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/kthread.h>
  19 #include <linux/skbuff.h>
  20
  21 struct crypto_aead;
  22 struct crypto_instance;
  23 struct module;
  24 struct rtattr;
  25 struct seq_file;
  26
  27 struct crypto_type {
  28         unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
  29         unsigned int (*extsize)(struct crypto_alg *alg);
  30         int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
  31         int (*init_tfm)(struct crypto_tfm *tfm);
  32         void (*show)(struct seq_file *m, struct crypto_alg *alg);
  33         int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
  34         struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask);
  35         void (*free)(struct crypto_instance *inst);
  36
  37         unsigned int type;
  38         unsigned int maskclear;
  39         unsigned int maskset;
  40         unsigned int tfmsize;
  41 };
  42
  43 struct crypto_instance {
  44         struct crypto_alg alg;
  45
  46         struct crypto_template *tmpl;
  47         struct hlist_node list;
  48
  49         void *__ctx[] CRYPTO_MINALIGN_ATTR;
  50 };
  51
  52 struct crypto_template {
  53         struct list_head list;
  54         struct hlist_head instances;
  55         struct module *module;
  56
  57         struct crypto_instance *(*alloc)(struct rtattr **tb);
  58         void (*free)(struct crypto_instance *inst);
  59         int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
  60
  61         char name[CRYPTO_MAX_ALG_NAME];
  62 };
  63
  64 struct crypto_spawn {
  65         struct list_head list;
  66         struct crypto_alg *alg;
  67         struct crypto_instance *inst;
  68         const struct crypto_type *frontend;
  69         u32 mask;
  70 };
  71
  72 struct crypto_queue {
  73         struct list_head list;
  74         struct list_head *backlog;
  75
  76         unsigned int qlen;
  77         unsigned int max_qlen;
  78 };
  79
  80 struct scatter_walk {
  81         struct scatterlist *sg;
  82         unsigned int offset;
  83 };
  84
  85 struct blkcipher_walk {
  86         union {
  87                 struct {
  88                         struct page *page;
  89                         unsigned long offset;
  90                 } phys;
  91
  92                 struct {
  93                         u8 *page;
  94                         u8 *addr;
  95                 } virt;
  96         } src, dst;
  97
  98         struct scatter_walk in;
  99         unsigned int nbytes;
 100
 101         struct scatter_walk out;
 102         unsigned int total;
 103
 104         void *page;
 105         u8 *buffer;
 106         u8 *iv;
 107         unsigned int ivsize;
 108
 109         int flags;
 110         unsigned int walk_blocksize;
 111         unsigned int cipher_blocksize;
 112         unsigned int alignmask;
 113 };
 114
 115 struct ablkcipher_walk {
 116         struct {
 117                 struct page *page;
 118                 unsigned int offset;
 119         } src, dst;
 120
 121         struct scatter_walk     in;
 122         unsigned int            nbytes;
 123         struct scatter_walk     out;
 124         unsigned int            total;
 125         struct list_head        buffers;
 126         u8                      *iv_buffer;
 127         u8                      *iv;
 128         int                     flags;
 129         unsigned int            blocksize;
 130 };
 131
 132 #define ENGINE_NAME_LEN 30
 133 /*
 134  * struct crypto_engine - crypto hardware engine
 135  * @name: the engine name
 136  * @idling: the engine is entering idle state
 137  * @busy: request pump is busy
 138  * @running: the engine is on working
 139  * @cur_req_prepared: current request is prepared
 140  * @list: link with the global crypto engine list
 141  * @queue_lock: spinlock to syncronise access to request queue
 142  * @queue: the crypto queue of the engine
 143  * @rt: whether this queue is set to run as a realtime task
 144  * @prepare_crypt_hardware: a request will soon arrive from the queue
 145  * so the subsystem requests the driver to prepare the hardware
 146  * by issuing this call
 147  * @unprepare_crypt_hardware: there are currently no more requests on the
 148  * queue so the subsystem notifies the driver that it may relax the
 149  * hardware by issuing this call
 150  * @prepare_request: do some prepare if need before handle the current request
 151  * @unprepare_request: undo any work done by prepare_message()
 152  * @crypt_one_request: do encryption for current request
 153  * @kworker: thread struct for request pump
 154  * @kworker_task: pointer to task for request pump kworker thread
 155  * @pump_requests: work struct for scheduling work to the request pump
 156  * @priv_data: the engine private data
 157  * @cur_req: the current request which is on processing
 158  */
 159 struct crypto_engine {
 160         char                    name[ENGINE_NAME_LEN];
 161         bool                    idling;
 162         bool                    busy;
 163         bool                    running;
 164         bool                    cur_req_prepared;
 165
 166         struct list_head        list;
 167         spinlock_t              queue_lock;
 168         struct crypto_queue     queue;
 169
 170         bool                    rt;
 171
 172         int (*prepare_crypt_hardware)(struct crypto_engine *engine);
 173         int (*unprepare_crypt_hardware)(struct crypto_engine *engine);
