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#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#ifdef _WIN32
# include <windows.h>
#elif defined(HAVE_PTHREAD)
# include <pthread.h>
#endif
#include "core.h"
#include "crypto_generichash.h"
#include "crypto_onetimeauth.h"
#include "crypto_scalarmult.h"
#include "crypto_stream_chacha20.h"
#include "crypto_stream_salsa20.h"
#include "randombytes.h"
#include "runtime.h"
#include "utils.h"
#include "private/implementations.h"
#include "private/mutex.h"
#if !defined(_MSC_VER) && 0
# warning *** This is unstable, untested, development code.
# warning It might not compile. It might not work as expected.
# warning It might be totally insecure.
# warning Do not use this in production.
# warning Use releases available at https://download.libsodium.org/libsodium/releases/ instead.
# warning Alternatively, use the "stable" branch in the git repository.
#endif
#if !defined(_MSC_VER) && (!defined(CONFIGURED) || CONFIGURED != 1)
# warning *** The library is being compiled using an undocumented method.
# warning This is not supported. It has not been tested, it might not
# warning work as expected, and performance is likely to be suboptimal.
#endif
static volatile int initialized;
static volatile int locked;
int
sodium_init(void)
{
if (sodium_crit_enter() != 0) {
return -1; /* LCOV_EXCL_LINE */
}
if (initialized != 0) {
if (sodium_crit_leave() != 0) {
return -1; /* LCOV_EXCL_LINE */
}
return 1;
}
_sodium_runtime_get_cpu_features();
randombytes_stir();
_sodium_alloc_init();
_crypto_pwhash_argon2_pick_best_implementation();
_crypto_generichash_blake2b_pick_best_implementation();
_crypto_onetimeauth_poly1305_pick_best_implementation();
_crypto_scalarmult_curve25519_pick_best_implementation();
_crypto_stream_chacha20_pick_best_implementation();
_crypto_stream_salsa20_pick_best_implementation();
initialized = 1;
if (sodium_crit_leave() != 0) {
return -1; /* LCOV_EXCL_LINE */
}
return 0;
}
#ifdef _WIN32
static CRITICAL_SECTION _sodium_lock;
static volatile LONG _sodium_lock_initialized;
int
_sodium_crit_init(void)
{
LONG status = 0L;
while ((status = InterlockedCompareExchange(&_sodium_lock_initialized,
1L, 0L)) == 1L) {
Sleep(0);
}
switch (status) {
case 0L:
InitializeCriticalSection(&_sodium_lock);
return InterlockedExchange(&_sodium_lock_initialized, 2L) == 1L ? 0 : -1;
case 2L:
return 0;
default: /* should never be reached */
return -1;
}
}
int
sodium_crit_enter(void)
{
if (_sodium_crit_init() != 0) {
return -1; /* LCOV_EXCL_LINE */
}
EnterCriticalSection(&_sodium_lock);
assert(locked == 0);
locked = 1;
return 0;
}
int
sodium_crit_leave(void)
{
if (locked == 0) {
# ifdef EPERM
errno = EPERM;
# endif
return -1;
}
locked = 0;
LeaveCriticalSection(&_sodium_lock);
return 0;
}
#elif defined(HAVE_PTHREAD) && !defined(__EMSCRIPTEN__)
static pthread_mutex_t _sodium_lock = PTHREAD_MUTEX_INITIALIZER;
int
sodium_crit_enter(void)
{
int ret;
if ((ret = pthread_mutex_lock(&_sodium_lock)) == 0) {
assert(locked == 0);
locked = 1;
}
return ret;
}
int
sodium_crit_leave(void)
{
int ret;
if (locked == 0) {
# ifdef EPERM
errno = EPERM;
# endif
return -1;
}
locked = 0;
return pthread_mutex_unlock(&_sodium_lock);
}
#elif defined(HAVE_ATOMIC_OPS) && !defined(__EMSCRIPTEN__) && !defined(__native_client__)
static volatile int _sodium_lock;
int
sodium_crit_enter(void)
{
# ifdef HAVE_NANOSLEEP
struct timespec q;
memset(&q, 0, sizeof q);
# endif
while (__sync_lock_test_and_set(&_sodium_lock, 1) != 0) {
# ifdef HAVE_NANOSLEEP
(void) nanosleep(&q, NULL);
# elif defined(__x86_64__) || defined(__i386__)
__asm__ __volatile__ ("pause");
# endif
}
return 0;
}
int
sodium_crit_leave(void)
{
__sync_lock_release(&_sodium_lock);
return 0;
}
#else
int
sodium_crit_enter(void)
{
return 0;
}
int
sodium_crit_leave(void)
{
return 0;
}
#endif
static void (*_misuse_handler)(void);
void
sodium_misuse(void)
{
void (*handler)(void);
(void) sodium_crit_leave();
if (sodium_crit_enter() == 0) {
handler = _misuse_handler;
if (handler != NULL) {
handler();
}
}
/* LCOV_EXCL_START */
abort();
}
/* LCOV_EXCL_STOP */
int
sodium_set_misuse_handler(void (*handler)(void))
{
if (sodium_crit_enter() != 0) {
return -1; /* LCOV_EXCL_LINE */
}
_misuse_handler = handler;
if (sodium_crit_leave() != 0) {
return -1; /* LCOV_EXCL_LINE */
}
return 0;
}
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