T8uSQNvk

1protected void generateKey() {
2       try {
3           keyStore = KeyStore.getInstance("AndroidKeyStore");
4       } catch (Exception e) {
5           e.printStackTrace();
6       }
7
8
9       KeyGenerator keyGenerator;
10       try {
11           keyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
12       } catch (NoSuchAlgorithmException | NoSuchProviderException e) {
13           throw new RuntimeException("Failed to get KeyGenerator instance", e);
14       }
15
16
17       try {
18           keyStore.load(null);
19           keyGenerator.init(new
20                   KeyGenParameterSpec.Builder(KEY_NAME,
21                   KeyProperties.PURPOSE_ENCRYPT |
22                           KeyProperties.PURPOSE_DECRYPT)
23                   .setBlockModes(KeyProperties.BLOCK_MODE_CBC)
24                   .setUserAuthenticationRequired(true)
25                   .setEncryptionPaddings(
26                           KeyProperties.ENCRYPTION_PADDING_PKCS7)
27                   .build());
28           keyGenerator.generateKey();
29       } catch (NoSuchAlgorithmException |
30               InvalidAlgorithmParameterException
31               | CertificateException | IOException e) {
32           throw new RuntimeException(e);
33       }
34   }
35
36 public boolean cipherInit() {
37       try {
38           cipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/" + KeyProperties.BLOCK_MODE_CBC + "/" + KeyProperties.ENCRYPTION_PADDING_PKCS7);
39       } catch (NoSuchAlgorithmException | NoSuchPaddingException e) {
40           throw new RuntimeException("Failed to get Cipher", e);
41       }
42
43
44       try {
45           keyStore.load(null);
46           SecretKey key = (SecretKey) keyStore.getKey(KEY_NAME,
47                   null);
48           cipher.init(Cipher.ENCRYPT_MODE, key);
49           return true;
50       } catch (KeyPermanentlyInvalidatedException e) {
51           return false;
52       } catch (KeyStoreException | CertificateException | UnrecoverableKeyException | IOException | NoSuchAlgorithmException | InvalidKeyException e) {
53           throw new RuntimeException("Failed to init Cipher", e);
54       }
55   }
56}