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1package knjigazis;
2import java.io.UnsupportedEncodingException;
3import java.security.InvalidKeyException;
4import java.security.NoSuchAlgorithmException;
5import javax.crypto.BadPaddingException;
6import javax.crypto.Cipher;
7import javax.crypto.IllegalBlockSizeException;
8import javax.crypto.KeyGenerator;
9import javax.crypto.NoSuchPaddingException;
10import javax.crypto.SecretKey;
11import javax.crypto.spec.SecretKeySpec;
12
13public class AESsifra {
14    public static void main(String[] args) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, UnsupportedEncodingException, IllegalBlockSizeException, BadPaddingException {
15        //Generisanje ključa
16        KeyGenerator kg = KeyGenerator.getInstance("AES");        
17        SecretKey kljuc = kg.generateKey();        
18        byte[] AESkljuc = kljuc.getEncoded();        
19        SecretKeySpec specifikacijaKljuca = new SecretKeySpec(AESkljuc, "AES"); 
20        //Inicijalizovanje šifre
21        Cipher sifra = Cipher.getInstance("AES/CBC/PKCS5Padding");        
22        sifra.init(Cipher.ENCRYPT_MODE, specifikacijaKljuca);        
23        //Poruka za šifrovanje
24        String poruka = "UNIVERZITET SINGIDUNUM 2020.";        
25        //Šifrovanje poruke
26        byte sifrat[] = sifra.doFinal(poruka.getBytes("UTF-8"));        
27        
28        System.out.println("Algoritam kljuca: "+kljuc.getAlgorithm());
29        System.out.println("Veličina ključa: "+kljuc.getEncoded().length*8);
30        System.out.println("Veličina bloka: "+sifra.getBlockSize());
31        System.out.println("Šifarski algoritam: "+sifra.getAlgorithm());
32        System.out.println("Provajder: "+sifra.getProvider());
33        System.out.println("IV: "+new String(sifra.getIV()));
34        System.out.println("Poruka: "+poruka);
35        System.out.println("Sifrat: "+new String(sifrat));       
36    }
37}