git.sesse.net Git - bcachefs-tools-debian/blob - 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 #include <linux/string.h>
  18
  19 struct hash_alg_common {
  20         unsigned int digestsize;
  21         unsigned int statesize;
  22
  23         struct crypto_alg base;
  24 };
  25
  26 struct shash_desc {
  27         struct crypto_shash *tfm;
  28         u32 flags;
  29
  30         void *__ctx[] CRYPTO_MINALIGN_ATTR;
  31 };
  32
  33 #define SHASH_DESC_ON_STACK(shash, ctx)                           \
  34         char __##shash##_desc[sizeof(struct shash_desc) +         \
  35                 crypto_shash_descsize(ctx)] CRYPTO_MINALIGN_ATTR; \
  36         struct shash_desc *shash = (struct shash_desc *)__##shash##_desc
  37
  38 struct shash_alg {
  39         int (*init)(struct shash_desc *desc);
  40         int (*update)(struct shash_desc *desc, const u8 *data,
  41                       unsigned int len);
  42         int (*final)(struct shash_desc *desc, u8 *out);
  43         int (*finup)(struct shash_desc *desc, const u8 *data,
  44                      unsigned int len, u8 *out);
  45         int (*digest)(struct shash_desc *desc, const u8 *data,
  46                       unsigned int len, u8 *out);
  47         int (*export)(struct shash_desc *desc, void *out);
  48         int (*import)(struct shash_desc *desc, const void *in);
  49         int (*setkey)(struct crypto_shash *tfm, const u8 *key,
  50                       unsigned int keylen);
  51
  52         unsigned int descsize;
  53
  54         /* These fields must match hash_alg_common. */
  55         unsigned int digestsize
  56                 __attribute__ ((aligned(__alignof__(struct hash_alg_common))));
  57         unsigned int statesize;
  58
  59         struct crypto_alg base;
  60 };
  61
  62 struct crypto_shash {
  63         unsigned int descsize;
  64         struct crypto_tfm base;
  65 };
  66
  67 struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
  68                                         u32 mask);
  69
  70 static inline struct crypto_tfm *crypto_shash_tfm(struct crypto_shash *tfm)
  71 {
  72         return &tfm->base;
  73 }
  74
  75 static inline void crypto_free_shash(struct crypto_shash *tfm)
  76 {
  77         crypto_destroy_tfm(tfm, crypto_shash_tfm(tfm));
  78 }
  79
  80 static inline const char *crypto_shash_alg_name(struct crypto_shash *tfm)
  81 {
  82         return crypto_tfm_alg_name(crypto_shash_tfm(tfm));
  83 }
  84
  85 static inline const char *crypto_shash_driver_name(struct crypto_shash *tfm)
  86 {
  87         return crypto_tfm_alg_driver_name(crypto_shash_tfm(tfm));
  88 }
  89
  90 static inline unsigned int crypto_shash_alignmask(
  91         struct crypto_shash *tfm)
  92 {
  93         return crypto_tfm_alg_alignmask(crypto_shash_tfm(tfm));
  94 }
  95
  96 static inline unsigned int crypto_shash_blocksize(struct crypto_shash *tfm)
  97 {
  98         return crypto_tfm_alg_blocksize(crypto_shash_tfm(tfm));
  99 }
 100
 101 static inline struct shash_alg *__crypto_shash_alg(struct crypto_alg *alg)
 102 {
 103         return container_of(alg, struct shash_alg, base);
 104 }
 105
 106 static inline struct shash_alg *crypto_shash_alg(struct crypto_shash *tfm)
 107 {
 108         return __crypto_shash_alg(crypto_shash_tfm(tfm)->__crt_alg);
 109 }
 110
 111 static inline unsigned int crypto_shash_digestsize(struct crypto_shash *tfm)
 112 {
 113         return crypto_shash_alg(tfm)->digestsize;
 114 }
 115
 116 static inline unsigned int crypto_shash_statesize(struct crypto_shash *tfm)
 117 {
 118         return crypto_shash_alg(tfm)->statesize;
 119 }
 120
 121 static inline u32 crypto_shash_get_flags(struct crypto_shash *tfm)
 122 {
 123         return crypto_tfm_get_flags(crypto_shash_tfm(tfm));
 124 }
 125
 126 static inline void crypto_shash_set_flags(struct crypto_shash *tfm, u32 flags)
 127 {
 128         crypto_tfm_set_flags(crypto_shash_tfm(tfm), flags);
 129 }
 130
 131 static inline void crypto_shash_clear_flags(struct crypto_shash *tfm, u32 flags)
 132 {
 133         crypto_tfm_clear_flags(crypto_shash_tfm(tfm), flags);
 134 }
 135
 136 static inline unsigned int crypto_shash_descsize(struct crypto_shash *tfm)
 137 {
 138         return tfm->descsize;
 139 }
 140
 141 static inline void *shash_desc_ctx(struct shash_desc *desc)
 142 {
 143         return desc->__ctx;
 144 }
 145
 146 int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
 147                         unsigned int keylen);
 148
 149 int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
 150                         unsigned int len, u8 *out);
 151
 152 static inline int crypto_shash_export(struct shash_desc *desc, void *out)
 153 {
 154         return crypto_shash_alg(desc->tfm)->export(desc, out);
 155 }
 156
 157 static inline int crypto_shash_import(struct shash_desc *desc, const void *in)
 158 {
 159         return crypto_shash_alg(desc->tfm)->import(desc, in);
 160 }
 161
 162 static inline int crypto_shash_init(struct shash_desc *desc)
 163 {
 164         return crypto_shash_alg(desc->tfm)->init(desc);
 165 }
 166
 167 int crypto_shash_update(struct shash_desc *desc, const u8 *data,
 168                         unsigned int len);
 169
 170 int crypto_shash_final(struct shash_desc *desc, u8 *out);
 171
 172 int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
 173                        unsigned int len, u8 *out);
 174
 175 static inline void shash_desc_zero(struct shash_desc *desc)
 176 {
 177         memzero_explicit(desc,
 178                          sizeof(*desc) + crypto_shash_descsize(desc->tfm));
 179 }
 180
 181 #endif  /* _CRYPTO_HASH_H */