Des Encrypter : DES « Security « Java

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Java » Security » DES 




Des Encrypter
  
/*******************************************************************************
 * Copyright (c) 2004 BlueOxygen Technology.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the BlueOxygen Software License v1.0
 * which accompanies this distribution, and is available at
 *
 * Contributors:
 *     BlueOxygen Team - initial API and implementation
 *******************************************************************************/


import java.io.UnsupportedEncodingException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.KeySpec;

import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.PBEParameterSpec;

/**
 @author ginanjar
 *
 * To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
public class DesEncrypter {
  Cipher ecipher;
    Cipher dcipher;

    // 8-byte Salt
    byte[] salt = {
        (byte)0xA9(byte)0x9B(byte)0xC8(byte)0x32,
        (byte)0x56(byte)0x35(byte)0xE3(byte)0x03
    };

    // Iteration count
    int iterationCount = 19;
    public static final DesEncrypter NAGASAKTI = new DesEncrypter("NagaSakti");
    
    private DesEncrypter(String passPhrase) {
        try {
            // Create the key
            KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
            SecretKey key = SecretKeyFactory.getInstance(
                "PBEWithMD5AndDES").generateSecret(keySpec);
            ecipher = Cipher.getInstance(key.getAlgorithm());
            dcipher = Cipher.getInstance(key.getAlgorithm());

            // Prepare the parameter to the ciphers
            AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);

            // Create the ciphers
            ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
            dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
        catch (java.security.InvalidAlgorithmParameterException e) {
        catch (java.security.spec.InvalidKeySpecException e) {
        catch (javax.crypto.NoSuchPaddingException e) {
        catch (java.security.NoSuchAlgorithmException e) {
        catch (java.security.InvalidKeyException e) {
        }
    }

    public String encrypt(String str) {
        try {
            // Encode the string into bytes using utf-8
            byte[] utf8 = str.getBytes("UTF8");

            // Encrypt
            byte[] enc = ecipher.doFinal(utf8);

            // Encode bytes to base64 to get a string
            return new sun.misc.BASE64Encoder().encode(enc);
        catch (javax.crypto.BadPaddingException e) {
        catch (IllegalBlockSizeException e) {
        catch (UnsupportedEncodingException e) {
        }
        return null;
    }

    public String decrypt(String str) {
        try {
            // Decode base64 to get bytes
            byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);

            // Decrypt
            byte[] utf8 = dcipher.doFinal(dec);

            // Decode using utf-8
            return new String(utf8, "UTF8");
        catch (javax.crypto.BadPaddingException e) {
        catch (IllegalBlockSizeException e) {
        catch (UnsupportedEncodingException e) {
        catch (java.io.IOException e) {
        }
        return null;
    }
    
    public static void main(String args[]){
      String encrypted = DesEncrypter.NAGASAKTI.encrypt("bismillah");
      
      System.out.println(encrypted);
      String decrypted = DesEncrypter.NAGASAKTI.decrypt("eYLD6UnwrQE=");
      System.out.println(decrypted);
    }
}

   
    
  














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8.Encrypting with DES Using a Pass Phrase
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