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#ifndef __STDC_WANT_LIB_EXT1__
# define __STDC_WANT_LIB_EXT1__ 1
#endif
#include <errno.h>
#include <limits.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"
#include "randombytes.h"
#ifdef _WIN32
# include <windows.h>
# include <wincrypt.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 HAVE_SECUREZEROMEMORY
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);
}
unsigned char *
_sodium_alignedcalloc(unsigned char ** const unaligned_p, const size_t len)
{
unsigned char *aligned;
unsigned char *unaligned;
size_t i;
if (SIZE_MAX - (size_t) 256U < len ||
(unaligned = (unsigned char *) malloc(len + (size_t) 256U)) == NULL) {
*unaligned_p = NULL;
return NULL;
}
*unaligned_p = unaligned;
#ifdef HAVE_ARC4RANDOM_BUF
(void) i;
arc4random_buf(unaligned, len + (size_t) 256U);
#else
for (i = (size_t) 0U; i < len + (size_t) 256U; ++i) {
unaligned[i] = (unsigned char) rand();
}
#endif
aligned = unaligned + 64;
aligned += (ptrdiff_t) 63 & (-(ptrdiff_t) aligned);
memset(aligned, 0, len);
return aligned;
}
char *
sodium_bin2hex(char * const hex, const size_t hex_maxlen,
const unsigned char * const bin, const size_t bin_len)
{
static const char hexdigits[16] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
size_t i = (size_t) 0U;
size_t j = (size_t) 0U;
if (bin_len >= SIZE_MAX / 2 || hex_maxlen < bin_len * 2U) {
abort();
}
while (i < bin_len) {
hex[j++] = hexdigits[bin[i] >> 4];
hex[j++] = hexdigits[bin[i] & 0xf];
i++;
}
hex[j] = 0;
return hex;
}
int
sodium_hex2bin(unsigned char * const bin, const size_t bin_maxlen,
const char * const hex, const size_t hex_len,
const char * const ignore, size_t * const bin_len,
const char ** const hex_end)
{
size_t bin_pos = (size_t) 0U;
size_t hex_pos = (size_t) 0U;
int ret = 0;
unsigned char c;
unsigned char c_acc = 0U;
unsigned char c_num;
unsigned char c_val;
unsigned char state = 0U;
while (hex_pos < hex_len) {
c = (unsigned char) hex[hex_pos];
if ((c_num = c ^ 48U) < 10U) {
c_val = c_num;
} else if ((c_num = (c & ~32U)) > 64 && c_num < 71U) {
c_val = c_num - 55U;
} else if (ignore != NULL && strchr(ignore, c) != NULL && state == 0U) {
hex_pos++;
continue;
} else {
break;
}
if (bin_pos >= bin_maxlen) {
ret = -1;
errno = ERANGE;
break;
}
if (state == 0U) {
c_acc = c_val * 16U;
} else {
bin[bin_pos++] = c_acc | c_val;
}
state = ~state;
hex_pos++;
}
if (state != 0U) {
hex_pos--;
}
if (hex_end != NULL) {
*hex_end = &hex[hex_pos];
}
if (bin_len != NULL) {
*bin_len = bin_pos;
}
return ret;
}
int
sodium_mlock(void * const addr, const size_t len)
{
#ifdef MADV_DONTDUMP
(void) madvise(addr, len, MADV_DONTDUMP);
#endif
#ifdef HAVE_MLOCK
return mlock(addr, len);
#elif defined(HAVE_VIRTUALLOCK)
return -(VirtualLock(addr, len) == 0);
#else
errno = ENOSYS;
return -1;
#endif
}
int
sodium_munlock(void * const addr, const size_t len)
{
sodium_memzero(addr, len);
#ifdef MADV_DODUMP
(void) madvise(addr, len, MADV_DODUMP);
#endif
#ifdef HAVE_MLOCK
return munlock(addr, len);
#elif defined(HAVE_VIRTUALLOCK)
return -(VirtualUnlock(addr, len) == 0);
#else
errno = ENOSYS;
return -1;
#endif
}
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