//TODO: Impement RSA
void RSA()
{
llong p = get_prime_number(1, 30'000);
llong q = get_prime_number(1, 30'000);
llong n = p * q;
llong fi = (p - 1) * (q - 1);
// Get c and d
llong d{0};
llong gcd{0}, x{0}, y{0}, c{0};
while (true) {
d = get_prime_number(1, fi -1);
generalized_euclid(d, fi, gcd, x, y);
if (gcd == 1) {
break;
}
}
generalized_euclid(d, fi, gcd, x, y);
if (x < 0) {
c = fi + x;
} else {
c = x;
}
// Open file w/ message
std::ifstream msg("example", std::ios::binary | std::ios::in);
if (!msg.is_open()) {
std::cerr << "File not found" << std::endl;
}
llong m{0}, e{0};
// Encode
std::ofstream encode_out("rsa_encode", std::ios::binary | std::ios::out);
while (msg.read((char*)&m, sizeof(char))) {
e = pow_module(m, d, n);
encode_out.write((char*)&e, sizeof(llong));
}
msg.close();
encode_out.close();
// Decode
std::ifstream encode_in("rsa_encode", std::ios::binary | std::ios::in);
std::ofstream decode_out("rsa_decode", std::ios::binary | std::ios::out);
while (encode_in.read((char*)&e, sizeof(llong))) {
m = pow_module(e, c, n);
decode_out.write((char*)&m, sizeof(char));
}
encode_in.close();
decode_out.close();
}
int encode_in_ev(Gzb64* gzb64, struct evbuffer* input)
{
int contiguous;
unsigned char* input_block;
while(evbuffer_get_length(input) > 0)
{
contiguous = evbuffer_get_contiguous_space(input);
input_block = evbuffer_pullup(input, contiguous);
if( contiguous < evbuffer_get_length(input) )
{
encode_in(gzb64, &input_block[0], contiguous, false);
evbuffer_drain(input, contiguous);
} else
{
/* last (only) block */
encode_in(gzb64, &input_block[0], contiguous, true);
evbuffer_drain(input, contiguous);
}
}
return 0;
}
inline bool encode(const char *data, uint32_t dataSize, const std::string& outFile, const std::string& pass, bool isOffice2013, const std::string& masterKey, int spinCount)
{
std::string encryptedPackage;
ms::EncryptionInfo info;
const cybozu::crypto::Cipher::Name cipherName = isOffice2013 ? cybozu::crypto::Cipher::N_AES256_CBC : cybozu::crypto::Cipher::N_AES128_CBC;
const cybozu::crypto::Hash::Name hashName = isOffice2013 ? cybozu::crypto::Hash::N_SHA512 : cybozu::crypto::Hash::N_SHA1;
encode_in(encryptedPackage, info, std::string(data, dataSize), cipherName, hashName, spinCount, pass, masterKey);
const std::string encryptionInfoStr = info.addHeader(info.toXml(isOffice2013));
dprintf("encryptionInfoStr size=%d\n", (int)encryptionInfoStr.size());
ms::cfb::CompoundFile cfb;
ms::makeDataSpace(cfb.dirs, encryptedPackage, encryptionInfoStr);
std::string outData;
makeLayout(outData, cfb);
{
std::ofstream ofs(outFile.c_str(), std::ios::binary);
ofs.write(outData.c_str(), outData.size());
if (!ofs) throw cybozu::Exception("ms:encode:write") << outData;
}
return true;
}
