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1package id.comrade.utility;
2
3/**
4 * Created by user on 12/16/2016.
5 */
6import android.util.Base64;
7
8import java.io.UnsupportedEncodingException;
9import java.security.MessageDigest;
10import java.security.NoSuchAlgorithmException;
11import java.util.Arrays;
12import java.util.Random;
13
14import javax.crypto.Cipher;
15import javax.crypto.spec.SecretKeySpec;
16
17
18public class AESEncrypt {
19
20    private static SecretKeySpec secretKey;
21    private static byte[] key;
22
23    public static void setKey(String myKey)
24    {
25        MessageDigest sha = null;
26        try {
27            key = myKey.getBytes("UTF-8");
28            sha = MessageDigest.getInstance("SHA-1");
29            key = sha.digest(key);
30            key = Arrays.copyOf(key, 16);
31            secretKey = new SecretKeySpec(key, "AES");
32        }
33        catch (NoSuchAlgorithmException e) {
34            e.printStackTrace();
35        }
36        catch (UnsupportedEncodingException e) {
37            e.printStackTrace();
38        }
39    }
40
41    public static String encrypt(String strToEncrypt, String secret)
42    {
43        try
44        {
45            setKey(secret);
46            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
47            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
48            return Base64.encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")),Base64.DEFAULT);
49        }
50        catch (Exception e)
51        {
52            System.out.println("Error while encrypting: " + e.toString());
53        }
54        return null;
55    }
56
57    public static String decrypt(String strToDecrypt, String secret)
58    {
59        try
60        {
61            setKey(secret);
62            Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
63            cipher.init(Cipher.DECRYPT_MODE, secretKey);
64            byte[] hasil = Base64.decode(strToDecrypt,Base64.DEFAULT);
65            return new String(cipher.doFinal(hasil),"UTF-8");
66        }
67        catch (Exception e)
68        {
69            System.out.println("Error while decrypting: " + e.toString());
70        }
71        return null;
72    }
73
74    public static String randomKey() {
75        String SALTCHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
76        StringBuilder salt = new StringBuilder();
77        Random rnd = new Random();
78        while (salt.length() < 12) {
79            int index = (int) (rnd.nextFloat() * SALTCHARS.length());
80            salt.append(SALTCHARS.charAt(index));
81        }
82        String saltStr = salt.toString();
83        return saltStr;
84
85    }
86}