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