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  • 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);

                      

             }

    }

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