import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class PasswordEncryption {
private static final String PASSWORD_CRYPT_KEY = "_hrwps20090716pass_";
private final static String DES = "DES";
/**
*
* 加密
*
* @param src
* 数据源
*
* @param key
* 密钥，长度必须是8的倍数
*
* @return 返回加密后的数据
*
* @throws Exception
*
*/
public static byte[] encrypt(byte[] src, byte[] key) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成加密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
// 现在，获取数据并加密
// 正式执行加密操作
return cipher.doFinal(src);
}
/**
*
* 解密
*
* @param src
* 数据源
*
* @param key
* 密钥，长度必须是8的倍数
*
* @return 返回解密后的原始数据
*
* @throws Exception
*
*/
public static byte[] decrypt(byte[] src, byte[] key) throws Exception {
// DES算法要求有一个可信任的随机数源
SecureRandom sr = new SecureRandom();
// 从原始密匙数据创建一个DESKeySpec对象
DESKeySpec dks = new DESKeySpec(key);
// 创建一个密匙工厂，然后用它把DESKeySpec对象转换成
// 一个SecretKey对象
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
SecretKey securekey = keyFactory.generateSecret(dks);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance(DES);
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
// 现在，获取数据并解密
// 正式执行解密操作
return cipher.doFinal(src);
}
/**
*
* 密码解密
*
* @param data
*
* @return
*
* @throws Exception
*
*/
public final static String decrypt(String data) {
try {
return new String(decrypt(hex2byte(data.getBytes()), PASSWORD_CRYPT_KEY.getBytes()));
} catch (Exception e) {
}
return null;
}
/**
*
* 密码加密
*
* @param password
*
* @return
*
* @throws Exception
*
*/
public final static String encrypt(String password) {
try {
return byte2hex(encrypt(password.getBytes(), PASSWORD_CRYPT_KEY
.getBytes()));
} catch (Exception e) {
}
return null;
}
/**
*
* 二行制转字符串
*
* @param b
*
* @return
*
*/
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;
}
return hs.toUpperCase();
}
public static byte[] hex2byte(byte[] b) {
if ((b.length % 2) != 0)
throw new IllegalArgumentException("长度不是偶数");
byte[] b2 = new byte[b.length / 2];
for (int n = 0; n < b.length; n += 2) {
String item = new String(b, n, 2);
b2[n / 2] = (byte) Integer.parseInt(item, 16);
}
return b2;
}
/**
* 获得一个随机的加密密码
* @param minLen:密码的最小长度
* @param maxLen:密码的最大长度
* @return
*/
public String getRandomEncryptPassword(int minLen,int maxLen){
String randPassword="";
String randChar="abcdefghijklmnopqrstuvwxyz1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int randNum=(int)(Math.random()*(maxLen-minLen+1))+minLen; //密码的随机长度(minLen<=length<=maxLen)
for(int i=0;i<randNum;i++){
int randCharIndex=(int)(Math.random()*randChar.length());
randPassword=randPassword+randChar.charAt(randCharIndex);
}
String encryptPassword=this.encrypt(randPassword);
return encryptPassword;
}
// public ActionForward doUserPasswordChange(ActionMapping mapping, ActionForm form,
// HttpServletRequest request, HttpServletResponse response) {
//
// String password=request.getParameter("oldpass");
// String newPassword=request.getParameter("confirmPassword");
// TSmUser userLogin=(TSmUser) request.getSession().getAttribute("loginUser");
// PasswordEncryption passWordEncry = new PasswordEncryption();
// if(!userLogin.getUserPassword().equals(passWordEncry.encrypt(password.trim()))){
// request.getSession().setAttribute("msgs", "校验输入的旧密码错误");
// return mapping.findForward("change");
// }else if(userLogin.getUserPassword().equals(passWordEncry.encrypt(newPassword.trim()))){
// request.getSession().setAttribute("msgs", "输入的新密码于旧密码相同");
// return mapping.findForward("change");
// }else{
// userLogin.setUserPassword(passWordEncry.encrypt(newPassword.trim()));
// try{
// tsmuserImpl.update(userLogin);
// }catch(Exception e){
// request.getSession().setAttribute("msgs", "修改密码失败");
// return mapping.findForward("change");
// }
// return mapping.findForward("success");
// }
// }
public static void main(String[] args) {
String s=PasswordEncryption.decrypt("4094D62D6C8C89C7");
System.out.println(s);
}
}
