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/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy
Publisher: Sybex;
ISBN: 0782129110
*/
/*
Example19_10.cs illustrates decrypting a file
*/
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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