/* * 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> 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); struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask); 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); void crypto_unregister_template(struct crypto_template *tmpl); 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_instance2(const char *name, struct crypto_alg *alg, unsigned int head); struct crypto_instance *crypto_alloc_instance(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); 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; } /* These functions require the input/output to be aligned as u32. */ void crypto_inc(u8 *a, unsigned int size); void crypto_xor(u8 *dst, const u8 *src, unsigned int 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); } /* * 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 (type ^ CRYPTO_ALG_ASYNC) & 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 } #endif /* _CRYPTO_ALGAPI_H */