drivers/staging/rtl8192u/ieee80211/rtl_crypto.h

   1 /*
   2  * Scatterlist Cryptographic API.
   3  *
   4  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   5  * Copyright (c) 2002 David S. Miller (davem@redhat.com)
   6  *
   7  * Portions derived from Cryptoapi, by Alexander Kjeldaas <astor@fast.no>
   8  * and Nettle, by Niels M鰈ler.
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  *
  15  */
  16 #ifndef _LINUX_CRYPTO_H
  17 #define _LINUX_CRYPTO_H
  18
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/types.h>
  22 #include <linux/list.h>
  23 #include <linux/string.h>
  24 #include <asm/page.h>
  25 #include <asm/errno.h>
  26
  27 #define crypto_register_alg crypto_register_alg_rsl
  28 #define crypto_unregister_alg crypto_unregister_alg_rsl
  29 #define crypto_alloc_tfm crypto_alloc_tfm_rsl
  30 #define crypto_free_tfm crypto_free_tfm_rsl
  31 #define crypto_alg_available crypto_alg_available_rsl
  32
  33 /*
  34  * Algorithm masks and types.
  35  */
  36 #define CRYPTO_ALG_TYPE_MASK            0x000000ff
  37 #define CRYPTO_ALG_TYPE_CIPHER          0x00000001
  38 #define CRYPTO_ALG_TYPE_DIGEST          0x00000002
  39 #define CRYPTO_ALG_TYPE_COMPRESS        0x00000004
  40
  41 /*
  42  * Transform masks and values (for crt_flags).
  43  */
  44 #define CRYPTO_TFM_MODE_MASK            0x000000ff
  45 #define CRYPTO_TFM_REQ_MASK             0x000fff00
  46 #define CRYPTO_TFM_RES_MASK             0xfff00000
  47
  48 #define CRYPTO_TFM_MODE_ECB             0x00000001
  49 #define CRYPTO_TFM_MODE_CBC             0x00000002
  50 #define CRYPTO_TFM_MODE_CFB             0x00000004
  51 #define CRYPTO_TFM_MODE_CTR             0x00000008
  52
  53 #define CRYPTO_TFM_REQ_WEAK_KEY         0x00000100
  54 #define CRYPTO_TFM_RES_WEAK_KEY         0x00100000
  55 #define CRYPTO_TFM_RES_BAD_KEY_LEN      0x00200000
  56 #define CRYPTO_TFM_RES_BAD_KEY_SCHED    0x00400000
  57 #define CRYPTO_TFM_RES_BAD_BLOCK_LEN    0x00800000
  58 #define CRYPTO_TFM_RES_BAD_FLAGS        0x01000000
  59
  60 /*
  61  * Miscellaneous stuff.
  62  */
  63 #define CRYPTO_UNSPEC                   0
  64 #define CRYPTO_MAX_ALG_NAME             64
  65
  66 struct scatterlist;
  67
  68 /*
  69  * Algorithms: modular crypto algorithm implementations, managed
  70  * via crypto_register_alg() and crypto_unregister_alg().
  71  */
  72 struct cipher_alg {
  73         unsigned int cia_min_keysize;
  74         unsigned int cia_max_keysize;
  75         int (*cia_setkey)(void *ctx, const u8 *key,
  76                           unsigned int keylen, u32 *flags);
  77         void (*cia_encrypt)(void *ctx, u8 *dst, const u8 *src);
  78         void (*cia_decrypt)(void *ctx, u8 *dst, const u8 *src);
  79 };
  80
  81 struct digest_alg {
  82         unsigned int dia_digestsize;
  83         void (*dia_init)(void *ctx);
  84         void (*dia_update)(void *ctx, const u8 *data, unsigned int len);
  85         void (*dia_final)(void *ctx, u8 *out);
  86         int (*dia_setkey)(void *ctx, const u8 *key,
  87                           unsigned int keylen, u32 *flags);
  88 };
  89
  90 struct compress_alg {
  91         int (*coa_init)(void *ctx);
  92         void (*coa_exit)(void *ctx);
  93         int (*coa_compress)(void *ctx, const u8 *src, unsigned int slen,
  94                             u8 *dst, unsigned int *dlen);
  95         int (*coa_decompress)(void *ctx, const u8 *src, unsigned int slen,
  96                               u8 *dst, unsigned int *dlen);
  97 };
  98
  99 #define cra_cipher      cra_u.cipher
 100 #define cra_digest      cra_u.digest
 101 #define cra_compress    cra_u.compress
 102
 103 struct crypto_alg {
 104         struct list_head cra_list;
 105         u32 cra_flags;
 106         unsigned int cra_blocksize;
 107         unsigned int cra_ctxsize;
 108         const char cra_name[CRYPTO_MAX_ALG_NAME];
 109
 110         union {
 111                 struct cipher_alg cipher;
 112                 struct digest_alg digest;
 113                 struct compress_alg compress;
 114         } cra_u;
 115
 116         struct module *cra_module;
 117 };
 118
 119 /*
 120  * Algorithm registration interface.
