crypto/hash.c

   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 <linux/errno.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/seq_file.h>
  16
  17 #include "internal.h"
  18
  19 static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg)
  20 {
  21         return alg->cra_ctxsize;
  22 }
  23
  24 static int crypto_init_hash_ops(struct crypto_tfm *tfm)
  25 {
  26         struct hash_tfm *crt = &tfm->crt_hash;
  27         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
  28
  29         if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
  30                 return -EINVAL;
  31
  32         crt->init = alg->init;
  33         crt->update = alg->update;
  34         crt->final = alg->final;
  35         crt->digest = alg->digest;
  36         crt->setkey = alg->setkey;
  37         crt->digestsize = alg->digestsize;
  38
  39         return 0;
  40 }
  41
  42 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
  43         __attribute_used__;
  44 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
  45 {
  46         seq_printf(m, "type         : hash\n");
  47         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  48         seq_printf(m, "digestsize   : %u\n", alg->cra_hash.digestsize);
  49 }
  50
  51 const struct crypto_type crypto_hash_type = {
  52         .ctxsize = crypto_hash_ctxsize,
  53         .init = crypto_init_hash_ops,
  54 #ifdef CONFIG_PROC_FS
  55         .show = crypto_hash_show,
  56 #endif
  57 };
  58 EXPORT_SYMBOL_GPL(crypto_hash_type);
  59
  60 MODULE_LICENSE("GPL");
  61 MODULE_DESCRIPTION("Generic cryptographic hash type");