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/*
Authors:
Simo Sorce <ssorce@redhat.com>
Copyright (C) 2016 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "util/util.h"
#include "util/crypto/sss_crypto.h"
int generate_csprng_buffer(uint8_t *buf, size_t size)
{
ssize_t rsize;
ssize_t pos;
int ret;
int fd;
fd = open("/dev/urandom", O_RDONLY);
if (fd == -1) return errno;
rsize = 0;
pos = 0;
while (rsize < size) {
rsize = read(fd, buf + pos, size - pos);
switch (rsize) {
case -1:
if (errno == EINTR) continue;
ret = EIO;
goto done;
case 0:
ret = EIO;
goto done;
default:
if (rsize + pos < size - pos) {
pos += rsize;
continue;
}
ret = EIO;
goto done;
}
}
if (rsize != size) {
ret = EFAULT;
goto done;
}
ret = EOK;
done:
close(fd);
return ret;
}
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