desutils.java

本文论述了一个前台笔记本销售系统的开发过程

/*
 * Created on Jun 14, 2005
 *
 * To change the template for this generated file go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */

package com.set.utils;

import com.set.utils.crypt.Des;

/**
 * @author Administrator
 * 
 * To change the template for this generated type comment go to
 * Window>Preferences>Java>Code Generation>Code and Comments
 */
public class DesUtils {
	public static String Encrypt(String origindata) {
		String ret = null;
		Des des = new Des();
		byte[] data;
		data = des.encrypt("utmp", origindata.getBytes());
		ret = "";
		for (int i = 0; i < data.length; i++) {
			String tmp = Integer.toString(data[i] & 0xff, 16);
			if (tmp.length() == 1)
				tmp = "0" + tmp;
			if (tmp.length() == 0)
				tmp = "00";
			ret = ret + tmp;
		}
		return ret;

	}

	public static String Decrypt(String encryptdata) {
		String ret = null;
		Des des = new Des();
		byte[] data = new byte[encryptdata.length() / 2];
		int i;
		for (i = 0; i * 2 < encryptdata.length(); i++) {
			data[i] = (byte) (Integer.parseInt(encryptdata.substring(i + i, i
					+ i + 2), 16));
		}
		// data[i] = (byte)0;
		return new String(des.decrypt("utmp", data));
	}

}