package tech.loedige;

import th_owl.hs.datensicherheit.util.Dump;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class Main {

    public static void main(String[] args)
            throws Exception {
        byte[] key = Dump.hexString2byteArray("0102030405060708090A0B0C0D0E0F10");
        SecretKey secretKey = new SecretKeySpec(key, "AES");
        Cipher cipher= Cipher.getInstance("AES/CTR/NOPADDING");
        byte[] ctr = Dump.hexString2byteArray("FFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFE");
        IvParameterSpec iv = new IvParameterSpec(ctr);
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
        byte[] m = new byte[35];
        byte[] c = cipher.doFinal(m);
        System.out.println("AES-CTR-Verschlüsselung mit "+
                "Cipher-Instanz vom Typ AES/CTR/NOPADDING:");
        System.out.println(Dump.dump(c));
        System.out.println();
        KeyStreamGenerator_AES_CTR ksg= new KeyStreamGenerator_AES_CTR();
        ksg.initState(key, ctr);
        AdditiveStreamCipher.encrypt(ksg, m);
        System.out.println("AES-CTR-Verschlüsselung mit "+ "KeyStreamGenerator_AES_CTR-Implementierung:");
        System.out.println(Dump.dump(m));
        System.out.println();
    }
}