dHxR0DGi

1import java.io.*;
2import java.util.*;
3import javax.crypto.*;
4
5public class AES
6{
7	Cipher ecipher,dcipher;
8	public AES(SecretKey key)
9	{
10		try
11		{
12			ecipher=Cipher.getInstance("AES");
13			ecipher.init(Cipher.ENCRYPT_MODE,key);
14			dcipher=Cipher.getInstance("AES");
15			dcipher.init(Cipher.DECRYPT_MODE,key);			
16		}
17		catch(Exception e)
18		{
19			System.out.println("Exception occur:"+e);
20		}
21	}
22	public String encrypt(String str)
23	{
24		try
25		{
26			byte[] utf8=str.getBytes("UTF8");
27			byte[] enc=ecipher.doFinal(utf8);
28			return new sun.misc.BASE64Encoder().encode(enc);		
29		}
30		catch(Exception e)
31		{
32			System.out.println("Exception occur:"+e);
33		}
34		return null;
35	}
36	public String decrypt(String str)
37	{
38		try
39		{
40			byte[] dec=new sun.misc.BASE64Decoder().decodeBuffer(str);
41			byte[] utf8=dcipher.doFinal(dec);
42			return new String(utf8,"UTF8");
43		}
44		catch(Exception e)
45		{
46			System.out.println("Exception occur:"+e);
47		}
48		return null;
49	}
50	public static void main(String args[])
51	{
52		try
53		{
54			System.out.println("\n\t=========AES================\n");
55			SecretKey key=KeyGenerator.getInstance("AES").generateKey();
56			AES aes=new AES(key);
57
58			
59			System.out.print("\tEnter the string to encrypted:");
60			Scanner sc=new Scanner(System.in);
61			String input=sc.nextLine();
62			String encrypt=aes.encrypt(input);
63			String decrypt=aes.decrypt(encrypt);
64			
65			System.out.println("\n\tOriginal string is:"+input);
66			System.out.println("\tEncrypted string is : "+encrypt);
67			System.out.println("\tDecrypted String is : "+decrypt);
68		}
69		catch(Exception e)
70		{
71			System.out.println("Exception occur:"+e);
72		}
73	}
74}