Botan  2.15.0
Crypto and TLS for C++11
Classes | Functions | Variables
Botan::Roughtime Namespace Reference

Classes

class  Chain
 
class  Link
 
class  Nonce
 
class  Response
 
class  Roughtime_Error
 
struct  Server_Information
 

Functions

std::array< uint8_t, request_min_sizeencode_request (const Nonce &nonce)
 
Nonce nonce_from_blind (const std::vector< uint8_t > &previous_response, const Nonce &blind)
 
std::vector< uint8_t > online_request (const std::string &uri, const Nonce &nonce, std::chrono::milliseconds timeout)
 
std::vector< Server_Informationservers_from_str (const std::string &str)
 

Variables

const unsigned request_min_size = 1024
 

Function Documentation

◆ encode_request()

std::array< uint8_t, request_min_size > Botan::Roughtime::encode_request ( const Nonce nonce)

An Roughtime request.

Definition at line 169 of file roughtime.cpp.

References Botan::Roughtime::Nonce::get_nonce().

Referenced by online_request().

170  {
171  std::array<uint8_t, request_min_size> buf = {{2, 0, 0, 0, 64, 0, 0, 0, 'N', 'O', 'N', 'C', 'P', 'A', 'D', 0xff}};
172  std::memcpy(buf.data() + 16, nonce.get_nonce().data(), nonce.get_nonce().size());
173  std::memset(buf.data() + 16 + nonce.get_nonce().size(), 0, buf.size() - 16 - nonce.get_nonce().size());
174  return buf;
175  }

◆ nonce_from_blind()

Nonce Botan::Roughtime::nonce_from_blind ( const std::vector< uint8_t > &  previous_response,
const Nonce blind 
)

Definition at line 237 of file roughtime.cpp.

References Botan::HashFunction::create_or_throw(), Botan::Roughtime::Nonce::get_nonce(), and hash.

Referenced by Botan::Roughtime::Chain::append(), Botan::Roughtime::Chain::next_nonce(), and Botan::Roughtime::Chain::responses().

239  {
240  std::array<uint8_t, 64> ret;
241  const auto blind_arr = blind.get_nonce();
242  std::unique_ptr<Botan::HashFunction> hash(Botan::HashFunction::create_or_throw("SHA-512"));
243  hash->update(previous_response);
244  hash->update(hash->final());
245  hash->update(blind_arr.data(), blind_arr.size());
246  hash->final(ret.data());
247 
248  return ret;
249  }
static std::unique_ptr< HashFunction > create_or_throw(const std::string &algo_spec, const std::string &provider="")
Definition: hash.cpp:344
MechanismType hash

◆ online_request()

std::vector< uint8_t > Botan::Roughtime::online_request ( const std::string &  url,
const Nonce nonce,
std::chrono::milliseconds  timeout = std::chrono::seconds(3) 
)

Makes an online Roughtime request via UDP and returns the Roughtime response.

Parameters
urlRoughtime server UDP endpoint (host:port)
noncethe nonce to send to the server
timeouta timeout on the UDP request
Returns
Roughtime response

Definition at line 363 of file roughtime.cpp.

References encode_request(), and Botan::OS::open_socket_udp().

366  {
367  const std::chrono::system_clock::time_point start_time = std::chrono::system_clock::now();
368  auto socket = OS::open_socket_udp(uri, timeout);
369  if(!socket)
370  { throw Not_Implemented("No socket support enabled in build"); }
371 
372  const auto encoded = encode_request(nonce);
373  socket->write(encoded.data(), encoded.size());
374 
375  if(std::chrono::system_clock::now() - start_time > timeout)
376  { throw System_Error("Timeout during socket write"); }
377 
378  std::vector<uint8_t> buffer;
379  buffer.resize(360+64*10+1); //response basic size is 360 bytes + 64 bytes for each level of merkle tree
380  //add one additional byte to be able to differentiate if datagram got truncated
381  const auto n = socket->read(buffer.data(), buffer.size());
382 
383  if(!n || std::chrono::system_clock::now() - start_time > timeout)
384  { throw System_Error("Timeout waiting for response"); }
385 
386  if(n == buffer.size())
387  { throw System_Error("Buffer too small"); }
388 
389  buffer.resize(n);
390  return buffer;
391  }
std::unique_ptr< SocketUDP > BOTAN_TEST_API open_socket_udp(const std::string &hostname, const std::string &service, std::chrono::microseconds timeout)
Definition: socket_udp.cpp:318
std::array< uint8_t, request_min_size > encode_request(const Nonce &nonce)
Definition: roughtime.cpp:169

◆ servers_from_str()

std::vector< Server_Information > Botan::Roughtime::servers_from_str ( const std::string &  str)

Definition at line 393 of file roughtime.cpp.

References Botan::base64_decode(), and name.

394  {
395  std::vector<Server_Information> servers;
396  std::stringstream ss(str);
397  const std::string ERROR_MESSAGE = "Line does not have at least 5 space separated fields";
398  for(std::string s; std::getline(ss, s);)
399  {
400  size_t start = 0, end = 0;
401  end = s.find(' ', start);
402  if(end == std::string::npos)
403  {
404  throw Decoding_Error(ERROR_MESSAGE);
405  }
406  const auto name = s.substr(start, end-start);
407 
408  start = end + 1;
409  end = s.find(' ', start);
410  if(end == std::string::npos)
411  {
412  throw Decoding_Error(ERROR_MESSAGE);
413  }
414  const auto publicKeyType = s.substr(start, end-start);
415  if(publicKeyType != "ed25519")
416  { throw Not_Implemented("Only ed25519 publicKeyType is implemented"); }
417 
418  start = end + 1;
419  end = s.find(' ', start);
420 
421  if(end == std::string::npos)
422  {
423  throw Decoding_Error(ERROR_MESSAGE);
424  }
425  const auto publicKeyBase64 = s.substr(start, end-start);
426  const auto publicKey = Botan::Ed25519_PublicKey(Botan::base64_decode(publicKeyBase64));
427 
428  start = end + 1;
429  end = s.find(' ', start);
430  if(end == std::string::npos)
431  {
432  throw Decoding_Error(ERROR_MESSAGE);
433  }
434  const auto protocol = s.substr(start, end-start);
435  if(protocol != "udp")
436  { throw Not_Implemented("Only UDP protocol is implemented"); }
437 
438  const auto addresses = [&]()
439  {
440  std::vector<std::string> addr;
441  for(;;)
442  {
443  start = end + 1;
444  end = s.find(' ', start);
445  const auto address = s.substr(start, (end == std::string::npos) ? std::string::npos : end-start);
446  if(address.empty())
447  { return addr; }
448  addr.push_back(address);
449  if(end == std::string::npos)
450  { return addr; }
451  }
452  }
453  ();
454  if(addresses.size() == 0)
455  {
456  throw Decoding_Error(ERROR_MESSAGE);
457  }
458 
459  servers.push_back({name, publicKey, std::move(addresses)});
460  }
461  return servers;
462  }
std::string name
size_t base64_decode(uint8_t out[], const char in[], size_t input_length, size_t &input_consumed, bool final_inputs, bool ignore_ws)
Definition: base64.cpp:181

Variable Documentation

◆ request_min_size

const unsigned Botan::Roughtime::request_min_size = 1024

Definition at line 23 of file roughtime.h.