KcF7vpL0

1KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
2keyGenerator.init(128, new SecureRandom());
3SecretKey secretKey = keyGenerator.generateKey();
4
5Cipher cipher = Cipher.getInstance("AES");
6
7String plainText = "This is supposed to be encrypted";
8String plainKey = Base64.encodeToString(secretKey.getEncoded(), Base64.DEFAULT);
9
10//encrypt
11cipher.init(Cipher.ENCRYPT_MODE, secretKey);
12byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());
13String encryptedText = Base64.encodeToString(encryptedBytes, Base64.DEFAULT);
14
15//decrypt
16cipher.init(Cipher.DECRYPT_MODE, secretKey);
17byte[]decryptedBytes = cipher.doFinal(encryptedBytes);
18String decryptedText = Base64.encodeToString(decryptedBytes, Base64.DEFAULT);
19	
20SecretKeySpec sks = null;
21    try {
22        SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
23        sr.setSeed("Complex Key for encryption".getBytes());
24        KeyGenerator kg = KeyGenerator.getInstance("AES");
25        kg.init(128, sr);
26        sks = new SecretKeySpec((kg.generateKey()).getEncoded(), "AES");
27    } catch (Exception e) {
28        Log.e(TAG, "AES secret key spec error");
29    }
30
31    // Encode the original data with AES
32    byte[] encodedBytes = null;
33    try {
34        Cipher c = Cipher.getInstance("AES");
35        c.init(Cipher.ENCRYPT_MODE, sks);
36        encodedBytes = c.doFinal(theTestText.getBytes());
37    } catch (Exception e) {
38        Log.e(TAG, "AES encryption error");
39    }
40    TextView tvencoded = (TextView)findViewById(R.id.textitem2);
41    tvencoded.setText("[ENCODED]:n" +
42            Base64.encodeToString(encodedBytes, Base64.DEFAULT) + "n");
43
44    // Decode the encoded data with AES
45    byte[] decodedBytes = null;
46    try {
47        Cipher c = Cipher.getInstance("AES");
48        c.init(Cipher.DECRYPT_MODE, sks);
49        decodedBytes = c.doFinal(encodedBytes);
50    } catch (Exception e) {
51        Log.e(TAG, "AES decryption error");
52    }
53    TextView tvdecoded = (TextView)findViewById(R.id.textitem3);
54    tvdecoded.setText("[DECODED]:n" + new String(decodedBytes) + "n");