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 module;
  21 struct rtattr;
  22 struct seq_file;
  23
  24 struct 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
  39 struct 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
  48 struct 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
  60 struct 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
  68 struct crypto_queue {
  69         struct list_head list;
  70         struct list_head *backlog;
  71
  72         unsigned int qlen;
  73         unsigned int max_qlen;
  74 };
  75
  76 struct scatter_walk {
  77         struct scatterlist *sg;
  78         unsigned int offset;
  79 };
  80
  81 struct 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
 108 struct 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
 125 extern const struct crypto_type crypto_ablkcipher_type;
 126 extern const struct crypto_type crypto_aead_type;
 127 extern const struct crypto_type crypto_blkcipher_type;
 128
 129 void crypto_mod_put(struct crypto_alg *alg);
 130
 131 int crypto_register_template(struct crypto_template *tmpl);
 132 void crypto_unregister_template(struct crypto_template *tmpl);
 133 struct crypto_template *crypto_lookup_template(const char *name);
 134
 135 int crypto_register_instance(struct crypto_template *tmpl,
 136                              struct crypto_instance *inst);
 137
 138 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 139                       struct crypto_instance *inst, u32 mask);
 140 int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
 141                        struct crypto_instance *inst,
 142                        const struct crypto_type *frontend);
 143
 144 void crypto_drop_spawn(struct crypto_spawn *spawn);
 145 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 146                                     u32 mask);
 147 void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
 148
 149 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
 150                                     struct crypto_instance *inst)
 151 {
 152         spawn->inst = inst;
 153 }
 154
 155 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
 156 int crypto_check_attr_type(struct rtattr **tb, u32 type);
 157 const char *crypto_attr_alg_name(struct rtattr *rta);
 158 struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
 159                                     const struct crypto_type *frontend,
 160                                     u32 type, u32 mask);
 161
 162 static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
 163                                                  u32 type, u32 mask)
 164 {
 165         return crypto_attr_alg2(rta, NULL, type, mask);
 166 }
 167
 168 int crypto_attr_u32(struct rtattr *rta, u32 *num);
 169 void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
 170                              unsigned int head);
 171 struct crypto_instance *crypto_alloc_instance(const char *name,
 172                                               struct crypto_alg *alg);
 173
 174 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
 175 int crypto_enqueue_request(struct crypto_queue *queue,
 176                            struct crypto_async_request *request);
 177 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset);
 178 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
 179 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
 180
 181 /* These functions require the input/output to be aligned as u32. */
 182 void crypto_inc(u8 *a, unsigned int size);
 183 void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
 184
 185 int blkcipher_walk_done(struct blkcipher_desc *desc,
 186                         struct blkcipher_walk *walk, int err);
 187 int blkcipher_walk_virt(struct blkcipher_desc *desc,
 188                         struct blkcipher_walk *walk);
 189 int blkcipher_walk_phys(struct blkcipher_desc *desc,
 190                         struct blkcipher_walk *walk);
 191 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
 192                               struct blkcipher_walk *walk,
 193                               unsigned int blocksize);
 194
 195 int ablkcipher_walk_done(struct ablkcipher_request *req,
 196                          struct ablkcipher_walk *walk, int err);
 197 int ablkcipher_walk_phys(struct ablkcipher_request *req,
 198                          struct ablkcipher_walk *walk);
 199 void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);
 200
 201 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
 202 {
 203         return PTR_ALIGN(crypto_tfm_ctx(tfm),
 204                          crypto_tfm_alg_alignmask(tfm) + 1);
 205 }
 206
 207 static inline struct crypto_instance *crypto_tfm_alg_instance(
 208         struct crypto_tfm *tfm)
 209 {
 210         return container_of(tfm->__crt_alg, struct crypto_instance, alg);
 211 }
 212
 213 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 214 {
 215         return inst->__ctx;
 216 }
 217
 218 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
 219         struct crypto_ablkcipher *tfm)
 220 {
 221         return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
 222 }
 223
 224 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
