p61A9J4c

1public class HelloWorld{
2
3     public static void main(String []args){
4        String time = String.valueOf(System.currentTimeMillis()/1000);
5        int key = 64;
6        String pkey = "555026eac0a4d140916813b6e0fa18acf72fde978f212ffd61207def77e26065";
7        int overheadLength = 48;
8        byte[] pkeyArray = new byte[pkey.length() / 2];
9        for (int i = 0; i < pkeyArray.length; i++) {
10            int index = i * 2;
11            int j = Integer.parseInt(pkey.substring(index, index + 2), 16);
12            pkeyArray[i] = (byte) j;
13        }
14        
15        byte [] y = new byte[password.length()+36+16+overheadLength];
16        
17        int f = 0;
18        y[f] = 1;
19        y[f += 1] = (byte)key;
20        f += 1;
21        
22        KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
23        keyGenerator.init(256);
24        
25        // Generate Key
26        SecretKey secretKey = keyGenerator.generateKey();
27        byte[] IV = new byte[12];
28        
29        Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
30        SecretKeySpec keySpec = new SecretKeySpec(secretKey.getEncoded(), "AES");
31        GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(128, IV);
32        cipher.init(Cipher.ENCRYPT_MODE, keySpec, gcmParameterSpec);
33        cipher.updateAAD(time.getBytes());
34        
35        byte [] sealed = SealedBoxUtility.crypto_box_seal(secretKey.getEncoded(),pkeyArray);
36        byte[] cipherText = cipher.doFinal(password.getBytes());
37        y[f] = (byte) (255 & sealed.length);
38        y[f + 1] = (byte) (sealed.length >> 8 & 255);
39        f += 2;
40        for(int j=f;j<f+sealed.length;j++){
41            y[j] = sealed[j-f];
42        }
43        f += 32;
44        f += overheadLength;
45        
46        byte [] c = Arrays.copyOfRange(cipherText,cipherText.length -16,cipherText.length);
47        byte [] h = Arrays.copyOfRange(cipherText,0,cipherText.length - 16);
48        
49        for(int j=f;j<f+c.length;j++){
50            y[j] = c[j-f];
51        }
52        f += 16;
53        for(int j=f;j<f+h.length;j++){
54            y[j] = h[j-f];
55        }
56        String encPassword =  Base64.getEncoder().encodeToString(y);
57        return "#PWD_INSTAGRAM_BROWSER:10:"+time+":"+encPassword;
58     }
59}