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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7#ifndef _CRYPTO_ALGAPI_H
8#define _CRYPTO_ALGAPI_H
9
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>
15#include <linux/workqueue.h>
16
17/*
18 * Maximum values for blocksize and alignmask, used to allocate
19 * static buffers that are big enough for any combination of
20 * algs and architectures. Ciphers have a lower maximum size.
21 */
22#define MAX_ALGAPI_BLOCKSIZE 160
23#define MAX_ALGAPI_ALIGNMASK 127
24#define MAX_CIPHER_BLOCKSIZE 16
25#define MAX_CIPHER_ALIGNMASK 15
26
27#ifdef ARCH_DMA_MINALIGN
28#define CRYPTO_DMA_ALIGN ARCH_DMA_MINALIGN
29#else
30#define CRYPTO_DMA_ALIGN CRYPTO_MINALIGN
31#endif
32
33#define CRYPTO_DMA_PADDING ((CRYPTO_DMA_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1))
34
35/*
36 * Autoloaded crypto modules should only use a prefixed name to avoid allowing
37 * arbitrary modules to be loaded. Loading from userspace may still need the
38 * unprefixed names, so retains those aliases as well.
39 * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3
40 * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro
41 * expands twice on the same line. Instead, use a separate base name for the
42 * alias.
43 */
44#define MODULE_ALIAS_CRYPTO(name) \
45 __MODULE_INFO(alias, alias_userspace, name); \
46 __MODULE_INFO(alias, alias_crypto, "crypto-" name)
47
48struct crypto_aead;
49struct crypto_instance;
50struct module;
51struct notifier_block;
52struct rtattr;
53struct scatterlist;
54struct seq_file;
55struct sk_buff;
56
57struct crypto_type {
58 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
59 unsigned int (*extsize)(struct crypto_alg *alg);
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);
66#endif
67
68 unsigned int type;
69 unsigned int maskclear;
70 unsigned int maskset;
71 unsigned int tfmsize;
72};
73
74struct crypto_instance {
75 struct crypto_alg alg;
76
77 struct crypto_template *tmpl;
78
79 union {
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;
84 };
85
86 struct work_struct free_work;
87
88 void *__ctx[] CRYPTO_MINALIGN_ATTR;
89};
90
91struct crypto_template {
92 struct list_head list;
93 struct hlist_head instances;
94 struct module *module;
95
96 int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
97
98 char name[CRYPTO_MAX_ALG_NAME];
99};
100
101struct crypto_spawn {
102 struct list_head list;
103 struct crypto_alg *alg;
104 union {
105 /* Back pointer to instance after registration.*/
106 struct crypto_instance *inst;
107 /* Spawn list pointer prior to registration. */
108 struct crypto_spawn *next;
109 };
110 const struct crypto_type *frontend;
111 u32 mask;
112 bool dead;
113 bool registered;
114};
115
116struct crypto_queue {
117 struct list_head list;
118 struct list_head *backlog;
119
120 unsigned int qlen;
121 unsigned int max_qlen;
122};
123
124struct scatter_walk {
125 struct scatterlist *sg;
126 unsigned int offset;
127};
128
129struct crypto_attr_alg {
130 char name[CRYPTO_MAX_ALG_NAME];
131};
132
133struct crypto_attr_type {
134 u32 type;
135 u32 mask;
136};
137
138/*
139 * Algorithm registration interface.
140 */
141int crypto_register_alg(struct crypto_alg *alg);
142void crypto_unregister_alg(struct crypto_alg *alg);
143int crypto_register_algs(struct crypto_alg *algs, int count);
144void crypto_unregister_algs(struct crypto_alg *algs, int count);
145
146void crypto_mod_put(struct crypto_alg *alg);
147
148int crypto_register_template(struct crypto_template *tmpl);
149int crypto_register_templates(struct crypto_template *tmpls, int count);
150void crypto_unregister_template(struct crypto_template *tmpl);
151void crypto_unregister_templates(struct crypto_template *tmpls, int count);
152struct crypto_template *crypto_lookup_template(const char *name);
153
154int crypto_register_instance(struct crypto_template *tmpl,
155 struct crypto_instance *inst);
156void crypto_unregister_instance(struct crypto_instance *inst);
157
158int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
159 const char *name, u32 type, u32 mask);
160void crypto_drop_spawn(struct crypto_spawn *spawn);
161struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
162 u32 mask);
163void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
164
165struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
166int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret);
167const char *crypto_attr_alg_name(struct rtattr *rta);
168int crypto_inst_setname(struct crypto_instance *inst, const char *name,
169 struct crypto_alg *alg);
170
171void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
172int crypto_enqueue_request(struct crypto_queue *queue,
173 struct crypto_async_request *request);
174void crypto_enqueue_request_head(struct crypto_queue *queue,
175 struct crypto_async_request *request);
176struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
177static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
178{
179 return queue->qlen;
180}
181
182void crypto_inc(u8 *a, unsigned int size);
183
184static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
185{
186 return tfm->__crt_ctx;
187}
188
189static inline void *crypto_tfm_ctx_align(struct crypto_tfm *tfm,
190 unsigned int align)
191{
192 if (align <= crypto_tfm_ctx_alignment())
193 align = 1;
194
195 return PTR_ALIGN(crypto_tfm_ctx(tfm), align);
196}
197
198static inline unsigned int crypto_dma_align(void)
199{
200 return CRYPTO_DMA_ALIGN;
201}
202
203static inline unsigned int crypto_dma_padding(void)
204{
205 return (crypto_dma_align() - 1) & ~(crypto_tfm_ctx_alignment() - 1);
206}
207
208static inline void *crypto_tfm_ctx_dma(struct crypto_tfm *tfm)
209{
210 return crypto_tfm_ctx_align(tfm, crypto_dma_align());
211}
212
213static inline struct crypto_instance *crypto_tfm_alg_instance(
214 struct crypto_tfm *tfm)
215{
216 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
217}
218
219static inline void *crypto_instance_ctx(struct crypto_instance *inst)
220{
221 return inst->__ctx;
222}
223
224static inline struct crypto_async_request *crypto_get_backlog(
225 struct crypto_queue *queue)
226{
227 return queue->backlog == &queue->list ? NULL :
228 container_of(queue->backlog, struct crypto_async_request, list);
229}
230
231static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off)
232{
233 return (algt->type ^ off) & algt->mask & off;
234}
235
236/*
237 * When an algorithm uses another algorithm (e.g., if it's an instance of a
238 * template), these are the flags that should always be set on the "outer"
239 * algorithm if any "inner" algorithm has them set.
