mirror of
https://github.com/qemu/qemu.git
synced 2024-11-30 07:13:38 +08:00
a37278169d
If no crypto library is included in the build, QEMU uses qcrypto_random_bytes() to generate random data. That function tried to open /dev/urandom or /dev/random and if opening both files failed it errored out. Those files obviously do not exist on windows, so there the code uses CryptGenRandom(). Furthermore there was some refactoring and a new function qcrypto_random_init() was introduced. If a proper crypto library (gnutls or libgcrypt) is included in the build, this function does nothing. If neither is included it initializes the (platform specific) handles that are used by qcrypto_random_bytes(). Either: * a handle to /dev/urandom | /dev/random on unix like systems * a handle to a cryptographic service provider on windows Signed-off-by: Geert Martin Ijewski <gm.ijewski@web.de> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
|
|
* QEMU Crypto random number provider
|
|
*
|
|
* Copyright (c) 2015-2016 Red Hat, Inc.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
|
|
#include "crypto/random.h"
|
|
|
|
#include <gnutls/gnutls.h>
|
|
#include <gnutls/crypto.h>
|
|
|
|
int qcrypto_random_bytes(uint8_t *buf,
|
|
size_t buflen,
|
|
Error **errp)
|
|
{
|
|
int ret;
|
|
|
|
ret = gnutls_rnd(GNUTLS_RND_RANDOM, buf, buflen);
|
|
|
|
if (ret < 0) {
|
|
error_setg(errp, "Cannot get random bytes: %s",
|
|
gnutls_strerror(ret));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int qcrypto_random_init(Error **errp G_GNUC_UNUSED) { return 0; }
|