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