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1package javaapplication10;
2
3
4import sun.misc.BASE64Decoder;
5import sun.misc.BASE64Encoder;
6
7import javax.crypto.*;
8import javax.crypto.spec.IvParameterSpec;
9import javax.crypto.spec.SecretKeySpec;
10import java.io.IOException;
11import java.security.InvalidAlgorithmParameterException;
12import java.security.InvalidKeyException;
13import java.security.NoSuchAlgorithmException;
14import java.security.SecureRandom;
15import java.util.Base64;
16import java.util.Base64.Decoder;
17
18import sun.misc.BASE64Encoder;
19import sun.misc.BASE64Decoder;
20
21public class JavaApplication10 {
22    private static String ALGO="AES/CBC/PKCS5Padding";
23	
24	public static String MIC(String a, SecretKey secretKey, IvParameterSpec ivParameterSpec  ) throws Exception
25	{
26        Cipher cipher = Cipher.getInstance("AES/CTR/PKCS5Padding");
27	
28        cipher.init(Cipher.ENCRYPT_MODE,secretKey,ivParameterSpec);
29        String output;
30        output = new BASE64Encoder().encode(cipher.doFinal(a.getBytes()));
31		return output;
32		
33	}
34    public static void main(String[] args) throws Exception, NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, IOException {
35        Cipher cipher = Cipher.getInstance(ALGO);
36        KeyGenerator key = KeyGenerator.getInstance("AES");
37        key.init(128);
38        SecretKey secretKey = key.generateKey();
39        byte[] bs = new byte[16];
40        SecureRandom random = new SecureRandom();
41        random.nextBytes(bs);
42        IvParameterSpec ivParameterSpec = new IvParameterSpec(bs);
43        cipher.init(Cipher.ENCRYPT_MODE,secretKey,ivParameterSpec);
44        String output;
45        output = new BASE64Encoder().encode(cipher.doFinal("BezbednostNaKompjuterskiSistemi".getBytes()));
46        System.out.println(new String(output));
47		
48		// MIC Calculation
49		String tekst = "BezbednostNaKompjuterskiSistemi";
50		String MIC1 = MIC(tekst, secretKey, ivParameterSpec );
51		 System.out.println(MIC1);
52        //Decription
53        cipher.init(Cipher.DECRYPT_MODE,secretKey,ivParameterSpec);
54        byte[] outputDecoder;
55        outputDecoder = outputDecoder = cipher.doFinal(new BASE64Decoder().decodeBuffer(output));
56        System.out.println(new String(outputDecoder));
57		String MIC2 = MIC(new String(outputDecoder), secretKey, ivParameterSpec);
58		 System.out.println(MIC2);
59          /*
60        byte[] encVal = cipher.doFinal("hello".getBytes());
61        String encryptedValue = new BASE64Encoder().encode(encVal);
62        System.out.println(encryptedValue);
63        byte[] decValue = cipher.doFinal(encryptedValue.getBytes());
64        System.out.println(new String(decValue));
65        */
66    }
67}