263 lines
7.2 KiB
C
263 lines
7.2 KiB
C
/* 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 <herbert@gondor.apana.org.au>
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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/align.h>
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#include <linux/crypto.h>
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#include <linux/kconfig.h>
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#include <linux/list.h>
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#include <linux/types.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 notifier_block;
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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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struct crypto_attr_alg {
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char name[CRYPTO_MAX_ALG_NAME];
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};
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struct crypto_attr_type {
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u32 type;
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u32 mask;
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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_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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