 121  */
 122 int crypto_register_alg(struct crypto_alg *alg);
 123 int crypto_unregister_alg(struct crypto_alg *alg);
 124
 125 /*
 126  * Algorithm query interface.
 127  */
 128 int crypto_alg_available(const char *name, u32 flags);
 129
 130 /*
 131  * Transforms: user-instantiated objects which encapsulate algorithms
 132  * and core processing logic.  Managed via crypto_alloc_tfm() and
 133  * crypto_free_tfm(), as well as the various helpers below.
 134  */
 135 struct crypto_tfm;
 136
 137 struct cipher_tfm {
 138         void *cit_iv;
 139         unsigned int cit_ivsize;
 140         u32 cit_mode;
 141         int (*cit_setkey)(struct crypto_tfm *tfm,
 142                           const u8 *key, unsigned int keylen);
 143         int (*cit_encrypt)(struct crypto_tfm *tfm,
 144                            struct scatterlist *dst,
 145                            struct scatterlist *src,
 146                            unsigned int nbytes);
 147         int (*cit_encrypt_iv)(struct crypto_tfm *tfm,
 148                               struct scatterlist *dst,
 149                               struct scatterlist *src,
 150                               unsigned int nbytes, u8 *iv);
 151         int (*cit_decrypt)(struct crypto_tfm *tfm,
 152                            struct scatterlist *dst,
 153                            struct scatterlist *src,
 154                            unsigned int nbytes);
 155         int (*cit_decrypt_iv)(struct crypto_tfm *tfm,
 156                            struct scatterlist *dst,
 157                            struct scatterlist *src,
 158                            unsigned int nbytes, u8 *iv);
 159         void (*cit_xor_block)(u8 *dst, const u8 *src);
 160 };
 161
 162 struct digest_tfm {
 163         void (*dit_init)(struct crypto_tfm *tfm);
 164         void (*dit_update)(struct crypto_tfm *tfm,
 165                            struct scatterlist *sg, unsigned int nsg);
 166         void (*dit_final)(struct crypto_tfm *tfm, u8 *out);
 167         void (*dit_digest)(struct crypto_tfm *tfm, struct scatterlist *sg,
 168                            unsigned int nsg, u8 *out);
 169         int (*dit_setkey)(struct crypto_tfm *tfm,
 170                           const u8 *key, unsigned int keylen);
 171 #ifdef CONFIG_CRYPTO_HMAC
 172         void *dit_hmac_block;
 173 #endif
 174 };
 175
 176 struct compress_tfm {
 177         int (*cot_compress)(struct crypto_tfm *tfm,
 178                             const u8 *src, unsigned int slen,
 179                             u8 *dst, unsigned int *dlen);
 180         int (*cot_decompress)(struct crypto_tfm *tfm,
 181                               const u8 *src, unsigned int slen,
 182                               u8 *dst, unsigned int *dlen);
 183 };
 184
 185 #define crt_cipher      crt_u.cipher
 186 #define crt_digest      crt_u.digest
 187 #define crt_compress    crt_u.compress
 188
 189 struct crypto_tfm {
 190
 191         u32 crt_flags;
 192
 193         union {
 194                 struct cipher_tfm cipher;
 195                 struct digest_tfm digest;
 196                 struct compress_tfm compress;
 197         } crt_u;
 198
 199         struct crypto_alg *__crt_alg;
 200 };
 201
 202 /*
 203  * Transform user interface.
