lib/rnd-libgcrypt.c

   1 /*
   2  * Copyright (C) 2008, 2010 Free Software Foundation, Inc.
   3  *
   4  * Author: Nikos Mavrogiannopoulos
   5  *
   6  * This file is part of GNUTLS.
   7  *
   8  * The GNUTLS library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation; either version 2.1 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  21  * USA
  22  *
  23  */
  24
  25 /* Here is the libgcrypt random generator layer.
  26  */
  27
  28 #include <gnutls_int.h>
  29 #include <gnutls_errors.h>
  30 #include <gnutls_num.h>
  31 #include <gnutls_mpi.h>
  32 #include <gcrypt.h>
  33
  34 static int
  35 wrap_gcry_rnd_init (void **ctx)
  36 {
  37   char c;
  38
  39   gcry_create_nonce (&c, 1);
  40   gcry_randomize (&c, 1, GCRY_STRONG_RANDOM);
  41
  42   return 0;
  43 }
  44
  45 static int
  46 wrap_gcry_rnd (void *ctx, int level, void *data, size_t datasize)
  47 {
  48   if (level == GNUTLS_RND_NONCE)
  49     gcry_create_nonce (data, datasize);
  50   else
  51     gcry_randomize (data, datasize, level);
  52
  53   return 0;
  54 }
  55
  56 int crypto_rnd_prio = INT_MAX;
  57
  58 gnutls_crypto_rnd_st _gnutls_rnd_ops = {
  59   .init = wrap_gcry_rnd_init,
  60   .deinit = NULL,
  61   .rnd = wrap_gcry_rnd,
  62 };