blob: a16d5875422a517aeee222322c2a820ea100452f [file] [log] [blame]
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
* Copyright (c) 2013-2016 Regents of the University of California.
*
* This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
*
* ndn-cxx 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 3 of the License, or (at your option) any later version.
*
* ndn-cxx 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 copies of the GNU General Public License and GNU Lesser
* General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
* <http://www.gnu.org/licenses/>.
*
* See AUTHORS.md for complete list of ndn-cxx authors and contributors.
*/
#include "common.hpp"
#include "random.hpp"
#include "../security/detail/openssl.hpp"
#include <boost/nondet_random.hpp>
#include <boost/random/mersenne_twister.hpp>
#include <boost/random/uniform_int_distribution.hpp>
namespace ndn {
namespace random {
// OpenSSL-based (secure) pseudo-randomness generators
uint32_t
generateSecureWord32()
{
uint32_t random;
generateSecureBytes(reinterpret_cast<uint8_t*>(&random), sizeof(random));
return random;
}
uint64_t
generateSecureWord64()
{
uint64_t random;
generateSecureBytes(reinterpret_cast<uint8_t*>(&random), sizeof(random));
return random;
}
void
generateSecureBytes(uint8_t* bytes, size_t size)
{
if (RAND_bytes(bytes, size) != 1) {
BOOST_THROW_EXCEPTION(std::runtime_error("Failed to generate random bytes (error code " +
std::to_string(ERR_get_error()) + ")"));
}
}
// Boost.Random-based (simple) random generators
static boost::random::mt19937&
getRandomGenerator()
{
static boost::random_device randomSeedGenerator;
static boost::random::mt19937 gen(randomSeedGenerator);
return gen;
}
uint32_t
generateWord32()
{
static boost::random::uniform_int_distribution<uint32_t> distribution;
return distribution(getRandomGenerator());
}
uint64_t
generateWord64()
{
static boost::random::uniform_int_distribution<uint64_t> distribution;
return distribution(getRandomGenerator());
}
} // namespace random
} // namespace ndn