private static void CompleteDecryption(string filePath, string decryptedFilePath) { // Deanonymise file name OriginalFileName.RestoreOriginalFileName(decryptedFilePath); FileHandling.DeleteFile(filePath); Globals.ResultsText += $"{Path.GetFileName(filePath)}: File decryption successful.{Environment.NewLine}"; Globals.SuccessfulCount += 1; }
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); }
public static void GetFilePaths(bool encryption, byte[] passwordBytes, BackgroundWorker backgroundWorker) { int progress = 0; Globals.SuccessfulCount = 0; Globals.TotalCount = Globals.GetSelectedFiles().Count; foreach (string filePath in Globals.GetSelectedFiles()) { bool?fileIsDirectory = FileHandling.IsDirectory(filePath); if (fileIsDirectory != null) { if (fileIsDirectory == false) { CallEncryption(encryption, filePath, passwordBytes, ref progress, backgroundWorker); } else { DirectoryEncryption(encryption, filePath, passwordBytes, ref progress, backgroundWorker); } } } }
private static void DecryptFile(string filePath, int parametersLength, byte[] macBackup, byte[] encryptionKey, BackgroundWorker bgwDecryption) { try { string decryptedFilePath = Regex.Replace(filePath, Constants.EncryptedExtension, string.Empty); int headersLength = Constants.SaltLength + parametersLength; using (var plaintext = new FileStream(decryptedFilePath, FileMode.Create, FileAccess.ReadWrite, FileShare.Read, Constants.FileBufferSize, FileOptions.SequentialScan)) using (var ciphertext = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.Read, Constants.FileBufferSize, FileOptions.SequentialScan)) { // Skip the header bytes ciphertext.Seek(headersLength, SeekOrigin.Begin); byte[] fileBytes = FileHandling.GetBufferSize(ciphertext.Length); // Generate a counter starting at 0 byte[] counter = Generate.Counter(); int bytesRead; MemoryEncryption.DecryptByteArray(ref encryptionKey); while ((bytesRead = ciphertext.Read(fileBytes, 0, fileBytes.Length)) > 0) { byte[] decryptedBytes = StreamEncryption.DecryptXChaCha20(fileBytes, counter, encryptionKey); plaintext.Write(decryptedBytes, 0, bytesRead); counter = Sodium.Utilities.Increment(counter); // Report progress if decrypting a single file ReportProgress.ReportEncryptionProgress(plaintext.Position, ciphertext.Length, bgwDecryption); } Utilities.ZeroArray(encryptionKey); } CompleteDecryption(filePath, decryptedFilePath); } catch (Exception ex) when(ExceptionFilters.FileEncryptionExceptions(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(encryptionKey); RestoreMAC(filePath, macBackup); } }
private static void EncryptFile(string filePath, string encryptedFilePath, byte[] salt, byte[] encryptionKey, byte[] macKey, BackgroundWorker bgwEncryption) { try { using (var ciphertext = new FileStream(encryptedFilePath, FileMode.Create, FileAccess.ReadWrite, FileShare.Read, Constants.FileBufferSize, FileOptions.SequentialScan)) using (var plaintext = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.Read, Constants.FileBufferSize, FileOptions.SequentialScan)) { WriteFileHeaders.WriteHeaders(ciphertext, salt); // Store headers length to correct percentage calculation long headersLength = ciphertext.Position; byte[] fileBytes = FileHandling.GetBufferSize(plaintext.Length); // Generate a counter starting at 0 byte[] counter = Generate.Counter(); int bytesRead; MemoryEncryption.DecryptByteArray(ref encryptionKey); while ((bytesRead = plaintext.Read(fileBytes, 0, fileBytes.Length)) > 0) { byte[] encryptedBytes = StreamEncryption.EncryptXChaCha20(fileBytes, counter, encryptionKey); ciphertext.Write(encryptedBytes, 0, bytesRead); counter = Sodium.Utilities.Increment(counter); // Report progress if encrypting a single file ReportProgress.ReportEncryptionProgress(ciphertext.Position, plaintext.Length + headersLength, bgwEncryption); } } Utilities.ZeroArray(encryptionKey); CompleteEncryption(filePath, encryptedFilePath, macKey); } catch (Exception ex) when(ExceptionFilters.FileEncryptionExceptions(ex)) { Logging.LogException(ex.ToString(), Logging.Severity.High); DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to encrypt the file."); FileHandling.DeleteFile(encryptedFilePath); Utilities.ZeroArray(encryptionKey); Utilities.ZeroArray(macKey); } }