private void CheckUserInput(DecryptFileBindingModel decryptFileBindingModel, CheckPasswordBindingModel checkBindingModel)
{
//Checks if user has pressed OK for saving the source directory of the ecnrypted file
if (result == DialogResult.OK)
{
//Saves the encrypted file name
fileName = decryptFileDialog.FileName;
//Sets the file name of the binding model
decryptFileBindingModel.FileName = Path.GetFileName(fileName);
//Sets the source path for decrypting a file
decryptFileBindingModel.FileSourcePath = decryptFileSource = Path.GetFullPath(fileName);
//Check if a file that the user wants to be decrypted is encrypted
CheckIfFileIsEncrypted(decryptFileBindingModel, checkBindingModel);
}
}
public void AESDecryptFile(string fileName, string filePath, DecryptFileBindingModel decryptFileBindingModel, CheckPasswordBindingModel passwordBindingModel)
{
//Checks from the database if the password and the IV that the user has given matches the password and the IV of the ecnrypted file
if (passwordBindingModel.Password == SaveZoneDbService.GetEntity(filePath).encrypted_password&& passwordBindingModel.IV == SaveZoneDbService.GetEntity(filePath).encrypted_IV)
{
//Makes a byte[] of the given file so that it can be used for mixing information
//It is used by the algorithm to mix its information with the key and IV information
byte[] plainFile = File.ReadAllBytes(filePath);
//Sets an AES algorithm for decrypting file. AES is used also in ecnrypting file
using (AesCryptoServiceProvider AES = new AesCryptoServiceProvider())
{
//Sets the block information to 128 bits
AES.BlockSize = 128;
//Sets the key to 128 bits
AES.KeySize = 128;
//Uses the IV and the password that is used for encrypting the file for decrypting the file
AES.IV = Encoding.UTF8.GetBytes(SaveZoneDbService.GetEntity(filePath).encrypted_IV);
AES.Key = Encoding.UTF8.GetBytes(SaveZoneDbService.GetEntity(filePath).encrypted_password);
AES.Mode = CipherMode.CBC;
//Uses a memory stream to write to the memory. It relates to where the stream is stored
//It is used to write over a binary data with AES algorithm.
using (MemoryStream memStream = new MemoryStream())
{
//Decrypts file with CryptoStream
CryptoStream cryptoStream = new CryptoStream(memStream, AES.CreateDecryptor(), CryptoStreamMode.Write);
cryptoStream.Write(plainFile, 0, plainFile.Length);
//Cleares the block in case there is binary left
cryptoStream.FlushFinalBlock();
File.WriteAllBytes(filePath, memStream.ToArray());
}
}
//Saves the decrypted file to the database
SaveZoneDbService.AddDecryptFileEngine(filePath, filePath, SaveZoneDbService.GetEntity(filePath).encrypted_IV, SaveZoneDbService.GetEntity(filePath).encrypted_password);
//Removes the encrypted file from the database
SaveZoneDbService.RemoveFromEncrypted(filePath);
SaveZoneDbService.AddDecryptFileInfo(fileName, filePath, true);
decryptFileBindingModel.IsDecrypted = true;
MessageBox.Show("File Decrypted.", "File", MessageBoxButtons.OK, MessageBoxIcon.None, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
else
{
decryptFileBindingModel.IsDecrypted = false;
MessageBox.Show("Wrong password or IV", "Wrong Password or IV", MessageBoxButtons.OK, MessageBoxIcon.Warning, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
}
private void CheckIfFileIsEncrypted(EncryptFileServicer encryptFileServicer, DecryptFileBindingModel decryptFileBindingModel, CheckPasswordBindingModel checkBindingModel)
{
if (SaveZoneDbService.GetEntity(decryptFileBindingModel.FileSourcePath) != null)
{
if (SaveZoneDbService.GetEntity(decryptFileBindingModel.FileSourcePath).encrypted_name == decryptFileBindingModel.FileSourcePath)
{
CheckPasswordForm.ShowDialog();
if (checkBindingModel.OKIsPressed == true)
{
decryptFile.AESDecryptFile(decryptFileBindingModel.FileName, decryptFileSource, decryptFileBindingModel, checkBindingModel);
}
CheckPasswordForm.Dispose();
CheckPasswordForm = new CheckPassword();
CheckIfFileIsDecrypted(decryptFileBindingModel);
}
}
else
{
MessageBox.Show("File is not encrypted", "File not encrypted", MessageBoxButtons.OK, MessageBoxIcon.Error, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
}
private void CheckUserInput(EncryptFileServicer encryptFileServicer, DecryptFileBindingModel decryptFileBindingModel, CheckPasswordBindingModel checkBindingModel)
{
if (result == DialogResult.OK)
{
fileName = decryptFileDialog.FileName;
decryptFileBindingModel.FileName = Path.GetFileName(fileName);
decryptFileBindingModel.FileSourcePath = decryptFileSource = Path.GetFullPath(fileName);
CheckIfFileIsEncrypted(encryptFileServicer, decryptFileBindingModel, checkBindingModel);
}
}
private void CheckIfFileIsEncrypted(DecryptFileBindingModel decryptFileBindingModel, CheckPasswordBindingModel checkBindingModel)
{
//Checks from the database if the file is encrypted. If it is not the query will return null
if (SaveZoneDbService.GetEntity(decryptFileBindingModel.FileSourcePath) != null)
{
//Checks from the database if the file the user wants to decrypt matches with the encrypted file name
if (SaveZoneDbService.GetEntity(decryptFileBindingModel.FileSourcePath).encrypted_name == decryptFileBindingModel.FileSourcePath)
{
//Shows the CheckPasswordForm for the user to input password and IV for decryption.
