mirror of
https://github.com/xmrig/xmrig.git
synced 2024-12-23 03:59:41 +00:00
277 lines
6.7 KiB
C
277 lines
6.7 KiB
C
/* Generate sizeof(uint32_t) bytes of as random data as possible to seed
|
|
the hash function.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <jansson_private_config.h>
|
|
#endif
|
|
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
|
|
#ifdef HAVE_STDINT_H
|
|
#include <stdint.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_FCNTL_H
|
|
#include <fcntl.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_SCHED_H
|
|
#include <sched.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_STAT_H
|
|
#include <sys/stat.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_TIME_H
|
|
#include <sys/time.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
#include <sys/types.h>
|
|
#endif
|
|
|
|
#if defined(_WIN32)
|
|
/* For GetModuleHandle(), GetProcAddress() and GetCurrentProcessId() */
|
|
#include <windows.h>
|
|
#endif
|
|
|
|
#include "jansson.h"
|
|
|
|
|
|
static uint32_t buf_to_uint32(char *data) {
|
|
size_t i;
|
|
uint32_t result = 0;
|
|
|
|
for (i = 0; i < sizeof(uint32_t); i++)
|
|
result = (result << 8) | (unsigned char)data[i];
|
|
|
|
return result;
|
|
}
|
|
|
|
|
|
|
|
/* /dev/urandom */
|
|
#if !defined(_WIN32) && defined(USE_URANDOM)
|
|
static int seed_from_urandom(uint32_t *seed) {
|
|
/* Use unbuffered I/O if we have open(), close() and read(). Otherwise
|
|
fall back to fopen() */
|
|
|
|
char data[sizeof(uint32_t)];
|
|
int ok;
|
|
|
|
#if defined(HAVE_OPEN) && defined(HAVE_CLOSE) && defined(HAVE_READ)
|
|
int urandom;
|
|
urandom = open("/dev/urandom", O_RDONLY);
|
|
if (urandom == -1)
|
|
return 1;
|
|
|
|
ok = read(urandom, data, sizeof(uint32_t)) == sizeof(uint32_t);
|
|
close(urandom);
|
|
#else
|
|
FILE *urandom;
|
|
|
|
urandom = fopen("/dev/urandom", "rb");
|
|
if (!urandom)
|
|
return 1;
|
|
|
|
ok = fread(data, 1, sizeof(uint32_t), urandom) == sizeof(uint32_t);
|
|
fclose(urandom);
|
|
#endif
|
|
|
|
if (!ok)
|
|
return 1;
|
|
|
|
*seed = buf_to_uint32(data);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Windows Crypto API */
|
|
#if defined(_WIN32) && defined(USE_WINDOWS_CRYPTOAPI)
|
|
#include <wincrypt.h>
|
|
|
|
typedef BOOL (WINAPI *CRYPTACQUIRECONTEXTA)(HCRYPTPROV *phProv, LPCSTR pszContainer, LPCSTR pszProvider, DWORD dwProvType, DWORD dwFlags);
|
|
typedef BOOL (WINAPI *CRYPTGENRANDOM)(HCRYPTPROV hProv, DWORD dwLen, BYTE *pbBuffer);
|
|
typedef BOOL (WINAPI *CRYPTRELEASECONTEXT)(HCRYPTPROV hProv, DWORD dwFlags);
|
|
|
|
static int seed_from_windows_cryptoapi(uint32_t *seed)
|
|
{
|
|
HINSTANCE hAdvAPI32 = NULL;
|
|
CRYPTACQUIRECONTEXTA pCryptAcquireContext = NULL;
|
|
CRYPTGENRANDOM pCryptGenRandom = NULL;
|
|
CRYPTRELEASECONTEXT pCryptReleaseContext = NULL;
|
|
HCRYPTPROV hCryptProv = 0;
|
|
BYTE data[sizeof(uint32_t)];
|
|
int ok;
|
|
|
|
hAdvAPI32 = GetModuleHandle(TEXT("advapi32.dll"));
|
|
if(hAdvAPI32 == NULL)
|
|
return 1;
|
|
|
|
pCryptAcquireContext = (CRYPTACQUIRECONTEXTA)GetProcAddress(hAdvAPI32, "CryptAcquireContextA");
|
|
if (!pCryptAcquireContext)
|
|
return 1;
|
|
|
|
pCryptGenRandom = (CRYPTGENRANDOM)GetProcAddress(hAdvAPI32, "CryptGenRandom");
|
|
if (!pCryptGenRandom)
|
|
return 1;
|
|
|
|
pCryptReleaseContext = (CRYPTRELEASECONTEXT)GetProcAddress(hAdvAPI32, "CryptReleaseContext");
|
|
if (!pCryptReleaseContext)
|
|
return 1;
|
|
|
|
if (!pCryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
|
|
return 1;
|
|
|
|
ok = pCryptGenRandom(hCryptProv, sizeof(uint32_t), data);
|
|
pCryptReleaseContext(hCryptProv, 0);
|
|
|
|
if (!ok)
