include/crypto/hash.h

   1 /*
   2  * Hash: Hash algorithms under the crypto API
   3  *
   4  * Copyright (c) 2008 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
  13 #ifndef _CRYPTO_HASH_H
  14 #define _CRYPTO_HASH_H
  15
  16 #include <linux/crypto.h>
  17
  18 struct crypto_ahash;
  19
  20 struct hash_alg_common {
  21         unsigned int digestsize;
  22         unsigned int statesize;
  23
  24         struct crypto_alg base;
  25 };
  26
  27 struct ahash_request {
  28         struct crypto_async_request base;
  29
  30         unsigned int nbytes;
  31         struct scatterlist *src;
  32         u8 *result;
  33
  34         /* This field may only be used by the ahash API code. */
  35         void *priv;
  36
  37         void *__ctx[] CRYPTO_MINALIGN_ATTR;
  38 };
  39
  40 struct ahash_alg {
  41         int (*init)(struct ahash_request *req);
  42         int (*update)(struct ahash_request *req);
  43         int (*final)(struct ahash_request *req);
  44         int (*finup)(struct ahash_request *req);
  45         int (*digest)(struct ahash_request *req);
  46         int (*export)(struct ahash_request *req, void *out);
  47         int (*import)(struct ahash_request *req, const void *in);
  48         int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
  49                       unsigned int keylen);
  50
  51         struct hash_alg_common halg;
  52 };
  53
  54 struct shash_desc {
  55         struct crypto_shash *tfm;
  56         u32 flags;
  57
  58         void *__ctx[] CRYPTO_MINALIGN_ATTR;
  59 };
  60
  61 #define SHASH_DESC_ON_STACK(shash, ctx)                           \
  62         char __##shash##_desc[sizeof(struct shash_desc) +         \
  63                 crypto_shash_descsize(ctx)] CRYPTO_MINALIGN_ATTR; \
  64         struct shash_desc *shash = (struct shash_desc *)__##shash##_desc
  65
  66 struct shash_alg {
  67         int (*init)(struct shash_desc *desc);
  68         int (*update)(struct shash_desc *desc, const u8 *data,
  69                       unsigned int len);
  70         int (*final)(struct shash_desc *desc, u8 *out);
  71         int (*finup)(struct shash_desc *desc, const u8 *data,
  72                      unsigned int len, u8 *out);
  73         int (*digest)(struct shash_desc *desc, const u8 *data,
  74                       unsigned int len, u8 *out);
  75         int (*export)(struct shash_desc *desc, void *out);
  76         int (*import)(struct shash_desc *desc, const void *in);
  77         int (*setkey)(struct crypto_shash *tfm, const u8 *key,
  78                       unsigned int keylen);
  79
  80         unsigned int descsize;
  81
  82         /* These fields must match hash_alg_common. */
  83         unsigned int digestsize
  84                 __attribute__ ((aligned(__alignof__(struct hash_alg_common))));
  85         unsigned int statesize;
  86
  87         struct crypto_alg base;
  88 };
  89
  90 struct crypto_ahash {
  91         int (*init)(struct ahash_request *req);
  92         int (*update)(struct ahash_request *req);
  93         int (*final)(struct ahash_request *req);
  94         int (*finup)(struct ahash_request *req);
  95         int (*digest)(struct ahash_request *req);
  96         int (*export)(struct ahash_request *req, void *out);
  97         int (*import)(struct ahash_request *req, const void *in);
  98         int (*setkey)(struct crypto_ahash *tfm, const u8 *key,
  99                       unsigned int keylen);
 100
 101         unsigned int reqsize;
 102         struct crypto_tfm base;
 103 };
 104
 105 struct crypto_shash {
 106         unsigned int descsize;
 107         struct crypto_tfm base;
 108 };
 109
 110 static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm)
 111 {
 112         return container_of(tfm, struct crypto_ahash, base);
 113 }
 114
 115 struct crypto_ahash *crypto_alloc_ahash(const char *alg_name, u32 type,
