tNBK7ijG

1import javax.crypto.KeyGenerator;
2import javax.crypto.SecretKey;
3import javax.crypto.Cipher;
4import sun.misc.BASE64Encoder;
5import sun.misc.BASE64Decoder;
6import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
7import javax.crypto.spec.SecretKeySpec;
8 
9public class AesEncrDec
10{
11	public static void main(String args[])
12	{
13		String plainData="hello",cipherText,decryptedText;
14		
15		try
16		{
17				/* Key Generation */
18						
19			KeyGenerator keyGen = KeyGenerator.getInstance("AES");
20			keyGen.init(128);
21			SecretKey secretKey =keyGen.generateKey();
22			System.out.println("Secret Key is "+secretKey);
23			
24			
25				/* Performing Encryption */
26				
27			Cipher aesCipher = Cipher.getInstance("AES");
28			aesCipher.init(Cipher.ENCRYPT_MODE,secretKey);
29			byte[] byteDataToEncrypt = plainData.getBytes();
30			byte[] byteCipherText = aesCipher.doFinal(byteDataToEncrypt);		
31			cipherText = new BASE64Encoder().encode(byteCipherText);
32			
33			String stringKey=Base64.encode(secretKey.getEncoded());			//for send key to other party....						
34				
35				
36				/* Other party gets originalKey from stringKey */
37				
38			byte[] encodedKey     = Base64.decode(stringKey);
39			SecretKey originalKey = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
40			System.out.println("Original Key is "+originalKey);
41			
42			
43				/* Performing Decryption */
44			
45			byte[] byteChipherText=new BASE64Decoder().decodeBuffer(cipherText);
46			Cipher aesCipher1 = Cipher.getInstance("AES");
47			aesCipher1.init(Cipher.DECRYPT_MODE,originalKey,aesCipher1.getParameters());
48			byte[] byteDecryptedText = aesCipher1.doFinal(byteChipherText);
49			decryptedText = new String(byteDecryptedText);
50			
51			System.out.println("\n Plain Data : "+plainData+" \n Cipher Data : "+cipherText+" \n Decrypted Data : "+decryptedText);
52		}
53		catch(Exception e)
54		{
55			 e.printStackTrace();
56		}
57	}	
58}