SBj6FCtG

1import java.awt.Container;
2import java.security.InvalidAlgorithmParameterException;
3import java.security.InvalidKeyException;
4import java.security.NoSuchAlgorithmException;
5import java.security.SecureRandom;
6import java.util.Base64;
7
8import javax.crypto.BadPaddingException;
9import javax.crypto.Cipher;
10import javax.crypto.IllegalBlockSizeException;
11import javax.crypto.KeyGenerator;
12import javax.crypto.NoSuchPaddingException;
13import javax.crypto.SecretKey;
14import javax.crypto.spec.IvParameterSpec;
15import java.awt.Dimension;
16import java.awt.EventQueue;
17import java.awt.Toolkit;
18
19import javax.swing.GroupLayout;
20import javax.swing.JComponent;
21import javax.swing.JFrame;
22import javax.swing.JLabel;
23import javax.swing.JPanel;
24import javax.swing.JTabbedPane;
25import java.util.Scanner;
26		
27		public class AES256 extends JFrame{
28			
29		/**
30			 * 
31			 */
32			private static final long serialVersionUID = 1L;
33		private SecretKey aeskey = null;	
34		String s = null;
35		String d = null;
36		String plaintext = null;
37		
38		public AES256() throws NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, NoSuchPaddingException, InvalidAlgorithmParameterException, IllegalBlockSizeException {
39			Scanner scan = new Scanner(System.in);
40			System.out.print("What information would you like to encrypt with AES 256 in CBC mode: ");
41			String plaintext = scan.nextLine()
42					+ "";
43			KeyGenerator keygen = KeyGenerator.getInstance("AES") ; // Specifying algorithm key will be used for 
44	        keygen.init(128);
45	        aeskey = keygen.generateKey() ;
46	        
47	        byte[] encrypted = encrypt(plaintext, aeskey);
48	        String decrypted = decrypt(encrypted, aeskey);
49	        s= (Base64.getEncoder().encodeToString(encrypted));
50	        d = decrypted;
51	        System.out.println("The encrypted text: " + Base64.getEncoder().encodeToString(encrypted));
52	        System.out.println("The decrypted text: " + decrypted);
53	        
54	        initUI();
55	        this.setTitle("AES256 Encryption");
56	        //this.setSize(1920,1080);
57	        Dimension DimMax = Toolkit.getDefaultToolkit().getScreenSize();
58	        this.setMaximumSize(DimMax);
59
60	        this.setExtendedState(JFrame.MAXIMIZED_BOTH);
61		}
62
63        // Generating Key  
64	
65        public static byte[] encrypt(String plaintext, SecretKey aeskey) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException{
66        	byte[] plainbytes = plaintext.getBytes();
67
68	        // Generating IV.
69	        int ivSize = 16;
70	        byte[] iv = new byte[ivSize];
71	        SecureRandom random = new SecureRandom();
72	        random.nextBytes(iv);
73	        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
74	        
75	        // Encrypt.
76	        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
77	        cipher.init(Cipher.ENCRYPT_MODE, aeskey, ivParameterSpec);
78	        byte[] encrypted = cipher.doFinal(plainbytes);
79
80	        // Combine IV and encrypted part.
81	        byte[] encryptedIVAndText = new byte[ivSize + encrypted.length];
82	        System.arraycopy(iv, 0, encryptedIVAndText, 0, ivSize);
83	        System.arraycopy(encrypted, 0, encryptedIVAndText, ivSize, encrypted.length);
84
85	        return encryptedIVAndText;
86	    }
87
88	    public static String decrypt(byte[] encryptedIvTextBytes, SecretKey aeskey) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException{
89	        int ivSize = 16;
90
91	        // Extract IV.
92	        byte[] iv = new byte[ivSize];
93	        System.arraycopy(encryptedIvTextBytes, 0, iv, 0, iv.length);
94	        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
95
96	        // Extract encrypted part.
97	        int encryptedSize = encryptedIvTextBytes.length - ivSize;
98	        byte[] encryptedBytes = new byte[encryptedSize];
99	        System.arraycopy(encryptedIvTextBytes, ivSize, encryptedBytes, 0, encryptedSize);
100
101	        // Decrypt.
102	        Cipher cipherDecrypt = Cipher.getInstance("AES/CBC/PKCS5Padding");
103	        cipherDecrypt.init(Cipher.DECRYPT_MODE, aeskey, ivParameterSpec);
104	        byte[] decrypted = cipherDecrypt.doFinal(encryptedBytes);
105
106	        return new String(decrypted);
107	    }
108	    private void initUI() {
109	    	JTabbedPane tbp = new JTabbedPane();
110	        tbp.addTab("Encrypted AES256", createPanel(s));
111	        tbp.addTab("Decrypted AES256", createPanel(d));
112	        
113	        createLayout(tbp);
114
115	        setTitle("JTabbedPane");
116	        setLocationRelativeTo(null);
117	        setDefaultCloseOperation(EXIT_ON_CLOSE);
118	    }
119	    
120	    public JPanel createPanel(String text) {
121	        
122	        JPanel panel = new JPanel();
123	        JLabel lbl = new JLabel(text);
124	        panel.add(lbl);
125	        
126	        return panel;
127	    }
128	    private void createLayout(JComponent... arg) {
129	        
130	        Container pane = getContentPane();
131	        GroupLayout gl = new GroupLayout(pane);
132	        pane.setLayout(gl);        
133	        
134	        gl.setAutoCreateContainerGaps(true);
135	        gl.setAutoCreateGaps(true);        
136
137	        gl.setHorizontalGroup(gl.createSequentialGroup()
138	                .addComponent(arg[0])
139	        );
140
141	        gl.setVerticalGroup(gl.createParallelGroup()
142	                .addComponent(arg[0])
143	        );
144
145	        //pack();
146	    }    
147}