Bupij8pC

1public class KeyChainUtils {
2    private static KeyChainUtils instance;
3    private KeyStore keyStore;
4    public SecretKey key;
5    private static Object mutex=new Object();
6
7    public static KeyChainUtils getInstance() {
8        if(instance==null){
9            synchronized (mutex) {
10                instance = new KeyChainUtils();
11            }
12        }
13        return instance;
14    }
15
16    private KeyChainUtils(){
17        init();
18    }
19
20
21    public  void init(){
22        try{
23            // Get Keystore
24            keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
25            SharedPreferences keyPreference = PreferenceManager.getDefaultSharedPreferences(MyApplication.getApplication());
26            boolean isFirstRun = keyPreference.getBoolean("FIRSTRUN", true);
27            if (isFirstRun)
28            {
29                SharedPreferences.Editor editor = keyPreference.edit();
30                editor.putBoolean("FIRSTRUN", false);
31                editor.commit();
32                keyStore.load(null, getPass());
33                generateKey();
34                Log.e("Key","created");
35            } else {
36                getKey();
37                Log.e("Key","Already created");
38            }
39        }
40        catch(Exception ex){
41            ex.printStackTrace();
42        }
43    }
44
45
46    void generateKey(){
47        try {
48            // Get and Convert the Key
49            key = KeyGenerator.getInstance("AES").generateKey();
50            saveKey();
51        }
52        catch(Exception ex){
53            ex.printStackTrace();
54        }
55    }
56
57    void saveKey(){
58        try{
59            // Save my secret key
60            KeyStore.SecretKeyEntry secretKeyEntry = new KeyStore.SecretKeyEntry(key);
61            keyStore.setEntry("ECAlias", secretKeyEntry,null);
62            // Save the keystore
63            FileOutputStream fos = new FileOutputStream(MyApplication.getApplication().getFilesDir().getAbsolutePath() + "/ECK");
64            keyStore.store(fos, getPass());
65        }
66        catch(Exception ex){
67            ex.printStackTrace();
68        }
69    }
70
71    public SecretKey  getKey(){
72        try{
73            if(key==null) {
74                // Load Keystore
75                FileInputStream fis = new FileInputStream(MyApplication.getApplication().getFilesDir().getAbsolutePath() + "/ECK");
76                keyStore.load(fis, getPass());
77                // Load the secret key
78                KeyStore.SecretKeyEntry secretKeyEntry = (KeyStore.SecretKeyEntry) keyStore.getEntry("ECAlias", null);
79                key = secretKeyEntry.getSecretKey();
80            }
81        }
82        catch(Exception ex){
83            ex.printStackTrace();
84            MyApplication.getApplication().logOutOnSessionTimeOut();
85        }
86        return key;
87    }
88
89    private char[] getPass() {
90        SharedPreferences keyPreference = PreferenceManager.getDefaultSharedPreferences(MyApplication.getApplication());
91        String keyPass=keyPreference.getString("keyPassEC","");
92        if(TextUtils.isEmpty(keyPass)){
93            String digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
94            SecureRandom rnd = new SecureRandom();
95            StringBuilder sb = new StringBuilder(16);
96            for (int i = 0; i < 16; i++)
97                sb.append(digits.charAt(rnd.nextInt(digits.length())));
98            keyPass=sb.toString();
99            keyPreference.edit().putString("keyPassEC",keyPass).apply();
100        }
101        return keyPass.toCharArray();
102    }