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/*
* ISC License
*
* Copyright (c) 2013-2016
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "crypto_core.h"
#ifndef VANILLA_NACL
/* We use libsodium by default. */
#include <sodium.h>
#else
#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
#include <windows.h>
#include <wincrypt.h>
#endif
#endif
void crypto_memzero(void *data, size_t length)
{
#ifndef VANILLA_NACL
sodium_memzero(data, length);
#else
#ifdef _WIN32
SecureZeroMemory(data, length);
#elif defined(HAVE_MEMSET_S)
if (length > 0U) {
errno_t code = memset_s(data, (rsize_t) length, 0, (rsize_t) length);
if (code != 0) {
abort(); /* LCOV_EXCL_LINE */
}
}
#elif defined(HAVE_EXPLICIT_BZERO)
explicit_bzero(data, length);
#else
volatile unsigned char *volatile pnt =
(volatile unsigned char *volatile) data;
size_t i = (size_t) 0U;
while (i < length) {
pnt[i++] = 0U;
}
#endif
#endif
}
int32_t crypto_memcmp(const void *p1, const void *p2, size_t length)
{
#ifndef VANILLA_NACL
return sodium_memcmp(p1, p2, length);
#else
const volatile unsigned char *volatile b1 =
(const volatile unsigned char *volatile) p1;
const volatile unsigned char *volatile b2 =
(const volatile unsigned char *volatile) p2;
size_t i;
unsigned char d = (unsigned char) 0U;
for (i = 0U; i < length; i++) {
d |= b1[i] ^ b2[i];
}
return (1 & ((d - 1) >> 8)) - 1;
#endif
}
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