mirror of
https://github.com/TokTok/c-toxcore
synced 2026-06-04 08:11:45 +00:00
Maxim Biro
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*
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* ISC License
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*
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* Copyright (c) 2013-2016
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* Frank Denis <j at pureftpd dot org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "crypto_core.h"
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#ifndef VANILLA_NACL
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/* We use libsodium by default. */
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#include <sodium.h>
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#else
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#if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
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#include <windows.h>
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#include <wincrypt.h>
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#endif
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#endif
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void crypto_memzero(void *data, size_t length)
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{
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#ifndef VANILLA_NACL
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sodium_memzero(data, length);
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#else
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#ifdef _WIN32
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SecureZeroMemory(data, length);
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#elif defined(HAVE_MEMSET_S)
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if (length > 0U) {
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errno_t code = memset_s(data, (rsize_t) length, 0, (rsize_t) length);
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if (code != 0) {
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abort(); /* LCOV_EXCL_LINE */
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}
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}
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#elif defined(HAVE_EXPLICIT_BZERO)
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explicit_bzero(data, length);
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#else
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volatile unsigned char *volatile pnt =
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(volatile unsigned char *volatile) data;
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size_t i = (size_t) 0U;
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while (i < length) {
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pnt[i++] = 0U;
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}
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#endif
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#endif
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}
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int32_t crypto_memcmp(const void *p1, const void *p2, size_t length)
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{
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#ifndef VANILLA_NACL
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return sodium_memcmp(p1, p2, length);
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#else
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const volatile unsigned char *volatile b1 =
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(const volatile unsigned char *volatile) p1;
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const volatile unsigned char *volatile b2 =
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(const volatile unsigned char *volatile) p2;
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size_t i;
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unsigned char d = (unsigned char) 0U;
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for (i = 0U; i < length; i++) {
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d |= b1[i] ^ b2[i];
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}
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return (1 & ((d - 1) >> 8)) - 1;
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#endif
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}
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