/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/


/*
  Example19_8.cs illustrates declarative role-based security
*/

using System;
using System.IO;
using System.Security.Permissions;

[PrincipalPermissionAttribute(SecurityAction.Demand, Role="Administrators")]
public class Example19_8 
{
    public static void Main() 
    {

        // Create a new file to work with
        FileStream fsOut = File.Create(@"c:	emp	est.txt");
        // Create a StreamWriter to handle writing
        StreamWriter sw = new StreamWriter(fsOut);
        // 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();

    }
}
           
          

   

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
  Example19_9.cs illustrates encrypting a file
*/

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:	empencrypted.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:	empencrypted.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();

    }

}




           
          

   

/*
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:	empencrypted.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:	empencrypted.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();

    }

}




           
          

/*
Mastering Visual C# .NET
by Jason Price, Mike Gunderloy

Publisher: Sybex;
ISBN: 0782129110
*/

/*
Example19_11.cs illustrates asymmetric cryptography
*/

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

public class Example19_11
{
public static void Main()
{

// Create a new crypto provider
RSACryptoServiceProvider rsa =
new RSACryptoServiceProvider();

// Data to encrypt
Byte[] testData = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

// Encrypt the data
Byte[] encryptedData = rsa.Encrypt(testData, false);
Console.WriteLine(“Encrypted data:”);
for(int i=0; i

   

using System;
using System.IO;

  class Class1 {
    static void Main(string[] args) {
      string [] cla  = Environment.GetCommandLineArgs();
      if (cla.GetUpperBound(0) == 2)
      {
        FileInfo fi = new FileInfo(cla[1]);
        fi.MoveTo(cla[2]);
        Console.WriteLine("File Created : " + fi.CreationTime.ToString());
        Console.WriteLine("Moved to     : " + cla[2]);
      }
      else
        Console.WriteLine ("Usage: mv <source file> <destination file>");
    }
  }


           
          

   

using System;
using System.IO;


  class Class1 {
    static void Main(string[] args) {
      string [] cla  = Environment.GetCommandLineArgs();
      if (cla.GetUpperBound(0) == 1)
      {
        FileInfo fi = new FileInfo(cla[1]);
        fi.Delete();
        Console.WriteLine("File      : " + cla[1]);
        Console.WriteLine("Attributes: " + fi.Attributes.ToString());
        Console.WriteLine("File Deleted...");
      }
      else
        Console.WriteLine ("Usage: rm <filename>");
    }
  }


           
          

   


using System;
using System.IO;

  class Class1 {
    static void Main(string[] args) {
      string [] cla  = Environment.GetCommandLineArgs();
      if (cla.GetUpperBound(0) == 2) {
        FileInfo fi = new FileInfo(cla[1]);
        fi.CopyTo(cla[2],true);
        Console.WriteLine("Copied " + fi.Length + " bytes.");
      }
      else{
        Console.WriteLine ("Usage: cp <input file> <output file>");
      }
    }
  }