sys/crypto/libsodium/utils.c

   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
  26 sodium_memzero(void *b, size_t n)
  27 {
  28         explicit_bzero(b, n);
  29 }
  30
  31 int
  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 }