7pAiFA3N

1package it.blowfish.teti.tetiblowfish;
2
3import android.os.Bundle;
4import android.support.v7.app.AppCompatActivity;
5import android.util.Log;
6
7import java.security.GeneralSecurityException;
8
9import javax.crypto.Cipher;
10import javax.crypto.SecretKey;
11import javax.crypto.spec.SecretKeySpec;
12
13public class MainActivity extends AppCompatActivity {
14
15    private final static String ALGORITM = "Blowfish";
16    private final static String KEY = "12345678";
17    private final static String PLAIN_TEXT = "Antonio";
18
19    @Override
20    protected void onCreate(Bundle savedInstanceState) {
21        super.onCreate(savedInstanceState);
22        setContentView(R.layout.activity_main);
23
24        try {
25
26            byte[] encrypted = encrypt("antonio123456789", PLAIN_TEXT);
27            Log.i("FOO", "Encrypted: " + bytesToHex(encrypted));
28
29            String decrypted = decrypt("antonio123456789", encrypted);
30            Log.i("FOO", "Decrypted: " + decrypted);
31
32        } catch (GeneralSecurityException e) {
33            e.printStackTrace();
34        }
35
36
37
38    }
39
40
41    private byte[] encrypt(String key, String plainText) throws GeneralSecurityException {
42
43        SecretKey secret_key = new SecretKeySpec(key.getBytes(), ALGORITM);
44
45        Cipher cipher = Cipher.getInstance(ALGORITM);
46        cipher.init(Cipher.ENCRYPT_MODE, secret_key);
47
48        return cipher.doFinal(plainText.getBytes());
49    }
50
51    private String decrypt(String key, byte[] encryptedText) throws GeneralSecurityException {
52
53        SecretKey secret_key = new SecretKeySpec(key.getBytes(), ALGORITM);
54
55        Cipher cipher = Cipher.getInstance(ALGORITM);
56        cipher.init(Cipher.DECRYPT_MODE, secret_key);
57
58        byte[] decrypted = cipher.doFinal(encryptedText);
59
60        return new String(decrypted);
61    }
62
63    public static String bytesToHex(byte[] data) {
64
65        if (data == null)
66            return null;
67
68        String str = "";
69
70        for (int i = 0; i < data.length; i++) {
71            if ((data[i] & 0xFF) < 16)
72                str = str + "0" + java.lang.Integer.toHexString(data[i] & 0xFF);
73            else
74                str = str + java.lang.Integer.toHexString(data[i] & 0xFF);
75        }
76
77        return str;
78
79    }
80}