VR3zqEcG

1package ammase.com.description;
2
3import android.support.v7.app.AppCompatActivity;
4import android.os.Bundle;
5import android.util.Base64;
6import android.view.View;
7import android.widget.Button;
8import android.widget.EditText;
9import android.widget.TextView;
10
11import java.security.MessageDigest;
12
13import javax.crypto.Cipher;
14import javax.crypto.SecretKey;
15import javax.crypto.spec.SecretKeySpec;
16
17
18public class MainActivity extends AppCompatActivity {
19
20    EditText inputText, passwordTextView;
21    Button onBnt, btn_decrypt;
22    TextView outtext;
23    String outputString;
24    String AES = "AES";
25    
26    @Override
27    protected void onCreate(Bundle savedInstanceState) {
28        super.onCreate(savedInstanceState);
29        setContentView(R.layout.activity_main);
30
31        inputText = (EditText) findViewById(R.id.et_messange);
32        passwordTextView = (EditText) findViewById(R.id.et_password);
33        outtext = (TextView) findViewById(R.id.textView);
34        onBnt = (Button) findViewById(R.id.button);
35        btn_decrypt = (Button) findViewById(R.id.btn_decrypt);
36        
37        onBnt.setOnClickListener(new View.OnClickListener() {
38            @Override
39            public void onClick(View view) {
40                try {
41                    outputString = encrypt (inputText.getText().toString(), passwordTextView.getText().toString());
42                    outtext.setText(outputString);
43                } catch (Exception e) {
44                    e.printStackTrace();
45                }
46            }
47        });
48
49
50        btn_decrypt.setOnClickListener(new View.OnClickListener() {
51            @Override
52            public void onClick(View view) {
53                try {
54                    outputString = decrypt(outputString, passwordTextView.getText().toString());
55                    outtext.setText(outputString);
56                } catch (Exception e) {
57                    e.printStackTrace();
58                }
59
60
61            }
62        });
63    }
64
65    private String decrypt(String outputString, String password) throws Exception {
66        SecretKey key = generateKey(password);
67        Cipher c = Cipher.getInstance(AES);
68        c.init(Cipher.DECRYPT_MODE,key);
69        byte[] decodeValue = Base64.decode(outputString, Base64.DEFAULT);
70        byte[] decValue = c.doFinal(decodeValue);
71        String decrypteValue = new String(decValue);
72        return decrypteValue;
73    }
74
75    private String encrypt(String data, String password) throws Exception {
76        SecretKey key = generateKey(password);
77        Cipher c = Cipher.getInstance(AES);
78        c.init(Cipher.ENCRYPT_MODE,key);
79        byte[] encVal = c.doFinal(data.getBytes());
80        String encrypteValue = Base64.encodeToString(encVal, Base64.DEFAULT);
81        return encrypteValue;
82    }
83
84    private SecretKey generateKey(String password) throws Exception {
85        final MessageDigest digest = MessageDigest.getInstance("SHA-256");
86        byte[] bytes = password.getBytes("UTF-8");
87        digest.update(bytes, 0, bytes.length);
88        byte[]key = digest.digest();
89        SecretKeySpec secretKeySpec = new SecretKeySpec(key, AES);
90        return secretKeySpec;
91    }
92}