linux/include/crypto/algapi.h
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   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
  20struct module;
  21struct rtattr;
  22struct seq_file;
  23
  24struct 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
  39struct 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
  48struct 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
  60struct 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
  68struct crypto_queue {
  69        struct list_head list;
  70        struct list_head *backlog;
  71
  72        unsigned int qlen;
  73        unsigned int max_qlen;
  74};
  75
  76struct scatter_walk {
  77        struct scatterlist *sg;
  78        unsigned int offset;
  79};
  80
  81struct 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
 108struct 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
 125extern const struct crypto_type crypto_ablkcipher_type;
 126extern const struct crypto_type crypto_aead_type;
 127extern const struct crypto_type crypto_blkcipher_type;
 128
 129void crypto_mod_put(struct crypto_alg *alg);
 130
 131int crypto_register_template(struct crypto_template *tmpl);
 132void crypto_unregister_template(struct crypto_template *tmpl);
 133struct crypto_template *crypto_lookup_template(const char *name);
 134
 135int crypto_register_instance(struct crypto_template *tmpl,
 136                             struct crypto_instance *inst);
 137int crypto_unregister_instance(struct crypto_alg *alg);
 138
 139int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 140                      struct crypto_instance *inst, u32 mask);
 141int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 142                       struct crypto_instance *inst,
 143                       const struct crypto_type *frontend);
 144
 145void crypto_drop_spawn(struct crypto_spawn *spawn);
 146struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 147                                    u32 mask);
 148void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
 149
 150static inline void crypto_set_spawn(struct crypto_spawn *spawn,
 151                                    struct crypto_instance *inst)
 152{
 153        spawn->inst = inst;
 154}
 155
 156struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
 157int crypto_check_attr_type(struct rtattr **tb, u32 type);
 158const char *crypto_attr_alg_name(struct rtattr *rta);
 159struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 160                                    const struct crypto_type *frontend,
 161                                    u32 type, u32 mask);
 162
 163static 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
 169int crypto_attr_u32(struct rtattr *rta, u32 *num);
 170void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 171                             unsigned int head);
 172struct crypto_instance *crypto_alloc_instance(const char *name,
 173                                              struct crypto_alg *alg);
 174
 175void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
 176int crypto_enqueue_request(struct crypto_queue *queue,
 177                           struct crypto_async_request *request);
 178void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset);
 179struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
 180int 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. */
 183void crypto_inc(u8 *a, unsigned int size);
 184void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
 185
 186int blkcipher_walk_done(struct blkcipher_desc *desc,
 187                        struct blkcipher_walk *walk, int err);
 188int blkcipher_walk_virt(struct blkcipher_desc *desc,
 189                        struct blkcipher_walk *walk);
 190int blkcipher_walk_phys(struct blkcipher_desc *desc,
 191                        struct blkcipher_walk *walk);
 192int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
 193                              struct blkcipher_walk *walk,
 194                              unsigned int blocksize);
 195
 196int ablkcipher_walk_done(struct ablkcipher_request *req,
 197                         struct ablkcipher_walk *walk, int err);
 198int ablkcipher_walk_phys(struct ablkcipher_request *req,
 199                         struct ablkcipher_walk *walk);
 200void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
 201
 202static 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
 208static 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
 214static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 215{
 216        return inst->__ctx;
 217}
 218
 219static 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
 225static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
 226{
 227        return crypto_tfm_ctx(&tfm->base);
 228}
 229
 230static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
 231{
 232        return crypto_tfm_ctx_aligned(&tfm->base);
 233}
 234
 235static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm)
 236{
 237        return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead;
 238}
 239
 240static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
 241{
 242        return crypto_tfm_ctx(&tfm->base);
 243}
 244
 245static inline struct crypto_instance *crypto_aead_alg_instance(
 246        struct crypto_aead *aead)
 247{
 248        return crypto_tfm_alg_instance(&aead->base);
 249}
 250
 251static 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
 260static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
 261{
 262        return crypto_tfm_ctx(&tfm->base);
 263}
 264
 265static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
 266{
 267        return crypto_tfm_ctx_aligned(&tfm->base);
 268}
 269
 270static 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
 279static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
 280{
 281        return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
 282}
 283
 284static 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
 292static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
 293{
 294        return crypto_tfm_ctx(&tfm->base);
 295}
 296
 297static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
 298{
 299        return crypto_tfm_ctx_aligned(&tfm->base);
 300}
 301
 302static 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
 312static 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
 323static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
 324{
 325        if (unlikely(!list_empty(&walk->buffers)))
 326                __ablkcipher_walk_complete(walk);
 327}
 328
 329static 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
 336static 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
 342static inline struct ablkcipher_request *ablkcipher_dequeue_request(
 343        struct crypto_queue *queue)
 344{
 345        return ablkcipher_request_cast(crypto_dequeue_request(queue));
 346}
 347
 348static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
 349{
 350        return req->__ctx;
 351}
 352
 353static 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
 359static inline void *aead_request_ctx(struct aead_request *req)
 360{
 361        return req->__ctx;
 362}
 363
 364static inline void aead_request_complete(struct aead_request *req, int err)
 365{
 366        req->base.complete(&req->base, err);
 367}
 368
 369static inline u32 aead_request_flags(struct aead_request *req)
 370{
 371        return req->base.flags;
 372}
 373
 374static 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 */
 384static inline int crypto_requires_sync(u32 type, u32 mask)
 385{
 386        return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
 387}
 388
 389#endif  /* _CRYPTO_ALGAPI_H */
 390
 391
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