CheckPasswordForm.ShowDialog();
//When OK is pressed on CheckPasswordForm it tries to decrypt the file if everything is done correctlly
if (checkBindingModel.OKIsPressed == true)
{
decryptFile.AESDecryptFile(decryptFileBindingModel.FileName, decryptFileSource, decryptFileBindingModel, checkBindingModel);
}
//Resets the form for next use
CheckPasswordForm.Dispose();
CheckPasswordForm = new CheckPassword();
//Checks if the file has decrypted correctlly
CheckIfFileIsDecrypted(decryptFileBindingModel);
}
}
else
{
MessageBox.Show("File is not encrypted", "File not encrypted", MessageBoxButtons.OK, MessageBoxIcon.Error, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
}
public void AESDecryptFile(string fileName, string filePath, DecryptFileBindingModel decryptFileBindingModel, CheckPasswordBindingModel passwordBindingModel)
{
if (passwordBindingModel.Password == SaveZoneDbService.GetEntity(filePath).encrypted_password&& passwordBindingModel.IV == SaveZoneDbService.GetEntity(filePath).encrypted_IV)
{
byte[] plainFile = File.ReadAllBytes(filePath);
using (AesCryptoServiceProvider AES = new AesCryptoServiceProvider())
{
AES.BlockSize = 128;
AES.KeySize = 128;
AES.IV = Encoding.UTF8.GetBytes(SaveZoneDbService.GetEntity(filePath).encrypted_IV);
AES.Key = Encoding.UTF8.GetBytes(SaveZoneDbService.GetEntity(filePath).encrypted_password);
AES.Mode = CipherMode.CBC;
using (MemoryStream memStream = new MemoryStream())
{
CryptoStream cryptoStream = new CryptoStream(memStream, AES.CreateDecryptor(), CryptoStreamMode.Write);
cryptoStream.Write(plainFile, 0, plainFile.Length);
cryptoStream.FlushFinalBlock();
File.WriteAllBytes(filePath, memStream.ToArray());
}
}
SaveZoneDbService.AddDecryptFileEngine(filePath, filePath, SaveZoneDbService.GetEntity(filePath).encrypted_IV, SaveZoneDbService.GetEntity(filePath).encrypted_password);
SaveZoneDbService.RemoveFromEncrypted(filePath);
SaveZoneDbService.AddDecryptFileInfo(fileName, filePath, true);
decryptFileBindingModel.IsDecrypted = true;
MessageBox.Show("File Decrypted.", "File", MessageBoxButtons.OK, MessageBoxIcon.None, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
else
{
decryptFileBindingModel.IsDecrypted = false;
MessageBox.Show("Wrong password or IV", "Wrong Password or IV", MessageBoxButtons.OK, MessageBoxIcon.Warning, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
}
private static void SetCancelIsPressed(CheckPassword CheckForm, CheckPasswordBindingModel checkPasswordBindingModel)
{
checkPasswordBindingModel.CancelIsPressed = true;
CheckForm.Close();
}
private static void SetCheckPasswordBindingModel(string textBoxText, string textBox2Text, CheckPasswordBindingModel checkPasswordBindingModel)
{
//Sets the password and the IV of the CheckPasswordBindingModel bindingModel.
checkPasswordBindingModel.Password = textBoxText;
checkPasswordBindingModel.IV = textBox2Text;
}
private static void SetCheckFileBindingModelOKIsPressed(CheckPasswordBindingModel checkPasswordBindingModel)
{
//Uses CheckPassword Form to close the specific form.
//Uses CheckPasswordBindingModel to set that cancel is pressed on that form.
checkPasswordBindingModel.OKIsPressed = true;
}
//Syncronous method of SetCancelIsPressedAsync
public static void SetCancelIsPressedNonAsync(CheckPassword CheckForm, CheckPasswordBindingModel checkPasswordBindingModel)
{
SetCancelIsPressed(CheckForm, checkPasswordBindingModel);
}
public static async void SetCancelIsPressedAsync(CheckPassword CheckForm, CheckPasswordBindingModel checkPasswordBindingModel)
{
//Uses CheckPassword Form to close the specific form.
//Uses CheckPasswordBindingModel to set that cancel is pressed on that form.
await Task.Run(() => SetCancelIsPressed(CheckForm, checkPasswordBindingModel));
}
//Syncronous method of CheckIfTextBoxIsEmptyAsync
public static void CheckIfTextBoxIsEmptyNonAsync(string textBoxText, string textBox2Text, CheckPassword CheckForm, CheckPasswordBindingModel checkPasswordBindingModel)
{
if (textBoxText != "" && textBox2Text != "")
{
SetCheckPasswordBindingModel(textBoxText, textBox2Text, checkPasswordBindingModel);
SetCheckFileBindingModelOKIsPressed(checkPasswordBindingModel);
CheckForm.Close();
}
else
{
ShowMessageBox();
}
}
public static async void CheckIfTextBoxIsEmptyAsync(string textBoxText, string textBox2Text, CheckPassword CheckForm, CheckPasswordBindingModel checkPasswordBindingModel)
{
//uses string textBoxText and textBox2Text to get user input for the password and the IV for decryption.
//uses CheckPassword Form to close the specific Form
//uses CheckPasswordBindingModel to set its properties.
if (textBoxText != "" && textBox2Text != "")
{
await Task.Run(() => SetCheckPasswordBindingModel(textBoxText, textBox2Text, checkPasswordBindingModel));
await Task.Run(() => SetCheckFileBindingModelOKIsPressed(checkPasswordBindingModel));
CheckForm.Close();
}
else
{
await Task.Run(() => ShowMessageBox());
}
}
