bZnfvsR1

1import javax.crypto.KeyGenerator;
2import javax.crypto.SecretKey;
3import java.math.BigInteger;
4import java.security.SecureRandom;
5import java.util.Random;
6
7public class Symkey {
8
9    public static byte[] generateSymmetricKey() throws Exception
10    {
11
12        Random r = new Random();
13        int num = r.nextInt(10000);
14        String knum = String.valueOf(num);
15        byte[] knumb = knum.getBytes();
16        byte[] skey=getRawKey(knumb);
17
18        //  String skeyString = new String(skey);
19
20        //System.out.println("Blowfish Symmetric key = "+skey);
21        return skey;
22
23    }
24
25    private static byte[] getRawKey(byte[] seed) throws Exception {
26
27        KeyGenerator kgen = KeyGenerator.getInstance("Blowfish");
28
29        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
30
31        sr.setSeed(seed);
32
33        kgen.init(128, sr); // 128, 256 and 448 bits may not be available
34
35        SecretKey skey = kgen.generateKey();
36
37        byte[] raw = skey.getEncoded();
38
39        return raw;
40
41    }
42
43
44    public static void main(String args[]) throws Exception {
45
46        byte[] array = generateSymmetricKey();
47
48        System.out.println(array);
49
50        BigInteger bigInt = new BigInteger(array);
51
52// shift
53        BigInteger shiftInt = bigInt.shiftRight(4);
54
55// back to array
56        byte [] shifted = shiftInt.toByteArray();
57
58        byte[] og = shiftInt.shiftLeft(4).toByteArray();
59
60        
61        System.out.println(og);
62    }
63
64
65}