import ru.CryptoPro.JCP.JCP;
import java.security.*;
public class CryptoTest1
{
	public static void main(String[] args) throws NoSuchProviderException, NoSuchAlgorithmException, InvalidKeyException, SignatureException
	{
		String data = "test data";
		Security.addProvider(new JCP());
		KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("GOST3410", "JCP");
		KeyPair keyPair = keyPairGenerator.generateKeyPair();
		PrivateKey privateKey = keyPair.getPrivate();
		Signature signature = Signature.getInstance("GOST3411withGOST3410EL", "JCP");
		signature.initSign(privateKey);
		signature.update(data.getBytes());
		byte[] s = signature.sign();
		System.out.println(s.length);
	}
}