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 #include <linux/skbuff.h> 14 15 /* 16 * Maximum values for blocksize and alignmask, used to allocate 17 * static buffers that are big enough for any combination of 18 * algs and architectures. Ciphers have a lower maximum size. 19 */ 20 #define MAX_ALGAPI_BLOCKSIZE 160 21 #define MAX_ALGAPI_ALIGNMASK 63 22 #define MAX_CIPHER_BLOCKSIZE 16 23 #define MAX_CIPHER_ALIGNMASK 15 24 25 struct crypto_aead; 26 struct crypto_instance; 27 struct module; 28 struct rtattr; 29 struct seq_file; 30 31 struct 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 46 struct 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 61 struct crypto_template { 62 struct list_head list; 63 struct hlist_head instances; 64 struct module *module; 65 66 struct crypto_instance *(*alloc)(struct rtattr **tb); 67 void (*free)(struct crypto_instance *inst); 68 int (*create)(struct crypto_template *tmpl, struct rtattr **tb); 69 70 char name[CRYPTO_MAX_ALG_NAME]; 71 }; 72 73 struct crypto_spawn { 74 struct list_head list; 75 struct crypto_alg *alg; 76 union { 77 /* Back pointer to instance after registration.*/ 78 struct crypto_instance *inst; 79 /* Spawn list pointer prior to registration. */ 80 struct crypto_spawn *next; 81 }; 82 const struct crypto_type *frontend; 83 u32 mask; 84 bool dead; 85 bool dropref; 86 bool registered; 87 }; 88 89 struct crypto_queue { 90 struct list_head list; 91 struct list_head *backlog; 92 93 unsigned int qlen; 94 unsigned int max_qlen; 95 }; 96 97 struct scatter_walk { 98 struct scatterlist *sg; 99 unsigned int offset; 100 }; 101 102 void crypto_mod_put(struct crypto_alg *alg); 103 104 int crypto_register_template(struct crypto_template *tmpl); 105 int crypto_register_templates(struct crypto_template *tmpls, int count); 106 void crypto_unregister_template(struct crypto_template *tmpl); 107 void crypto_unregister_templates(struct crypto_template *tmpls, int count); 108 struct crypto_template *crypto_lookup_template(const char *name); 109 110 int crypto_register_instance(struct crypto_template *tmpl, 111 struct crypto_instance *inst); 112 void crypto_unregister_instance(struct crypto_instance *inst); 113 114 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 115 struct crypto_instance *inst, u32 mask); 116 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg, 117 struct crypto_instance *inst, 118 const struct crypto_type *frontend); 119 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst, 120 const char *name, u32 type, u32 mask); 121 122 void crypto_drop_spawn(struct crypto_spawn *spawn); 123 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 124 u32 mask); 125 void *crypto_spawn_tfm2(struct crypto_spawn *spawn); 126 127 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb); 128 int crypto_check_attr_type(struct rtattr **tb, u32 type); 129 const char *crypto_attr_alg_name(struct rtattr *rta); 130 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta, 131 const struct crypto_type *frontend, 132 u32 type, u32 mask); 133 134 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta, 135 u32 type, u32 mask) 136 { 137 return crypto_attr_alg2(rta, NULL, type, mask); 138 } 139 140 int crypto_attr_u32(struct rtattr *rta, u32 *num); 141 int crypto_inst_setname(struct crypto_instance *inst, const char *name, 142 struct crypto_alg *alg); 143 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg, 144 unsigned int head); 145 146 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen); 147 int crypto_enqueue_request(struct crypto_queue *queue, 148 struct crypto_async_request *request); 149 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue); 150 static inline unsigned int crypto_queue_len(struct crypto_queue *queue) 151 { 152 return queue->qlen; 153 } 154 155 void crypto_inc(u8 *a, unsigned int size); 156 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size); 157 158 static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size) 159 { 160 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && 161 __builtin_constant_p(size) && 162 (size % sizeof(unsigned long)) == 0) { 163 unsigned long *d = (unsigned long *)dst; 164 unsigned long *s = (unsigned long *)src; 165 166 while (size > 0) { 167 *d++ ^= *s++; 168 size -= sizeof(unsigned long); 169 } 170 } else { 171 __crypto_xor(dst, dst, src, size); 172 } 173 } 174 175 static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2, 176 unsigned int size) 177 { 178 if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && 179 __builtin_constant_p(size) && 180 (size % sizeof(unsigned long)) == 0) { 181 unsigned long *d = (unsigned long *)dst; 182 unsigned long *s1 = (unsigned long *)src1; 183 unsigned long *s2 = (unsigned long *)src2; 184 185 while (size > 0) { 186 *d++ = *s1++ ^ *s2++; 187 size -= sizeof(unsigned long); 188 } 189 } else { 190 __crypto_xor(dst, src1, src2, size); 191 } 192 } 193 194 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm) 195 { 196 return PTR_ALIGN(crypto_tfm_ctx(tfm), 197 crypto_tfm_alg_alignmask(tfm) + 1); 198 } 199 200 static inline struct crypto_instance *crypto_tfm_alg_instance( 201 struct crypto_tfm *tfm) 202 { 203 return container_of(tfm->__crt_alg, struct crypto_instance, alg); 204 } 205 206 static inline void *crypto_instance_ctx(struct crypto_instance *inst) 207 { 208 return inst->__ctx; 209 } 210 211 static inline struct crypto_cipher *crypto_spawn_cipher( 212 struct crypto_spawn *spawn) 213 { 214 u32 type = CRYPTO_ALG_TYPE_CIPHER; 215 u32 mask = CRYPTO_ALG_TYPE_MASK; 216 217 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask)); 218 } 219 220 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm) 221 { 222 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher; 223 } 224 225 static inline struct crypto_async_request *crypto_get_backlog( 226 struct crypto_queue *queue) 227 { 228 return queue->backlog == &queue->list ? NULL : 229 container_of(queue->backlog, struct crypto_async_request, list); 230 } 231 232 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, 233 u32 type, u32 mask) 234 { 235 return crypto_attr_alg(tb[1], type, mask); 236 } 237 238 static inline int crypto_requires_off(u32 type, u32 mask, u32 off) 239 { 240 return (type ^ off) & mask & off; 241 } 242 243 /* 244 * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms. 245 * Otherwise returns zero. 246 */ 247 static inline int crypto_requires_sync(u32 type, u32 mask) 248 { 249 return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC); 250 } 251 252 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size); 253 254 /** 255 * crypto_memneq - Compare two areas of memory without leaking 256 * timing information. 257 * 258 * @a: One area of memory 259 * @b: Another area of memory 260 * @size: The size of the area. 261 * 262 * Returns 0 when data is equal, 1 otherwise. 263 */ 264 static inline int crypto_memneq(const void *a, const void *b, size_t size) 265 { 266 return __crypto_memneq(a, b, size) != 0UL ? 1 : 0; 267 } 268 269 static inline void crypto_yield(u32 flags) 270 { 271 if (flags & CRYPTO_TFM_REQ_MAY_SLEEP) 272 cond_resched(); 273 } 274 275 int crypto_register_notifier(struct notifier_block *nb); 276 int crypto_unregister_notifier(struct notifier_block *nb); 277 278 /* Crypto notification events. */ 279 enum { 280 CRYPTO_MSG_ALG_REQUEST, 281 CRYPTO_MSG_ALG_REGISTER, 282 CRYPTO_MSG_ALG_LOADED, 283 }; 284 285 #endif /* _CRYPTO_ALGAPI_H */ 286