private static void CompleteEncryption(string filePath, string encryptedFilePath, byte[] macKey)
{
// Calculate and append MAC
bool fileSigned = FileAuthentication.SignFile(encryptedFilePath, macKey);
Utilities.ZeroArray(macKey);
if (fileSigned == true && Globals.OverwriteFiles == true)
{
FileHandling.OverwriteFile(filePath, encryptedFilePath);
}
FileHandling.MakeFileReadOnly(encryptedFilePath);
GetEncryptionResult(filePath, fileSigned);
}
private static void CheckForTampering(string filePath, int parametersLength, byte[] encryptionKey, byte[] macKey, BackgroundWorker bgwDecryption)
{
bool fileTampered = FileAuthentication.AuthenticateFile(filePath, macKey, out byte[] macBackup);
Utilities.ZeroArray(macKey);
if (fileTampered == false)
{
DecryptFile(filePath, parametersLength, macBackup, encryptionKey, bgwDecryption);
}
else
{
Globals.ResultsText += $"{Path.GetFileName(filePath)}: Incorrect password/keyfile or this file has been tampered with.{Environment.NewLine}";
Utilities.ZeroArray(encryptionKey);
}
}
private static void RestoreMAC(string filePath, byte[] macBackup)
{
bool restored = FileAuthentication.AppendHash(filePath, macBackup);
if (restored == false)
{
try
{
File.WriteAllBytes($"{filePath}.backup", macBackup);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Failed to backup the MAC. This data is required for decryption.");
}
}
Utilities.ZeroArray(macBackup);
}
