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
  19 struct module;
  20 struct rtattr;
  21 struct seq_file;
  22
  23 struct crypto_type {
  24         unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
  25         unsigned int (*extsize)(struct crypto_alg *alg,
  26                                 const struct crypto_type *frontend);
  27         int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
  28         int (*init_tfm)(struct crypto_tfm *tfm,
  29                         const struct crypto_type *frontend);
  30         void (*show)(struct seq_file *m, 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
  56         char name[CRYPTO_MAX_ALG_NAME];
  57 };
  58
  59 struct crypto_spawn {
  60         struct list_head list;
  61         struct crypto_alg *alg;
  62         struct crypto_instance *inst;
  63         u32 mask;
  64 };
  65
  66 struct crypto_queue {
  67         struct list_head list;
  68         struct list_head *backlog;
  69
  70         unsigned int qlen;
  71         unsigned int max_qlen;
  72 };
  73
  74 struct scatter_walk {
  75         struct scatterlist *sg;
  76         unsigned int offset;
  77 };
  78
  79 struct blkcipher_walk {
  80         union {
  81                 struct {
  82                         struct page *page;
  83                         unsigned long offset;
  84                 } phys;
  85
  86                 struct {
  87                         u8 *page;
  88                         u8 *addr;
  89                 } virt;
  90         } src, dst;
  91
  92         struct scatter_walk in;
  93         unsigned int nbytes;
  94
  95         struct scatter_walk out;
  96         unsigned int total;
  97
  98         void *page;
  99         u8 *buffer;
 100         u8 *iv;
 101
 102         int flags;
 103         unsigned int blocksize;
 104 };
 105
 106 extern const struct crypto_type crypto_ablkcipher_type;
 107 extern const struct crypto_type crypto_aead_type;
 108 extern const struct crypto_type crypto_blkcipher_type;
 109 extern const struct crypto_type crypto_hash_type;
 110
 111 void crypto_mod_put(struct crypto_alg *alg);
 112
 113 int crypto_register_template(struct crypto_template *tmpl);
 114 void crypto_unregister_template(struct crypto_template *tmpl);
 115 struct crypto_template *crypto_lookup_template(const char *name);
 116
 117 int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
 118                       struct crypto_instance *inst, u32 mask);
 119 void crypto_drop_spawn(struct crypto_spawn *spawn);
 120 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
 121                                     u32 mask);
 122
 123 static inline void crypto_set_spawn(struct crypto_spawn *spawn,
 124                                     struct crypto_instance *inst)
 125 {
 126         spawn->inst = inst;
 127 }
 128
 129 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
 130 int crypto_check_attr_type(struct rtattr **tb, u32 type);
 131 const char *crypto_attr_alg_name(struct rtattr *rta);
 132 struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask);
 133 int crypto_attr_u32(struct rtattr *rta, u32 *num);
 134 struct crypto_instance *crypto_alloc_instance(const char *name,
 135                                               struct crypto_alg *alg);
 136
 137 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
 138 int crypto_enqueue_request(struct crypto_queue *queue,
 139                            struct crypto_async_request *request);
 140 void *__crypto_dequeue_request(struct crypto_queue *queue, unsigned int offset);
 141 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
 142 int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
 143
 144 /* These functions require the input/output to be aligned as u32. */
 145 void crypto_inc(u8 *a, unsigned int size);
 146 void crypto_xor(u8 *dst, const u8 *src, unsigned int size);
 147
 148 int blkcipher_walk_done(struct blkcipher_desc *desc,
 149                         struct blkcipher_walk *walk, int err);
 150 int blkcipher_walk_virt(struct blkcipher_desc *desc,
 151                         struct blkcipher_walk *walk);
 152 int blkcipher_walk_phys(struct blkcipher_desc *desc,
 153                         struct blkcipher_walk *walk);
 154 int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
 155                               struct blkcipher_walk *walk,
 156                               unsigned int blocksize);
 157
 158 static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
 159 {
 160         unsigned long addr = (unsigned long)crypto_tfm_ctx(tfm);
 161         unsigned long align = crypto_tfm_alg_alignmask(tfm);
 162
 163         if (align <= crypto_tfm_ctx_alignment())
 164                 align = 1;
 165         return (void *)ALIGN(addr, align);
 166 }
 167
 168 static inline struct crypto_instance *crypto_tfm_alg_instance(
 169         struct crypto_tfm *tfm)
 170 {
 171         return container_of(tfm->__crt_alg, struct crypto_instance, alg);
 172 }
 173
