| /* 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; |
| } |
| |
| 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 */ |