java中加密算法的应用一：DES

第一种DES加密算法
import java.security.Key;
 
import java.security.SecureRandom;
 
import javax.crypto.Cipher;
 
import javax.crypto.KeyGenerator;
 
 
/**

*

* 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 = "";
try {
return byte2hex(getEncCode(strMing.getBytes()));
// byteMing = strMing.getBytes("UTF8");
// byteMi = this.getEncCode(byteMing);
// strMi = new String( byteMi,"UTF8");
} catch (Exception e) {
e.printStackTrace();
} finally {
byteMing = null;
byteMi = null;
}
return strMi;