利用3DES实现加密解密的Java代码

2015/07/25 40929
采用ECB，补位模式为：PKCS5
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
 
 
/**
 * 项目名称：****    
 * 类名称：ThreeDES    
 * 类描述： 3des 加密工具类        
 * @version  1.0   
 *
 */
public class ThreeDES {
     
   //key 根据实际情况对应的修改
   private final byte[] keybyte="123456788765432112345678".getBytes(); //keybyte为加密密钥，长度为24字节
   private static final String Algorithm = "DESede"; //定义 加密算法,可用 DES,DESede,Blowfish
   private SecretKey deskey;
   ///生成密钥
   public ThreeDES(){
       deskey = new SecretKeySpec(keybyte, Algorithm);
   }
   //加密
   public byte[] encrypt(byte[] data){
        try {
            Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, deskey);
            return cipher.doFinal(data);
        } catch (Exception ex) {
            //加密失败，打日志
            ex.printStackTrace();
        } 
        return null;
   }
   //解密
   public byte[] decrypt(byte[] data){
       try {
            Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE,deskey);
            return cipher.doFinal(data);
        } catch (Exception ex) {
            //解密失败，打日志
            ex.printStackTrace();
        } 
        return null;
   }
    
    
   public static void main(String[] args) throws Exception {
       ThreeDES des=new ThreeDES();
       String req ="135|一二|10100001|410883198501285014|||||1|2|";
//       String req1 ="<?xml version=\"1.0\" encoding=\"UTF-8\"?><service><head><field name=\"spdtrancode\">11111</field><field name=\"spdtranserno\">CM0172061308908f4dc995222321f6ecb888</field><field name=\"spdressys\">2001</field><field name=\"spdresdate\">20141223</field><field name=\"spdrestime\">153606</field><field name=\"spdtranstate\">S</field><field name=\"spderrocode\"></field><field name=\"spderrormsg\"></field></head><body><field name=\"spdcheckrslt\">000000</field></body></service>";
        
       String toreq  =toHexString(req);
       System.err.println("十六进制报文===="+toreq);
       byte [] srcData=req.toString().getBytes("GBK");
       byte[] encryptData=des.encrypt(srcData);
       System.out.println("密文：");
       if(encryptData!=null){
           for(int i=0;i<encryptData.length;i++){
               String hex=Integer.toHexString(encryptData[i]);
               if(hex.length()>1)
                System.out.print(hex.substring(hex.length()-2)+" ");
               else
                System.out.print("0"+hex+" ");
           }
       }
       System.out.println("");
       System.out.println("明文：");
   }
    
   // 转化字符串为十六进制编码
   public static String toHexString(String s) {
       String str = "";
       for (int i = 0; i < s.length(); i++) {
           int ch = (int) s.charAt(i);
           String s4 = Integer.toHexString(ch);
           str = str + s4;
       }
       return str;
   }
}
代码片段
