include/crypto/algapi.h

   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 #include <linux/skbuff.h>
  19
  20 struct module;
  21 struct rtattr;
  22 struct seq_file;
  23
  24 struct crypto_type {
  25         unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
  26         unsigned int (*extsize)(struct crypto_alg *alg);
  27         int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
  28         int (*init_tfm)(struct crypto_tfm *tfm);
  29         void (*show)(struct seq_file *m, struct crypto_alg *alg);
  30         int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
  31         struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask);
  32
  33         unsigned int type;
  34         unsigned int maskclear;
  35         unsigned int maskset;
  36         unsigned int tfmsize;
  37 };
  38
  39 struct crypto_instance {
  40         struct crypto_alg alg;
  41
  42         struct crypto_template *tmpl;
  43         struct hlist_node list;
  44
  45         void *__ctx[] CRYPTO_MINALIGN_ATTR;
  46 };
  47
  48 struct crypto_template {
  49         struct list_head list;
  50         struct hlist_head instances;
  51         struct module *module;
  52
  53         struct crypto_instance *(*alloc)(struct rtattr **tb);
  54         void (*free)(struct crypto_instance *inst);
  55         int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
  56
  57         char name[CRYPTO_MAX_ALG_NAME];
  58 };
  59
  60 struct crypto_spawn {
  61         struct list_head list;
  62         struct crypto_alg *alg;
  63         struct crypto_instance *inst;
  64         const struct crypto_type *frontend;
  65         u32 mask;
  66 };
  67
  68 struct crypto_queue {
  69         struct list_head list;
  70         struct list_head *backlog;
  71
  72         unsigned int qlen;
  73         unsigned int max_qlen;
  74 };
  75
  76 struct scatter_walk {
  77         struct scatterlist *sg;
  78         unsigned int offset;
  79 };
  80
  81 struct blkcipher_walk {
  82         union {
  83                 struct {
  84                         struct page *page;
  85                         unsigned long offset;
  86                 } phys;
  87
  88                 struct {
  89                         u8 *page;
  90                         u8 *addr;
  91                 } virt;
  92         } src, dst;
  93
  94         struct scatter_walk in;
  95         unsigned int nbytes;
  96
  97         struct scatter_walk out;
  98         unsigned int total;
  99
 100         void *page;
 101         u8 *buffer;
 102         u8 *iv;
 103
 104         int flags;
 105         unsigned int blocksize;
 106 };
 107
 108 struct ablkcipher_walk {
 109         struct {
 110                 struct page *page;
 111                 unsigned int offset;
 112         } src, dst;
 113
 114         struct scatter_walk     in;
 115         unsigned int            nbytes;
 116         struct scatter_walk     out;
 117         unsigned int            total;
 118         struct list_head        buffers;
 119         u8                      *iv_buffer;
 120         u8                      *iv;
 121         int                     flags;
 122         unsigned int            blocksize;
 123 };
 124
 125 extern const struct crypto_type crypto_ablkcipher_type;
 126 extern const struct crypto_type crypto_aead_type;
 127 extern const struct crypto_type crypto_blkcipher_type;
 128
 129 void crypto_mod_put(struct crypto_alg *alg);
 130
 131 int crypto_register_template(struct crypto_template *tmpl);
 132 void crypto_unregister_template(struct crypto_template *tmpl);
 133 struct crypto_template *crypto_lookup_template(const char *name);
 134
 135 int crypto_register_instance(struct crypto_template *tmpl,
 136                              struct crypto_instance *inst);
 137 int crypto_unregister_instance(struct crypto_alg *alg);
 138
 139 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 140                       struct crypto_instance *inst, u32 mask);
 141 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 142                        struct crypto_instance *inst,
 143                        const struct crypto_type *frontend);
 144
 145 void crypto_drop_spawn(struct crypto_spawn *spawn);
 146 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 147                                     u32 mask);
 148 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
 149
 150 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
 151                                     struct crypto_instance *inst)
 152 {
 153         spawn->inst = inst;
 154 }
 155
 156 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
 157 int crypto_check_attr_type(struct rtattr **tb, u32 type);
 158 const char *crypto_attr_alg_name(struct rtattr *rta);
 159 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 160                                     const struct crypto_type *frontend,
 161                                     u32 type, u32 mask);
 162
 163 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
 164                                                  u32 type, u32 mask)
 165 {
 166         return crypto_attr_alg2(rta, NULL, type, mask);
 167 }
 168
 169 int crypto_attr_u32(struct rtattr *rta, u32 *num);
 170 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 171                              unsigned int head);
 172 struct crypto_instance *crypto_alloc_instance(const char *name,
 173                                               struct crypto_alg *alg);
 174
 175 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
 176 int crypto_enqueue_request(struct crypto_queue *queue,
 177                            struct crypto_async_request *request);
 178 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset);
 179 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
 180 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
 181
 182 /* These functions require the input/output to be aligned as u32. */
 183 void crypto_inc(u8 *a, unsigned int size);
 184 void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
 185
 186 int blkcipher_walk_done(struct blkcipher_desc *desc,
 187                         struct blkcipher_walk *walk, int err);
 188 int blkcipher_walk_virt(struct blkcipher_desc *desc,
 189                         struct blkcipher_walk *walk);
 190 int blkcipher_walk_phys(struct blkcipher_desc *desc,
 191                         struct blkcipher_walk *walk);
 192 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
 193                               struct blkcipher_walk *walk,
 194                               unsigned int blocksize);
 195
 196 int ablkcipher_walk_done(struct ablkcipher_request *req,
