java DES 加密解密 算法

import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;

import Decoder.BASE64Decoder;
import Decoder.BASE64Encoder;


/** 
*  
* 使用DES加密与解密,可对byte[],String类型进行加密与解密 密文可使用String,byte[]存储. 
*  
* 方法: void getKey(String strKey)从strKey的字条生成一个Key 
*  
* String getEncString(String strMing)对strMing进行加密,返回String密文 String 
* getDesString(String strMi)对strMin进行解密,返回String明文 
*  
* byte[] getEncCode(byte[] byteS)byte[]型的加密 byte[] getDesCode(byte[] 
* byteD)byte[]型的解密 
*/ 
 
public class HttpUtil {  
    Key key;  
 
    /** 
     * 根据参数生成KEY 
     *  
     * @param strKey 
     */ 
    public void getKey(String strKey) {  
        try {  
            KeyGenerator _generator = KeyGenerator.getInstance("DES");  
            _generator.init(new SecureRandom(strKey.getBytes()));  
            this.key = _generator.generateKey();
            _generator = null;  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
 
    /** 
     * 加密String明文输入,String密文输出 
     *  
     * @param strMing 
     * @return 
     */ 
    public String getEncString(String strMing) {  
        byte[] byteMi = null;  
        byte[] byteMing = null;  
        String strMi = "";  
        BASE64Encoder base64en = new BASE64Encoder();  
        try {  
            byteMing = strMing.getBytes("UTF8");  
            byteMi = this.getEncCode(byteMing);  
            strMi = base64en.encode(byteMi);  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            base64en = null;  
            byteMing = null;  
            byteMi = null;  
        }  
        return strMi;  
    }  
 
    /** 
     * 解密 以String密文输入,String明文输出 
     *  
     * @param strMi 
     * @return 
     */ 
    public String getDesString(String strMi) {  
        BASE64Decoder base64De = new BASE64Decoder();  
        byte[] byteMing = null;  
        byte[] byteMi = null;  
        String strMing = "";  
        try {  
            byteMi = base64De.decodeBuffer(strMi);  
            byteMing = this.getDesCode(byteMi);  
            strMing = new String(byteMing, "UTF8");  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            base64De = null;  
            byteMing = null;  
            byteMi = null;  
        }  
        return strMing;  
    }  
 
    /** 
     * 加密以byte[]明文输入,byte[]密文输出 
     *  
     * @param byteS 
     * @return 
     */ 
    private byte[] getEncCode(byte[] byteS) {  
        byte[] byteFina = null;  
        Cipher cipher;  
        try {  
            cipher = Cipher.getInstance("DES");  
            cipher.init(Cipher.ENCRYPT_MODE, key);  
            byteFina = cipher.doFinal(byteS);  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            cipher = null;  
        }  
        return byteFina;  
    }  
 
    /** 
     * 解密以byte[]密文输入,以byte[]明文输出 
     *  
     * @param byteD 
     * @return 
     */ 
    private byte[] getDesCode(byte[] byteD) {  
        Cipher cipher;  
        byte[] byteFina = null;  
        try {  
            cipher = Cipher.getInstance("DES");  
            cipher.init(Cipher.DECRYPT_MODE, key);  
            byteFina = cipher.doFinal(byteD);  
        } catch (Exception e) {  
            e.printStackTrace();  
        } finally {  
            cipher = null;  
        }  
        return byteFina;  
 
    }  
 
    public static void main(String[] args) {  
        HttpUtil des = new HttpUtil();// 实例化一个对像  
        des.getKey("daliantan0v0");// 生成密匙  
       
        System.out.println("=================对字符串加密==================================");
        String strEnc = des.getEncString("ysj");// 加密字符串,返回String的密文  
        System.out.println(strEnc);  
 
        String strDes = des.getDesString("anihPu3p3lk=");// 把String 类型的密文解密   
        System.out.println(strDes);  
       
        System.out.println("==================对字节数组加密=================================");
       
       /*
        byte[] getEncCode(byte[] byteS)byte[]型的加密 byte[] getDesCode(byte[] 
                                                                         * byteD)byte[]型的解密
                                                            */
    }  
 
}


第二种方式：

public  class HttpUtil {
       
        /**
* DES 加密算法
* @param message
* @param key
* @return
* @throws Exception
*/
        public String EncryptAsDoNet(String message, String key) throws Exception  {
            //产生与.net 对应的加密des + base64 加密串
            Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
            DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("GB2312"));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes("GB2312"));
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
            byte[] encryptbyte = cipher.doFinal(message.getBytes());
            BASE64Encoder base64Encoder = new BASE64Encoder();
            //base64Encoder.encode(encryptbyte);
            return base64Encoder.encode(encryptbyte);
            //toHexString(encryptbyte).toUpperCase();
        }
       
        /**
* DES 解密算法
* @param message
* @param key
* @return
* @throws Exception
*/
        public String DecryptDoNet(String message, String key) throws Exception {
            //base64 + des 解密.net 加密传来串
            //byte[] bytesrc = convertHexString(message); //不用base64 的方式
            BASE64Decoder base64Decoder = new BASE64Decoder();
            byte[] bytesrc=base64Decoder.decodeBuffer(message);
            Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");
            DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("GB2312"));
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes("GB2312"));
            cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
            byte[] retByte = cipher.doFinal(bytesrc);

            return new String(retByte);
        }
       
        public static void main(String[] args) {
HttpUtil httpUtil = new HttpUtil();
try {
System.out.println(httpUtil.EncryptAsDoNet("ysj","Ango.WTS"));
System.out.println(httpUtil.DecryptDoNet("eTMv8FChooc=","Ango.WTS" ));
} catch (Exception e) {
System.out.println("e="+e);
}

}
    }



需要用到的 BASE64Decoder 包在附件

评论

2 楼 yangsongjing 2014-02-24  

comsci 写道

非常感谢.....

希望大家的代码和文档都能够用一种简单的方法加密存储起来,起码老板看不懂嘛

是的

1 楼 comsci 2014-02-24  

非常感谢.....

希望大家的代码和文档都能够用一种简单的方法加密存储起来,起码老板看不懂嘛