto_blkcipher *crypto_spawn_blkcipher(	struct crypto_spawn *spawn){	u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;	u32 mask = CRYPTO_ALG_TYPE_MASK; 	return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));} 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 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;} static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,					struct scatterlist *dst,					struct scatterlist *src,					unsigned int nbytes){	walk->in.sg = src;	walk->out.sg = dst;	walk->total = nbytes;	INIT_LIST_HEAD(&walk->buffers);} static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk){	if (unlikely(!list_empty(&walk->buffers)))		__ablkcipher_walk_complete(walk);} static inline struct crypto_async_request *crypto_get_backlog(	struct crypto_queue *queue){	return queue->backlog == &queue->list ? NULL :	       container_of(queue->backlog, struct crypto_async_request, list);} static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,					     struct ablkcipher_request *request){	return crypto_enqueue_request(queue, &request->base);} static inline struct ablkcipher_request *ablkcipher_dequeue_request(	struct crypto_queue *queue){	return ablkcipher_request_cast(crypto_dequeue_request(queue));} static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req){	return req->__ctx;} static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,					  struct crypto_ablkcipher *tfm){	return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));} static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,						     u32 type, u32 mask){	return crypto_attr_alg(tb[1], type, mask);} static inline int crypto_requires_off(u32 type, u32 mask, u32 off){	return (type ^ off) & mask & off;} /* * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms. * Otherwise returns zero. */static inline int crypto_requires_sync(u32 type, u32 mask){	return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);} noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size); /** * crypto_memneq - Compare two areas of memory without leaking *		   timing information. * * @a: One area of memory * @b: Another area of memory * @size: The size of the area. * * Returns 0 when data is equal, 1 otherwise. */static inline int crypto_memneq(const void *a, const void *b, size_t size){	return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;} static inline void crypto_yield(u32 flags){#if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY)	if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)		cond_resched();#endif} int crypto_register_notifier(struct notifier_block *nb);int crypto_unregister_notifier(struct notifier_block *nb); /* Crypto notification events. */enum {	CRYPTO_MSG_ALG_REQUEST,	CRYPTO_MSG_ALG_REGISTER,	CRYPTO_MSG_ALG_LOADED,}; #endif	/* _CRYPTO_ALGAPI_H */