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 /*
  21  * Maximum values for blocksize and alignmask, used to allocate
  22  * static buffers that are big enough for any combination of
  23  * algs and architectures. Ciphers have a lower maximum size.
  24  */
  25 #define MAX_ALGAPI_BLOCKSIZE            160
  26 #define MAX_ALGAPI_ALIGNMASK            63
  27 #define MAX_CIPHER_BLOCKSIZE            16
  28 #define MAX_CIPHER_ALIGNMASK            15
  29
  30 struct crypto_aead;
  31 struct crypto_instance;
  32 struct module;
  33 struct rtattr;
  34 struct seq_file;
  35
  36 struct crypto_type {
  37         unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
  38         unsigned int (*extsize)(struct crypto_alg *alg);
  39         int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
  40         int (*init_tfm)(struct crypto_tfm *tfm);
  41         void (*show)(struct seq_file *m, struct crypto_alg *alg);
  42         int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
  43         void (*free)(struct crypto_instance *inst);
  44
  45         unsigned int type;
  46         unsigned int maskclear;
  47         unsigned int maskset;
  48         unsigned int tfmsize;
  49 };
  50
  51 struct crypto_instance {
  52         struct crypto_alg alg;
  53
  54         struct crypto_template *tmpl;
  55         struct hlist_node list;
  56
  57         void *__ctx[] CRYPTO_MINALIGN_ATTR;
  58 };
  59
  60 struct crypto_template {
  61         struct list_head list;
  62         struct hlist_head instances;
  63         struct module *module;
  64
  65         struct crypto_instance *(*alloc)(struct rtattr **tb);
  66         void (*free)(struct crypto_instance *inst);
  67         int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
  68
  69         char name[CRYPTO_MAX_ALG_NAME];
  70 };
  71
  72 struct crypto_spawn {
  73         struct list_head list;
  74         struct crypto_alg *alg;
  75         struct crypto_instance *inst;
  76         const struct crypto_type *frontend;
  77         u32 mask;
  78 };
  79
  80 struct crypto_queue {
  81         struct list_head list;
  82         struct list_head *backlog;
  83
  84         unsigned int qlen;
  85         unsigned int max_qlen;
  86 };
  87
  88 struct scatter_walk {
  89         struct scatterlist *sg;
  90         unsigned int offset;
  91 };
  92
  93 struct blkcipher_walk {
  94         union {
  95                 struct {
  96                         struct page *page;
  97                         unsigned long offset;
  98                 } phys;
  99
 100                 struct {
 101                         u8 *page;
 102                         u8 *addr;
 103                 } virt;
 104         } src, dst;
 105
 106         struct scatter_walk in;
 107         unsigned int nbytes;
 108
 109         struct scatter_walk out;
 110         unsigned int total;
 111
 112         void *page;
 113         u8 *buffer;
 114         u8 *iv;
 115         unsigned int ivsize;
 116
 117         int flags;
 118         unsigned int walk_blocksize;
 119         unsigned int cipher_blocksize;
 120         unsigned int alignmask;
 121 };
 122
 123 struct ablkcipher_walk {
 124         struct {
 125                 struct page *page;
 126                 unsigned int offset;
 127         } src, dst;
 128
 129         struct scatter_walk     in;
 130         unsigned int            nbytes;
 131         struct scatter_walk     out;
 132         unsigned int            total;
 133         struct list_head        buffers;
 134         u8                      *iv_buffer;
 135         u8                      *iv;
 136         int                     flags;
 137         unsigned int            blocksize;
 138 };
 139
 140 extern const struct crypto_type crypto_ablkcipher_type;
 141 extern const struct crypto_type crypto_blkcipher_type;
 142
 143 void crypto_mod_put(struct crypto_alg *alg);
 144
 145 int crypto_register_template(struct crypto_template *tmpl);
 146 int crypto_register_templates(struct crypto_template *tmpls, int count);
 147 void crypto_unregister_template(struct crypto_template *tmpl);
 148 void crypto_unregister_templates(struct crypto_template *tmpls, int count);
 149 struct crypto_template *crypto_lookup_template(const char *name);
 150
 151 int crypto_register_instance(struct crypto_template *tmpl,
 152                              struct crypto_instance *inst);
 153 int crypto_unregister_instance(struct crypto_instance *inst);
 154
 155 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 156                       struct crypto_instance *inst, u32 mask);
 157 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 158                        struct crypto_instance *inst,
 159                        const struct crypto_type *frontend);
 160 int crypto_grab_spawn(struct crypto_spawn *spawn, const char *name,
 161                       u32 type, u32 mask);
 162
 163 void crypto_drop_spawn(struct crypto_spawn *spawn);
 164 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 165                                     u32 mask);
