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networking.cpp
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networking.cpp
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#include "networking.h"
#include <cstring>
#include "conversions.h"
// TODO: Handle errors more clearly in the future!
Networking::connection::connection(int port) {
WSADATA wsaData;
Networking::connection::port = port;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
Logger::systemLogger.addLog(Logger::fatal, "WSAStartup failed.");
}
sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sockfd == INVALID_SOCKET) {
Logger::systemLogger.addLog(Logger::fatal, "Socket creation failure.");
}
broadcastEnable = TRUE;
if (setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, (const char*)&broadcastEnable, sizeof(broadcastEnable)) == SOCKET_ERROR) {
Logger::systemLogger.addLog(Logger::fatal, "Set socket option error");
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_BROADCAST);
Logger::systemLogger.addLog(Logger::info, "Socket succesfully created.");
}
Networking::connection::~connection() {
closesocket(sockfd);
WSACleanup();
Logger::systemLogger.addLog(Logger::info, "Succefully cleaned up networking connections.");
}
bool Networking::connection::sendMessage(const char* message) {
int result = sendto(sockfd, message, strlen(message), 0, (sockaddr*)&addr, sizeof(addr));
if (result == SOCKET_ERROR) {
Logger::systemLogger.addLog(Logger::error, "Sendto Error.");
return false;
}
Logger::systemLogger.addLog(Logger::info, "Succesfully sent message.");
return true;
}
bool Networking::connection::recieveMessage(std::string& message) {
char buffer[1024];
sockaddr_in senderAddr;
int senderAddrSize = sizeof(senderAddr);
int bytesRecieved = recvfrom(sockfd, buffer, sizeof(buffer), 0, (sockaddr*)&senderAddr, &senderAddrSize);
if (bytesRecieved == SOCKET_ERROR) {
Logger::systemLogger.addLog(Logger::error, "Recvfrom error.");
return false;
}
// Appends message with a
buffer[bytesRecieved] = '\0';
message.assign(buffer, bytesRecieved);
return true;
}
void Networking::connection::changePort(int port) {
Networking::connection::port = port;
addr.sin_port = htons(port);
}
void Networking::connection::endConnection() {
int result = sendto(sockfd, "-1", strlen("-1"), 0, (sockaddr*)&addr, sizeof(addr));
if (result == SOCKET_ERROR) {
Logger::systemLogger.addLog(Logger::error, "Sendto Error.");
return;
}
Logger::systemLogger.addLog(Logger::info, "Succesfully closed connection.");
}
Networking::encryption::encryption() {
Twofish_initialise();
Twofish_Byte key[32];
generate_key(key);
Twofish_prepare_key(key, 32, &xkey);
}
void Networking::encryption::encrypt(Twofish_Byte p[16], Twofish_Byte c[16]) {
Twofish_encrypt(&xkey, p, c);
}
void Networking::encryption::decrypt(Twofish_Byte c[16], Twofish_Byte p[16]) {
Twofish_decrypt(&xkey, c, p);
}
int Networking::encryption::gcd(int a, int b) {
int t;
while (1) {
t = a % b;
if (t == 0) {
return b;
}
a = b;
b = t;
}
}
int Networking::encryption::expmod(int base, int exp, int mod) {
if (exp == 0) {
return 1;
}
if (exp % 2 == 0) {
return (int)pow(expmod(base, (exp / 2), mod), 2) % mod;
}
else {
return (base * expmod(base, (exp - 1), mod)) % mod;
}
}
bool Networking::encryption::trial_composite(int round_tester, int even_component, int miller_rabin_canidate, int max_division_by_two) {
if (expmod(round_tester, even_component, miller_rabin_canidate) == 1) {
return false;
}
for (int i = 0; i < max_division_by_two; i++) {
if (expmod(round_tester, (1 << i) * even_component, miller_rabin_canidate) == miller_rabin_canidate - 1) {
return false;
}
}
return true;
}
bool Networking::encryption::is_miller_rabin_passed(int miller_rabin_canidate) {
int max_divisions_by_two = 0;
int even_component = miller_rabin_canidate - 1;
while (even_component % 2 == 0) {
even_component >> 1;
max_divisions_by_two += 1;
}
int number_of_rabin_trials = 20;
for (int i = 0; i < (number_of_rabin_trials); i++) {
int round_tester = rand() * (miller_rabin_canidate - 2) + 2;
if (trial_composite(round_tester, even_component, miller_rabin_canidate, max_divisions_by_two)) {
return false;
}
}
return true;
}
int Networking::encryption::rand_prime_num() {
return 1;
}
void Networking::encryption::generate_key(Twofish_Byte internal_key[32]) {
HCRYPTPROV hCryptProv;
BYTE key[32];
if (CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) {
if (CryptGenRandom(hCryptProv, sizeof(key), key)) {
internal_key = key;
}
CryptReleaseContext(hCryptProv, 0);
}
}
Networking::encryption::~encryption() {
}