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251 lines
7.1 KiB
251 lines
7.1 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Cryptographic API for algorithms (i.e., low-level API). |
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* |
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* Copyright (c) 2006 Herbert Xu <[email protected]> |
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*/ |
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#ifndef _CRYPTO_ALGAPI_H |
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#define _CRYPTO_ALGAPI_H |
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#include <linux/crypto.h> |
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#include <linux/list.h> |
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#include <linux/kernel.h> |
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/* |
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* Maximum values for blocksize and alignmask, used to allocate |
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* static buffers that are big enough for any combination of |
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* algs and architectures. Ciphers have a lower maximum size. |
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*/ |
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#define MAX_ALGAPI_BLOCKSIZE 160 |
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#define MAX_ALGAPI_ALIGNMASK 63 |
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#define MAX_CIPHER_BLOCKSIZE 16 |
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#define MAX_CIPHER_ALIGNMASK 15 |
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struct crypto_aead; |
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struct crypto_instance; |
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struct module; |
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struct rtattr; |
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struct seq_file; |
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struct sk_buff; |
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struct crypto_type { |
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unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask); |
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unsigned int (*extsize)(struct crypto_alg *alg); |
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int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask); |
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int (*init_tfm)(struct crypto_tfm *tfm); |
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void (*show)(struct seq_file *m, struct crypto_alg *alg); |
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int (*report)(struct sk_buff *skb, struct crypto_alg *alg); |
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void (*free)(struct crypto_instance *inst); |
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unsigned int type; |
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unsigned int maskclear; |
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unsigned int maskset; |
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unsigned int tfmsize; |
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}; |
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struct crypto_instance { |
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struct crypto_alg alg; |
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struct crypto_template *tmpl; |
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union { |
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/* Node in list of instances after registration. */ |
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struct hlist_node list; |
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/* List of attached spawns before registration. */ |
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struct crypto_spawn *spawns; |
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}; |
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void *__ctx[] CRYPTO_MINALIGN_ATTR; |
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}; |
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struct crypto_template { |
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struct list_head list; |
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struct hlist_head instances; |
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struct module *module; |
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int (*create)(struct crypto_template *tmpl, struct rtattr **tb); |
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char name[CRYPTO_MAX_ALG_NAME]; |
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}; |
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struct crypto_spawn { |
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struct list_head list; |
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struct crypto_alg *alg; |
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union { |
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/* Back pointer to instance after registration.*/ |
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struct crypto_instance *inst; |
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/* Spawn list pointer prior to registration. */ |
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struct crypto_spawn *next; |
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}; |
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const struct crypto_type *frontend; |
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u32 mask; |
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bool dead; |
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bool registered; |
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}; |
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struct crypto_queue { |
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struct list_head list; |
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struct list_head *backlog; |
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unsigned int qlen; |
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unsigned int max_qlen; |
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}; |
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struct scatter_walk { |
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struct scatterlist *sg; |
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unsigned int offset; |
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}; |
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void crypto_mod_put(struct crypto_alg *alg); |
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int crypto_register_template(struct crypto_template *tmpl); |
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int crypto_register_templates(struct crypto_template *tmpls, int count); |
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void crypto_unregister_template(struct crypto_template *tmpl); |
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void crypto_unregister_templates(struct crypto_template *tmpls, int count); |
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struct crypto_template *crypto_lookup_template(const char *name); |
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int crypto_register_instance(struct crypto_template *tmpl, |
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struct crypto_instance *inst); |
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void crypto_unregister_instance(struct crypto_instance *inst); |
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int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst, |
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const char *name, u32 type, u32 mask); |
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void crypto_drop_spawn(struct crypto_spawn *spawn); |
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struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, |
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u32 mask); |
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void *crypto_spawn_tfm2(struct crypto_spawn *spawn); |
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struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb); |
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int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret); |
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const char *crypto_attr_alg_name(struct rtattr *rta); |
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int crypto_attr_u32(struct rtattr *rta, u32 *num); |
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int crypto_inst_setname(struct crypto_instance *inst, const char *name, |
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struct crypto_alg *alg); |
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void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen); |
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int crypto_enqueue_request(struct crypto_queue *queue, |
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struct crypto_async_request *request); |
