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