 116                                         u32 mask);
 117
 118 static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm)
 119 {
 120         return &tfm->base;
 121 }
 122
 123 static inline void crypto_free_ahash(struct crypto_ahash *tfm)
 124 {
 125         crypto_destroy_tfm(tfm, crypto_ahash_tfm(tfm));
 126 }
 127
 128 static inline unsigned int crypto_ahash_alignmask(
 129         struct crypto_ahash *tfm)
 130 {
 131         return crypto_tfm_alg_alignmask(crypto_ahash_tfm(tfm));
 132 }
 133
 134 static inline struct hash_alg_common *__crypto_hash_alg_common(
 135         struct crypto_alg *alg)
 136 {
 137         return container_of(alg, struct hash_alg_common, base);
 138 }
 139
 140 static inline struct hash_alg_common *crypto_hash_alg_common(
 141         struct crypto_ahash *tfm)
 142 {
 143         return __crypto_hash_alg_common(crypto_ahash_tfm(tfm)->__crt_alg);
 144 }
 145
 146 static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
 147 {
 148         return crypto_hash_alg_common(tfm)->digestsize;
 149 }
 150
 151 static inline unsigned int crypto_ahash_statesize(struct crypto_ahash *tfm)
 152 {
 153         return crypto_hash_alg_common(tfm)->statesize;
 154 }
 155
 156 static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm)
 157 {
 158         return crypto_tfm_get_flags(crypto_ahash_tfm(tfm));
 159 }
 160
 161 static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags)
 162 {
 163         crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags);
 164 }
 165
 166 static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags)
 167 {
 168         crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags);
 169 }
 170
 171 static inline struct crypto_ahash *crypto_ahash_reqtfm(
 172         struct ahash_request *req)
 173 {
 174         return __crypto_ahash_cast(req->base.tfm);
 175 }
 176
 177 static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
 178 {
 179         return tfm->reqsize;
 180 }
 181
 182 static inline void *ahash_request_ctx(struct ahash_request *req)
 183 {
 184         return req->__ctx;
 185 }
 186
 187 int crypto_ahash_setkey(struct crypto_ahash *tfm, const u8 *key,
 188                         unsigned int keylen);
 189 int crypto_ahash_finup(struct ahash_request *req);
 190 int crypto_ahash_final(struct ahash_request *req);
 191 int crypto_ahash_digest(struct ahash_request *req);
 192
 193 static inline int crypto_ahash_export(struct ahash_request *req, void *out)
 194 {
 195         return crypto_ahash_reqtfm(req)->export(req, out);
 196 }
 197
 198 static inline int crypto_ahash_import(struct ahash_request *req, const void *in)
 199 {
 200         return crypto_ahash_reqtfm(req)->import(req, in);
 201 }
 202
 203 static inline int crypto_ahash_init(struct ahash_request *req)
 204 {
 205         return crypto_ahash_reqtfm(req)->init(req);
 206 }
 207
 208 static inline int crypto_ahash_update(struct ahash_request *req)
 209 {
 210         return crypto_ahash_reqtfm(req)->update(req);
 211 }
 212
 213 static inline void ahash_request_set_tfm(struct ahash_request *req,
 214                                          struct crypto_ahash *tfm)
 215 {
 216         req->base.tfm = crypto_ahash_tfm(tfm);
 217 }
 218
 219 static inline struct ahash_request *ahash_request_alloc(
 220         struct crypto_ahash *tfm, gfp_t gfp)
 221 {
 222         struct ahash_request *req;
 223
 224         req = kmalloc(sizeof(struct ahash_request) +
 225                       crypto_ahash_reqsize(tfm), gfp);
 226
 227         if (likely(req))
 228                 ahash_request_set_tfm(req, tfm);
 229
 230         return req;
 231 }
 232
 233 static inline void ahash_request_free(struct ahash_request *req)
 234 {
 235         kzfree(req);
 236 }
 237
 238 static inline struct ahash_request *ahash_request_cast(
 239         struct crypto_async_request *req)
 240 {
 241         return container_of(req, struct ahash_request, base);
