Example #1
0
void LoadKey(const char* file, RSA::PrivateKey& key)
{
    ByteQueue q;
    FileSource KeyFile(file, true, new Base64Decoder());
    KeyFile.TransferTo(q);
    key.BERDecodePrivateKey(q,false,0); // last 2 params unused
}
Example #2
0
static bool DecodeFromFile(const char* filename, RSA::PrivateKey& key)
{
	try {
		ByteQueue queue;
		FileSource file(filename, true);
		file.TransferTo(queue);
		queue.MessageEnd();
		key.BERDecodePrivateKey(queue, false, queue.MaxRetrievable());
		return key.Validate(rng, 3);
	} catch (...) {
		return false;
	}
}
extern "C" int rsa_pss_sign(const char *key_file, const unsigned char *msg,
			int len, unsigned char *sig_buf, unsigned char *modulus_buf)
{
	try {
		AutoSeededRandomPool rng;
		FileSource file(key_file, true);
		RSA::PrivateKey key;
		ByteQueue bq;

		// Load the key
		file.TransferTo(bq);
		bq.MessageEnd();
		key.BERDecodePrivateKey(bq, false, bq.MaxRetrievable());

		// Write the modulus
		Integer mod = key.GetModulus();
		// error check
		if (mod.ByteCount() != RCM_RSA_MODULUS_SIZE)
			throw std::length_error("incorrect rsa key modulus length");
		for (int i = 0; i < mod.ByteCount(); i++)
			modulus_buf[i] = mod.GetByte(i);

		// Sign the message
		RSASS<PSS, SHA256>::Signer signer(key);
		size_t length = signer.MaxSignatureLength();
		SecByteBlock signature(length);

		length = signer.SignMessage(rng, msg, len, signature);

		// Copy in reverse order
		for (int i = 0; i < length; i++)
			sig_buf[length - i - 1] = signature[i];
	}
	catch(const CryptoPP::Exception& e) {
		cerr << e.what() << endl;
		return 1;
	}
	catch(std::length_error& le) {
		cerr << "Error: " << le.what() << endl;
		return 1;
	}

	return 0;
}
extern "C" int rsa_pss_sign_file(const char *key_file, const char *msg_file,
			unsigned char *sig_buf)
{
	try {
		AutoSeededRandomPool rng;
		FileSource file(key_file, true);
		RSA::PrivateKey key;
		ByteQueue bq;

		// Load the key
		file.TransferTo(bq);
		bq.MessageEnd();
		key.BERDecodePrivateKey(bq, false, bq.MaxRetrievable());

		// Sign the message
		RSASS<PSS, SHA256>::Signer signer(key);
		string signature;
		FileSource src(msg_file, true,
			new SignerFilter(rng, signer,
					new StringSink(signature)));
		int length = signature.length();
		// error check
		if (length != RCM_RSA_SIG_SIZE)
			throw std::length_error("incorrect rsa key length");

		// Copy in reverse order
		for (int i = 0; i < length; i++)
			sig_buf[length - i - 1] = signature[i];
	}
	catch(const CryptoPP::Exception& e) {
		cerr << e.what() << endl;
		return 1;
	}
	catch(std::length_error& le) {
		cerr << "Error: " << le.what() << endl;
		return 1;
	}

	return 0;
}