 197                          struct ablkcipher_walk *walk, int err);
 198 int ablkcipher_walk_phys(struct ablkcipher_request *req,
 199                          struct ablkcipher_walk *walk);
 200 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
 201
 202 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
 203 {
 204         return PTR_ALIGN(crypto_tfm_ctx(tfm),
 205                          crypto_tfm_alg_alignmask(tfm) + 1);
 206 }
 207
 208 static inline struct crypto_instance *crypto_tfm_alg_instance(
 209         struct crypto_tfm *tfm)
 210 {
 211         return container_of(tfm->__crt_alg, struct crypto_instance, alg);
 212 }
 213
 214 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 215 {
 216         return inst->__ctx;
 217 }
 218
 219 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
 220         struct crypto_ablkcipher *tfm)
 221 {
 222         return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
 223 }
 224
 225 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
 226 {
 227         return crypto_tfm_ctx(&tfm->base);
 228 }
 229
 230 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
 231 {
 232         return crypto_tfm_ctx_aligned(&tfm->base);
 233 }
 234
 235 static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm)
 236 {
 237         return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead;
 238 }
 239
 240 static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
 241 {
 242         return crypto_tfm_ctx(&tfm->base);
 243 }
 244
 245 static inline struct crypto_instance *crypto_aead_alg_instance(
 246         struct crypto_aead *aead)
 247 {
 248         return crypto_tfm_alg_instance(&aead->base);
 249 }
 250
 251 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
 252         struct crypto_spawn *spawn)
 253 {
 254         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
 255         u32 mask = CRYPTO_ALG_TYPE_MASK;
 256
 257         return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
 258 }
 259
 260 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
 261 {
 262         return crypto_tfm_ctx(&tfm->base);
 263 }
 264
 265 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
 266 {
 267         return crypto_tfm_ctx_aligned(&tfm->base);
 268 }
 269
 270 static inline struct crypto_cipher *crypto_spawn_cipher(
 271         struct crypto_spawn *spawn)
 272 {
 273         u32 type = CRYPTO_ALG_TYPE_CIPHER;
 274         u32 mask = CRYPTO_ALG_TYPE_MASK;
 275
 276         return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
 277 }
 278
 279 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
 280 {
 281         return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
 282 }
 283
 284 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
 285 {
 286         u32 type = CRYPTO_ALG_TYPE_HASH;
 287         u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
 288
 289         return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
 290 }
 291
 292 static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
 293 {
 294         return crypto_tfm_ctx(&tfm->base);
 295 }
 296
 297 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
 298 {
 299         return crypto_tfm_ctx_aligned(&tfm->base);
 300 }
 301
 302 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
 303                                        struct scatterlist *dst,
 304                                        struct scatterlist *src,
 305                                        unsigned int nbytes)
 306 {
 307         walk->in.sg = src;
 308         walk->out.sg = dst;
 309         walk->total = nbytes;
 310 }
 311
 312 static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
 313                                         struct scatterlist *dst,
 314                                         struct scatterlist *src,
 315                                         unsigned int nbytes)
 316 {
 317         walk->in.sg = src;
 318         walk->out.sg = dst;
 319         walk->total = nbytes;
 320         INIT_LIST_HEAD(&walk->buffers);
 321 }
 322
 323 static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
 324 {
 325         if (unlikely(!list_empty(&walk->buffers)))
 326                 __ablkcipher_walk_complete(walk);
 327 }
 328
 329 static inline struct crypto_async_request *crypto_get_backlog(
 330         struct crypto_queue *queue)
 331 {
 332         return queue->backlog == &queue->list ? NULL :
 333                container_of(queue->backlog, struct crypto_async_request, list);
 334 }
 335
 336 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
 337                                              struct ablkcipher_request *request)
 338 {
 339         return crypto_enqueue_request(queue, &request->base);
 340 }
 341
 342 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
 343         struct crypto_queue *queue)
 344 {
 345         return ablkcipher_request_cast(crypto_dequeue_request(queue));
 346 }
 347
 348 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
 349 {
 350         return req->__ctx;
 351 }
 352
 353 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
 354                                           struct crypto_ablkcipher *tfm)
 355 {
 356         return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
 357 }
 358
 359 static inline void *aead_request_ctx(struct aead_request *req)
 360 {
 361         return req->__ctx;
 362 }
 363
 364 static inline void aead_request_complete(struct aead_request *req, int err)
 365 {
 366         req->base.complete(&req->base, err);
 367 }
 368
 369 static inline u32 aead_request_flags(struct aead_request *req)
 370 {
 371         return req->base.flags;
 372 }
 373
 374 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
 375                                                      u32 type, u32 mask)
 376 {
 377         return crypto_attr_alg(tb[1], type, mask);
 378 }
 379
 380 /*
 381  * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
 382  * Otherwise returns zero.
 383  */
 384 static inline int crypto_requires_sync(u32 type, u32 mask)
 385 {
 386         return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
 387 }
 388
 389 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
 390
 391 /**
 392  * crypto_memneq - Compare two areas of memory without leaking
 393  *                 timing information.
 394  *
 395  * @a: One area of memory
 396  * @b: Another area of memory
 397  * @size: The size of the area.
 398  *
 399  * Returns 0 when data is equal, 1 otherwise.
 400  */
 401 static inline int crypto_memneq(const void *a, const void *b, size_t size)
 402 {
 403         return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
 404 }
 405
 406 #endif  /* _CRYPTO_ALGAPI_H */