crypto/random-gnutls.c

   1 /*
   2  * QEMU Crypto random number provider
   3  *
   4  * Copyright (c) 2015-2016 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22
  23 #include "crypto/random.h"
  24
  25 #include <gnutls/gnutls.h>
  26 #include <gnutls/crypto.h>
  27
  28 int qcrypto_random_bytes(uint8_t *buf,
  29                          size_t buflen,
  30                          Error **errp)
  31 {
  32     int ret;
  33
  34     ret = gnutls_rnd(GNUTLS_RND_RANDOM, buf, buflen);
  35
  36     if (ret < 0) {
  37         error_setg(errp, "Cannot get random bytes: %s",
  38                    gnutls_strerror(ret));
  39         return -1;
  40     }
  41
  42     return 0;
  43 }