|
|
return 1;
|
|
|
|
*seed = buf_to_uint32((char *)data);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* gettimeofday() and getpid() */
|
|
static int seed_from_timestamp_and_pid(uint32_t *seed) {
|
|
#ifdef HAVE_GETTIMEOFDAY
|
|
/* XOR of seconds and microseconds */
|
|
struct timeval tv;
|
|
gettimeofday(&tv, NULL);
|
|
*seed = (uint32_t)tv.tv_sec ^ (uint32_t)tv.tv_usec;
|
|
#else
|
|
/* Seconds only */
|
|
*seed = (uint32_t)time(NULL);
|
|
#endif
|
|
|
|
/* XOR with PID for more randomness */
|
|
#if defined(_WIN32)
|
|
*seed ^= (uint32_t)GetCurrentProcessId();
|
|
#elif defined(HAVE_GETPID)
|
|
*seed ^= (uint32_t)getpid();
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static uint32_t generate_seed() {
|
|
uint32_t seed;
|
|
int done = 0;
|
|
|
|
#if !defined(_WIN32) && defined(USE_URANDOM)
|
|
if (!done && seed_from_urandom(&seed) == 0)
|
|
done = 1;
|
|
#endif
|
|
|
|
#if defined(_WIN32) && defined(USE_WINDOWS_CRYPTOAPI)
|
|
if (!done && seed_from_windows_cryptoapi(&seed) == 0)
|
|
done = 1;
|
|
#endif
|
|
|
|
if (!done) {
|
|
/* Fall back to timestamp and PID if no better randomness is
|
|
available */
|
|
seed_from_timestamp_and_pid(&seed);
|
|
}
|
|
|
|
/* Make sure the seed is never zero */
|
|
if (seed == 0)
|
|
seed = 1;
|
|
|
|
return seed;
|
|
}
|
|
|
|
|
|
volatile uint32_t hashtable_seed = 0;
|
|
|
|
#if defined(HAVE_ATOMIC_BUILTINS) && (defined(HAVE_SCHED_YIELD) || !defined(_WIN32))
|
|
static volatile char seed_initialized = 0;
|
|
|
|
void json_object_seed(size_t seed) {
|
|
uint32_t new_seed = (uint32_t)seed;
|
|
|
|
if (hashtable_seed == 0) {
|
|
if (__atomic_test_and_set(&seed_initialized, __ATOMIC_RELAXED) == 0) {
|
|
/* Do the seeding ourselves */
|
|
if (new_seed == 0)
|
|
new_seed = generate_seed();
|
|
|
|
__atomic_store_n(&hashtable_seed, new_seed, __ATOMIC_RELEASE);
|
|
} else {
|
|
/* Wait for another thread to do the seeding */
|
|
do {
|
|
#ifdef HAVE_SCHED_YIELD
|
|
sched_yield();
|
|
#endif
|
|
} while(__atomic_load_n(&hashtable_seed, __ATOMIC_ACQUIRE) == 0);
|
|
}
|
|
}
|
|
}
|
|
#elif defined(HAVE_SYNC_BUILTINS) && (defined(HAVE_SCHED_YIELD) || !defined(_WIN32))
|
|
void json_object_seed(size_t seed) {
|
|
uint32_t new_seed = (uint32_t)seed;
|
|
|
|
if (hashtable_seed == 0) {
|
|
if (new_seed == 0) {
|
|
/* Explicit synchronization fences are not supported by the
|
|
__sync builtins, so every thread getting here has to
|
|
generate the seed value.
|
|
*/
|
|
new_seed = generate_seed();
|
|
}
|
|
|
|
do {
|
|
if (__sync_bool_compare_and_swap(&hashtable_seed, 0, new_seed)) {
|
|
/* We were the first to seed */
|
|
break;
|
|
} else {
|
|
/* Wait for another thread to do the seeding */
|
|
#ifdef HAVE_SCHED_YIELD
|
|
sched_yield();
|
|
#endif
|
|
}
|
|
} while(hashtable_seed == 0);
|
|
}
|
|
}
|
|
#elif defined(_WIN32)
|
|
static long seed_initialized = 0;
|
|
void json_object_seed(size_t seed) {
|
|
uint32_t new_seed = (uint32_t)seed;
|
|
|
|
if (hashtable_seed == 0) {
|
|
if (InterlockedIncrement(&seed_initialized) == 1) {
|
|
/* Do the seeding ourselves */
|
|
if (new_seed == 0)
|
|
new_seed = generate_seed();
|
|
|
|
hashtable_seed = new_seed;
|
|
} else {
|
|
/* Wait for another thread to do the seeding */
|
|
do {
|
|
SwitchToThread();
|
|
} while (hashtable_seed == 0);
|
|
}
|
|
}
|
|
}
|
|
#else
|
|
/* Fall back to a thread-unsafe version */
|
|
void json_object_seed(size_t seed) {
|
|
uint32_t new_seed = (uint32_t)seed;
|
|
|
|
if (hashtable_seed == 0) {
|
|
if (new_seed == 0)
|
|
new_seed = generate_seed();
|
|
|
|
hashtable_seed = new_seed;
|
|
}
|
|
}
|
|
#endif
|