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);
} }
}
再问,这程序里的密钥怎么产生的??安全吗?有没有根据这个方法编个程序然后直接发送密文,由程序解密的程序?
...........
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);
} }
}
再问,这程序里的密钥怎么产生的??安全吗?有没有根据这个方法编个程序然后直接发送密文,由程序解密的程序?
...........
2.fmode是用于初始化FileStream
3.见FileStream.Position
4.FileStream会在写入时间接调用这些方法
5.密钥是那个rose,注意到这里密钥只能用ASCII字符
6.任何将密钥硬编码在程序中的行为都是愚蠢的
7.不想写到文件里的话,可以改为继承MemoryStream