Line data    Source code

       1             : /* FreeTDS - Library of routines accessing Sybase and Microsoft databases
       2             :  * Copyright (C) 1998-1999  Brian Bruns
       3             :  * Copyright (C) 2005-2015  Frediano Ziglio
       4             :  *
       5             :  * This library is free software; you can redistribute it and/or
       6             :  * modify it under the terms of the GNU Library General Public
       7             :  * License as published by the Free Software Foundation; either
       8             :  * version 2 of the License, or (at your option) any later version.
       9             :  *
      10             :  * This library is distributed in the hope that it will be useful,
      11             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      12             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13             :  * Library General Public License for more details.
      14             :  *
      15             :  * You should have received a copy of the GNU Library General Public
      16             :  * License along with this library; if not, write to the
      17             :  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
      18             :  * Boston, MA 02111-1307, USA.
      19             :  */
      20             : 
      21             : #include <config.h>
      22             : 
      23             : #if HAVE_STDLIB_H
      24             : #include <stdlib.h>
      25             : #endif /* HAVE_STDLIB_H */
      26             : 
      27             : #include <freetds/tds.h>
      28             : 
      29             : #ifdef HAVE_GNUTLS
      30             : #include <gnutls/gnutls.h>
      31             : #include <gnutls/crypto.h>
      32             : #ifndef HAVE_GNUTLS_RND
      33             : #include <gcrypt.h>
      34             : #endif
      35             : #elif defined(HAVE_OPENSSL)
      36             : #include <openssl/rand.h>
      37             : #endif
      38             : 
      39             : void
      40         716 : tds_random_buffer(unsigned char *out, int len)
      41             : {
      42             :         int i;
      43             : 
      44             : #if defined(HAVE_GNUTLS) && defined(HAVE_GNUTLS_RND)
      45         358 :         if (gnutls_rnd(GNUTLS_RND_RANDOM, out, len) >= 0)
      46             :                 return;
      47           0 :         if (gnutls_rnd(GNUTLS_RND_NONCE, out, len) >= 0)
      48             :                 return;
      49             : #elif defined(HAVE_GNUTLS)
      50             :         void *p = gcry_random_bytes(len, GCRY_STRONG_RANDOM);
      51             :         if (p) {
      52             :                 memcpy(out, p, len);
      53             :                 free(p);
      54             :                 return;
      55             :         }
      56             : #elif defined(HAVE_OPENSSL)
      57         358 :         if (RAND_bytes(out, len) == 1)
      58             :                 return;
      59             : #endif
      60             : 
      61             :         /* TODO find a better random... */
      62           0 :         for (i = 0; i < len; ++i)
      63           0 :                 out[i] = rand() / (RAND_MAX / 256);
      64             : }