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#include "Cryptor.h"
bool Cryptor::haveKey = false;
unsigned char Cryptor::key[CryptoPP::AES::DEFAULT_KEYLENGTH];
void Cryptor::encryptAndSave(std::string remoteHost, std::string port, std::string directory, std::string payload) {
// Key
if (!haveKey)
assembleKey(true);
// IV
unsigned char iv[CryptoPP::AES::BLOCKSIZE];
CryptoPP::AutoSeededRandomPool randl;
randl.GenerateBlock(iv, sizeof(iv));
// Encrypt
std::string cipher;
CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption enc(key, sizeof(key), iv);
CryptoPP::StringSource(payload, true, new CryptoPP::StreamTransformationFilter(enc, new CryptoPP::StringSink(cipher)));
// Save Data
std::string encIV, encCipher;
CryptoPP::StringSource(iv, sizeof(iv), true, new CryptoPP::HexEncoder(new CryptoPP::StringSink(encIV)));
CryptoPP::StringSource(cipher, true, new CryptoPP::HexEncoder(new CryptoPP::StringSink(encCipher)));
if (remoteHost == "") {
if (directory[directory.size() - 1] != '/') directory += "/";
directory += KEYCHAIN_FILE;
std::ofstream f(directory.c_str());
f << encIV << std::endl;
f << encCipher << std::endl;
f.close();
}
else {
Socket s;
std::string err = "";
s.conn(remoteHost, port);
s.sendline("store");
s.sendline(directory);
s.sendline(encIV);
s.sendline(encCipher);
err = s.readline();
s.clo();
if (err != "OK") throw 1;
}
}
std::string Cryptor::loadAndDecrypt(std::string remoteHost, std::string port, std::string directory) {
// Load Data
std::string encIV, encCipher, ivstr, cipher;
if (remoteHost == "") {
if (directory[directory.size() - 1] != '/') directory += "/";
directory += KEYCHAIN_FILE;
std::ifstream f(directory.c_str());
if (!f.good()) {
f.close();
throw 1;
}
f >> encIV;
f >> encCipher;
f.close();
}
else {
Socket s;
std::string err = "";
s.conn(remoteHost, port);
s.sendline("fetch");
s.sendline(directory);
err = s.readline();
if (err != "OK") {
s.clo();
throw 1;
}
encIV = s.readline();
encCipher = s.readline();
s.clo();
}
CryptoPP::StringSource(encIV, true, new CryptoPP::HexDecoder(new CryptoPP::StringSink(ivstr)));
CryptoPP::StringSource(encCipher, true, new CryptoPP::HexDecoder(new CryptoPP::StringSink(cipher)));
// Key
if (!haveKey)
assembleKey();
// IV
unsigned char iv[CryptoPP::AES::BLOCKSIZE];
memcpy(iv, ivstr.c_str(), ivstr.size());
// Decrypt
std::string payload;
CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption dec(key, sizeof(key), iv);
CryptoPP::StringSource(cipher, true, new CryptoPP::StreamTransformationFilter(dec, new CryptoPP::StringSink(payload)));
return payload;
}
std::string Cryptor::createRandomPassword(PasswordSpec spec) {
CryptoPP::AutoSeededRandomPool randl;
std::string password;
std::vector<char> validChars;
// Always allow lower-case alphabetic characters
for (int i = 0; i < 26; i++)
validChars.push_back('a' + i);
// Allow special chars?
if (!spec.ns) {
validChars.push_back('`');
validChars.push_back('~');
validChars.push_back('!');
validChars.push_back('@');
validChars.push_back('#');
validChars.push_back('$');
validChars.push_back('%');
validChars.push_back('^');
validChars.push_back('&');
validChars.push_back('*');
validChars.push_back('(');
validChars.push_back(')');
validChars.push_back('-');
validChars.push_back('_');
validChars.push_back('=');
validChars.push_back('+');
validChars.push_back('[');
validChars.push_back('{');
validChars.push_back(']');
validChars.push_back('}');
validChars.push_back('\\');
validChars.push_back('|');
validChars.push_back(';');
validChars.push_back(':');
validChars.push_back(',');
validChars.push_back('<');
validChars.push_back('.');
validChars.push_back('>');
validChars.push_back('/');
validChars.push_back('?');
}
// Allow capital letters?
if (!spec.nc) {
for (int i = 0; i < 26; i++)
validChars.push_back('A' + i);
}
// Allow numbers?
if (!spec.nn) {
for (int i = 0; i < 10; i++)
validChars.push_back('0' + i);
}
// Build string
for (int i = 0; i < spec.ml; i++) {
unsigned char r[1];
char c;
randl.GenerateBlock(r, sizeof(r));
c = validChars[r[0] % validChars.size()];
password += c;
}
return password;
}
void Cryptor::rekey() {
haveKey = false;
}
void Cryptor::sha256(std::string str) {
CryptoPP::SHA256 hash;
std::string rtr;
CryptoPP::StringSource(str, true, new CryptoPP::HashFilter(hash, new CryptoPP::StringSink(rtr), false, CryptoPP::AES::DEFAULT_KEYLENGTH));
memcpy(key, rtr.c_str(), rtr.size());
haveKey = true;
}
std::string Cryptor::readPassword(bool confirm) {
std::string password;
#ifdef WIN32
HANDLE hstdin = GetStdHandle(STD_INPUT_HANDLE);
DWORD mode = 0;
GetConsoleMode(hstdin, &mode);
SetConsoleMode(hstdin, mode & ~ENABLE_ECHO_INPUT);
password = promptPassword(confirm);
SetConsoleMode(hstdin, mode);
#else
termios oldt;
tcgetattr(STDIN_FILENO, &oldt);
termios newt = oldt;
newt.c_lflag &= ~ECHO;
tcsetattr(STDIN_FILENO, TCSANOW, &newt);
password = promptPassword(confirm);
tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
#endif // WIN32
return password;
}
std::string Cryptor::readPassword() {
return readPassword(false);
}
void Cryptor::assembleKey(bool confirm) {
sha256(readPassword(confirm));
}
void Cryptor::assembleKey() {
assembleKey(false);
}
std::string Cryptor::promptPassword(bool confirm) {
std::string password;
while (true) {
std::cout << PASSWORD_PROMPT;
std::cin >> password;
std::cout << std::endl;
if (confirm) {
std::string conf;
std::cout << PASSWORD_CONF;
std::cin >> conf;
std::cout << std::endl;
if (password == conf)
break;
else
std::cout << PASSWORD_ERROR << std::endl;
}
else
break;
}
return password;
}
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