 174 static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 175 {
 176         return inst->__ctx;
 177 }
 178
 179 static inline struct ablkcipher_alg *crypto_ablkcipher_alg(
 180         struct crypto_ablkcipher *tfm)
 181 {
 182         return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
 183 }
 184
 185 static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
 186 {
 187         return crypto_tfm_ctx(&tfm->base);
 188 }
 189
 190 static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
 191 {
 192         return crypto_tfm_ctx_aligned(&tfm->base);
 193 }
 194
 195 static inline struct aead_alg *crypto_aead_alg(struct crypto_aead *tfm)
 196 {
 197         return &crypto_aead_tfm(tfm)->__crt_alg->cra_aead;
 198 }
 199
 200 static inline void *crypto_aead_ctx(struct crypto_aead *tfm)
 201 {
 202         return crypto_tfm_ctx(&tfm->base);
 203 }
 204
 205 static inline struct crypto_instance *crypto_aead_alg_instance(
 206         struct crypto_aead *aead)
 207 {
 208         return crypto_tfm_alg_instance(&aead->base);
 209 }
 210
 211 static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
 212         struct crypto_spawn *spawn)
 213 {
 214         u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
 215         u32 mask = CRYPTO_ALG_TYPE_MASK;
 216
 217         return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
 218 }
 219
 220 static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
 221 {
 222         return crypto_tfm_ctx(&tfm->base);
 223 }
 224
 225 static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
 226 {
 227         return crypto_tfm_ctx_aligned(&tfm->base);
 228 }
 229
 230 static inline struct crypto_cipher *crypto_spawn_cipher(
 231         struct crypto_spawn *spawn)
 232 {
 233         u32 type = CRYPTO_ALG_TYPE_CIPHER;
 234         u32 mask = CRYPTO_ALG_TYPE_MASK;
 235
 236         return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
 237 }
 238
 239 static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
 240 {
 241         return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
 242 }
 243
 244 static inline struct crypto_hash *crypto_spawn_hash(struct crypto_spawn *spawn)
 245 {
 246         u32 type = CRYPTO_ALG_TYPE_HASH;
 247         u32 mask = CRYPTO_ALG_TYPE_HASH_MASK;
 248
 249         return __crypto_hash_cast(crypto_spawn_tfm(spawn, type, mask));
 250 }
 251
 252 static inline void *crypto_hash_ctx(struct crypto_hash *tfm)
 253 {
 254         return crypto_tfm_ctx(&tfm->base);
 255 }
 256
 257 static inline void *crypto_hash_ctx_aligned(struct crypto_hash *tfm)
 258 {
 259         return crypto_tfm_ctx_aligned(&tfm->base);
 260 }
 261
 262 static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
 263                                        struct scatterlist *dst,
 264                                        struct scatterlist *src,
 265                                        unsigned int nbytes)
 266 {
 267         walk->in.sg = src;
 268         walk->out.sg = dst;
 269         walk->total = nbytes;
 270 }
 271
 272 static inline struct crypto_async_request *crypto_get_backlog(
 273         struct crypto_queue *queue)
 274 {
 275         return queue->backlog == &queue->list ? NULL :
 276                container_of(queue->backlog, struct crypto_async_request, list);
 277 }
 278
 279 static inline int ablkcipher_enqueue_request(struct crypto_queue *queue,
 280                                              struct ablkcipher_request *request)
 281 {
 282         return crypto_enqueue_request(queue, &request->base);
 283 }
 284
 285 static inline struct ablkcipher_request *ablkcipher_dequeue_request(
 286         struct crypto_queue *queue)
 287 {
 288         return ablkcipher_request_cast(crypto_dequeue_request(queue));
 289 }
 290
 291 static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
 292 {
 293         return req->__ctx;
 294 }
 295
 296 static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
 297                                           struct crypto_ablkcipher *tfm)
 298 {
 299         return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
 300 }
 301
 302 static inline void *aead_request_ctx(struct aead_request *req)
 303 {
 304         return req->__ctx;
 305 }
 306
 307 static inline void aead_request_complete(struct aead_request *req, int err)
 308 {
 309         req->base.complete(&req->base, err);
 310 }
 311
 312 static inline u32 aead_request_flags(struct aead_request *req)
 313 {
 314         return req->base.flags;
 315 }
 316
 317 static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
 318                                                      u32 type, u32 mask)
 319 {
 320         return crypto_attr_alg(tb[1], type, mask);
 321 }
 322
 323 /*
 324  * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
 325  * Otherwise returns zero.
 326  */
 327 static inline int crypto_requires_sync(u32 type, u32 mask)
 328 {
 329         return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
 330 }
 331
 332 #endif  /* _CRYPTO_ALGAPI_H */
 333