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mix in another counter when called if not yet satisfied

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This commit is contained in:
dan 2002-10-07 11:02:20 +00:00
parent e6fe57e960
commit b03866d6f0
1 changed files with 10 additions and 3 deletions
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13
sys/dev/rnd.c
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@ -1,4 +1,4 @@
/* $NetBSD: rnd.c,v 1.31 2002/10/07 09:41:51 dan Exp $ */
/* $NetBSD: rnd.c,v 1.32 2002/10/07 11:02:20 dan Exp $ */
/*-
* Copyright (c) 1997 The NetBSD Foundation, Inc.
@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rnd.c,v 1.31 2002/10/07 09:41:51 dan Exp $");
__KERNEL_RCSID(0, "$NetBSD: rnd.c,v 1.32 2002/10/07 11:02:20 dan Exp $");
#include <sys/param.h>
#include <sys/ioctl.h>
@ -1000,14 +1000,21 @@ int
rnd_extract_data(void *p, u_int32_t len, u_int32_t flags)
{
int retval, s;
u_int32_t c;
if (!rnd_have_entropy) {
/* Try once again to put something in the pool */
c = rnd_counter();
#ifdef RND_VERBOSE
if (!rnd_have_entropy)
printf("rnd: WARNING! initial entropy low (%u).\n",
rndpool_get_entropy_count(&rnd_pool));
#endif
}
s = splsoftclock();
if (!rnd_have_entropy) {
rndpool_add_data(&rnd_pool, &c, sizeof(u_int32_t), 0);
}
retval = rndpool_extract_data(&rnd_pool, p, len, flags);
splx(s);