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void crypto_enqueue_request_head(struct crypto_queue *queue, |
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struct crypto_async_request *request); |
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struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue); |
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static inline unsigned int crypto_queue_len(struct crypto_queue *queue) |
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{ |
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return queue->qlen; |
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} |
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void crypto_inc(u8 *a, unsigned int size); |
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void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size); |
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static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size) |
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{ |
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if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && |
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__builtin_constant_p(size) && |
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(size % sizeof(unsigned long)) == 0) { |
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unsigned long *d = (unsigned long *)dst; |
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unsigned long *s = (unsigned long *)src; |
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while (size > 0) { |
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*d++ ^= *s++; |
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size -= sizeof(unsigned long); |
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} |
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} else { |
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__crypto_xor(dst, dst, src, size); |
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} |
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} |
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static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2, |
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unsigned int size) |
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{ |
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if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && |
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__builtin_constant_p(size) && |
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(size % sizeof(unsigned long)) == 0) { |
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unsigned long *d = (unsigned long *)dst; |
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unsigned long *s1 = (unsigned long *)src1; |
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unsigned long *s2 = (unsigned long *)src2; |
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while (size > 0) { |
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*d++ = *s1++ ^ *s2++; |
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size -= sizeof(unsigned long); |
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} |
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} else { |
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__crypto_xor(dst, src1, src2, size); |
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} |
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} |
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static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm) |
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{ |
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return PTR_ALIGN(crypto_tfm_ctx(tfm), |
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crypto_tfm_alg_alignmask(tfm) + 1); |
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} |
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static inline struct crypto_instance *crypto_tfm_alg_instance( |
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struct crypto_tfm *tfm) |
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{ |
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return container_of(tfm->__crt_alg, struct crypto_instance, alg); |
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} |
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static inline void *crypto_instance_ctx(struct crypto_instance *inst) |
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{ |
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return inst->__ctx; |
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} |
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static inline struct crypto_async_request *crypto_get_backlog( |
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struct crypto_queue *queue) |
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{ |
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return queue->backlog == &queue->list ? NULL : |
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container_of(queue->backlog, struct crypto_async_request, list); |
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} |
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static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off) |
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{ |
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return (algt->type ^ off) & algt->mask & off; |
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} |
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/* |
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* When an algorithm uses another algorithm (e.g., if it's an instance of a |
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* template), these are the flags that should always be set on the "outer" |
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* algorithm if any "inner" algorithm has them set. |
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*/ |
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#define CRYPTO_ALG_INHERITED_FLAGS \ |
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(CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK | \ |
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CRYPTO_ALG_ALLOCATES_MEMORY) |
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/* |
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* Given the type and mask that specify the flags restrictions on a template |
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* instance being created, return the mask that should be passed to |
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* crypto_grab_*() (along with type=0) to honor any request the user made to |
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* have any of the CRYPTO_ALG_INHERITED_FLAGS clear. |
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*/ |
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static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt) |
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{ |
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return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS); |
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} |
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noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size); |
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/** |
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* crypto_memneq - Compare two areas of memory without leaking |
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* timing information. |
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* |
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* @a: One area of memory |
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* @b: Another area of memory |
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* @size: The size of the area. |
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* |
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* Returns 0 when data is equal, 1 otherwise. |
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*/ |
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static inline int crypto_memneq(const void *a, const void *b, size_t size) |
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{ |
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return __crypto_memneq(a, b, size) != 0UL ? 1 : 0; |
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} |
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int crypto_register_notifier(struct notifier_block *nb); |
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int crypto_unregister_notifier(struct notifier_block *nb); |
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/* Crypto notification events. */ |
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enum { |
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CRYPTO_MSG_ALG_REQUEST, |
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CRYPTO_MSG_ALG_REGISTER, |
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CRYPTO_MSG_ALG_LOADED, |
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}; |
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#endif /* _CRYPTO_ALGAPI_H */
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