package net.okdi.o2o.core.util;
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()));//linux環境下會每次會不同，windows不會
//SecureRandom 實現嘗試完全隨機化生成器本身的內部狀態，除非調用方在調用 getInstance 方法之後又調用了 setSeed 方法：
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
secureRandom.setSeed(strKey.getBytes());
_generator.init(secureRandom);
this.key = _generator.generateKey();
_generator = null;
//另一种方式
//KeySpec dks = new DESKeySpec(strKey.getBytes());
//SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//this.key = keyFactory.generateSecret(dks);
} 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 = "";
if(strMi!=null && !strMi.equals(""))
{
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 = Cipher.getInstance("PKCS5Padding");
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 = Cipher.getInstance("PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key);
byteFina = cipher.doFinal(byteD);
} catch (Exception e) {
e.printStackTrace();
} finally {
cipher = null;
}
return byteFina;
}
/**
* 转换密码
*/
public String convertPwd(String loginPwd,String type){
DesEncrypt des = new DesEncrypt();// 实例化一个对像
String key=ApplicationConstant.PASSWORD_KEY;
des.getKey(key);
if(type.equals("ENC")){
loginPwd = des.getEncString(loginPwd);//加密
}else{
loginPwd = des.getDesString(loginPwd);//解密
}
return loginPwd;
}
public static void main(String[] args) {
DesEncrypt des = new DesEncrypt();// 实例化一个对像
// des.getKey("MYKEY11");// 生成密匙
// System.out.println("key=MYKEY11");
// String strEnc = des.getEncString("CHINA");// 加密字符串,返回String的密文
// System.out.println("密文=" + strEnc);
//
// String strDes = des.getDesString(strEnc);// 把String 类型的密文解密
// System.out.println("明文=" + strDes);
String t = des.convertPwd("123456", "ENC");
System.out.println(t);
String t1 = des.convertPwd(t, "ABC");
System.out.println(t1);
}
}
