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Tweak cprng_fast_buf to use 32-bit unaligned writes if possible.

This commit is contained in:
riastradh 2014-08-11 13:22:16 +00:00
parent 0c0361fcdd
commit 47d7f02ac0
1 changed files with 12 additions and 6 deletions
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18
sys/crypto/cprng_fast/cprng_fast.c
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@ -1,4 +1,4 @@
/* $NetBSD: cprng_fast.c,v 1.9 2014/08/11 13:12:53 riastradh Exp $ */
/* $NetBSD: cprng_fast.c,v 1.10 2014/08/11 13:22:16 riastradh Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cprng_fast.c,v 1.9 2014/08/11 13:12:53 riastradh Exp $");
__KERNEL_RCSID(0, "$NetBSD: cprng_fast.c,v 1.10 2014/08/11 13:22:16 riastradh Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -338,11 +338,17 @@ cprng_fast_buf(struct cprng_fast *cprng, void *buf, unsigned n)
{
uint8_t *p = buf;
uint32_t v;
unsigned r;
unsigned w, r;
while (n) {
r = MIN(n, 4);
n -= r;
w = n / sizeof(uint32_t);
while (w--) {
v = cprng_fast_word(cprng);
(void)memcpy(p, &v, 4);
p += 4;
}
r = n % sizeof(uint32_t);
if (r) {
v = cprng_fast_word(cprng);
while (r--) {
*p++ = (v & 0xff);