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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace VideoEncryption
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.ShowDialog();
}
private void button2_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK )
{
if (!openFileDialog1.FileName.Contains(".enc"))
{
EncryptFile(openFileDialog1.FileName, openFileDialog1.FileName + ".enc");
}
else {
System.Windows.Forms.MessageBox.Show("File already Encrypted");
}
}
else {
System.Windows.Forms.MessageBox.Show("Please select File");
}
}
private const string SKey = "_?73^?dVT3st5har3";
private const string SaltKey = "!2S@LT&KT3st5har3EY";
private const int Iterations = 1042; // Recommendation is >= 1000
public static void EncryptFile(string srcFilename, string destFilename)
{
var aes = new AesManaged();
aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
aes.KeySize = aes.LegalKeySizes[0].MaxSize;
var salt = Encoding.UTF7.GetBytes(SaltKey);
var key = new Rfc2898DeriveBytes(SKey, salt, Iterations);
aes.Key = key.GetBytes(aes.KeySize / 8);
aes.IV = key.GetBytes(aes.BlockSize / 8);
aes.Mode = CipherMode.CBC;
ICryptoTransform transform = aes.CreateEncryptor(aes.Key, aes.IV);
if (File.Exists(destFilename))
{
File.Delete(destFilename);
}
using (var dest = new FileStream(destFilename, FileMode.CreateNew, FileAccess.Write, FileShare.None))
{
using (var cryptoStream = new CryptoStream(dest, transform, CryptoStreamMode.Write))
{
using (var source = new FileStream(srcFilename, FileMode.Open, FileAccess.Read, FileShare.Read))
{
source.CopyTo(cryptoStream);
}
}
}
}
public static void DecryptFile(string srcFilename, string destFilename)
{
var tempFile = Path.GetTempFileName()+".mp4";
var aes = new AesManaged();
aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
aes.KeySize = aes.LegalKeySizes[0].MaxSize;
var salt = Encoding.UTF7.GetBytes(SaltKey);
var key = new Rfc2898DeriveBytes(SKey, salt, Iterations);
aes.Key = key.GetBytes(aes.KeySize / 8);
aes.IV = key.GetBytes(aes.BlockSize / 8);
aes.Mode = CipherMode.CBC;
ICryptoTransform transform = aes.CreateDecryptor(aes.Key, aes.IV);
if (File.Exists(@tempFile)) {
File.Delete(tempFile);
}
var dest = new FileStream(tempFile, FileMode.CreateNew, FileAccess.Write, FileShare.Read);
var cryptoStream = new CryptoStream(dest, transform, CryptoStreamMode.Write);
try {
using (var source = new FileStream(srcFilename, FileMode.Open, FileAccess.Read, FileShare.Read))
{
source.CopyTo(cryptoStream);
}
Process.Start(tempFile).WaitForExit();
}
catch (CryptographicException exception)
{
throw new ApplicationException("Decryption failed.", exception);
}
finally {
try
{
cryptoStream.Dispose();
dest.Dispose();
File.Delete(tempFile);
}
catch (Exception e) { }
}
}
private void button3_Click(object sender, EventArgs e)
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
DecryptFile(openFileDialog1.FileName, openFileDialog1.FileName.Replace(".enc", ""));
}
else {
System.Windows.Forms.MessageBox.Show("Please select File");
}
}
}
}