/**
* @(#)Eryptogram.java 1.00 04/03/11
*
* Copyright (c) 2003-2004 Abacus,Ltd.
*
* 加密解密類
*
*
*
*/
package cn.com.sinosoft.smp.util;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.servlet.http.HttpServletRequest;
import com.uncnet.framework.utils.permission;
/**
* 加密解密類
*/
public class Eryptogram {
private static String Algorithm = "DES";
// 定義 加密算法,可用 DES,DESede,Blowfish
static boolean debug = false;
/**
* 構造子註解.
*/
public Eryptogram() {
}
/**
* 生成密鑰
*
* @return byte[] 返回生成的密鑰
* @throws exception
* 扔出異常.
*/
public static byte[] getSecretKey() throws Exception {
KeyGenerator keygen = KeyGenerator.getInstance(Algorithm);
SecretKey deskey = keygen.generateKey();
if (debug)
System.out.println("生成密鑰:" + byte2hex(deskey.getEncoded()));
return deskey.getEncoded();
}
/**
* 將指定的數據根據提供的密鑰進行加密
*
* @param input
* 需要加密的數據
* @param key
* 密鑰
* @return byte[] 加密後的數據
* @throws Exception
*/
public static byte[] encryptData(byte[] input, byte[] key) throws Exception {
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key, Algorithm);
if (debug) {
System.out.println("加密前的二進串:" + byte2hex(input));
System.out.println("加密前的字符串:" + new String(input));
}
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.ENCRYPT_MODE, deskey);
byte[] cipherByte = c1.doFinal(input);
if (debug)
System.out.println("加密後的二進串:" + byte2hex(cipherByte));
return cipherByte;
}
/**
* 將給定的已加密的數據通過指定的密鑰進行解密
*
* @param input
* 待解密的數據
* @param key
* 密鑰
* @return byte[] 解密後的數據
* @throws Exception
*/
public static byte[] decryptData(byte[] input, byte[] key) throws Exception {
SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key, Algorithm);
if (debug)
System.out.println("解密前的信息:" + byte2hex(input));
Cipher c1 = Cipher.getInstance(Algorithm);
c1.init(Cipher.DECRYPT_MODE, deskey);
byte[] clearByte = c1.doFinal(input);
if (debug) {
System.out.println("解密後的二進串:" + byte2hex(clearByte));
System.out.println("解密後的字符串:" + (new String(clearByte)));
}
return clearByte;
}
/**
* 字節碼轉換成16進制字符串
*
* @param byte[]
* b 輸入要轉換的字節碼
* @return String 返回轉換後的16進制字符串
*/
public static String byte2hex(byte[] b) {
String hs = "";
String stmp = "";
for (int n = 0; n < b.length; n++) {
stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
if (stmp.length() == 1)
hs = hs + "0" + stmp;
else
hs = hs + stmp;
if (n < b.length - 1)
hs = hs + ":";
}
return hs.toUpperCase();
}
public String encryptData1(HttpServletRequest request){
permission userperm =
(permission) request.getSession().getAttribute("PermMgr");
Eryptogram etg = new Eryptogram();
String data1 = userperm.getUsername()+","+userperm.getUserid();
byte[] key;
byte[] en = null;;
try {
key = etg.getSecretKey();
byte[] data = data1.getBytes();
en = etg.encryptData(data, key);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return new String(en);
}
public byte[] encryptData2(HttpServletRequest request){
permission userperm =
(permission) request.getSession().getAttribute("PermMgr");
Eryptogram etg = new Eryptogram();
String data1 = userperm.getUsername()+","+userperm.getUserid();
byte[] key;
byte[] en = null;;
try {
key = etg.getSecretKey();
byte[] data = data1.getBytes();
en = etg.encryptData(data, key);
// return byte2hex(en);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return en;
}
public static void main(String[] args) {
try {
debug = false;
Eryptogram etg = new Eryptogram();
byte[] key = etg.getSecretKey();
System.out.println("key = " + key);
String aa = "ck==1234567";
byte[] data = aa.getBytes();
System.out.println(data);
byte[] en = etg.encryptData(data, key);
System.out.println("encryptData = " + new String(en));
byte[] de = etg.decryptData(en, key);
System.out.println("decryptData = " + new String(de));
} catch (Exception e) {
e.printStackTrace();
}
}
}