 174
 175         int (*prepare_request)(struct crypto_engine *engine,
 176                                struct ablkcipher_request *req);
 177         int (*unprepare_request)(struct crypto_engine *engine,
 178                                  struct ablkcipher_request *req);
 179         int (*crypt_one_request)(struct crypto_engine *engine,
 180                                  struct ablkcipher_request *req);
 181
 182         struct kthread_worker           kworker;
 183         struct task_struct              *kworker_task;
 184         struct kthread_work             pump_requests;
 185
 186         void                            *priv_data;
 187         struct ablkcipher_request       *cur_req;
 188 };
 189
 190 int crypto_transfer_request(struct crypto_engine *engine,
 191                             struct ablkcipher_request *req, bool need_pump);
 192 int crypto_transfer_request_to_engine(struct crypto_engine *engine,
 193                                       struct ablkcipher_request *req);
 194 void crypto_finalize_request(struct crypto_engine *engine,
 195                              struct ablkcipher_request *req, int err);
 196 int crypto_engine_start(struct crypto_engine *engine);
 197 int crypto_engine_stop(struct crypto_engine *engine);
 198 struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt);
 199 int crypto_engine_exit(struct crypto_engine *engine);
 200
 201 extern const struct crypto_type crypto_ablkcipher_type;
 202 extern const struct crypto_type crypto_blkcipher_type;
 203
 204 void crypto_mod_put(struct crypto_alg *alg);
 205
 206 int crypto_register_template(struct crypto_template *tmpl);
 207 void crypto_unregister_template(struct crypto_template *tmpl);
 208 struct crypto_template *crypto_lookup_template(const char *name);
 209
 210 int crypto_register_instance(struct crypto_template *tmpl,
 211                              struct crypto_instance *inst);
 212 int crypto_unregister_instance(struct crypto_instance *inst);
 213
 214 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 215                       struct crypto_instance *inst, u32 mask);
 216 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 217                        struct crypto_instance *inst,
 218                        const struct crypto_type *frontend);
 219 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 220                       u32 type, u32 mask);
 221
 222 void crypto_drop_spawn(struct crypto_spawn *spawn);
 223 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 224                                     u32 mask);
 225 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
 226
 227 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
 228                                     struct crypto_instance *inst)
 229 {
 230         spawn->inst = inst;
 231 }
 232
 233 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
 234 int crypto_check_attr_type(struct rtattr **tb, u32 type);
 235 const char *crypto_attr_alg_name(struct rtattr *rta);
 236 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 237                                     const struct crypto_type *frontend,
 238                                     u32 type, u32 mask);
 239
 240 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
 241                                                  u32 type, u32 mask)
 242 {
 243         return crypto_attr_alg2(rta, NULL, type, mask);
 244 }
 245
 246 int crypto_attr_u32(struct rtattr *rta, u32 *num);
 247 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 248                         struct crypto_alg *alg);
 249 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 250                              unsigned int head);
 251 struct crypto_instance *crypto_alloc_instance(const char *name,
 252                                               struct crypto_alg *alg);
 253
 254 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
 255 int crypto_enqueue_request(struct crypto_queue *queue,
 256                            struct crypto_async_request *request);
 257 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
 258 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
 259 static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
 260 {
 261         return queue->qlen;
 262 }
 263
 264 /* These functions require the input/output to be aligned as u32. */
 265 void crypto_inc(u8 *a, unsigned int size);
 266 void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
 267
 268 int blkcipher_walk_done(struct blkcipher_desc *desc,
 269                         struct blkcipher_walk *walk, int err);
 270 int blkcipher_walk_virt(struct blkcipher_desc *desc,
 271                         struct blkcipher_walk *walk);
 272 int blkcipher_walk_phys(struct blkcipher_desc *desc,
 273                         struct blkcipher_walk *walk);
 274 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
 275                               struct blkcipher_walk *walk,
 276                               unsigned int blocksize);
 277 int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
 278                                    struct blkcipher_walk *walk,
 279                                    struct crypto_aead *tfm,
 280                                    unsigned int blocksize);
 281
 282 int ablkcipher_walk_done(struct ablkcipher_request *req,
 283                          struct ablkcipher_walk *walk, int err);