 204  */
 205
 206 /*
 207  * crypto_alloc_tfm() will first attempt to locate an already loaded algorithm.
 208  * If that fails and the kernel supports dynamically loadable modules, it
 209  * will then attempt to load a module of the same name or alias.  A refcount
 210  * is grabbed on the algorithm which is then associated with the new transform.
 211  *
 212  * crypto_free_tfm() frees up the transform and any associated resources,
 213  * then drops the refcount on the associated algorithm.
 214  */
 215 struct crypto_tfm *crypto_alloc_tfm(const char *alg_name, u32 tfm_flags);
 216 void crypto_free_tfm(struct crypto_tfm *tfm);
 217
 218 /*
 219  * Transform helpers which query the underlying algorithm.
 220  */
 221 static inline const char *crypto_tfm_alg_name(struct crypto_tfm *tfm)
 222 {
 223         return tfm->__crt_alg->cra_name;
 224 }
 225
 226 static inline const char *crypto_tfm_alg_modname(struct crypto_tfm *tfm)
 227 {
 228         struct crypto_alg *alg = tfm->__crt_alg;
 229
 230         if (alg->cra_module)
 231                 return alg->cra_module->name;
 232         else
 233                 return NULL;
 234 }
 235
 236 static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
 237 {
 238         return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
 239 }
 240
 241 static inline unsigned int crypto_tfm_alg_min_keysize(struct crypto_tfm *tfm)
 242 {
 243         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 244         return tfm->__crt_alg->cra_cipher.cia_min_keysize;
 245 }
 246
 247 static inline unsigned int crypto_tfm_alg_max_keysize(struct crypto_tfm *tfm)
 248 {
 249         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 250         return tfm->__crt_alg->cra_cipher.cia_max_keysize;
 251 }
 252
 253 static inline unsigned int crypto_tfm_alg_ivsize(struct crypto_tfm *tfm)
 254 {
 255         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 256         return tfm->crt_cipher.cit_ivsize;
 257 }
 258
 259 static inline unsigned int crypto_tfm_alg_blocksize(struct crypto_tfm *tfm)
 260 {
 261         return tfm->__crt_alg->cra_blocksize;
 262 }
 263
 264 static inline unsigned int crypto_tfm_alg_digestsize(struct crypto_tfm *tfm)
 265 {
 266         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 267         return tfm->__crt_alg->cra_digest.dia_digestsize;
 268 }
 269
 270 /*
 271  * API wrappers.
 272  */
 273 static inline void crypto_digest_init(struct crypto_tfm *tfm)
 274 {
 275         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 276         tfm->crt_digest.dit_init(tfm);
 277 }
 278
 279 static inline void crypto_digest_update(struct crypto_tfm *tfm,
 280                                         struct scatterlist *sg,
 281                                         unsigned int nsg)
 282 {
 283         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 284         tfm->crt_digest.dit_update(tfm, sg, nsg);
 285 }
 286
 287 static inline void crypto_digest_final(struct crypto_tfm *tfm, u8 *out)
 288 {
 289         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 290         tfm->crt_digest.dit_final(tfm, out);
 291 }
 292
 293 static inline void crypto_digest_digest(struct crypto_tfm *tfm,
 294                                         struct scatterlist *sg,
 295                                         unsigned int nsg, u8 *out)
 296 {
 297         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 298         tfm->crt_digest.dit_digest(tfm, sg, nsg, out);
 299 }
 300
 301 static inline int crypto_digest_setkey(struct crypto_tfm *tfm,
 302                                        const u8 *key, unsigned int keylen)
 303 {
 304         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_DIGEST);
 305         if (tfm->crt_digest.dit_setkey == NULL)
 306                 return -ENOSYS;
 307         return tfm->crt_digest.dit_setkey(tfm, key, keylen);
 308 }
 309
 310 static inline int crypto_cipher_setkey(struct crypto_tfm *tfm,
 311                                        const u8 *key, unsigned int keylen)
