java DES ECB模式对称加密解密

最近需要又要使用DES加密数据，要求DES加密出来的数据为对称加密，经过研究，发现了一些问题：

1.DES对称ECB模式加密的数据，长度必须为8的倍数

2.加密的数据，加密后先转码(因为加密后的数据我是转码了)，否则解密是乱码格式

一下是源代码：

这个是加密的工具类：

[java]
package com.palmfu.sql;

import java.security.Key;

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

/***
* DES ECB对称加密解密
* @author spring sky
* Email:vipa1888@163.com
* QQ:840950105
*
*/
public class DesECBUtil {
    /**
     * 加密数据
     * @param encryptString 注意：这里的数据长度只能为8的倍数
     * @param encryptKey
     * @return
     * @throws Exception
     */
    public static String encryptDES(String encryptString, String encryptKey) throws Exception {
        SecretKeySpec key = new SecretKeySpec(getKey(encryptKey), "DES");
        Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        byte[] encryptedData = cipher.doFinal(encryptString.getBytes());
        return ConvertUtil.bytesToHexString(encryptedData);
    }

    /**
     * 自定义一个key
     * @param string
     */
    public static byte[] getKey(String keyRule) {
        Key key = null;
        byte[] keyByte = keyRule.getBytes();
        // 创建一个空的八位数组,默认情况下为0
        byte[] byteTemp = new byte[8];
        // 将用户指定的规则转换成八位数组
        for (int i = 0; i < byteTemp.length && i < keyByte.length; i++) {
            byteTemp[i] = keyByte[i];
        }
        key = new SecretKeySpec(byteTemp, "DES");
        return key.getEncoded();
    }

    /***
     * 解密数据
     * @param decryptString
     * @param decryptKey
     * @return
     * @throws Exception
     */
    public static String decryptDES(String decryptString, String decryptKey) throws Exception {
        SecretKeySpec key = new SecretKeySpec(getKey(decryptKey), "DES");
        Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte decryptedData[] = cipher.doFinal(ConvertUtil.hexStringToByte(decryptString));
        return new String(decryptedData);
    }

    public static void main(String[] args) throws Exception {
        String clearText = "springsk"; //这里的数据长度必须为8的倍数
        String key = "12345678";
        System.out.println("明文："+clearText+"\n密钥："+key);
        String encryptText = encryptDES(clearText, key);
        System.out.println("加密后："+encryptText);
        String decryptText = decryptDES(encryptText, key);
        System.out.println("解密后："+decryptText);
    }
}

package com.palmfu.sql;

import java.security.Key;

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

/***
* DES ECB对称加密解密
* @author spring sky
* Email:vipa1888@163.com
* QQ:840950105
*
*/
public class DesECBUtil {
/**
* 加密数据
* @param encryptString 注意：这里的数据长度只能为8的倍数
* @param encryptKey
* @return
* @throws Exception
*/
public static String encryptDES(String encryptString, String encryptKey) throws Exception {
  SecretKeySpec key = new SecretKeySpec(getKey(encryptKey), "DES");
  Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
  cipher.init(Cipher.ENCRYPT_MODE, key);
  byte[] encryptedData = cipher.doFinal(encryptString.getBytes());
  return ConvertUtil.bytesToHexString(encryptedData);
}

/**
* 自定义一个key
* @param string
*/
public static byte[] getKey(String keyRule) {
  Key key = null;
  byte[] keyByte = keyRule.getBytes();
  // 创建一个空的八位数组,默认情况下为0
  byte[] byteTemp = new byte[8];
  // 将用户指定的规则转换成八位数组
  for (int i = 0; i < byteTemp.length && i < keyByte.length; i++) {
   byteTemp[i] = keyByte[i];
  }
  key = new SecretKeySpec(byteTemp, "DES");
  return key.getEncoded();
}

/***
* 解密数据
* @param decryptString
* @param decryptKey
* @return
* @throws Exception
*/
public static String decryptDES(String decryptString, String decryptKey) throws Exception {
  SecretKeySpec key = new SecretKeySpec(getKey(decryptKey), "DES");
  Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
  cipher.init(Cipher.DECRYPT_MODE, key);
  byte decryptedData[] = cipher.doFinal(ConvertUtil.hexStringToByte(decryptString));
  return new String(decryptedData);
}

public static void main(String[] args) throws Exception {
  String clearText = "springsk"; //这里的数据长度必须为8的倍数
  String key = "12345678";
  System.out.println("明文："+clearText+"\n密钥："+key);
  String encryptText = encryptDES(clearT

补充：综合编程 , 安全编程 ,