mirror of https://github.com/aria2/aria2
129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2006 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "SimpleRandomizer.h"
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#include <sys/types.h>
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#include <unistd.h>
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#include <cstdlib>
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#include <cassert>
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#include <cstring>
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#include "a2time.h"
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namespace aria2 {
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std::unique_ptr<SimpleRandomizer> SimpleRandomizer::randomizer_;
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const std::unique_ptr<SimpleRandomizer>& SimpleRandomizer::getInstance()
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{
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if(!randomizer_) {
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randomizer_.reset(new SimpleRandomizer());
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}
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return randomizer_;
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}
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void SimpleRandomizer::init()
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{
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#ifndef __MINGW32__
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// Just in case std::random_device() is fixed, add time and pid too.
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eng_.seed(std::random_device()()^time(nullptr)^getpid());
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#endif // !__MINGW32__
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}
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SimpleRandomizer::SimpleRandomizer()
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{
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#ifdef __MINGW32__
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BOOL r = CryptAcquireContext(&cryProvider_, 0, 0, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT|CRYPT_SILENT);
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assert(r);
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#endif // __MINGW32__
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}
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SimpleRandomizer::~SimpleRandomizer()
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{
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#ifdef __MINGW32__
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CryptReleaseContext(cryProvider_, 0);
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#endif // __MINGW32__
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}
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long int SimpleRandomizer::getRandomNumber(long int to)
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{
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assert(to > 0);
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#ifdef __MINGW32__
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int32_t val;
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BOOL r = CryptGenRandom(cryProvider_, sizeof(val),
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reinterpret_cast<BYTE*>(&val));
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assert(r);
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if(val == INT32_MIN) {
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val = INT32_MAX;
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} else if(val < 0) {
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val = -val;
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}
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return val % to;
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#else // !__MINGW32__
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return std::uniform_int_distribution<long int>(0, to - 1)(eng_);
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#endif // !__MINGW32__
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}
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long int SimpleRandomizer::operator()(long int to)
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{
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return getRandomNumber(to);
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}
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void SimpleRandomizer::getRandomBytes(unsigned char *buf, size_t len)
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{
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#ifdef __MINGW32__
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if (!CryptGenRandom(cryProvider_, len, (PBYTE)buf)) {
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throw std::bad_alloc();
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}
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#else
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uint32_t val;
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size_t q = len / sizeof(val);
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size_t r = len % sizeof(val);
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auto gen = std::bind(std::uniform_int_distribution<uint32_t>
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(0, std::numeric_limits<uint32_t>::max()),
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eng_);
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for(; q > 0; --q) {
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val = gen();
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memcpy(buf, &val, sizeof(val));
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buf += sizeof(val);
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}
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val = gen();
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memcpy(buf, &val, r);
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#endif
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}
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} // namespace aria2
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