ویرایش کلاس به صورت دلخواه

[voice.of.silence]

سلام دوستان:
یک کلاس رمزنگاری فایلها رو می خوام طوری ویرایش کنم که متن رو از تکستباکس بگیره و به صورت فایل رمزنگاری شده ذخیره کنه.
کار اصلی کلاس اینه که فایل رو ازمون میگیره و به صورت رمزنگاری شده ذخیره می کنه.
با سپاس فراوان.


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Security.Cryptography;
using System.IO;


namespace AES_CryptoService
{
public class AES_Crypto_Algorithm
{


public static byte[] GenerateRandomSalt()
{
byte[] data = new byte[32];


using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
{
for (int i = 0; i < 10; i++)
{
// Fille the buffer with the generated data
rng.GetBytes(data);
}
}


return data;
}


public void FileEncrypt(string inputFile, string password)
{


//generate random salt
byte[] salt = GenerateRandomSalt();


//create output file name
FileStream fsCrypt = new FileStream(inputFile + ".aes", FileMode.Create);


//convert password string to byte arrray
byte[] passwordBytes = System.Text.Encoding.UTF8.GetBytes(password);


//Set Rijndael symmetric encryption algorithm
RijndaelManaged AES = new RijndaelManaged();
AES.KeySize = 256;
AES.BlockSize = 128;
AES.Padding = PaddingMode.PKCS7;


var key = new Rfc2898DeriveBytes(passwordBytes, salt, 50000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);


//Cipher modes: http://security.stackexchange.com/questions/52665/which-is-the-best-cipher-mode-and-padding-mode-for-aes-encryption
AES.Mode = CipherMode.CFB;


// write salt to the begining of the output file, so in this case can be random every time
fsCrypt.Write(salt, 0, salt.Length);


CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateEncryptor(), CryptoStreamMode.Write);


FileStream fsIn = new FileStream(inputFile, FileMode.Open);


//create a buffer (1mb) so only this amount will allocate in the memory and not the whole file
byte[] buffer = new byte[1048576];
int read;


try
{
while ((read = fsIn.Read(buffer, 0, buffer.Length)) > 0)
{
//Application.DoEvents(); // -> for responsive GUI, using Task will be better!
cs.Write(buffer, 0, read);
}


// Close up
fsIn.Close();
}
catch (Exception ex)
{
Console.WriteLine("Error: " + ex.Message);
}
finally
{
cs.Close();
fsCrypt.Close();
}
}


public void FileDecrypt(string inputFile, string outputFile, string password)
{
byte[] passwordBytes = System.Text.Encoding.UTF8.GetBytes(password);
byte[] salt = new byte[32];


FileStream fsCrypt = new FileStream(inputFile, FileMode.Open);
fsCrypt.Read(salt, 0, salt.Length);


RijndaelManaged AES = new RijndaelManaged();
AES.KeySize = 256;
AES.BlockSize = 128;
var key = new Rfc2898DeriveBytes(passwordBytes, salt, 50000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Padding = PaddingMode.PKCS7;
AES.Mode = CipherMode.CFB;


CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateDecryptor(), CryptoStreamMode.Read);


FileStream fsOut = new FileStream(outputFile, FileMode.Create);


int read;
byte[] buffer = new byte[1048576];


try
{
while ((read = cs.Read(buffer, 0, buffer.Length)) > 0)
{
//Application.DoEvents();
fsOut.Write(buffer, 0, read);
}
}
catch (CryptographicException ex_CryptographicException)
{
Console.WriteLine("CryptographicException error: " + ex_CryptographicException.Message);
}
catch (Exception ex)
{
Console.WriteLine("Error: " + ex.Message);
}


try
{
cs.Close();
}
catch (Exception ex)
{
Console.WriteLine("Error by closing CryptoStream: " + ex.Message);
}
finally
{
fsOut.Close();
fsCrypt.Close();
}
}


}
//end of class.


}