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