JavaUtil_06_DES加解密工具

一、示例

CommonUtil.java

package com.ray.test.des;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class CommonUtil {
    public static void main(String[] args) {

       byte[] before=new byte[] {80, 75, 3, 4, 10, 60, 82, -83, 68, 8, 0, 28, 0, 80, 97, 121, 108, 108};
       String mes=getStringFromBytes(before);

       byte[] after=getBytesFromString(  mes);

       System.out.println("before= "+Arrays.toString(before));
       System.out.println("after = "+Arrays.toString(after));
    }

    public static String  getStringFromBytes( byte[] before ) {
          BASE64Encoder enc=new BASE64Encoder();
          String mes=enc.encodeBuffer(before); //使用BASE64编码
        return mes;
    }

    public static byte[]  getBytesFromString( String mes) {
         BASE64Decoder dec=new BASE64Decoder();
         byte[]after=null;
         try {
             after =dec.decodeBuffer(mes);//使用BASE64解码
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }       return after;
  }

}

DESTest.java

package com.ray.test.des;

import java.io.IOException;
import java.security.SecureRandom;
import java.util.Arrays;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;  

/**
 * DESTest.java
 *
 * @author Techzero
 * @Email techzero@163.com
 * @Time 2013-12-12 下午2:22:58
 */
public class DESTest {  

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        String content = "wzm";
        // 密码长度必须是8的倍数
        String password = "12345678";
        System.out.println("密　钥：" + password);
        System.out.println("加密前：" + content);  

        //1.加密
        byte[] result = encrypt(content, password);
        System.out.println("result  length：" + result.length);

        System.out.println("加密后：" + Arrays.toString(result));

        //2.解密
        String decryResult = decrypt(result, password);
        System.out.println("解密后：" + decryResult);  

        //3.将字节转String
        String mes=CommonUtil.getStringFromBytes(result);
        System.out.println("mes：" + mes);  

        //4.将String转字节
        byte[] after=CommonUtil.getBytesFromString(mes);

        String decryResultString =decrypt(after, password);
        System.out.println("decryResultString解密后：" + decryResultString); 

    }  

    /**
     * 加密
     *
     * @param content
     *            待加密内容
     * @param key
     *            加密的密钥
     * @return
     */
    public static byte[] encrypt(String content, String key) {
        try {
            SecureRandom random = new SecureRandom();
            DESKeySpec desKey = new DESKeySpec(key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey securekey = keyFactory.generateSecret(desKey);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, securekey, random);
            byte[] result = cipher.doFinal(content.getBytes());
            return result;
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;
    }  

    /**
     * 解密
     *
     * @param content
     *            待解密内容
     * @param key
     *            解密的密钥
     * @return
     */
    public static String decrypt(byte[] content, String key) {
        try {
            SecureRandom random = new SecureRandom();
            DESKeySpec desKey = new DESKeySpec(key.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey securekey = keyFactory.generateSecret(desKey);
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, securekey, random);
            byte[] result = cipher.doFinal(content);
            return new String(result);
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return null;
    }  

}  

二、参考资料

1.Java DES 加密 解密 示例