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1public SecretKeySpec createKey(String key) throws UnsupportedEncodingException, NoSuchAlgorithmException, InvalidKeySpecException {
2        SecureRandom random = new SecureRandom();
3        byte[] sr = new byte[16];
4        random.nextBytes(sr);
5
6        KeySpec spec = new PBEKeySpec(key.toCharArray(), sr, 65536, 256); // AES-256
7        SecretKeyFactory f = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
8        byte[] key_bytes = f.generateSecret(spec).getEncoded();
9        SecretKeySpec keySpec = new SecretKeySpec(key_bytes, "AES");
10
11        return keySpec;
12    }
13
14    public String encrypt(String data, SecretKeySpec secret_key) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
15        Cipher cipher = Cipher.getInstance("AES");
16        cipher.init(Cipher.ENCRYPT_MODE, secret_key);
17
18        byte[] encrypt_data = data.getBytes("UTF-8");
19        byte[] encrypted_data = cipher.doFinal(encrypt_data);
20        String encrypted_string = Base64.getEncoder().encodeToString(encrypted_data);
21
22        return encrypted_string;
23    }
24
25    public String encryptRSAwithAES(PrivateKey data, SecretKeySpec secret_key) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
26        Cipher cipher = Cipher.getInstance("AES");
27        cipher.init(Cipher.ENCRYPT_MODE, secret_key);
28
29        byte[] encrypt_data = data.getEncoded();
30        byte[] encrypted_data = cipher.doFinal(encrypt_data);
31        String encrypted_string = Base64.getEncoder().encodeToString(encrypted_data);
32
33        return encrypted_string;
34    }
35
36    public String decrypt(String encrypted_string, byte[] decoded_key) throws UnsupportedEncodingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
37        SecretKeySpec secret_key = new SecretKeySpec(decoded_key, 0, decoded_key.length, "AES");
38        Cipher cipher = Cipher.getInstance("AES");
39        cipher.init(Cipher.DECRYPT_MODE, secret_key);
40
41        byte[] encrypted_data = Base64.getDecoder().decode(encrypted_string);
42        byte[] decrypted_data = cipher.doFinal(encrypted_data);
43
44        String data = new String(decrypted_data);
45
46        return data;
47    }
48
49    public KeyPair generateRSAPair() throws NoSuchAlgorithmException {
50        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
51        KeyPair kp = kpg.generateKeyPair();
52
53        return kp;
54    }
55
56    public String encryptKey(SecretKeySpec aes_key, PrivateKey rsa_private) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
57        byte[] encrypted_bytes;
58        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
59        cipher.init(Cipher.ENCRYPT_MODE, rsa_private);
60
61        encrypted_bytes = cipher.doFinal(aes_key.getEncoded());
62
63        String b_bytes = Base64.getEncoder().encodeToString(encrypted_bytes);
64
65        return b_bytes;
66    }
67
68    public byte[] decryptKey(String aes_key, String rsa_private) throws InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, BadPaddingException, IllegalBlockSizeException, InvalidKeySpecException {
69        byte[] encrypted_bytes;
70        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(Base64.getDecoder().decode(rsa_private));
71        Cipher cipher = Cipher.getInstance("RSA");
72        PrivateKey pk = KeyFactory.getInstance("RSA").generatePrivate(keySpec);
73
74        cipher.init(Cipher.DECRYPT_MODE, pk);
75        byte[] dec_key = cipher.doFinal(aes_key.getBytes());
76
77        return dec_key;
78    }