lib/random.c

   1 /*
   2  * Copyright (C) 2008-2012 Free Software Foundation, Inc.
   3  *
   4  * Author: Nikos Mavrogiannopoulos
   5  *
   6  * This file is part of GnuTLS.
   7  *
   8  * The GnuTLS 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 3 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 License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>
  20  *
  21  */
  22
  23 /* This file handles all the internal functions that cope with random data.
  24  */
  25
  26 #include <gnutls_int.h>
  27 #include <gnutls_errors.h>
  28 #include <random.h>
  29
  30 void *gnutls_rnd_ctx;
  31
  32 int
  33 _gnutls_rnd_init (void)
  34 {
  35   if (_gnutls_rnd_ops.init != NULL)
  36     {
  37       if (_gnutls_rnd_ops.init (&gnutls_rnd_ctx) < 0)
  38         {
  39           gnutls_assert ();
  40           return GNUTLS_E_RANDOM_FAILED;
  41         }
  42     }
  43
  44   return 0;
  45 }
  46
  47 void
  48 _gnutls_rnd_deinit (void)
  49 {
  50   if (_gnutls_rnd_ops.deinit != NULL)
  51     {
  52       _gnutls_rnd_ops.deinit (gnutls_rnd_ctx);
  53     }
  54
  55   return;
  56 }
  57
  58 /**
  59  * gnutls_rnd:
  60  * @level: a security level
  61  * @data: place to store random bytes
  62  * @len: The requested size
  63  *
  64  * This function will generate random data and store it to output
  65  * buffer.
  66  *
  67  * Returns: Zero or a negative error code on error.
  68  *
  69  * Since: 2.12.0
  70  **/
  71 int
  72 gnutls_rnd (gnutls_rnd_level_t level, void *data, size_t len)
  73 {
  74   return _gnutls_rnd(level, data, len);
  75 }