//***************************************************************************************
//?Autor:Tecky
//?Date:2008-06-03
//?Desc:xxtea?算法的C#加密實現
//?e-mail:likui318@163.com
//
//
//***************************************************************************************
using?System;

class?XXTEA
{
????public?static?string?Encrypt（string?source?string?key）
????{
????????System.Text.Encoding?encoder?=?System.Text.Encoding.UTF8;
????????//UTF8==>base64==>XXTEA==>base64
????????byte[]?bytData?=?encoder.GetBytes（base64Encode（source））;
????????byte[]?bytKey?=?encoder.GetBytes（key）;
????????if?（bytData.Length?==?0）
????????{
????????????return?““;
????????}
????????return?System.Convert.Tobase64String（ToByteArray（Encrypt（ToUInt32Array（bytData?true）?ToUInt32Array（bytKey?false））?false））;
????}
????public?static?string?Decrypt（string?source?string?key）
????{
????????if?（source.Length?==?0）
????????{
????????????return?““;
????????}
????????//?reverse
????????System.Text.Encoding?encoder?=?System.Text.Encoding.UTF8;
????????byte[]?bytData?=?System.Convert.Frombase64String（source）;
????????byte[]?bytKey?=?encoder.GetBytes（key）;

????????return?base64Decode（encoder.GetString（ToByteArray（Decrypt（ToUInt32Array（bytData?false）?ToUInt32Array（bytKey?false））?true）））;
????}

????private?static?UInt32[]?Encrypt（UInt32[]?v?UInt32[]?k）
????{
????????Int32?n?=?v.Length?-?1;
????????if?（n?????????{
????????????return?v;
????????}
????????if?（k.Length?????????{
????????????UInt32[]?Key?=?new?UInt32[4];
????????????k.CopyTo（Key?0）;
????????????k?=?Key;
????????}
????????UInt32?z?=?v[n]?y?=?v[0]?delta?=?0x9E3779B9?sum?=?0?e;
????????Int32?p?q?=?6?+?52?/?（n?+?1）;
????????while?（q--?>?0）
????????{
????????????sum?=?unchecked（sum?+?delta）;
????????????e?=?sum?>>?2?&?3;
????????????for?（p?=?0;?p?????????????{
????????????????y?=?v[p?+?1];
????????????????z?=?unchecked（v[p]?+=?（z?>>?5?^?y?<>?3?^?z?<????????????}
????????????y?=?v[0];
????????????z?=?unchecked（v[n]?+=?（z?>>?5?^?y?<>?3?^?z?<????????}
????????return?v;
????}

????private?static?UInt32[]?Decrypt（UInt32[]?v?UInt32[]?k）
????{
????????Int32?n?=?v.Length?-?1;
????????if?（n?????????{
????????????return?v;
????????}
????????if?（k.Length?????????{
????????????UInt32[]?Key?=?new?UInt32[4];
????????????k.CopyTo（Key?0）;
????????????k?=?Key;
????????}
????????UInt32?z?=?v[n]?y?=?v[0]?delta?=?0x9E3779B9?sum?e;
????????Int32?p?q?=?6?+?52?/?（n?+?1）;
????????sum?=?unchecked（（UInt32）（q?*?delta））;
????????while?（sum?!=?0）
????????{
????????????e?=?sum?>>?2?&?3;
????????????for?（p?=?n;?p?>?0;?p--）
????????????{
????????????????z?=?v[p?-?1];
????????????????y?=?unchecked（v[p]?-=?（z?>>?5?^?y?<>?3?^?z?<????????????}
????????????z?=?v[n];
????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????8084??2008-09-01?16:13??xxtea.js

?????文件???????5154??2008-09-01?16:15??xxtea.cs

?????文件???????4980??2008-07-23?11:52??jsPoint.htm

-----------?---------??----------?-----??----

????????????????18218????????????????????3