2 * QEMU Crypto random number provider
4 * Copyright (c) 2015-2016 Red Hat, Inc.
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.
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.
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/>.
21 #include "qemu/osdep.h"
23 #include "crypto/random.h"
25 int qcrypto_random_bytes(uint8_t *buf G_GNUC_UNUSED
,
26 size_t buflen G_GNUC_UNUSED
,
33 /* TBD perhaps also add support for BSD getentropy / Linux
34 * getrandom syscalls directly */
35 fd
= open("/dev/urandom", O_RDONLY
);
36 if (fd
== -1 && errno
== ENOENT
) {
37 fd
= open("/dev/random", O_RDONLY
);
41 error_setg(errp
, "No /dev/urandom or /dev/random found");
46 got
= read(fd
, buf
, buflen
);
48 error_setg_errno(errp
, errno
,
49 "Unable to read random bytes");
53 "Unexpected EOF reading random bytes");