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Encryption and Decryption of Data using AES-128 algorithm in Java

Posted by on Feb 25, 2013 in Java | 14 comments

 
Encryption and Decryption
 
Encryption and Decryption of Data using AES-128 algorithm in Java
 

package com.simplecode.action;

import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import sun.misc.*;

public class AES 
{
private static String algorithm = "AES";
private static byte[] keyValue=new byte[] 
{ 'A', 'S', 'e', 'c', 'u', 'r', 'e', 'S', 'e', 'c', 'r', 'e', 't', 'K', 'e', 'y' };

        // Performs Encryption
        public static String encrypt(String plainText) throws Exception 
        {
                Key key = generateKey();
                Cipher chiper = Cipher.getInstance(algorithm);
                chiper.init(Cipher.ENCRYPT_MODE, key);
                byte[] encVal = chiper.doFinal(plainText.getBytes());
                String encryptedValue = new BASE64Encoder().encode(encVal);
                return encryptedValue;
        }

        // Performs decryption
        public static String decrypt(String encryptedText) throws Exception 
        {
                // generate key 
                Key key = generateKey();
                Cipher chiper = Cipher.getInstance(algorithm);
                chiper.init(Cipher.DECRYPT_MODE, key);
                byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedText);
                byte[] decValue = chiper.doFinal(decordedValue);
                String decryptedValue = new String(decValue);
                return decryptedValue;
        }

//generateKey() is used to generate a secret key for AES algorithm
        private static Key generateKey() throws Exception 
        {
                Key key = new SecretKeySpec(keyValue, algorithm);
                return key;
        }

        // performs encryption & decryption 
        public static void main(String[] args) throws Exception 
        {

                String plainText = "Password";
                String encryptedText = AES.encrypt(plainText);
                String decryptedText = AES.decrypt(encryptedText);

                System.out.println("Plain Text : " + plainText);
                System.out.println("Encrypted Text : " + encryptedText);
                System.out.println("Decrypted Text : " + decryptedText);
        }
}

 

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