DES加密+Base64轉換轉實現代碼

首先，對用戶輸入的password進行MD5轉換，然后，對用戶輸入的Data進行des加密，最后進行base64轉換為密文； 解密，對用戶輸入的password進行MD5轉換，然后，對用戶輸入的Data進行base64解密，最后進行des解密為明文； 現在提供這樣一個幫助類，進行類似操作！

package httpVisit.action;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/**

@author：Heweipo
@version 1.00
*/
public class DesCoderUtil {
private static byte[] keys = { 1, -1, 1, -1, 1, -1, 1, -1 };
private static String key = "leagsoft";
public static String getKey() {

 return key;

}
public static void setKey(String key) {

 DesCoderUtil.key = key;

}
/**


<p>
對password進行MD5加密
@param source
@return 
@return byte[]    
author: Heweipo
*/
public static byte[] getMD5(byte[] source) {
 byte tmp[] = null;
 try {

 java.security.MessageDigest md = java.security.MessageDigest
         .getInstance("MD5");
 md.update(source);
 tmp = md.digest();

} catch (Exception e) {

 e.printStackTrace();

}
 return tmp;
}
/**


<p>
采用JDK內置類進行真正的加密操作
@param byteS
@param password
@return 
@return byte[]    
author: Heweipo
*/
private static byte[] encryptByte(byte[] byteS, byte password[]) {
 byte[] byteFina = null;
 try {// 初始化加密/解密工具

 Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
 DESKeySpec desKeySpec = new DESKeySpec(password);
 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
 SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
 IvParameterSpec iv = new IvParameterSpec(keys);
 cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
 byteFina = cipher.doFinal(byteS);

} catch (Exception e) {

 throw new RuntimeException(e);

}
 return byteFina;
}
/**


<p>
采用JDK對應的內置類進行解密操作
@param byteS
@param password
@return 
@return byte[]    
author: Heweipo
*/
private static byte[] decryptByte(byte[] byteS, byte password[]) {
 byte[] byteFina = null;
 try {// 初始化加密/解密工具

 Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
 DESKeySpec desKeySpec = new DESKeySpec(password);
 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
 SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
 IvParameterSpec iv = new IvParameterSpec(keys);
 cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
 byteFina = cipher.doFinal(byteS);

} catch (Exception e) {

 throw new RuntimeException(e);

}
 return byteFina;
}
/**


<p>
Des加密strMing，然后base64轉換
@param strMing
@param md5key
@return 
@return String    
author: Heweipo
*/
public static String encryptStr(String strMing, byte md5key[]) {
 byte[] byteMi = null;
 byte[] byteMing = null;
 String strMi = "";
 try {

 byteMing = strMing.getBytes("utf-8");
 byteMi = encryptByte(byteMing, md5key);
 BASE64Encoder base64Encoder = new BASE64Encoder();
 strMi = base64Encoder.encode(byteMi);

} catch (Exception e) {

 throw new RuntimeException(e);

} finally {

 byteMing = null;
 byteMi = null;

}
 return strMi;
}
/**


<p>
Base64轉換strMi,然后進行des解密
@param strMi
@param md5key
@return 
@return String    
author: Heweipo
*/
public static String decryptStr(String strMi, byte md5key[]) {
 byte[] byteMing = null;
 String strMing = "";
 try {

 BASE64Decoder decoder = new BASE64Decoder();
 byteMing = decoder.decodeBuffer(strMi);
 byteMing = decryptByte(byteMing, md5key);
 strMing = new String(byteMing);

} catch (Exception e) {

 throw new RuntimeException(e);

} finally {

 byteMing = null;

}
 return strMing;
}
public static void main(String[] args) {
String[] keys = {"leagsoft","leagsoftpo","leagsoftiu","leagsoftyy","leagsoftew","leagsoftmm"};
 for(String key : keys){

 String data = "我是learn_more，who are you?";
 try{
     System.out.println(DesCoderUtil.encryptStr(data, DesCoderUtil.getMD5(key.getBytes("utf-8"))));
     System.out.println("--------------");
     System.out.println(DesCoderUtil.decryptStr(DesCoderUtil.encryptStr(data, DesCoderUtil.getMD5(key.getBytes("utf-8"))), 
             DesCoderUtil.getMD5(key.getBytes("utf-8"))));
 }catch(Exception e){
     e.printStackTrace();
 }

}
}




}</pre></span> 來自：http://my.oschina.net/u/1989321/blog/335210