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/cdefs.h> 21 __FBSDID("$FreeBSD$"); 22 #include <sys/types.h> 23 #include <sys/systm.h> 24 25 #include <sodium/utils.h> 26 27 void 28 sodium_memzero(void *b, size_t n) 29 { 30 explicit_bzero(b, n); 31 } 32 33 int 34 sodium_is_zero(const unsigned char *n, const size_t nlen) 35 { 36 size_t i; 37 volatile unsigned char d = 0U; 38 39 for (i = 0U; i < nlen; i++) { 40 d |= n[i]; 41 } 42 return 1 & ((d - 1) >> 8); 43 } 44