1 /*
2 * ISC License
3 *
4 * Copyright (c) 2013-2018
5 * Frank Denis <j at pureftpd dot org>
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 #include <sys/types.h>
21 #include <sys/systm.h>
22
23 #include <sodium/utils.h>
24
25 void
sodium_memzero(void * b,size_t n)26 sodium_memzero(void *b, size_t n)
27 {
28 explicit_bzero(b, n);
29 }
30
31 int
sodium_is_zero(const unsigned char * n,const size_t nlen)32 sodium_is_zero(const unsigned char *n, const size_t nlen)
33 {
34 size_t i;
35 volatile unsigned char d = 0U;
36
37 for (i = 0U; i < nlen; i++) {
38 d |= n[i];
39 }
40 return 1 & ((d - 1) >> 8);
41 }
42