public void AESEncryptFile(string filePath, EncryptFileBindingModel encryptBindingModel, DecryptFileBindingModel decryptBindingModel)
{
if (SaveZoneDbService.GetAllEntitiesWithName(filePath).Count == 0)
{
decryptBindingModel.EncryptedFiles.Add(encryptBindingModel.FileName);
GenerateKey(encryptBindingModel, decryptBindingModel);
GenerateIV(encryptBindingModel, decryptBindingModel);
encryptBindingModel.FileSourcePath = filePath;
EncryptFile(filePath);
CheckUserInput(encryptBindingModel);
IV = "";
password = "";
encryptBindingModel.IsEncrypted = true;
SaveZoneDbService.AddEncryptFileInfo(encryptBindingModel.FileName, encryptBindingModel.FileSourcePath, true);
}
else
{
encryptBindingModel.IsEncrypted = false;
SaveZoneDbService.AddEncryptFileInfo(encryptBindingModel.FileName, encryptBindingModel.FileSourcePath, false);
MessageBox.Show("File already encrypted!", "File Already Encrypted", MessageBoxButtons.OK, MessageBoxIcon.Error, 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 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 AESEncryptFile(string filePath, EncryptFileBindingModel encryptBindingModel, DecryptFileBindingModel decryptBindingModel)
{
//Checks from the database if the file choosen is already encrypted. If it is stored in the database
//as an encrypted file it says that it is already encrypted.
if (SaveZoneDbService.GetAllEntitiesWithName(filePath).Count == 0)
{
//Adds to a list the file name of the file choosen.
decryptBindingModel.EncryptedFiles.Add(encryptBindingModel.FileName);
//Generates Key
GenerateKey(encryptBindingModel, decryptBindingModel);
//Generates IV
GenerateIV(encryptBindingModel, decryptBindingModel);
//Sets the source path to the binding model
encryptBindingModel.FileSourcePath = filePath;
//Encrypts the file choosen
EncryptFile(filePath);
//Checks if the user wants to save the password and the IV in a file.
CheckUserInput(encryptBindingModel);
//Resets the IV and password for next use
IV = "";
password = "";
encryptBindingModel.IsEncrypted = true;
//Adds encrypted file to the database
SaveZoneDbService.AddEncryptFileInfo(encryptBindingModel.FileName, encryptBindingModel.FileSourcePath, true);
}
else
{
encryptBindingModel.IsEncrypted = false;
SaveZoneDbService.AddEncryptFileInfo(encryptBindingModel.FileName, encryptBindingModel.FileSourcePath, false);
MessageBox.Show("File already encrypted!", "File Already Encrypted", MessageBoxButtons.OK, MessageBoxIcon.Error, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
}
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);
}
}
//Checks if user want to save the Password and the IV anywhere.
private void CheckUserInput(EncryptFileBindingModel encryptBindingModel)
{
var msgBox = MessageBox.Show($"File {encryptBindingModel.FileName} encrypted succesfully. \r\nPassword: {password} \r\nIV: {IV} \r\n\r\nDo you want to save the password and the IV in a new text file ?",
"File Encrypted", MessageBoxButtons.YesNo, MessageBoxIcon.Question, 0,
MessageBoxOptions.DefaultDesktopOnly);
//It is used if the user wants to save the password and the IV in a text file
if (msgBox == DialogResult.Yes)
{
string myDocPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + @"\GNA\EncryptedFiles";
DirectoryInfo di = Directory.CreateDirectory(myDocPath);
using (StreamWriter sw = new StreamWriter(Path.Combine(myDocPath, $"{encryptBindingModel.FileName + "-password"}.txt")))
{
sw.WriteLine($"Password: {password}");
sw.WriteLine($"IV: {IV}");
}
SaveZoneDbService.AddEncryptFileEngine(encryptBindingModel.FileSourcePath, password, IV);
MessageBox.Show($"Password and IV saved with the name {encryptBindingModel.FileName + " - password"}.txt on your startup folder of the program",
"Saved", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
//It is used when the user wants to copy the IV and the Password in the clipboard
else
{
SaveZoneDbService.AddEncryptFileEngine(encryptBindingModel.FileSourcePath, password, IV);
var saveMsgBox = MessageBox.Show("Do you want to copy password and the IV in the clipboard?",
"Copy to clipboard", MessageBoxButtons.YesNo, MessageBoxIcon.Question, 0,
MessageBoxOptions.DefaultDesktopOnly);
if (saveMsgBox == DialogResult.Yes)
{
{ Clipboard.SetText($"Password: {password} \r\nIV: {IV}"); }
MessageBox.Show("Password and IV saved to clipboard!", "Saved", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, 0,
MessageBoxOptions.DefaultDesktopOnly);
}
else
{
MessageBox.Show("Password and IV not saved", "Not saved", MessageBoxButtons.OK, MessageBoxIcon.Exclamation, 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);
}
}