 166 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
 167
 168 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
 169                                     struct crypto_instance *inst)
 170 {
 171         spawn->inst = inst;
 172 }
 173
 174 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
 175 int crypto_check_attr_type(struct rtattr **tb, u32 type);
 176 const char *crypto_attr_alg_name(struct rtattr *rta);
 177 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 178                                     const struct crypto_type *frontend,
 179                                     u32 type, u32 mask);
 180
 181 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
 182                                                  u32 type, u32 mask)
 183 {
 184         return crypto_attr_alg2(rta, NULL, type, mask);
 185 }
 186
 187 int crypto_attr_u32(struct rtattr *rta, u32 *num);
 188 int crypto_inst_setname(struct crypto_instance *inst, const char *name,
 189                         struct crypto_alg *alg);
 190 void *crypto_alloc_instance(const char *name, struct crypto_alg *alg,
 191                             unsigned int head);
 192
 193 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
 194 int crypto_enqueue_request(struct crypto_queue *queue,
 195                            struct crypto_async_request *request);
 196 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
 197 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
 198 static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
 199 {
 200         return queue->qlen;
 201 }
 202
 203 void crypto_inc(u8 *a, unsigned int size);
 204 void __crypto_xor(u8 *dst, const u8 *src1, const u8 *src2, unsigned int size);
 205
 206 static inline void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
 207 {
 208         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
 209             __builtin_constant_p(size) &&
 210             (size % sizeof(unsigned long)) == 0) {
 211                 unsigned long *d = (unsigned long *)dst;
 212                 unsigned long *s = (unsigned long *)src;
 213
 214                 while (size > 0) {
 215                         *d++ ^= *s++;
 216                         size -= sizeof(unsigned long);
 217                 }
 218         } else {
 219                 __crypto_xor(dst, dst, src, size);
 220         }
 221 }
 222
 223 static inline void crypto_xor_cpy(u8 *dst, const u8 *src1, const u8 *src2,
 224                                   unsigned int size)
 225 {
 226         if (IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
 227             __builtin_constant_p(size) &&
 228             (size % sizeof(unsigned long)) == 0) {
 229                 unsigned long *d = (unsigned long *)dst;
 230                 unsigned long *s1 = (unsigned long *)src1;
 231                 unsigned long *s2 = (unsigned long *)src2;
 232
 233                 while (size > 0) {
 234                         *d++ = *s1++ ^ *s2++;
 235                         size -= sizeof(unsigned long);
 236                 }
 237         } else {
 238                 __crypto_xor(dst, src1, src2, size);
 239         }
 240 }
 241
 242 int blkcipher_walk_done(struct blkcipher_desc *desc,
 243                         struct blkcipher_walk *walk, int err);
 244 int blkcipher_walk_virt(struct blkcipher_desc *desc,
 245                         struct blkcipher_walk *walk);
 246 int blkcipher_walk_phys(struct blkcipher_desc *desc,
 247                         struct blkcipher_walk *walk);
 248 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
 249                               struct blkcipher_walk *walk,
 250                               unsigned int blocksize);
 251 int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
 252                                    struct blkcipher_walk *walk,
 253                                    struct crypto_aead *tfm,
 254                                    unsigned int blocksize);
 255
 256 int ablkcipher_walk_done(struct ablkcipher_request *req,
 257                          struct ablkcipher_walk *walk, int err);
 258 int ablkcipher_walk_phys(struct ablkcipher_request *req,
 259                          struct ablkcipher_walk *walk);
 260 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
 261
 262 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
 263 {
 264         return PTR_ALIGN(crypto_tfm_ctx(tfm),
 265                          crypto_tfm_alg_alignmask(tfm) + 1);
 266 }
 267
 268 static inline struct crypto_instance *crypto_tfm_alg_instance(
 269         struct crypto_tfm *tfm)
 270 {
 271         return container_of(tfm->__crt_alg, struct crypto_instance, alg);
 272 }
 273
 274 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 275 {
 276         return inst->__ctx;
 277 }
 278
 279 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
 280         struct crypto_ablkcipher *tfm)
 281 {
 282         return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
 283 }
 284
