54q3UkNw

1public class RSATest
2   {
3  public static void main(String[] args)
4  {
5  try
6  {
7     if (args[0].equals("-genkey"))
8     {
9        KeyPairGenerator pairgen = KeyPairGenerator.getInstance("RSA");
10        SecureRandom random = new SecureRandom();
11        pairgen.initialize(KEYSIZE, random);
12        KeyPair keyPair = pairgen.generateKeyPair();
13        ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(args[1]));
14        out.writeObject(keyPair.getPublic());
15        out.close();            
16        out = new ObjectOutputStream(new FileOutputStream(args[2]));
17        out.writeObject(keyPair.getPrivate());
18        out.close();            
19     }
20     else if (args[0].equals("-encrypt"))
21     {
22        KeyGenerator keygen = KeyGenerator.getInstance("AES");
23        SecureRandom random = new SecureRandom();
24        keygen.init(random);
25        SecretKey key = keygen.generateKey();
26
27        // wrap with RSA public key
28        ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
29        Key publicKey = (Key) keyIn.readObject();
30        keyIn.close();            
31
32        Cipher cipher = Cipher.getInstance("RSA");
33        cipher.init(Cipher.WRAP_MODE, publicKey);
34        byte[] wrappedKey = cipher.wrap(key);
35        DataOutputStream out = new DataOutputStream(new FileOutputStream(args[2]));
36        out.writeInt(wrappedKey.length);
37        out.write(wrappedKey);
38
39        InputStream in = new FileInputStream(args[1]);
40        cipher = Cipher.getInstance("AES");
41        cipher.init(Cipher.ENCRYPT_MODE, key);
42        crypt(in, out, cipher);
43        in.close();
44        out.close();
45     }
46     else
47     {
48        DataInputStream in = new DataInputStream(new FileInputStream(args[1]));
49        int length = in.readInt();
50        byte[] wrappedKey = new byte[length];
51        in.read(wrappedKey, 0, length);
52
53        // unwrap with RSA private key
54        ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
55        Key privateKey = (Key) keyIn.readObject();
56        keyIn.close();            
57
58        Cipher cipher = Cipher.getInstance("RSA");
59        cipher.init(Cipher.UNWRAP_MODE, privateKey);
60        Key key = cipher.unwrap(wrappedKey, "AES", Cipher.SECRET_KEY);
61
62        OutputStream out = new FileOutputStream(args[2]);
63        cipher = Cipher.getInstance("AES");
64        cipher.init(Cipher.DECRYPT_MODE, key);
65
66        crypt(in, out, cipher);
67        in.close();
68        out.close();
69     }
70  }
71  catch (IOException e)
72  {
73     e.printStackTrace();
74  }
75  catch (GeneralSecurityException e)
76  {
77     e.printStackTrace();
78  }
79  catch (ClassNotFoundException e)
80  {
81     e.printStackTrace();
82  }
83}
84
85 /**
86  Uses a cipher to transform the bytes in an input stream
87  and sends the transformed bytes to an output stream.
88  @param in the input stream
89  @param out the output stream
90  @param cipher the cipher that transforms the bytes
91*/
92 public static void crypt(InputStream in, OutputStream out,
93  Cipher cipher) throws IOException, GeneralSecurityException
94 {
95  int blockSize = cipher.getBlockSize();
96  int outputSize = cipher.getOutputSize(blockSize);
97  byte[] inBytes = new byte[blockSize];
98  byte[] outBytes = new byte[outputSize];
99
100  int inLength = 0;;
101  boolean more = true;
102  while (more)
103  {
104     inLength = in.read(inBytes);
105     if (inLength == blockSize)
106     {
107        int outLength = cipher.update(inBytes, 0, blockSize, outBytes);
108        out.write(outBytes, 0, outLength);
109     }
110     else more = false;         
111  }
112  if (inLength > 0)
113     outBytes = cipher.doFinal(inBytes, 0, inLength);
114  else
115     outBytes = cipher.doFinal();
116  out.write(outBytes);
117   }
118
119  private static final int KEYSIZE = 512;
120  }     
121
122
123
124
125
126         this is my login activity
127
128
129
130
131
132
133
134
135
136
137
138
139public class LoginScreen  extends Activity implements OnClickListener{    
140
141    EditText mobile;
142    EditText pin;
143   Button  btnLogin;
144    Button  btnClear;
145
146    public void onCreate(Bundle icicle)
147  {
148  super.onCreate(icicle);
149  setContentView(R.layout.login.xml);
150
151TextView lblMobileNo = (TextView)findViewById(R.id.lblMobileNo);
152lblMobileNo.setTextColor(getResources().getColor(R.color.text_color_red));
153
154mobile = (EditText)findViewById(R.id.txtMobileNo);
155
156TextView lblPinNo = (TextView)findViewById(R.id.lblPinNo);
157lblPinNo.setTextColor(getResources().getColor(R.color.text_color_red));
158
159 pin = (EditText)findViewById(R.id.txtPinNo);
160
161  btnLogin = (Button)findViewById(R.id.btnLogin);
162 btnClear = (Button)findViewById(R.id.btnClear);
163
164 btnLogin.setOnClickListener(new OnClickListener() {
165     public void onClick(View view) {                
166         postLoginData();
167     }
168     });        
169
170
171 btnClear.setOnClickListener(new OnClickListener()
172  {
173 public void onClick(View v)
174
175 {
176    cleartext();
177 }
178
179      });
180
181      /*  
182
183btnClear.setOnClickListener(new OnClickListener() {
184         public void onClick(View arg0) {
185
186         }
187         }); 
188         */
189
190       }   
191
192    public void postLoginData() 
193
194
195         {
196
197         Intent i = new Intent(this.getApplicationContext(),NEWCLASS.class);
198         Bundle bundle = new Bundle();
199         bundle.putString("mno", mobile.getText().toString());
200         bundle.putString("pinno", pin.getText().toString());
201         i.putExtras(bundle);
202         startActivity(i);          }
203       }
204
205     @Override
206    public void onClick(View v) {
207
208     }  
209
210
211    public void cleartext() {
212
213
214   {
215    pin.setText("") ;
216    mobile.setText("");
217  }
218
219
220   }
221
222
223    }