1 /* 2 * Cryptographic API for algorithms (i.e., low-level API). 3 * 4 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 #ifndef _CRYPTO_ALGAPI_H 13 #define _CRYPTO_ALGAPI_H 14 15 #include <linux/crypto.h> 16 #include <linux/list.h> 17 #include <linux/kernel.h> 18 19 struct module; 20 struct rtattr; 21 struct seq_file; 22 23 struct crypto_type { 24 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask); 25 int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask); 26 void (*exit)(struct crypto_tfm *tfm); 27 void (*show)(struct seq_file *m, struct crypto_alg *alg); 28 }; 29 30 struct crypto_instance { 31 struct crypto_alg alg; 32 33 struct crypto_template *tmpl; 34 struct hlist_node list; 35 36 void *__ctx[] CRYPTO_MINALIGN_ATTR; 37 }; 38 39 struct crypto_template { 40 struct list_head list; 41 struct hlist_head instances; 42 struct module *module; 43 44 struct crypto_instance *(*alloc)(struct rtattr **tb); 45 void (*free)(struct crypto_instance *inst); 46 47 char name[CRYPTO_MAX_ALG_NAME]; 48 }; 49 50 struct crypto_spawn { 51 struct list_head list; 52 struct crypto_alg *alg; 53 struct crypto_instance *inst; 54 u32 mask; 55 }; 56 57 struct crypto_queue { 58 struct list_head list; 59 struct list_head *backlog; 60 61 unsigned int qlen; 62 unsigned int max_qlen; 63 }; 64 65 struct scatter_walk { 66 struct scatterlist *sg; 67 unsigned int offset; 68 }; 69 70 struct blkcipher_walk { 71 union { 72 struct { 73 struct page *page; 74 unsigned long offset; 75 } phys; 76 77 struct { 78 u8 *page; 79 u8 *addr; 80 } virt; 81 } src, dst; 82 83 struct scatter_walk in; 84 unsigned int nbytes; 85 86 struct scatter_walk out; 87 unsigned int total; 88 89 void *page; 90 u8 *buffer; 91 u8 *iv; 92 93 int flags; 94 unsigned int blocksize; 95 }; 96 97 extern const struct crypto_type crypto_ablkcipher_type; 98 extern const struct crypto_type crypto_aead_type; 99 extern const struct crypto_type crypto_blkcipher_type; 100 extern const struct crypto_type crypto_hash_type; 101 102 void crypto_mod_put(struct crypto_alg *alg); 103 104 int crypto_register_template(struct crypto_template *tmpl); 105 void crypto_unregister_template(struct crypto_template *tmpl); 106 struct crypto_template *crypto_lookup_template(const char *name); 107 108 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg, 109 struct crypto_instance *inst, u32 mask); 110 void crypto_drop_spawn(struct crypto_spawn *spawn); 111 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 112 u32 mask); 113 114 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb); 115 int crypto_check_attr_type(struct rtattr **tb, u32 type); 116 struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask); 117 int crypto_attr_u32(struct rtattr *rta, u32 *num); 118 struct crypto_instance *crypto_alloc_instance(const char *name, 119 struct crypto_alg *alg); 120 121 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen); 122 int crypto_enqueue_request(struct crypto_queue *queue, 123 struct crypto_async_request *request); 124 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue); 125 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm); 126 127 int blkcipher_walk_done(struct blkcipher_desc *desc, 128 struct blkcipher_walk *walk, int err); 129 int blkcipher_walk_virt(struct blkcipher_desc *desc, 130 struct blkcipher_walk *walk); 131 int blkcipher_walk_phys(struct blkcipher_desc *desc, 132 struct blkcipher_walk *walk); 133 int blkcipher_walk_virt_block(struct blkcipher_desc *desc, 134 struct blkcipher_walk *walk, 135 unsigned int blocksize); 136 137 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm) 138 { 139 unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm); 140 unsigned long align = crypto_tfm_alg_alignmask(tfm); 141 142 if (align <= crypto_tfm_ctx_alignment()) 143 align = 1; 144 return (void *)ALIGN(addr, align); 145 } 146 147 static inline struct crypto_instance *crypto_tfm_alg_instance( 148 struct crypto_tfm *tfm) 149 { 150 return container_of(tfm->__crt_alg, struct crypto_instance, alg); 151 } 152 153 static inline void *crypto_instance_ctx(struct crypto_instance *inst) 154 { 155 return inst->__ctx; 