240 */
241#define CRYPTO_ALG_INHERITED_FLAGS \
242 (CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK | \
243 CRYPTO_ALG_ALLOCATES_MEMORY)
244
245/*
246 * Given the type and mask that specify the flags restrictions on a template
247 * instance being created, return the mask that should be passed to
248 * crypto_grab_*() (along with type=0) to honor any request the user made to
249 * have any of the CRYPTO_ALG_INHERITED_FLAGS clear.
250 */
251static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt)
252{
253 return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS);
254}
255
256int crypto_register_notifier(struct notifier_block *nb);
257int crypto_unregister_notifier(struct notifier_block *nb);
258
259/* Crypto notification events. */
260enum {
261 CRYPTO_MSG_ALG_REQUEST,
262 CRYPTO_MSG_ALG_REGISTER,
263 CRYPTO_MSG_ALG_LOADED,
264};
265
266static inline void crypto_request_complete(struct crypto_async_request *req,
267 int err)
268{
269 req->complete(req->data, err);
270}
271
272static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
273{
274 return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
275}
276
277#endif /* _CRYPTO_ALGAPI_H */
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Cryptographic API for algorithms (i.e., low-level API).
4 *
5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
6 */
7#ifndef _CRYPTO_ALGAPI_H
8#define _CRYPTO_ALGAPI_H
9
10#include <linux/crypto.h>
11#include <linux/list.h>
12#include <linux/kernel.h>
13
14/*
15 * Maximum values for blocksize and alignmask, used to allocate
16 * static buffers that are big enough for any combination of
17 * algs and architectures. Ciphers have a lower maximum size.
18 */
19#define MAX_ALGAPI_BLOCKSIZE 160
20#define MAX_ALGAPI_ALIGNMASK 63
21#define MAX_CIPHER_BLOCKSIZE 16
22#define MAX_CIPHER_ALIGNMASK 15
23
24struct crypto_aead;
25struct crypto_instance;
26struct module;
27struct rtattr;
28struct seq_file;
29struct sk_buff;
30
31struct crypto_type {
32 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
33 unsigned int (*extsize)(struct crypto_alg *alg);
34 int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
35 int (*init_tfm)(struct crypto_tfm *tfm);
36 void (*show)(struct seq_file *m, struct crypto_alg *alg);
37 int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
38 void (*free)(struct crypto_instance *inst);
39
40 unsigned int type;
41 unsigned int maskclear;
42 unsigned int maskset;
43 unsigned int tfmsize;
44};
45
46struct crypto_instance {
47 struct crypto_alg alg;
48
49 struct crypto_template *tmpl;
50
51 union {
52 /* Node in list of instances after registration. */
53 struct hlist_node list;
54 /* List of attached spawns before registration. */
55 struct crypto_spawn *spawns;
56 };
57
58 void *__ctx[] CRYPTO_MINALIGN_ATTR;
59};
60
61struct crypto_template {
62 struct list_head list;
63 struct hlist_head instances;
64 struct module *module;
65
66 int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
67
68 char name[CRYPTO_MAX_ALG_NAME];
69};
70
71struct crypto_spawn {
72 struct list_head list;
73 struct crypto_alg *alg;
74 union {
75 /* Back pointer to instance after registration.*/
76 struct crypto_instance *inst;
77 /* Spawn list pointer prior to registration. */
78 struct crypto_spawn *next;
79 };
80 const struct crypto_type *frontend;
81 u32 mask;
82 bool dead;
83 bool registered;
84};
85
86struct crypto_queue {
87 struct list_head list;
88 struct list_head *backlog;
89
90 unsigned int qlen;
91 unsigned int max_qlen;
92};
93
94struct scatter_walk {
95 struct scatterlist *sg;
96 unsigned int offset;
97};
98
99struct crypto_attr_alg {
100 char name[CRYPTO_MAX_ALG_NAME];
101};
102
103struct crypto_attr_type {
104 u32 type;
105 u32 mask;
106};
107
108void crypto_mod_put(struct crypto_alg *alg);
109
110int crypto_register_template(struct crypto_template *tmpl);
111int crypto_register_templates(struct crypto_template *tmpls, int count);
112void crypto_unregister_template(struct crypto_template *tmpl);
113void crypto_unregister_templates(struct crypto_template *tmpls, int count);
114struct crypto_template *crypto_lookup_template(const char *name);
115
116int crypto_register_instance(struct crypto_template *tmpl,
117 struct crypto_instance *inst);
118void crypto_unregister_instance(struct crypto_instance *inst);
119
120int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
121 const char *name, u32 type, u32 mask);
