mirror of
https://github.com/danog/ton.git
synced 2024-12-11 08:39:51 +01:00
123 lines
3.0 KiB
C++
123 lines
3.0 KiB
C++
/*
|
|
This file is part of TON Blockchain Library.
|
|
|
|
TON Blockchain Library is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation, either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
TON Blockchain Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
Copyright 2017-2019 Telegram Systems LLP
|
|
*/
|
|
#include "openssl/rand.hpp"
|
|
|
|
#include "td/utils/common.h"
|
|
|
|
#include <openssl/rand.h>
|
|
#include <openssl/opensslv.h>
|
|
|
|
namespace prng {
|
|
int os_get_random_bytes(void *buf, int n);
|
|
|
|
bool RandomGen::ok() const {
|
|
return RAND_status();
|
|
}
|
|
|
|
void RandomGen::seed_add(const void *data, std::size_t size, double entropy) {
|
|
RAND_add(data, static_cast<int>(size), entropy > 0 ? entropy : static_cast<double>(size));
|
|
}
|
|
|
|
void RandomGen::randomize(bool force) {
|
|
if (!force && ok()) {
|
|
return;
|
|
}
|
|
unsigned char buffer[128];
|
|
int n = os_get_random_bytes(buffer, 128);
|
|
seed_add(buffer, n);
|
|
assert(ok());
|
|
}
|
|
|
|
bool RandomGen::rand_bytes(void *data, std::size_t size, bool strong) {
|
|
#if OPENSSL_VERSION_NUMBER < 0x10101000L
|
|
int res = (strong ? RAND_bytes : RAND_pseudo_bytes)((unsigned char *)data, static_cast<int>(size));
|
|
#else
|
|
int res = RAND_bytes((unsigned char *)data, static_cast<int>(size));
|
|
#endif
|
|
if (res != 0 && res != 1) {
|
|
throw rand_error();
|
|
}
|
|
return res;
|
|
}
|
|
|
|
std::string RandomGen::rand_string(std::size_t size, bool strong) {
|
|
std::string result(size, '\0');
|
|
if (size > 0 && !rand_bytes(&result[0], size, strong)) {
|
|
throw rand_error();
|
|
}
|
|
return result;
|
|
}
|
|
|
|
RandomGen &rand_gen() {
|
|
// RandomGen is stateless, OpenSSL will handle concurrent access
|
|
static RandomGen MainPRNG;
|
|
return MainPRNG;
|
|
}
|
|
} // namespace prng
|
|
|
|
//------------------------- move to separate OS-dependent file?
|
|
#if TD_WINDOWS
|
|
namespace prng {
|
|
int os_get_random_bytes(void *buf, int n) {
|
|
return 0;
|
|
}
|
|
} // namespace prng
|
|
#else
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
namespace prng {
|
|
|
|
int os_get_random_bytes(void *buf, int n) {
|
|
using namespace std;
|
|
int r = 0;
|
|
int h = open("/dev/random", O_RDONLY | O_NONBLOCK);
|
|
if (h >= 0) {
|
|
r = static_cast<int>(read(h, buf, n));
|
|
if (r > 0) {
|
|
//std::cerr << "added " << r << " bytes of real entropy to secure random numbers seed" << std::endl;
|
|
} else {
|
|
r = 0;
|
|
}
|
|
close(h);
|
|
}
|
|
|
|
if (r < n) {
|
|
h = open("/dev/urandom", O_RDONLY);
|
|
if (h < 0) {
|
|
return r;
|
|
}
|
|
int s = static_cast<int>(read(h, (char *)buf + r, n - r));
|
|
close(h);
|
|
if (s < 0) {
|
|
return r;
|
|
}
|
|
r += s;
|
|
}
|
|
|
|
if (r >= 8) {
|
|
*(long *)buf ^= lrand48();
|
|
srand48(*(long *)buf);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
} // namespace prng
|
|
#endif
|