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, u32 type,
  20                                         u32 mask)
  21 {
  22         return alg->cra_ctxsize;
  23 }
  24
  25 static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask)
  26 {
  27         struct hash_tfm *crt = &tfm->crt_hash;
  28         struct hash_alg *alg = &tfm->__crt_alg->cra_hash;
  29
  30         if (alg->digestsize > crypto_tfm_alg_blocksize(tfm))
  31                 return -EINVAL;
  32
  33         crt->init = alg->init;
  34         crt->update = alg->update;
  35         crt->final = alg->final;
  36         crt->digest = alg->digest;
  37         crt->setkey = alg->setkey;
  38         crt->digestsize = alg->digestsize;
  39
  40         return 0;
  41 }
  42
  43 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
  44         __attribute__ ((unused));
  45 static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg)
  46 {
  47         seq_printf(m, "type         : hash\n");
  48         seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
  49         seq_printf(m, "digestsize   : %u\n", alg->cra_hash.digestsize);
  50 }
  51
  52 const struct crypto_type crypto_hash_type = {
  53         .ctxsize = crypto_hash_ctxsize,
  54         .init = crypto_init_hash_ops,
  55 #ifdef CONFIG_PROC_FS
  56         .show = crypto_hash_show,
  57 #endif
  58 };
  59 EXPORT_SYMBOL_GPL(crypto_hash_type);
  60
  61 MODULE_LICENSE("GPL");
  62 MODULE_DESCRIPTION("Generic cryptographic hash type");