3DES加密java的实现代码

/*
 * 当前文件：DesEncrypt.java
 * 创建日期：2005-7-29
 * 版 本 号：1.0
 * 作者：kang1
 *
 */

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 DesEncrypt
{
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){
 
 System.out.println("hello");
 DesEncrypt des=new DesEncrypt();//实例化一个对像
 des.getKey("aadd");//生成密匙

 String strEnc = des.getEncString("钟汉康");//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);

}

}