1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Cryptographic API for algorithms (i.e., low-level API).
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
7 #ifndef _CRYPTO_ALGAPI_H
8 #define _CRYPTO_ALGAPI_H
10 #include <crypto/utils.h>
11 #include <linux/align.h>
12 #include <linux/cache.h>
13 #include <linux/crypto.h>
14 #include <linux/types.h>
17 * Maximum values for blocksize and alignmask, used to allocate
18 * static buffers that are big enough for any combination of
19 * algs and architectures. Ciphers have a lower maximum size.
21 #define MAX_ALGAPI_BLOCKSIZE 160
22 #define MAX_ALGAPI_ALIGNMASK 127
23 #define MAX_CIPHER_BLOCKSIZE 16
24 #define MAX_CIPHER_ALIGNMASK 15
26 #ifdef ARCH_DMA_MINALIGN
27 #define CRYPTO_DMA_ALIGN ARCH_DMA_MINALIGN
29 #define CRYPTO_DMA_ALIGN CRYPTO_MINALIGN
32 #define CRYPTO_DMA_PADDING ((CRYPTO_DMA_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1))
35 * Autoloaded crypto modules should only use a prefixed name to avoid allowing
36 * arbitrary modules to be loaded. Loading from userspace may still need the
37 * unprefixed names, so retains those aliases as well.
38 * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3
39 * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro
40 * expands twice on the same line. Instead, use a separate base name for the
43 #define MODULE_ALIAS_CRYPTO(name) \
44 __MODULE_INFO(alias, alias_userspace, name); \
45 __MODULE_INFO(alias, alias_crypto, "crypto-" name)
48 struct crypto_instance;
50 struct notifier_block;
57 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
58 unsigned int (*extsize)(struct crypto_alg *alg);
59 int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
60 int (*init_tfm)(struct crypto_tfm *tfm);
61 void (*show)(struct seq_file *m, struct crypto_alg *alg);
62 int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
63 void (*free)(struct crypto_instance *inst);
64 #ifdef CONFIG_CRYPTO_STATS
65 int (*report_stat)(struct sk_buff *skb, struct crypto_alg *alg);
69 unsigned int maskclear;
74 struct crypto_instance {
75 struct crypto_alg alg;
77 struct crypto_template *tmpl;
80 /* Node in list of instances after registration. */
81 struct hlist_node list;
82 /* List of attached spawns before registration. */
83 struct crypto_spawn *spawns;
86 void *__ctx[] CRYPTO_MINALIGN_ATTR;
89 struct crypto_template {
90 struct list_head list;
91 struct hlist_head instances;
92 struct module *module;
94 int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
96 char name[CRYPTO_MAX_ALG_NAME];
100 struct list_head list;
101 struct crypto_alg *alg;
103 /* Back pointer to instance after registration.*/
104 struct crypto_instance *inst;
105 /* Spawn list pointer prior to registration. */
106 struct crypto_spawn *next;
108 const struct crypto_type *frontend;
114 struct crypto_queue {
115 struct list_head list;
116 struct list_head *backlog;
119 unsigned int max_qlen;
122 struct scatter_walk {
123 struct scatterlist *sg;
127 struct crypto_attr_alg {
128 char name[CRYPTO_MAX_ALG_NAME];
131 struct crypto_attr_type {
137 * Algorithm registration interface.
139 int crypto_register_alg(struct crypto_alg *alg);
140 void crypto_unregister_alg(struct crypto_alg *alg);
141 int crypto_register_algs(struct crypto_alg *algs, int count);
142 void crypto_unregister_algs(struct crypto_alg *algs, int count);
144 void crypto_mod_put(struct crypto_alg *alg);
146 int crypto_register_template(struct crypto_template *tmpl);
147 int crypto_register_templates(struct crypto_template *tmpls, int count);
148 void crypto_unregister_template(struct crypto_template *tmpl);
149 void crypto_unregister_templates(struct crypto_template *tmpls, int count);
150 struct crypto_template *crypto_lookup_template(const char *name);
152 int crypto_register_instance(struct crypto_template *tmpl,
153 struct crypto_instance *inst);
154 void crypto_unregister_instance(struct crypto_instance *inst);
156 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
157 const char *name, u32 type, u32 mask);
158 void crypto_drop_spawn(struct crypto_spawn *spawn);
159 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
161 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
163 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
164 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret);
165 const char *crypto_attr_alg_name(struct rtattr *rta);
166 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
167 struct crypto_alg *alg);
169 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
170 int crypto_enqueue_request(struct crypto_queue *queue,
171 struct crypto_async_request *request);
172 void crypto_enqueue_request_head(struct crypto_queue *queue,
173 struct crypto_async_request *request);
174 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
175 static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
180 void crypto_inc(u8 *a, unsigned int size);
182 static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
184 return tfm->__crt_ctx;
187 static inline void *crypto_tfm_ctx_align(struct crypto_tfm *tfm,
190 if (align <= crypto_tfm_ctx_alignment())
193 return PTR_ALIGN(crypto_tfm_ctx(tfm), align);
196 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
198 return crypto_tfm_ctx_align(tfm, crypto_tfm_alg_alignmask(tfm) + 1);
201 static inline unsigned int crypto_dma_align(void)
203 return CRYPTO_DMA_ALIGN;
206 static inline unsigned int crypto_dma_padding(void)
208 return (crypto_dma_align() - 1) & ~(crypto_tfm_ctx_alignment() - 1);
211 static inline void *crypto_tfm_ctx_dma(struct crypto_tfm *tfm)
213 return crypto_tfm_ctx_align(tfm, crypto_dma_align());
216 static inline struct crypto_instance *crypto_tfm_alg_instance(
217 struct crypto_tfm *tfm)
219 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
222 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
227 static inline struct crypto_async_request *crypto_get_backlog(
228 struct crypto_queue *queue)
230 return queue->backlog == &queue->list ? NULL :
231 container_of(queue->backlog, struct crypto_async_request, list);
234 static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off)
236 return (algt->type ^ off) & algt->mask & off;
240 * When an algorithm uses another algorithm (e.g., if it's an instance of a
241 * template), these are the flags that should always be set on the "outer"
242 * algorithm if any "inner" algorithm has them set.
244 #define CRYPTO_ALG_INHERITED_FLAGS \
245 (CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK | \
246 CRYPTO_ALG_ALLOCATES_MEMORY)
249 * Given the type and mask that specify the flags restrictions on a template
250 * instance being created, return the mask that should be passed to
251 * crypto_grab_*() (along with type=0) to honor any request the user made to
252 * have any of the CRYPTO_ALG_INHERITED_FLAGS clear.
254 static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt)
256 return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS);
259 int crypto_register_notifier(struct notifier_block *nb);
260 int crypto_unregister_notifier(struct notifier_block *nb);
262 /* Crypto notification events. */
264 CRYPTO_MSG_ALG_REQUEST,
265 CRYPTO_MSG_ALG_REGISTER,
266 CRYPTO_MSG_ALG_LOADED,
269 static inline void crypto_request_complete(struct crypto_async_request *req,
272 req->complete(req->data, err);
275 static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
277 return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
280 #endif /* _CRYPTO_ALGAPI_H */