C#对文件进行加密解密代码

加密代码

using System;
using System.IO;
using System.Security.Cryptography;

public class Example19_9
{
 public static void Main()
 {

// Create a new file to work with
   FileStream fsOut = File.Create(@"c:\temp\encrypted.txt");

// Create a new crypto provider
   TripleDESCryptoServiceProvider tdes =
     new TripleDESCryptoServiceProvider();

// Create a cryptostream to encrypt to the filestream
   CryptoStream cs = new CryptoStream(fsOut, tdes.CreateEncryptor(),
     CryptoStreamMode.Write);

// Create a StreamWriter to format the output
   StreamWriter sw = new StreamWriter(cs);

// And write some data
   sw.WriteLine("'Twas brillig, and the slithy toves");
   sw.WriteLine("Did gyre and gimble in the wabe.");
   sw.Flush();
   sw.Close();

// save the key and IV for future use
   FileStream fsKeyOut = File.Create(@"c:\\temp\encrypted.key");

// use a BinaryWriter to write formatted data to the file
   BinaryWriter bw = new BinaryWriter(fsKeyOut);

// write data to the file
   bw.Write( tdes.Key );
   bw.Write( tdes.IV );

// flush and close
   bw.Flush();
   bw.Close();

}

}

解密代码如下

using System;
using System.IO;
using System.Security.Cryptography;

public class Example19_10
{
 public static void Main()
 {

// Create a new crypto provider
   TripleDESCryptoServiceProvider tdes =
     new TripleDESCryptoServiceProvider();

// open the file containing the key and IV
   FileStream fsKeyIn = File.OpenRead(@"c:\temp\encrypted.key");

// use a BinaryReader to read formatted data from the file
   BinaryReader br = new BinaryReader(fsKeyIn);

// read data from the file and close it
   tdes.Key = br.ReadBytes(24);
   tdes.IV = br.ReadBytes(8);

// Open the encrypted file
   FileStream fsIn = File.OpenRead(@"c:\\temp\\encrypted.txt");

// Create a cryptostream to decrypt from the filestream
   CryptoStream cs = new CryptoStream(fsIn, tdes.CreateDecryptor(),
     CryptoStreamMode.Read);

// Create a StreamReader to format the input
   StreamReader sr = new StreamReader(cs);

// And decrypt the data
   Console.WriteLine(sr.ReadToEnd());
   sr.Close();

}

}

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