/* SPDX-License-Identifier: GPL-2.0-or-later *//* * Cryptographic API for algorithms (i.e., low-level API). * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> */#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; 	union {		/* Node in list of instances after registration. */		struct hlist_node list;		/* List of attached spawns before registration. */		struct crypto_spawn *spawns;	}; 	void *__ctx[] CRYPTO_MINALIGN_ATTR;}; struct crypto_template {	struct list_head list;	struct hlist_head instances;	struct module *module; 	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;	union {		/* Back pointer to instance after registration.*/		struct crypto_instance *inst;		/* Spawn list pointer prior to registration. */		struct crypto_spawn *next;	};	const struct crypto_type *frontend;	u32 mask;	bool dead;	bool registered;}; 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;}; 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);void crypto_unregister_instance(struct crypto_instance *inst); int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,		      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); struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret);const char *crypto_attr_alg_name(struct rtattr *rta);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_init_queue(struct crypto_queue *queue, unsigned int max_qlen);int crypto_enqueue_request(struct crypto_queue *queue,			   struct crypto_async_request *request);void crypto_enqueue_request_head(struct crypto_queue *queue,				 struct crypto_async_request *request);struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);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);	}} 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;} struct crypto_cipher_spawn {	struct crypto_spawn base;}; static inline int crypto_grab_cipher(struct crypto_cipher_spawn *spawn,				     struct crypto_instance *inst,				     const char *name, u32 type, u32 mask){	type &= ~CRYPTO_ALG_TYPE_MASK;	type |= CRYPTO_ALG_TYPE_CIPHER;	mask |= CRYPTO_ALG_TYPE_MASK;	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);} static inline void crypto_drop_cipher(struct crypto_cipher_spawn *spawn){	crypto_drop_spawn(&spawn->base);} static inline struct crypto_alg *crypto_spawn_cipher_alg(	struct crypto_cipher_spawn *spawn){	return spawn->base.alg;} static inline struct crypto_cipher *crypto_spawn_cipher(	struct crypto_cipher_spawn *spawn){	u32 type = CRYPTO_ALG_TYPE_CIPHER;	u32 mask = CRYPTO_ALG_TYPE_MASK; 	return __crypto_cipher_cast(crypto_spawn_tfm(&spawn->base, 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_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 u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off){	return (algt->type ^ off) & algt->mask & off;} /* * When an algorithm uses another algorithm (e.g., if it's an instance of a * template), these are the flags that should always be set on the "outer" * algorithm if any "inner" algorithm has them set. */#define CRYPTO_ALG_INHERITED_FLAGS	\	(CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK |	\	 CRYPTO_ALG_ALLOCATES_MEMORY) /* * Given the type and mask that specify the flags restrictions on a template * instance being created, return the mask that should be passed to * crypto_grab_*() (along with type=0) to honor any request the user made to * have any of the CRYPTO_ALG_INHERITED_FLAGS clear. */static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt){	return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS);} 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 (flags & CRYPTO_TFM_REQ_MAY_SLEEP)		cond_resched();} 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 */