 312 {
 313         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 314         return tfm->crt_cipher.cit_setkey(tfm, key, keylen);
 315 }
 316
 317 static inline int crypto_cipher_encrypt(struct crypto_tfm *tfm,
 318                                         struct scatterlist *dst,
 319                                         struct scatterlist *src,
 320                                         unsigned int nbytes)
 321 {
 322         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 323         return tfm->crt_cipher.cit_encrypt(tfm, dst, src, nbytes);
 324 }
 325
 326 static inline int crypto_cipher_encrypt_iv(struct crypto_tfm *tfm,
 327                                            struct scatterlist *dst,
 328                                            struct scatterlist *src,
 329                                            unsigned int nbytes, u8 *iv)
 330 {
 331         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 332         BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
 333         return tfm->crt_cipher.cit_encrypt_iv(tfm, dst, src, nbytes, iv);
 334 }
 335
 336 static inline int crypto_cipher_decrypt(struct crypto_tfm *tfm,
 337                                         struct scatterlist *dst,
 338                                         struct scatterlist *src,
 339                                         unsigned int nbytes)
 340 {
 341         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 342         return tfm->crt_cipher.cit_decrypt(tfm, dst, src, nbytes);
 343 }
 344
 345 static inline int crypto_cipher_decrypt_iv(struct crypto_tfm *tfm,
 346                                            struct scatterlist *dst,
 347                                            struct scatterlist *src,
 348                                            unsigned int nbytes, u8 *iv)
 349 {
 350         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 351         BUG_ON(tfm->crt_cipher.cit_mode == CRYPTO_TFM_MODE_ECB);
 352         return tfm->crt_cipher.cit_decrypt_iv(tfm, dst, src, nbytes, iv);
 353 }
 354
 355 static inline void crypto_cipher_set_iv(struct crypto_tfm *tfm,
 356                                         const u8 *src, unsigned int len)
 357 {
 358         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 359         memcpy(tfm->crt_cipher.cit_iv, src, len);
 360 }
 361
 362 static inline void crypto_cipher_get_iv(struct crypto_tfm *tfm,
 363                                         u8 *dst, unsigned int len)
 364 {
 365         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_CIPHER);
 366         memcpy(dst, tfm->crt_cipher.cit_iv, len);
 367 }
 368
 369 static inline int crypto_comp_compress(struct crypto_tfm *tfm,
 370                                        const u8 *src, unsigned int slen,
 371                                        u8 *dst, unsigned int *dlen)
 372 {
 373         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
 374         return tfm->crt_compress.cot_compress(tfm, src, slen, dst, dlen);
 375 }
 376
 377 static inline int crypto_comp_decompress(struct crypto_tfm *tfm,
 378                                          const u8 *src, unsigned int slen,
 379                                          u8 *dst, unsigned int *dlen)
 380 {
 381         BUG_ON(crypto_tfm_alg_type(tfm) != CRYPTO_ALG_TYPE_COMPRESS);
 382         return tfm->crt_compress.cot_decompress(tfm, src, slen, dst, dlen);
 383 }
 384
 385 /*
 386  * HMAC support.
 387  */
 388 #ifdef CONFIG_CRYPTO_HMAC
 389 void crypto_hmac_init(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen);
 390 void crypto_hmac_update(struct crypto_tfm *tfm,
 391                         struct scatterlist *sg, unsigned int nsg);
 392 void crypto_hmac_final(struct crypto_tfm *tfm, u8 *key,
 393                        unsigned int *keylen, u8 *out);
 394 void crypto_hmac(struct crypto_tfm *tfm, u8 *key, unsigned int *keylen,
 395                  struct scatterlist *sg, unsigned int nsg, u8 *out);
 396 #endif  /* CONFIG_CRYPTO_HMAC */
 397
 398 #endif  /* _LINUX_CRYPTO_H */
 399