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