| /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */ |
| /* |
| * Copyright (c) 2013-2023 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. |
| */ |
| |
| #ifndef NDN_CXX_UTIL_RANDOM_HPP |
| #define NDN_CXX_UTIL_RANDOM_HPP |
| |
| #include "ndn-cxx/detail/common.hpp" |
| #include "ndn-cxx/util/span.hpp" |
| |
| #include <random> |
| |
| namespace ndn::random { |
| |
| /** |
| * @brief Generate a cryptographically secure random integer from the range [0, 2^32) |
| * |
| * @throw std::runtime_error if generation fails. |
| */ |
| uint32_t |
| generateSecureWord32(); |
| |
| /** |
| * @brief Generate a cryptographically secure random integer from the range [0, 2^64) |
| * |
| * @throw std::runtime_error if generation fails. |
| */ |
| uint64_t |
| generateSecureWord64(); |
| |
| /** |
| * @brief Fill @p buffer with cryptographically secure random bytes |
| * |
| * @throw std::runtime_error if generation fails. |
| */ |
| void |
| generateSecureBytes(span<uint8_t> buffer); |
| |
| using RandomNumberEngine = std::mt19937; |
| |
| /** |
| * @brief Returns a reference to a thread-local instance of a properly seeded PRNG |
| * |
| * @warning The returned RandomNumberEngine MUST NOT be used when cryptographically secure |
| * random numbers are needed. |
| */ |
| RandomNumberEngine& |
| getRandomNumberEngine(); |
| |
| /** |
| * @brief Generate a non-cryptographically-secure random integer in the range [0, 2^32) |
| * |
| * This version is faster than generateSecureWord32, but it must not be used when |
| * cryptographically secure random integers are needed (e.g., when creating signing or |
| * encryption keys) |
| */ |
| uint32_t |
| generateWord32(); |
| |
| /** |
| * @brief Generate a non-cryptographically-secure random integer in the range [0, 2^64) |
| * |
| * This version is faster than generateSecureWord64, but it must not be used when |
| * cryptographically secure random integers are needed (e.g., when creating signing or |
| * encryption keys) |
| */ |
| uint64_t |
| generateWord64(); |
| |
| } // namespace ndn::random |
| |
| #endif // NDN_CXX_UTIL_RANDOM_HPP |