JAVA中3des加密算法

package test; 

/* 
* 当前文件：ThreeDES.java 
* 作者：fenglingcompany 
*/ 

import java.security.Key; 
import java.security.SecureRandom; 
import javax.crypto.Cipher; 
import javax.crypto.KeyGenerator; 

import sun.misc.BASE64Decoder; 
import sun.misc.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 ThreeDES{ 
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) { 
ThreeDES des = new ThreeDES();// 实例化一个对像 
des.getKey("fenglingcompany");// 生成密匙 

String strEnc = des.getEncString("fengye666666666");// 加密字符串,返回String的密文 
System.out.println(strEnc); 

String strDes = des.getDesString(strEnc);// 把String 类型的密文解密 
System.out.println(strDes); 
} 

} 

 

评论

1 楼 lijunjie337 2010-07-23  

你这是DES还是3DES啊？？