hash.c

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    1 /*
    2  * Cryptographic Hash operations.
    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 #include <crypto/internal/hash.h>
   13 #include <linux/errno.h>
   14 #include <linux/kernel.h>
   15 #include <linux/module.h>
   16 #include <linux/slab.h>
   17 #include <linux/seq_file.h>
   18 
   19 #include "internal.h"
   20 
   21 static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type,
   22                                         u32 mask)
   23 {
   24         return alg->cra_ctxsize;
   25 }
   26 
   27 static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key,
   28                                  unsigned int keylen)
   29 {
   30         struct crypto_tfm *tfm = crypto_hash_tfm(crt);
   31         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
   32         unsigned long alignmask = crypto_hash_alignmask(crt);
   33         int ret;
   34         u8 *buffer, *alignbuffer;
   35         unsigned long absize;
   36 
   37         absize = keylen + alignmask;
   38         buffer = kmalloc(absize, GFP_ATOMIC);
   39         if (!buffer)
   40                 return -ENOMEM;
   41 
   42         alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
   43         memcpy(alignbuffer, key, keylen);
   44         ret = alg->setkey(crt, alignbuffer, keylen);
   45         memset(alignbuffer, 0, keylen);
   46         kfree(buffer);
   47         return ret;
   48 }
   49 
   50 static int hash_setkey(struct crypto_hash *crt, const u8 *key,
   51                        unsigned int keylen)
   52 {
   53         struct crypto_tfm *tfm = crypto_hash_tfm(crt);
   54         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
   55         unsigned long alignmask = crypto_hash_alignmask(crt);
   56 
   57         if ((unsigned long)key & alignmask)
   58                 return hash_setkey_unaligned(crt, key, keylen);
   59 
   60         return alg->setkey(crt, key, keylen);
   61 }
   62 
   63 static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key,
   64                         unsigned int keylen)
   65 {
   66         struct crypto_tfm  *tfm      = crypto_ahash_tfm(tfm_async);
   67         struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm);
   68         struct hash_alg    *alg      = &tfm->__crt_alg->cra_hash;
   69 
   70         return alg->setkey(tfm_hash, key, keylen);
   71 }
   72 
   73 static int hash_async_init(struct ahash_request *req)
   74 {
   75         struct crypto_tfm *tfm = req->base.tfm;
   76         struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
   77         struct hash_desc  desc = {
   78                 .tfm = __crypto_hash_cast(tfm),
   79                 .flags = req->base.flags,
   80         };
   81 
   82         return alg->init(&desc);
   83 }
   84 
   85 static int hash_async_update(struct ahash_request *req)
   86 {
   87         struct crypto_tfm *tfm = req->base.tfm;
   88         struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
   89         struct hash_desc  desc = {
   90                 .tfm = __crypto_hash_cast(tfm),
   91                 .flags = req->base.flags,
   92         };
   93 
   94         return alg->update(&desc, req->src, req->nbytes);
   95 }
   96 
   97 static int hash_async_final(struct ahash_request *req)
   98 {
   99         struct crypto_tfm *tfm = req->base.tfm;
  100         struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
  101         struct hash_desc  desc = {
  102                 .tfm = __crypto_hash_cast(tfm),
  103                 .flags = req->base.flags,
  104         };
  105 
  106         return alg->final(&desc, req->result);
  107 }
  108 
  109 static int hash_async_digest(struct ahash_request *req)
  110 {
  111         struct crypto_tfm *tfm = req->base.tfm;
  112         struct hash_alg   *alg = &tfm->__crt_alg->cra_hash;
  113         struct hash_desc  desc = {
  114                 .tfm = __crypto_hash_cast(tfm),
  115                 .flags = req->base.flags,
  116         };
  117 
  118         return alg->digest(&desc, req->src, req->nbytes, req->result);
  119 }
  120 
  121 static int crypto_init_hash_ops_async(struct crypto_tfm *tfm)
  122 {
  123         struct ahash_tfm *crt = &tfm->crt_ahash;
  124         struct hash_alg  *alg = &tfm->__crt_alg->cra_hash;
  125 
  126         crt->init       = hash_async_init;
  127         crt->update     = hash_async_update;
  128         crt->final      = hash_async_final;
  129         crt->digest     = hash_async_digest;
  130         crt->setkey     = hash_async_setkey;
  131         crt->digestsize = alg->digestsize;
  132 
  133         return 0;
  134 }
  135 
  136 static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm)
  137 {
  138         struct hash_tfm *crt = &tfm->crt_hash;
  139         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
  140 
  141         crt->init       = alg->init;
  142         crt->update     = alg->update;
  143         crt->final      = alg->final;
  144         crt->digest     = alg->digest;
  145         crt->setkey     = hash_setkey;
  146         crt->digestsize = alg->digestsize;
  147 
  148         return 0;
  149 }
  150 
  151 static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
  152 {
  153         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
  154 
  155         if (alg->digestsize > PAGE_SIZE / 8)
  156                 return -EINVAL;
  157 
  158         if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK)
  159                 return crypto_init_hash_ops_async(tfm);
  160         else
  161                 return crypto_init_hash_ops_sync(tfm);
  162 }
  163 
  164 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
  165         __attribute__ ((unused));
  166 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
  167 {
  168         seq_printf(m, "type         : hash\n");
  169         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  170         seq_printf(m, "digestsize   : %u\n", alg->cra_hash.digestsize);
  171 }
  172 
  173 const struct crypto_type crypto_hash_type = {
  174         .ctxsize = crypto_hash_ctxsize,
  175         .init = crypto_init_hash_ops,
  176 #ifdef CONFIG_PROC_FS
  177         .show = crypto_hash_show,
  178 #endif
  179 };
  180 EXPORT_SYMBOL_GPL(crypto_hash_type);
  181 
  182 MODULE_LICENSE("GPL");
  183 MODULE_DESCRIPTION("Generic cryptographic hash type");

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FreeBSD/Linux Kernel Cross Reference sys/crypto/hash.c

FreeBSD/Linux Kernel Cross Reference
sys/crypto/hash.c