Des加解密工具

import java.security.Key;

import java.security.Security;

import java.util.Date;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import com.hurong.core.util.DateUtil;

public class DesUtils {

         private static String strDefaultKey = "";//字符串默认键值

         private Cipher encryptCipher = null;//加密工具

         private Cipher decryptCipher = null;//解密工具

         /** 

          * 将byte数组转换为表示16进制值的字符串, 如:byte[]{8,18}转换为:0813, 和public static byte[] 

          * hexStr2ByteArr(String strIn) 互为可逆的转换过程  

          * @param arrB  需要转换的byte数组 

          * @return 转换后的字符串 

          * 

          */

         public static String byteArr2HexStr(byte[] arrB){

                   int iLen = arrB.length;

                   StringBuffer sb = new StringBuffer(iLen * 2);// 每个byte用两个字符才能表示,所以字符串的长度是数组长度的两倍  

                   for (int i = 0; i < iLen; i++) {

                            int intTmp = arrB[i];

                            while (intTmp < 0) {// 把负数转换为正数  

                                     intTmp = intTmp + 256;

                            }

                            if (intTmp < 16) {// 小于0F的数需要在前面补0  

                                     sb.append("0");

                            }

                            sb.append(Integer.toString(intTmp, 16));

                   }

                   return sb.toString();

         }

         /** 

          * 将表示16进制值的字符串转换为byte数组, 和public static String byteArr2HexStr(byte[] arrB) 

          * 互为可逆的转换过程 

          *  

          * @param strIn  需要转换的字符串 

          * @return 转换后的byte数组 

          */

         public static byte[] hexStr2ByteArr(String strIn){

                   byte[] arrB = strIn.getBytes();

                   int iLen = arrB.length;

                   byte[] arrOut = new byte[iLen / 2];// 两个字符表示一个字节,所以字节数组长度是字符串长度除以2  

                   for (int i = 0; i < iLen; i = i + 2) {

                            String strTmp = new String(arrB, i, 2);

                            arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);

                   }

                   return arrOut;

         }

         /** 

          * 默认构造方法,使用默认密钥 

          *  

          * @throws Exception 

          */

         public DesUtils() throws Exception {

                   this(strDefaultKey);

         }

         /**  

          * DES字符串加密

          * 指定密钥构造方法 

          * @param strKey  指定的密钥

          * @throws Exception 

          */

         public DesUtils(String strKey){

                   Security.addProvider(new com.sun.crypto.provider.SunJCE());

                   try {

                            Key key = getKey(strKey.getBytes());

                            encryptCipher = Cipher.getInstance("DES");

                            encryptCipher.init(Cipher.ENCRYPT_MODE, key);

                            decryptCipher = Cipher.getInstance("DES");

                            decryptCipher.init(Cipher.DECRYPT_MODE, key);

                   } catch (Exception e) {

                            e.printStackTrace();

                   }

         }

         /** 

          * 加密字节数组 

          *  

          * @param arrB  需加密的字节数组

          * @return 加密后的字节数组 

          * @throws Exception 

          */

         public byte[] encrypt(byte[] arrB){

                   byte[] encrypt=null;

                   try {

                             encrypt=encryptCipher.doFinal(arrB);

                   } catch (Exception e) {

                            e.printStackTrace();

                            return null;

                   }

                   return encrypt;

         }

         /** 

          * 加密字符串 

          *  

          * @param strIn   需加密的字符串

          * @return 加密后的字符串 

          * @throws Exception 

          */

         public String encrypt(String strIn){

                   return byteArr2HexStr(encrypt(strIn.getBytes()));

         }

         /** 

          * 解密字节数组 

          *  

          * @param arrB  需解密的字节数组 

          * @return 解密后的字节数组 

          * @throws Exception 

          */

         public byte[] decrypt(byte[] arrB) throws BadPaddingException{

                   byte[] decrypt=null;

                   try {

                            decrypt= decryptCipher.doFinal(arrB);

                   } catch (Exception e) {

                            //e.printStackTrace();

                            return null;

                   }

                   return decrypt;

         }

         /** 

          * 解密字符串 

          *  

          * @param strIn  需解密的字符串 

          * @return 解密后的字符串 

          * @throws Exception 

          */

         public String decrypt(String strIn) throws BadPaddingException{

                  

                   if(null==decrypt(hexStr2ByteArr(strIn))){

                            return "";

                   }

                   return new String(decrypt(hexStr2ByteArr(strIn)));

         }

         /** 

          * 从指定字符串生成密钥,密钥所需的字节数组长度为8位 不足8位时后面补0,超出8位只取前8位 

          *  

          * @param arrBTmp  构成该字符串的字节数组 

          * @return 生成的密钥 

          * @throws java.lang.Exception 

          */

         private Key getKey(byte[] arrBTmp) throws Exception {

                   byte[] arrB = new byte[8];// 创建一个空的8位字节数组(默认值为0)  

                   for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {// 将原始字节数组转换为8位  

                            arrB[i] = arrBTmp[i];

                   }

                   Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");// 生成密钥  

                   return key;

         }

         public static boolean getAuthorization(String password,String key){

                  

                   try{

                            boolean flag=false;

                            DesUtils des = new DesUtils(password);//自定义密钥  

                            String code=des.decrypt(key);

                            String mac=GetMACUtil.getMacStr();//机器码

                            if(mac.equals(code)){

                                     flag=true;

                            }

                            return flag;

                   }

                   catch (Exception e) {

                            e.printStackTrace();

                            return false;

                   }

         }

        

         public String getEncod(String mahCode,String password,String endDate,DesUtils des)

         {

                   try

                   {

                   String str="";

                   String dstr=mahCode+","+endDate;

                   str=des.encrypt(dstr);

                   return str;

                   }

                   catch (Exception e) {

                            e.printStackTrace();

                            return "";

                   }

         }

         public static void main(String[] args) {

                DesUtils du=new DesUtils("creditsoftware");

                String code=du.getEncod("70-1A-04-71-09-0E", "creditsoftware", "2012-12-31", du);

                System.out.println(code);

                  

         }

}

原文地址:https://www.cnblogs.com/chinaifae/p/10401166.html