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         struct crypto_tfm base;
  20 };
  21
  22 static inline struct crypto_ahash *__crypto_ahash_cast(struct crypto_tfm *tfm)
  23 {
  24         return (struct crypto_ahash *)tfm;
  25 }
  26
  27 static inline struct crypto_ahash *crypto_alloc_ahash(const char *alg_name,
  28                                                       u32 type, u32 mask)
  29 {
  30         type &= ~CRYPTO_ALG_TYPE_MASK;
  31         mask &= ~CRYPTO_ALG_TYPE_MASK;
  32         type |= CRYPTO_ALG_TYPE_AHASH;
  33         mask |= CRYPTO_ALG_TYPE_AHASH_MASK;
  34
  35         return __crypto_ahash_cast(crypto_alloc_base(alg_name, type, mask));
  36 }
  37
  38 static inline struct crypto_tfm *crypto_ahash_tfm(struct crypto_ahash *tfm)
  39 {
  40         return &tfm->base;
  41 }
  42
  43 static inline void crypto_free_ahash(struct crypto_ahash *tfm)
  44 {
  45         crypto_free_tfm(crypto_ahash_tfm(tfm));
  46 }
  47
  48 static inline unsigned int crypto_ahash_alignmask(
  49         struct crypto_ahash *tfm)
  50 {
  51         return crypto_tfm_alg_alignmask(crypto_ahash_tfm(tfm));
  52 }
  53
  54 static inline struct ahash_tfm *crypto_ahash_crt(struct crypto_ahash *tfm)
  55 {
  56         return &crypto_ahash_tfm(tfm)->crt_ahash;
  57 }
  58
  59 static inline unsigned int crypto_ahash_digestsize(struct crypto_ahash *tfm)
  60 {
  61         return crypto_ahash_crt(tfm)->digestsize;
  62 }
  63
  64 static inline u32 crypto_ahash_get_flags(struct crypto_ahash *tfm)
  65 {
  66         return crypto_tfm_get_flags(crypto_ahash_tfm(tfm));
  67 }
  68
  69 static inline void crypto_ahash_set_flags(struct crypto_ahash *tfm, u32 flags)
  70 {
  71         crypto_tfm_set_flags(crypto_ahash_tfm(tfm), flags);
  72 }
  73
  74 static inline void crypto_ahash_clear_flags(struct crypto_ahash *tfm, u32 flags)
  75 {
  76         crypto_tfm_clear_flags(crypto_ahash_tfm(tfm), flags);
  77 }
  78
  79 static inline struct crypto_ahash *crypto_ahash_reqtfm(
  80         struct ahash_request *req)
  81 {
  82         return __crypto_ahash_cast(req->base.tfm);
  83 }
  84
  85 static inline unsigned int crypto_ahash_reqsize(struct crypto_ahash *tfm)
  86 {
  87         return crypto_ahash_crt(tfm)->reqsize;
  88 }
  89
  90 static inline int crypto_ahash_setkey(struct crypto_ahash *tfm,
  91                                       const u8 *key, unsigned int keylen)
  92 {
  93         struct ahash_tfm *crt = crypto_ahash_crt(tfm);
  94
  95         return crt->setkey(tfm, key, keylen);
  96 }
  97
  98 static inline int crypto_ahash_digest(struct ahash_request *req)
  99 {
 100         struct ahash_tfm *crt = crypto_ahash_crt(crypto_ahash_reqtfm(req));
 101         return crt->digest(req);
 102 }
 103
 104 static inline void ahash_request_set_tfm(struct ahash_request *req,
 105                                          struct crypto_ahash *tfm)
 106 {
 107         req->base.tfm = crypto_ahash_tfm(tfm);
 108 }
 109
 110 static inline struct ahash_request *ahash_request_alloc(
 111         struct crypto_ahash *tfm, gfp_t gfp)
 112 {
 113         struct ahash_request *req;
 114
 115         req = kmalloc(sizeof(struct ahash_request) +
 116                       crypto_ahash_reqsize(tfm), gfp);
 117
 118         if (likely(req))
 119                 ahash_request_set_tfm(req, tfm);
 120
 121         return req;
 122 }
 123
 124 static inline void ahash_request_free(struct ahash_request *req)
 125 {
 126         kfree(req);
 127 }
 128
 129 static inline struct ahash_request *ahash_request_cast(
 130         struct crypto_async_request *req)
 131 {
 132         return container_of(req, struct ahash_request, base);
 133 }
 134
 135 static inline void ahash_request_set_callback(struct ahash_request *req,
 136                                               u32 flags,
 137                                               crypto_completion_t complete,
 138                                               void *data)
 139 {
 140         req->base.complete = complete;
 141         req->base.data = data;
 142         req->base.flags = flags;
 143 }
 144
 145 static inline void ahash_request_set_crypt(struct ahash_request *req,
 146                                            struct scatterlist *src, u8 *result,
 147                                            unsigned int nbytes)
 148 {
 149         req->src = src;
 150         req->nbytes = nbytes;
 151         req->result = result;
 152 }
 153
 154 #endif  /* _CRYPTO_HASH_H */