random.cpp
Go to the documentation of this file.
1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2013-2017 Regents of the University of California.
4  *
5  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
6  *
7  * ndn-cxx library is free software: you can redistribute it and/or modify it under the
8  * terms of the GNU Lesser General Public License as published by the Free Software
9  * Foundation, either version 3 of the License, or (at your option) any later version.
10  *
11  * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
12  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
13  * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
14  *
15  * You should have received copies of the GNU General Public License and GNU Lesser
16  * General Public License along with ndn-cxx, e.g., in COPYING.md file. If not, see
17  * <http://www.gnu.org/licenses/>.
18  *
19  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
20  */
21 
22 #include "random.hpp"
23 #include "../security/detail/openssl.hpp"
24 
25 #include <random>
26 
27 namespace ndn {
28 namespace random {
29 
30 uint32_t
32 {
33  uint32_t random;
34  generateSecureBytes(reinterpret_cast<uint8_t*>(&random), sizeof(random));
35  return random;
36 }
37 
38 uint64_t
40 {
41  uint64_t random;
42  generateSecureBytes(reinterpret_cast<uint8_t*>(&random), sizeof(random));
43  return random;
44 }
45 
46 void
47 generateSecureBytes(uint8_t* bytes, size_t size)
48 {
49  if (RAND_bytes(bytes, size) != 1) {
50  BOOST_THROW_EXCEPTION(std::runtime_error("Failed to generate random bytes (error code " +
51  to_string(ERR_get_error()) + ")"));
52  }
53 }
54 
55 static std::mt19937&
57 {
58  static std::mt19937 rng{std::random_device{}()};
59  return rng;
60 }
61 
62 uint32_t
64 {
65  static std::uniform_int_distribution<uint32_t> distribution;
66  return distribution(getRandomGenerator());
67 }
68 
69 uint64_t
71 {
72  static std::uniform_int_distribution<uint64_t> distribution;
73  return distribution(getRandomGenerator());
74 }
75 
76 } // namespace random
77 } // namespace ndn
Copyright (c) 2013-2017 Regents of the University of California.
Definition: common.hpp:66
static std::mt19937 & getRandomGenerator()
Definition: random.cpp:56
uint64_t generateSecureWord64()
Generate a cryptographically secure random integer from the range [0, 2^64)
Definition: random.cpp:39
uint32_t generateWord32()
Generate a non-cryptographically-secure random integer in the range [0, 2^32)
Definition: random.cpp:63
uint32_t generateSecureWord32()
Generate a cryptographically secure random integer from the range [0, 2^32)
Definition: random.cpp:31
uint64_t generateWord64()
Generate a non-cryptographically-secure random integer in the range [0, 2^64)
Definition: random.cpp:70
void generateSecureBytes(uint8_t *bytes, size_t size)
Fill bytes of size with cryptographically secure random bytes.
Definition: random.cpp:47
std::string to_string(const V &v)
Definition: backports.hpp:107