c#异或的加密解密，本人计算机二级还没考的水平
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;namespace ConsoleApplication10{ class Program//总之就是问题多多，求抱大腿，看了几小时了 { static void Main(string[] args) { FileStream fs = new CzCryptStream("EncyptLetter.txt", FileMode.Create, "rose");//rose是干什么的，这个txt会被创建出来吗 StreamWriter sw = new StreamWriter(fs); sw.WriteLine("this is a letter from hollywood.外公家"); sw.Close(); fs = new FileStream("EncyptLetter.txt", FileMode.Open); StreamReader sr = new StreamReader(fs); Console.WriteLine("加密文件内容："); while (!sr.EndOfStream) Console.WriteLine(sr.ReadLine()); sr.Close(); fs = new CzCryptStream("EncyptLetter.txt", FileMode.Open,"rose"); sr = new StreamReader(fs); Console.WriteLine("\n解密文件内容："); while(!sr.EndOfStream) Console.WriteLine(sr.ReadLine()); sr.Close(); fs.Close(); } } public class CzCryptStream : FileStream { private byte[] mkey; public CzCryptStream(string spath, FileMode fmode, string skey)//fmode干嘛吃的？各种搞不懂啊！ : base(spath, fmode) { mkey = new byte[skey.Length]; for (int i = 0; i < skey.Length; i++) mkey[i] = (byte)skey[i]; } public override int ReadByte() { return base.ReadByte() ^ mkey[this.Position % mkey.Length];//Position我问度娘还是不知道什么意思啊，求解 } public override void WriteByte(byte value)//这么多事件，主方法里没见调用，这是为什么？ { value ^= mkey[this.Position % mkey.Length]; base.WriteByte(value); } public override int Read(byte[] buffer, int offset, int count) { int iLen= base.Read(buffer, offset, count); for (int i = 0; i < iLen; i++) { buffer[i]^=mkey[(offset+i)%mkey.Length]; } return iLen; } public override void Write(byte[] buffer, int offset, int count) { for (int i = 0; i < buffer.Length; i++) { buffer[i] ^= mkey[(offset + i) % mkey.Length]; } base.Write(buffer, offset, count); } }}