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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