156 } 157 158 static inline struct ablkcipher_alg *crypto_ablkcipher_alg( 159 struct crypto_ablkcipher *tfm) 160 { 161 return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher; 162 } 163 164 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm) 165 { 166 return crypto_tfm_ctx(&tfm->base); 167 } 168 169 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm) 170 { 171 return crypto_tfm_ctx_aligned(&tfm->base); 172 } 173 174 static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm) 175 { 176 return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead; 177 } 178 179 static inline void *crypto_aead_ctx(struct crypto_aead *tfm) 180 { 181 return crypto_tfm_ctx(&tfm->base); 182 } 183 184 static inline struct crypto_instance *crypto_aead_alg_instance( 185 struct crypto_aead *aead) 186 { 187 return crypto_tfm_alg_instance(&aead->base); 188 } 189 190 static inline struct crypto_ablkcipher *crypto_spawn_ablkcipher( 191 struct crypto_spawn *spawn) 192 { 193 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER; 194 u32 mask = CRYPTO_ALG_TYPE_MASK; 195 196 return __crypto_ablkcipher_cast(crypto_spawn_tfm(spawn, type, mask)); 197 } 198 199 static inline struct crypto_blkcipher *crypto_spawn_blkcipher( 200 struct crypto_spawn *spawn) 201 { 202 u32 type = CRYPTO_ALG_TYPE_BLKCIPHER; 203 u32 mask = CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC; 204 205 return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask)); 206 } 207 208 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm) 209 { 210 return crypto_tfm_ctx(&tfm->base); 211 } 212 213 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm) 214 { 215 return crypto_tfm_ctx_aligned(&tfm->base); 216 } 217 218 static inline struct crypto_cipher *crypto_spawn_cipher( 219 struct crypto_spawn *spawn) 220 { 221 u32 type = CRYPTO_ALG_TYPE_CIPHER; 222 u32 mask = CRYPTO_ALG_TYPE_MASK; 223 224 return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask)); 225 } 226 227 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm) 228 { 229 return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher; 230 } 231 232 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn) 233 { 234 u32 type = CRYPTO_ALG_TYPE_HASH; 235 u32 mask = CRYPTO_ALG_TYPE_HASH_MASK; 236 237 return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask)); 238 } 239 240 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm) 241 { 242 return crypto_tfm_ctx_aligned(&tfm->base); 243 } 244 245 static inline void blkcipher_walk_init(struct blkcipher_walk *walk, 246 struct scatterlist *dst, 247 struct scatterlist *src, 248 unsigned int nbytes) 249 { 250 walk->in.sg = src; 251 walk->out.sg = dst; 252 walk->total = nbytes; 253 } 254 255 static inline struct crypto_async_request *crypto_get_backlog( 256 struct crypto_queue *queue) 257 { 258 return queue->backlog == &queue->list ? NULL : 259 container_of(queue->backlog, struct crypto_async_request, list); 260 } 261 262 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue, 263 struct ablkcipher_request *request) 264 { 265 return crypto_enqueue_request(queue, &request->base); 266 } 267 268 static inline struct ablkcipher_request *ablkcipher_dequeue_request( 269 struct crypto_queue *queue) 270 { 271 return ablkcipher_request_cast(crypto_dequeue_request(queue)); 272 } 273 274 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req) 275 { 276 return req->__ctx; 277 } 278 279 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue, 280 struct crypto_ablkcipher *tfm) 281 { 282 return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm)); 283 } 284 285 static inline void *aead_request_ctx(struct aead_request *req) 286 { 287 return req->__ctx; 288 } 289 290 static inline void aead_request_complete(struct aead_request *req, int err) 291 { 292 req->base.complete(&req->base, err); 293 } 294 295 static inline u32 aead_request_flags(struct aead_request *req) 296 { 297 return req->base.flags; 298 } 299 300 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, 301 u32 type, u32 mask) 302 { 303 return crypto_attr_alg(tb[1], type, mask); 304 } 305 306 #endif /* _CRYPTO_ALGAPI_H */ 307 308