2dn8vp2y

1import javax.crypto.Cipher;
2import javax.crypto.spec.SecretKeySpec;
3import javax.xml.bind.DatatypeConverter;
4
5public class ECBTest {
6    public static void main(String[] args) throws Exception {
7        byte[] plain = "jakistamsupertekstdoszyfruszyfru".getBytes();
8        byte[] key = "supersekretnykey".getBytes();
9
10        SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
11        Cipher cipher = Cipher.getInstance("AES/ECB/NoPadding");
12
13        // szyfrowanie
14        cipher.init(Cipher.ENCRYPT_MODE, secretKey);
15        byte[] encrypted = cipher.doFinal(plain);
16        String enc = DatatypeConverter.printHexBinary(encrypted);
17        System.out.printf("Encrypted: 0x%s\n", enc);
18        System.out.println();
19        
20        // deszyfrowanie
21        cipher.init(Cipher.DECRYPT_MODE, secretKey);
22        byte[] decrypted = cipher.doFinal(encrypted);
23
24         String decodedString = new String(decrypted, "UTF-8");
25         System.out.printf("Decrypted : %s\n", decodedString);
26    }
27}