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62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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/* $Id$ */
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/***
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This file is part of polypaudio.
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polypaudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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polypaudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with polypaudio; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <time.h>
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#include "random.h"
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#include "util.h"
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#include "log.h"
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#define RANDOM_DEVICE "/dev/urandom"
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void pa_random(void *ret_data, size_t length) {
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int fd;
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ssize_t r = 0;
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assert(ret_data && length);
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if ((fd = open(RANDOM_DEVICE, O_RDONLY)) >= 0) {
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if ((r = pa_loop_read(fd, ret_data, length)) < 0 || (size_t) r != length)
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pa_log_error(__FILE__": failed to read entropy from '%s'\n", RANDOM_DEVICE);
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close(fd);
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}
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if ((size_t) r != length) {
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uint8_t *p;
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size_t l;
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pa_log_warn(__FILE__": WARNING: Failed to open entropy device '"RANDOM_DEVICE"': %s"
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", falling back to unsecure pseudo RNG.\n", strerror(errno));
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srandom(time(NULL));
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for (p = ret_data, l = length; l > 0; p++, l--)
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*p = (uint8_t) random();
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}
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}
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