Decrypting a file : Encrypt Decrypt File « File Directory Stream « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. File Directory Stream
3. Encrypt Decrypt File

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

class MainClass
{
  public static void Main() 
  {
    TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();

    FileStream fsKeyIn = File.OpenRead(@"c:\encrypted.key");
    
    BinaryReader br = new BinaryReader(fsKeyIn);

    tdes.Key = br.ReadBytes(24);
    tdes.IV = br.ReadBytes(8);

    FileStream fsIn = File.OpenRead(@"c:\encrypted.txt");

    CryptoStream cs = new CryptoStream(fsIn, tdes.CreateDecryptor(),CryptoStreamMode.Read);

    StreamReader sr = new StreamReader(cs);

    Console.WriteLine(sr.ReadToEnd());
    sr.Close();
  }
}

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