java DES ECB模式对称加密解密

浏览数：27 / 时间：2015年06月08日

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：

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:[email protected]
 * 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);
    }
}

转码工具类（包含MD5加密）

package com.palmfu.sql;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/***
* 转码   MD5工具类
* @author spring sky
* Email:[email protected]
* QQ:840950105
*
*/
public final class ConvertUtil {

   public final static char[] BToA = "0123456789abcdef".toCharArray();

   private ConvertUtil() {

   }

   /**
   * 把16进制字符串转换成字节数组
   *
   * @param hex
   * @return
   */
   public static byte[] hexStringToByte(String hex) {
       int len = (hex.length() / 2);
       byte[] result = new byte[len];
       char[] achar = hex.toCharArray();
       for (int i = 0; i < len; i++) {
           int pos = i * 2;
           result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));
       }
       return result;
   }

   private static byte toByte(char c) {
       byte b = (byte) "0123456789ABCDEF".indexOf(c);
       return b;
   }

   /**
   * 把字节数组转换成16进制字符串
   *
   * @param bArray
   * @return
   */
   public static final String bytesToHexString(byte[] bArray) {
       if(bArray == null )
       {
           return "";
       }
       StringBuffer sb = new StringBuffer(bArray.length);
       String sTemp;
       for (int i = 0; i < bArray.length; i++) {
           sTemp = Integer.toHexString(0xFF & bArray[i]);
           if (sTemp.length() < 2)
               sb.append(0);
           sb.append(sTemp.toUpperCase());
       }
       return sb.toString();
   }

   /**
   * 把字节数组转换为对象
   *
   * @param bytes
   * @return
   * @throws IOException
   * @throws ClassNotFoundException
   */
   public static final Object bytesToObject(byte[] bytes) throws IOException,
           ClassNotFoundException {
       ByteArrayInputStream in = new ByteArrayInputStream(bytes);
       ObjectInputStream oi = new ObjectInputStream(in);
       Object o = oi.readObject();
       oi.close();
       return o;
   }

   /**
   * 把可序列化对象转换成字节数组
   *
   * @param s
   * @return
   * @throws IOException
   */
   public static final byte[] objectToBytes(Serializable s) throws IOException {
       ByteArrayOutputStream out = new ByteArrayOutputStream();
       ObjectOutputStream ot = new ObjectOutputStream(out);
       ot.writeObject(s);
       ot.flush();
       ot.close();
       return out.toByteArray();
   }

   public static final String objectToHexString(Serializable s)
           throws IOException {
       return bytesToHexString(objectToBytes(s));
   }

   public static final Object hexStringToObject(String hex)
           throws IOException, ClassNotFoundException {
       return bytesToObject(hexStringToByte(hex));
   }

   /**
   * @函数功能: BCD码转为10进制串(阿拉伯数据)
   * @输入参数: BCD码
   * @输出结果: 10进制串
   */
   public static String bcd2Str(byte[] bytes) {
       StringBuffer temp = new StringBuffer(bytes.length * 2);

       for (int i = 0; i < bytes.length; i++) {
           temp.append((byte) ((bytes[i] & 0xf0) >>> 4));
           temp.append((byte) (bytes[i] & 0x0f));
       }
       return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp
               .toString().substring(1) : temp.toString();
   }

   /**
   * @函数功能: 10进制串转为BCD码
   * @输入参数: 10进制串
   * @输出结果: BCD码
   */
   public static byte[] str2Bcd(String asc) {
       int len = asc.length();
       int mod = len % 2;

       if (mod != 0) {
           asc = "0" + asc;
           len = asc.length();
       }

       byte abt[] = new byte[len];
       if (len >= 2) {
           len = len / 2;
       }

       byte bbt[] = new byte[len];
       abt = asc.getBytes();
       int j, k;

       for (int p = 0; p < asc.length() / 2; p++) {
           if ((abt[2 * p] >= ‘0‘) && (abt[2 * p] <= ‘9‘)) {
               j = abt[2 * p] - ‘0‘;
           } else if ((abt[2 * p] >= ‘a‘) && (abt[2 * p] <= ‘z‘)) {
               j = abt[2 * p] - ‘a‘ + 0x0a;
           } else {
               j = abt[2 * p] - ‘A‘ + 0x0a;
           }

           if ((abt[2 * p + 1] >= ‘0‘) && (abt[2 * p + 1] <= ‘9‘)) {
               k = abt[2 * p + 1] - ‘0‘;
           } else if ((abt[2 * p + 1] >= ‘a‘) && (abt[2 * p + 1] <= ‘z‘)) {
               k = abt[2 * p + 1] - ‘a‘ + 0x0a;
           } else {
               k = abt[2 * p + 1] - ‘A‘ + 0x0a;
           }

           int a = (j << 4) + k;
           byte b = (byte) a;
           bbt[p] = b;
       }
       return bbt;
   }

   public static String BCD2ASC(byte[] bytes) {
       StringBuffer temp = new StringBuffer(bytes.length * 2);

       for (int i = 0; i < bytes.length; i++) {
           int h = ((bytes[i] & 0xf0) >>> 4);
           int l = (bytes[i] & 0x0f);
           temp.append(BToA[h]).append(BToA[l]);
       }
       return temp.toString();
   }

   /**
   * 两字符数组异或
   */
   public static byte[] byteArrXor(byte[] arr1, byte[] arr2, int len){
       byte[] dest = new byte[len];

       if((arr1.length < len) || (arr2.length < len)){
           return null;
       }

       for(int i = 0;i < len;i++){
           dest[i] = (byte)(arr1[i] ^ arr2[i]);
       }

       return dest;
   }


   /**
   * MD5加密字符串，返回加密后的16进制字符串
   * @param origin
   * @return
   */
   public static String MD5EncodeToHex(String origin) {
       return bytesToHexString(MD5Encode(origin));
   }

   /**
   * MD5加密字符串，返回加密后的字节数组
   *
   * @param origin
   * @return
   */
   public static byte[] MD5Encode(String origin) {
       return MD5Encode(origin.getBytes());
   }

   /**
   * MD5加密字节数组，返回加密后的字节数组
   *
   * @param bytes
   * @return
   */
   public static byte[] MD5Encode(byte[] bytes) {
       MessageDigest md = null;
       try {
           md = MessageDigest.getInstance("MD5");
           return md.digest(bytes);
       } catch (NoSuchAlgorithmException e) {
           e.printStackTrace();
           return new byte[0];
       }

   }
}