 284 int ablkcipher_walk_phys(struct ablkcipher_request *req,
 285                          struct ablkcipher_walk *walk);
 286 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
 287
 288 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
 289 {
 290         return PTR_ALIGN(crypto_tfm_ctx(tfm),
 291                          crypto_tfm_alg_alignmask(tfm) + 1);
 292 }
 293
 294 static inline struct crypto_instance *crypto_tfm_alg_instance(
 295         struct crypto_tfm *tfm)
 296 {
 297         return container_of(tfm->__crt_alg, struct crypto_instance, alg);
 298 }
 299
 300 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 301 {
 302         return inst->__ctx;
 303 }
 304
 305 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
 306         struct crypto_ablkcipher *tfm)
 307 {
 308         return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
 309 }
 310
 311 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
 312 {
 313         return crypto_tfm_ctx(&tfm->base);
 314 }
 315
 316 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
 317 {
 318         return crypto_tfm_ctx_aligned(&tfm->base);
 319 }
 320
 321 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
 322         struct crypto_spawn *spawn)
 323 {
 324         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
 325         u32 mask = CRYPTO_ALG_TYPE_MASK;
 326
 327         return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
 328 }
 329
 330 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
 331 {
 332         return crypto_tfm_ctx(&tfm->base);
 333 }
 334
 335 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
 336 {
 337         return crypto_tfm_ctx_aligned(&tfm->base);
 338 }
 339
 340 static inline struct crypto_cipher *crypto_spawn_cipher(
 341         struct crypto_spawn *spawn)
 342 {
 343         u32 type = CRYPTO_ALG_TYPE_CIPHER;
 344         u32 mask = CRYPTO_ALG_TYPE_MASK;
 345
 346         return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
 347 }
 348
 349 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
 350 {
 351         return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
 352 }
 353
 354 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
 355                                        struct scatterlist *dst,
 356                                        struct scatterlist *src,
 357                                        unsigned int nbytes)
 358 {
 359         walk->in.sg = src;
 360         walk->out.sg = dst;
 361         walk->total = nbytes;
 362 }
 363
 364 static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
 365                                         struct scatterlist *dst,
 366                                         struct scatterlist *src,
 367                                         unsigned int nbytes)
 368 {
 369         walk->in.sg = src;
 370         walk->out.sg = dst;
 371         walk->total = nbytes;
 372         INIT_LIST_HEAD(&walk->buffers);
 373 }
 374
 375 static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
 376 {
 377         if (unlikely(!list_empty(&walk->buffers)))
 378                 __ablkcipher_walk_complete(walk);
 379 }
 380
 381 static inline struct crypto_async_request *crypto_get_backlog(
 382         struct crypto_queue *queue)
 383 {
 384         return queue->backlog == &queue->list ? NULL :
 385                container_of(queue->backlog, struct crypto_async_request, list);
 386 }
 387
 388 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
 389                                              struct ablkcipher_request *request)
 390 {
 391         return crypto_enqueue_request(queue, &request->base);
 392 }
 393
 394 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
 395         struct crypto_queue *queue)
 396 {
 397         return ablkcipher_request_cast(crypto_dequeue_request(queue));
 398 }
 399
 400 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
 401 {
 402         return req->__ctx;
 403 }
 404
 405 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
 406                                           struct crypto_ablkcipher *tfm)
 407 {
 408         return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
 409 }
 410
 411 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
 412                                                      u32 type, u32 mask)
 413 {
 414         return crypto_attr_alg(tb[1], type, mask);
 415 }
 416
 417 /*
 418  * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
 419  * Otherwise returns zero.
 420  */
 421 static inline int crypto_requires_sync(u32 type, u32 mask)
 422 {
 423         return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
 424 }
 425
 426 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
 427
 428 /**
 429  * crypto_memneq - Compare two areas of memory without leaking
 430  *                 timing information.
 431  *
 432  * @a: One area of memory
 433  * @b: Another area of memory
 434  * @size: The size of the area.
 435  *
 436  * Returns 0 when data is equal, 1 otherwise.
 437  */
 438 static inline int crypto_memneq(const void *a, const void *b, size_t size)
 439 {
 440         return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
 441 }
 442
 443 static inline void crypto_yield(u32 flags)
 444 {
 445 #if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY)
 446         if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
 447                 cond_resched();
 448 #endif
 449 }
 450
 451 #endif  /* _CRYPTO_ALGAPI_H */