 225 {
 226         return crypto_tfm_ctx(&tfm->base);
 227 }
 228
 229 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
 230 {
 231         return crypto_tfm_ctx_aligned(&tfm->base);
 232 }
 233
 234 static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm)
 235 {
 236         return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead;
 237 }
 238
 239 static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
 240 {
 241         return crypto_tfm_ctx(&tfm->base);
 242 }
 243
 244 static inline struct crypto_instance *crypto_aead_alg_instance(
 245         struct crypto_aead *aead)
 246 {
 247         return crypto_tfm_alg_instance(&aead->base);
 248 }
 249
 250 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
 251         struct crypto_spawn *spawn)
 252 {
 253         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
 254         u32 mask = CRYPTO_ALG_TYPE_MASK;
 255
 256         return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
 257 }
 258
 259 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
 260 {
 261         return crypto_tfm_ctx(&tfm->base);
 262 }
 263
 264 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
 265 {
 266         return crypto_tfm_ctx_aligned(&tfm->base);
 267 }
 268
 269 static inline struct crypto_cipher *crypto_spawn_cipher(
 270         struct crypto_spawn *spawn)
 271 {
 272         u32 type = CRYPTO_ALG_TYPE_CIPHER;
 273         u32 mask = CRYPTO_ALG_TYPE_MASK;
 274
 275         return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
 276 }
 277
 278 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
 279 {
 280         return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
 281 }
 282
 283 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
 284 {
 285         u32 type = CRYPTO_ALG_TYPE_HASH;
 286         u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
 287
 288         return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
 289 }
 290
 291 static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
 292 {
 293         return crypto_tfm_ctx(&tfm->base);
 294 }
 295
 296 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
 297 {
 298         return crypto_tfm_ctx_aligned(&tfm->base);
 299 }
 300
 301 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
 302                                        struct scatterlist *dst,
 303                                        struct scatterlist *src,
 304                                        unsigned int nbytes)
 305 {
 306         walk->in.sg = src;
 307         walk->out.sg = dst;
 308         walk->total = nbytes;
 309 }
 310
 311 static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
 312                                         struct scatterlist *dst,
 313                                         struct scatterlist *src,
 314                                         unsigned int nbytes)
 315 {
 316         walk->in.sg = src;
 317         walk->out.sg = dst;
 318         walk->total = nbytes;
 319         INIT_LIST_HEAD(&walk->buffers);
 320 }
 321
 322 static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
 323 {
 324         if (unlikely(!list_empty(&walk->buffers)))
 325                 __ablkcipher_walk_complete(walk);
 326 }
 327
 328 static inline struct crypto_async_request *crypto_get_backlog(
 329         struct crypto_queue *queue)
 330 {
 331         return queue->backlog == &queue->list ? NULL :
 332                container_of(queue->backlog, struct crypto_async_request, list);
 333 }
 334
 335 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
 336                                              struct ablkcipher_request *request)
 337 {
 338         return crypto_enqueue_request(queue, &request->base);
 339 }
 340
 341 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
 342         struct crypto_queue *queue)
 343 {
 344         return ablkcipher_request_cast(crypto_dequeue_request(queue));
 345 }
 346
 347 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
 348 {
 349         return req->__ctx;
 350 }
 351
 352 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
 353                                           struct crypto_ablkcipher *tfm)
 354 {
 355         return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
 356 }
 357
 358 static inline void *aead_request_ctx(struct aead_request *req)
 359 {
 360         return req->__ctx;
 361 }
 362
 363 static inline void aead_request_complete(struct aead_request *req, int err)
 364 {
 365         req->base.complete(&req->base, err);
 366 }
 367
 368 static inline u32 aead_request_flags(struct aead_request *req)
 369 {
 370         return req->base.flags;
 371 }
 372
 373 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
 374                                                      u32 type, u32 mask)
 375 {
 376         return crypto_attr_alg(tb[1], type, mask);
 377 }
 378
 379 /*
 380  * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
 381  * Otherwise returns zero.
 382  */
 383 static inline int crypto_requires_sync(u32 type, u32 mask)
 384 {
 385         return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
 386 }
 387
 388 #endif  /* _CRYPTO_ALGAPI_H */
 389