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#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef VANILLA_NACL /* toxcore only uses this when libsodium is unavailable */
#ifndef __STDC_WANT_LIB_EXT1__
# define __STDC_WANT_LIB_EXT1__ 1
#endif
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
#include "utils.h"
#ifdef _WIN32
# include <windows.h>
# include <wincrypt.h>
#else
# include <unistd.h>
#endif
#ifdef HAVE_WEAK_SYMBOLS
__attribute__((weak)) void
__sodium_dummy_symbol_to_prevent_lto(void * const pnt, const size_t len)
{
(void) pnt;
(void) len;
}
#endif
void
sodium_memzero(void * const pnt, const size_t len)
{
#ifdef _WIN32
SecureZeroMemory(pnt, len);
#elif defined(HAVE_MEMSET_S)
if (memset_s(pnt, (rsize_t) len, 0, (rsize_t) len) != 0) {
abort();
}
#elif defined(HAVE_EXPLICIT_BZERO)
explicit_bzero(pnt, len);
#elif HAVE_WEAK_SYMBOLS
memset(pnt, 0, len);
__sodium_dummy_symbol_to_prevent_lto(pnt, len);
#else
volatile unsigned char *pnt_ = (volatile unsigned char *) pnt;
size_t i = (size_t) 0U;
while (i < len) {
pnt_[i++] = 0U;
}
#endif
}
int
sodium_memcmp(const void * const b1_, const void * const b2_, size_t len)
{
const unsigned char *b1 = (const unsigned char *) b1_;
const unsigned char *b2 = (const unsigned char *) b2_;
size_t i;
unsigned char d = (unsigned char) 0U;
for (i = 0U; i < len; i++) {
d |= b1[i] ^ b2[i];
}
return (int) ((1 & ((d - 1) >> 8)) - 1);
}
#endif
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