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/* $MirOS: contrib/hosted/fwcf/sys_bsd.c,v 1.4 2007/03/13 18:14:30 tg Exp $ */
/*-
* Copyright (c) 2006, 2007
* Thorsten Glaser <tg@mirbsd.de>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include "defs.h"
#include "sysdeps.h"
__RCSID("$MirOS: contrib/hosted/fwcf/sys_bsd.c,v 1.4 2007/03/13 18:14:30 tg Exp $");
void
pull_rndata(uint8_t *buf, size_t n)
{
#ifdef RND_DISABLE
while (n--)
*buf++ = 0xF6;
*--buf = 0xFF;
#else
#ifdef RND_DEBUG
fprintf(stderr, "writing %ld bytes of entropy\n", n);
while (n > 4) {
#else
while (n >= 4) {
#endif
*(uint32_t *)buf = arc4random();
#ifdef RND_DEBUG
*buf = 0xF6;
#endif
buf += 4;
n -= 4;
}
while (n) {
#ifdef RND_DEBUG
*buf++ = 0xF6;
#else
*buf++ = arc4random() & 0xFF;
#endif
n--;
}
#ifdef RND_DEBUG
*--buf = 0xFF;
#endif
#endif
}
void
push_rndata(uint8_t *buf, size_t n)
{
#ifdef RND_DEBUG
size_t i;
#endif
#ifdef __MirBSD__
arc4random_pushb(buf, n);
#else
int fd;
uint32_t x;
arc4random_addrandom(buf, n);
x = arc4random();
if ((fd = open("/dev/arandom", O_WRONLY)) >= 0) {
write(fd, &x, 4);
close(fd);
} else
warn("cannot write to /dev/arandom");
#endif
#ifdef RND_DEBUG
printf("reading %ld bytes of entropy\n", n);
for (i = 0; i < n; ++i) {
printf(" %02X", buf[i]);
if ((i & 0xF) == 0xF)
putchar('\n');
}
putchar('\n');
#endif
}
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