122void crypto_drop_spawn(struct crypto_spawn *spawn);
123struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
124 u32 mask);
125void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
126
127struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
128int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret);
129const char *crypto_attr_alg_name(struct rtattr *rta);
130int crypto_inst_setname(struct crypto_instance *inst, const char *name,
131 struct crypto_alg *alg);
132
133void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
134int crypto_enqueue_request(struct crypto_queue *queue,
135 struct crypto_async_request *request);
136void crypto_enqueue_request_head(struct crypto_queue *queue,
137 struct crypto_async_request *request);
138struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
139static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
140{
141 return queue->qlen;
142}
143
144void crypto_inc(u8 *a, unsigned int size);
145void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size);
146
147static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
148{
149 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
150 __builtin_constant_p(size) &&
151 (size % sizeof(unsigned long)) == 0) {
152 unsigned long *d = (unsigned long *)dst;
153 unsigned long *s = (unsigned long *)src;
154
155 while (size > 0) {
156 *d++ ^= *s++;
157 size -= sizeof(unsigned long);
158 }
159 } else {
160 __crypto_xor(dst, dst, src, size);
161 }
162}
163
164static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,
165 unsigned int size)
166{
167 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
168 __builtin_constant_p(size) &&
169 (size % sizeof(unsigned long)) == 0) {
170 unsigned long *d = (unsigned long *)dst;
171 unsigned long *s1 = (unsigned long *)src1;
172 unsigned long *s2 = (unsigned long *)src2;
173
174 while (size > 0) {
175 *d++ = *s1++ ^ *s2++;
176 size -= sizeof(unsigned long);
177 }
178 } else {
179 __crypto_xor(dst, src1, src2, size);
180 }
181}
182
183static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
184{
185 return PTR_ALIGN(crypto_tfm_ctx(tfm),
186 crypto_tfm_alg_alignmask(tfm) + 1);
187}
188
189static inline struct crypto_instance *crypto_tfm_alg_instance(
190 struct crypto_tfm *tfm)
191{
192 return container_of(tfm->__crt_alg, struct crypto_instance, alg);
193}
194
195static inline void *crypto_instance_ctx(struct crypto_instance *inst)
196{
197 return inst->__ctx;
198}
199
200static inline struct crypto_async_request *crypto_get_backlog(
201 struct crypto_queue *queue)
202{
203 return queue->backlog == &queue->list ? NULL :
204 container_of(queue->backlog, struct crypto_async_request, list);
205}
206
207static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off)
208{
209 return (algt->type ^ off) & algt->mask & off;
210}
211
212/*
213 * When an algorithm uses another algorithm (e.g., if it's an instance of a
214 * template), these are the flags that should always be set on the "outer"
215 * algorithm if any "inner" algorithm has them set.
216 */
217#define CRYPTO_ALG_INHERITED_FLAGS \
218 (CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK | \
219 CRYPTO_ALG_ALLOCATES_MEMORY)
220
221/*
222 * Given the type and mask that specify the flags restrictions on a template
223 * instance being created, return the mask that should be passed to
224 * crypto_grab_*() (along with type=0) to honor any request the user made to
225 * have any of the CRYPTO_ALG_INHERITED_FLAGS clear.
226 */
227static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt)
228{
229 return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS);
230}
231
232noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
233
234/**
235 * crypto_memneq - Compare two areas of memory without leaking
236 * timing information.
237 *
238 * @a: One area of memory
239 * @b: Another area of memory
240 * @size: The size of the area.
241 *
242 * Returns 0 when data is equal, 1 otherwise.
243 */
244static inline int crypto_memneq(const void *a, const void *b, size_t size)
245{
246 return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
247}
248
249int crypto_register_notifier(struct notifier_block *nb);
250int crypto_unregister_notifier(struct notifier_block *nb);
251
252/* Crypto notification events. */
253enum {
254 CRYPTO_MSG_ALG_REQUEST,
255 CRYPTO_MSG_ALG_REGISTER,
256 CRYPTO_MSG_ALG_LOADED,
257};
258
259#endif /* _CRYPTO_ALGAPI_H */