NS-3 based Named Data Networking (NDN) simulator
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random.cpp
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1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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
31 generateSecureWord32()
32 {
33  uint32_t random;
34  generateSecureBytes(reinterpret_cast<uint8_t*>(&random), sizeof(random));
35  return random;
36 }
37 
38 uint64_t
39 generateSecureWord64()
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  std::to_string(ERR_get_error()) + ")"));
52  }
53 }
54 
55 static std::mt19937&
56 getRandomGenerator()
57 {
58  static std::mt19937 rng{std::random_device{}()};
59  return rng;
60 }
61 
62 uint32_t
63 generateWord32()
64 {
65  static std::uniform_int_distribution<uint32_t> distribution;
66  return distribution(getRandomGenerator());
67 }
68 
69 uint64_t
70 generateWord64()
71 {
72  static std::uniform_int_distribution<uint64_t> distribution;
73  return distribution(getRandomGenerator());
74 }
75 
76 } // namespace random
77 } // namespace ndn
ndn
Copyright (c) 2011-2015 Regents of the University of California.
Definition: ndn-strategy-choice-helper.hpp:34
ndn::random::getRandomGenerator
static std::mt19937 & getRandomGenerator()
Definition: random.cpp:56
ndn::random::generateSecureWord64
uint64_t generateSecureWord64()
Generate a cryptographically secure random integer from the range [0, 2^64)
Definition: random.cpp:39
ndn::random::generateWord32
uint32_t generateWord32()
Generate a non-cryptographically-secure random integer in the range [0, 2^32)
Definition: random.cpp:63
ndn::random::generateSecureWord32
uint32_t generateSecureWord32()
Generate a cryptographically secure random integer from the range [0, 2^32)
Definition: random.cpp:31
ndn::random::generateWord64
uint64_t generateWord64()
Generate a non-cryptographically-secure random integer in the range [0, 2^64)
Definition: random.cpp:70
ndn::random::generateSecureBytes
void generateSecureBytes(uint8_t *bytes, size_t size)
Fill bytes of size with cryptographically secure random bytes.
Definition: random.cpp:47
ndn::to_string
std::string to_string(const V &v)
Definition: backports.hpp:51