B28UmARE

1public void encryptdata(byte[] data) {
2    Encrypter encrypter = new Encrypter(); 
3    HashGenerator hashGenerator = new HashGenerator();
4    try {
5        byte[] e = encrypter.generateSessionKey();
6        byte[] encryptedData = encrypter.encryptUsingSessionKey(e, data);
7        byte[] hmac = hashGenerator.generateSha256Hash(data);
8        byte[] encryptedHmacBytes = encrypter.encryptUsingSessionKey(e, hmac);
9        this.encodedSessionKey = encodeBase64(e);
10        this.encodedHmac = encodeBase64(encryptedHmacBytes);
11        this.encodedData = encodeBase64(encryptedData);
12        } catch (Exception var6) {
13        var6.printStackTrace();
14        throw new RuntimeException(var6);
15    }
16}
17	
18class Encrypter {
19private static final String JCE_PROVIDER = "BC";
20private static final int SYMMETRIC_KEY_SIZE = 256;
21
22Encrypter() {
23}
24
25public byte[] generateSessionKey() throws NoSuchAlgorithmException, NoSuchProviderException {
26    KeyGenerator kgen = KeyGenerator.getInstance("AES", "BC");
27    kgen.init(256);
28    SecretKey key = kgen.generateKey();
29    byte[] symmKey = key.getEncoded();
30    return symmKey;
31}
32
33public byte[] encryptUsingSessionKey(byte[] skey, byte[] data) throws InvalidCipherTextException {
34    PaddedBufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new AESEngine(), new PKCS7Padding());
35    cipher.init(true, new KeyParameter(skey));
36    int outputSize = cipher.getOutputSize(data.length);
37    byte[] tempOP = new byte[outputSize];
38    int processLen = cipher.processBytes(data, 0, data.length, tempOP, 0);
39    int outputLen = cipher.doFinal(tempOP, processLen);
40    byte[] result = new byte[processLen + outputLen];
41    System.arraycopy(tempOP, 0, result, 0, result.length);
42    return result;
43}
44
45static {
46    Security.addProvider(new BouncyCastleProvider());
47}
48	
49class HashGenerator {
50public HashGenerator() {
51}
52
53public byte[] generateSha256Hash(byte[] message) {
54    String var2 = "SHA-256";
55    String var3 = "BC";
56    byte[] var4 = null;
57
58    try {
59        MessageDigest var7 = MessageDigest.getInstance(var2, var3);
60        var7.reset();
61        var4 = var7.digest(message);
62    } catch (Exception var6) {
63        var6.printStackTrace();
64    }
65
66    return var4;
67}