FreeBSD/Linux Kernel Cross Reference
sys/crypto/libsodium/utils.c

     /*
      * ISC License
      *
      * Copyright (c) 2013-2018
      * Frank Denis <j at pureftpd dot org>
      *
      * Permission to use, copy, modify, and/or distribute this software for any
      * purpose with or without fee is hereby granted, provided that the above
      * copyright notice and this permission notice appear in all copies.
     *
     * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    #include <sys/types.h>
    #include <sys/systm.h>
    
    #include <sodium/utils.h>
    
    void
    sodium_memzero(void *b, size_t n)
    {
            explicit_bzero(b, n);
    }
    
    int
    sodium_is_zero(const unsigned char *n, const size_t nlen)
    {
        size_t                 i;
        volatile unsigned char d = 0U;
    
        for (i = 0U; i < nlen; i++) {
            d |= n[i];
        }
        return 1 & ((d - 1) >> 8);
    }

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