 242 }
 243
 244 static inline void ahash_request_set_callback(struct ahash_request *req,
 245                                               u32 flags,
 246                                               crypto_completion_t compl,
 247                                               void *data)
 248 {
 249         req->base.complete = compl;
 250         req->base.data = data;
 251         req->base.flags = flags;
 252 }
 253
 254 static inline void ahash_request_set_crypt(struct ahash_request *req,
 255                                            struct scatterlist *src, u8 *result,
 256                                            unsigned int nbytes)
 257 {
 258         req->src = src;
 259         req->nbytes = nbytes;
 260         req->result = result;
 261 }
 262
 263 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
 264                                         u32 mask);
 265
 266 static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm)
 267 {
 268         return &tfm->base;
 269 }
 270
 271 static inline void crypto_free_shash(struct crypto_shash *tfm)
 272 {
 273         crypto_destroy_tfm(tfm, crypto_shash_tfm(tfm));
 274 }
 275
 276 static inline unsigned int crypto_shash_alignmask(
 277         struct crypto_shash *tfm)
 278 {
 279         return crypto_tfm_alg_alignmask(crypto_shash_tfm(tfm));
 280 }
 281
 282 static inline unsigned int crypto_shash_blocksize(struct crypto_shash *tfm)
 283 {
 284         return crypto_tfm_alg_blocksize(crypto_shash_tfm(tfm));
 285 }
 286
 287 static inline struct shash_alg *__crypto_shash_alg(struct crypto_alg *alg)
 288 {
 289         return container_of(alg, struct shash_alg, base);
 290 }
 291
 292 static inline struct shash_alg *crypto_shash_alg(struct crypto_shash *tfm)
 293 {
 294         return __crypto_shash_alg(crypto_shash_tfm(tfm)->__crt_alg);
 295 }
 296
 297 static inline unsigned int crypto_shash_digestsize(struct crypto_shash *tfm)
 298 {
 299         return crypto_shash_alg(tfm)->digestsize;
 300 }
 301
 302 static inline unsigned int crypto_shash_statesize(struct crypto_shash *tfm)
 303 {
 304         return crypto_shash_alg(tfm)->statesize;
 305 }
 306
 307 static inline u32 crypto_shash_get_flags(struct crypto_shash *tfm)
 308 {
 309         return crypto_tfm_get_flags(crypto_shash_tfm(tfm));
 310 }
 311
 312 static inline void crypto_shash_set_flags(struct crypto_shash *tfm, u32 flags)
 313 {
 314         crypto_tfm_set_flags(crypto_shash_tfm(tfm), flags);
 315 }
 316
 317 static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags)
 318 {
 319         crypto_tfm_clear_flags(crypto_shash_tfm(tfm), flags);
 320 }
 321
 322 static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm)
 323 {
 324         return tfm->descsize;
 325 }
 326
 327 static inline void *shash_desc_ctx(struct shash_desc *desc)
 328 {
 329         return desc->__ctx;
 330 }
 331
 332 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
 333                         unsigned int keylen);
 334 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
 335                         unsigned int len, u8 *out);
 336
 337 static inline int crypto_shash_export(struct shash_desc *desc, void *out)
 338 {
 339         return crypto_shash_alg(desc->tfm)->export(desc, out);
 340 }
 341
 342 static inline int crypto_shash_import(struct shash_desc *desc, const void *in)
 343 {
 344         return crypto_shash_alg(desc->tfm)->import(desc, in);
 345 }
 346
 347 static inline int crypto_shash_init(struct shash_desc *desc)
 348 {
 349         return crypto_shash_alg(desc->tfm)->init(desc);
 350 }
 351
 352 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
 353                         unsigned int len);
 354 int crypto_shash_final(struct shash_desc *desc, u8 *out);
 355 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
 356                        unsigned int len, u8 *out);
 357
 358 #endif  /* _CRYPTO_HASH_H */