 285 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
 286 {
 287         return crypto_tfm_ctx(&tfm->base);
 288 }
 289
 290 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
 291 {
 292         return crypto_tfm_ctx_aligned(&tfm->base);
 293 }
 294
 295 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
 296         struct crypto_spawn *spawn)
 297 {
 298         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
 299         u32 mask = CRYPTO_ALG_TYPE_MASK;
 300
 301         return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
 302 }
 303
 304 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
 305 {
 306         return crypto_tfm_ctx(&tfm->base);
 307 }
 308
 309 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
 310 {
 311         return crypto_tfm_ctx_aligned(&tfm->base);
 312 }
 313
 314 static inline struct crypto_cipher *crypto_spawn_cipher(
 315         struct crypto_spawn *spawn)
 316 {
 317         u32 type = CRYPTO_ALG_TYPE_CIPHER;
 318         u32 mask = CRYPTO_ALG_TYPE_MASK;
 319
 320         return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
 321 }
 322
 323 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
 324 {
 325         return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
 326 }
 327
 328 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
 329                                        struct scatterlist *dst,
 330                                        struct scatterlist *src,
 331                                        unsigned int nbytes)
 332 {
 333         walk->in.sg = src;
 334         walk->out.sg = dst;
 335         walk->total = nbytes;
 336 }
 337
 338 static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
 339                                         struct scatterlist *dst,
 340                                         struct scatterlist *src,
 341                                         unsigned int nbytes)
 342 {
 343         walk->in.sg = src;
 344         walk->out.sg = dst;
 345         walk->total = nbytes;
 346         INIT_LIST_HEAD(&walk->buffers);
 347 }
 348
 349 static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
 350 {
 351         if (unlikely(!list_empty(&walk->buffers)))
 352                 __ablkcipher_walk_complete(walk);
 353 }
 354
 355 static inline struct crypto_async_request *crypto_get_backlog(
 356         struct crypto_queue *queue)
 357 {
 358         return queue->backlog == &queue->list ? NULL :
 359                container_of(queue->backlog, struct crypto_async_request, list);
 360 }
 361
 362 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
 363                                              struct ablkcipher_request *request)
 364 {
 365         return crypto_enqueue_request(queue, &request->base);
 366 }
 367
 368 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
 369         struct crypto_queue *queue)
 370 {
 371         return ablkcipher_request_cast(crypto_dequeue_request(queue));
 372 }
 373
 374 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
 375 {
 376         return req->__ctx;
 377 }
 378
 379 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
 380                                           struct crypto_ablkcipher *tfm)
 381 {
 382         return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
 383 }
 384
 385 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
 386                                                      u32 type, u32 mask)
 387 {
 388         return crypto_attr_alg(tb[1], type, mask);
 389 }
 390
 391 static inline int crypto_requires_off(u32 type, u32 mask, u32 off)
 392 {
 393         return (type ^ off) & mask & off;
 394 }
 395
 396 /*
 397  * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
 398  * Otherwise returns zero.
 399  */
 400 static inline int crypto_requires_sync(u32 type, u32 mask)
 401 {
 402         return crypto_requires_off(type, mask, CRYPTO_ALG_ASYNC);
 403 }
 404
 405 noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);
 406
 407 /**
 408  * crypto_memneq - Compare two areas of memory without leaking
 409  *                 timing information.
 410  *
 411  * @a: One area of memory
 412  * @b: Another area of memory
 413  * @size: The size of the area.
 414  *
 415  * Returns 0 when data is equal, 1 otherwise.
 416  */
 417 static inline int crypto_memneq(const void *a, const void *b, size_t size)
 418 {
 419         return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
 420 }
 421
 422 static inline void crypto_yield(u32 flags)
 423 {
 424 #if !defined(CONFIG_PREEMPT) || defined(CONFIG_PREEMPT_VOLUNTARY)
 425         if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
 426                 cond_resched();
 427 #endif
 428 }
 429
 430 int crypto_register_notifier(struct notifier_block *nb);
 431 int crypto_unregister_notifier(struct notifier_block *nb);
 432
 433 /* Crypto notification events. */
 434 enum {
 435         CRYPTO_MSG_ALG_REQUEST,
 436         CRYPTO_MSG_ALG_REGISTER,
 437         CRYPTO_MSG_ALG_LOADED,
 438 };
 439
 440 #endif  /* _CRYPTO_ALGAPI_H */