public static void MakeFileReadOnly(string filePath)
{
try
{
File.SetAttributes(filePath, FileAttributes.ReadOnly);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Medium);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to make the file read-only.");
}
}
private static string[] GetAllDirectories(string folderPath)
{
try
{
return(Directory.GetDirectories(folderPath, "*", SearchOption.AllDirectories));
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(folderPath, ex.GetType().Name, "Unable to get subdirectories in selected folder.");
return(null);
}
}
private static bool?LoadBooleanSetting(string setting)
{
try
{
return(Invariant.ToBoolean(setting));
}
catch (Exception ex) when(ExceptionFilters.SettingsExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Low);
DisplayMessage.ErrorMessageBox(ex.GetType().Name, $"Unable to load {setting} setting. The default setting will be used.");
return(null);
}
}
public static void OverwriteFile(string fileToDelete, string fileToCopy)
{
try
{
File.Copy(fileToCopy, fileToDelete, true);
File.Delete(fileToDelete);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Medium);
DisplayMessage.ErrorResultsText(fileToDelete, ex.GetType().Name, "Unable to overwrite and/or delete.");
}
}
public static void EraseFileMetadata(string filePath)
{
try
{
var eraseDate = new DateTime(2001, 11, 26, 12, 0, 0);
File.SetCreationTime(filePath, eraseDate);
File.SetLastWriteTime(filePath, eraseDate);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Medium);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Erasure of file metadata failed.");
}
}
public static void SetClipboard(string text)
{
try
{
if (!string.IsNullOrEmpty(text))
{
Clipboard.SetText(text);
}
}
catch (Exception ex) when(ExceptionFilters.ClipboardExceptions(ex))
{
DisplayMessage.ErrorMessageBox(ex.GetType().Name, "Unable to copy text to the clipboard.");
}
}
public static void LogException(string exceptionMessage, Severity severity)
{
try
{
const string logFileName = "error log.txt";
string logFilePath = Path.Combine(Constants.KryptorDirectory, logFileName);
string logMessage = $"[Error] Severity = {severity}" + Environment.NewLine + exceptionMessage + Environment.NewLine;
File.AppendAllText(logFilePath, logMessage);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
DisplayMessage.ErrorMessageBox(ex.GetType().Name, "Unable to log exception.");
}
}
private static int GetFileNameLength(string filePath, string originalFileName)
{
try
{
EncodeFileName(filePath, originalFileName, out byte[] newLineBytes, out byte[] fileNameBytes);
return(newLineBytes.Length + fileNameBytes.Length);
}
catch (Exception ex) when(ExceptionFilters.CharacterEncodingExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to remove the original file name stored in the file. The length of the stored file name could not be calculated.");
return(0);
}
}
public static bool?IsDirectory(string filePath)
{
try
{
var fileAttributes = File.GetAttributes(filePath);
return(fileAttributes.HasFlag(FileAttributes.Directory));
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to check if file path is a directory.");
return(null);
}
}
private static char[] EncryptPassword(byte[] plaintext, byte[] publicKey)
{
try
{
byte[] ciphertext = SealedPublicKeyBox.Create(plaintext, publicKey);
return(Convert.ToBase64String(ciphertext).ToCharArray());
}
catch (Exception ex) when(ExceptionFilters.PasswordSharingExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Low);
GetErrorMessage(ex, "Encryption");
return(Array.Empty <char>());
}
}
public static void DeleteFile(string filePath)
{
try
{
if (File.Exists(filePath))
{
File.Delete(filePath);
}
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Medium);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to delete the file.");
}
}
private static void DeleteFile(string filePath)
{
try
{
string anonymisedFilePath = AnonymousRename.MoveFile(filePath, true);
EraseFileMetadata(anonymisedFilePath);
File.Delete(anonymisedFilePath);
Globals.ResultsText += $"{Path.GetFileName(filePath)}: File erasure successful." + Environment.NewLine;
Globals.SuccessfulCount += 1;
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to delete the file.");
}
}
public static string ReadOriginalFileName(string filePath)
{
try
{
// Read the last line of the decrypted file
string originalFileName = File.ReadLines(filePath).Last().Trim('\0');
RemoveStoredFileName(filePath, originalFileName);
return(originalFileName);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex) || ex is InvalidOperationException)
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to read original file name.");
return(string.Empty);
}
}
private static char[] DecryptPassword(byte[] ciphertext, byte[] privateKey)
{
try
{
using (var keyPair = PublicKeyBox.GenerateKeyPair(privateKey))
{
byte[] plaintext = SealedPublicKeyBox.Open(ciphertext, keyPair);
return(Encoding.UTF8.GetChars(plaintext));
}
}
catch (Exception ex) when(ExceptionFilters.PasswordSharingExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Low);
GetErrorMessage(ex, "Decryption");
return(Array.Empty <char>());
}
}
public static (byte[], byte[], byte[]) GetParametersBytes(string memorySize, string iterations)
{
try
{
Encoding encoding = Encoding.UTF8;
byte[] memorySizeBytes = encoding.GetBytes(memorySize);
byte[] iterationsBytes = encoding.GetBytes(iterations);
byte[] endFlagBytes = encoding.GetBytes(Constants.EndFlag);
return(memorySizeBytes, iterationsBytes, endFlagBytes);
}
catch (Exception ex) when(ExceptionFilters.CharacterEncodingExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(string.Empty, ex.GetType().Name, "Unable to convert Argon2 parameters to bytes.");
return(null, null, null);
}
}
private static bool GenerateKeyfile(string filePath)
{
try
{
byte[] keyfileBytes = SodiumCore.GetRandomBytes(Constants.MACKeySize);
File.WriteAllBytes(filePath, keyfileBytes);
File.SetAttributes(filePath, FileAttributes.ReadOnly);
Utilities.ZeroArray(keyfileBytes);
return(true);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Medium);
DisplayMessage.ErrorMessageBox(ex.GetType().Name, "Unable to generate keyfile.");
return(false);
}
}
public static bool AppendHash(string filePath, byte[] fileHash)
{
try
{
NullChecks.ByteArray(fileHash);
using (var fileStream = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.Read))
{
fileStream.Write(fileHash, 0, fileHash.Length);
}
return(true);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to append the MAC to the file. This data is required for decryption of the file.");
return(false);
}
}
public static void BackgroundWorkerReportProgress(long progress, long total, BackgroundWorker backgroundWorker)
{
try
{
NullChecks.BackgroundWorkers(backgroundWorker);
int percentage = (int)Math.Round((double)((double)progress / total) * 100);
// Prevent unnecessary calls
if (percentage != 0 && percentage != _previousPercentage)
{
backgroundWorker.ReportProgress(percentage);
}
_previousPercentage = percentage;
}
catch (Exception ex) when(ExceptionFilters.ReportProgressExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Bug);
DisplayMessage.ErrorResultsText(string.Empty, ex.GetType().Name, "Background worker report progress exception. This is a bug - please report it.");
}
}
public static void DeleteFirstRunFile()
{
const string firstRunFile = "first run.tmp";
try
{
// Prevent Argon2 benchmark reoccuring automatically
string firstRunFilePath = Path.Combine(Constants.KryptorDirectory, firstRunFile);
if (File.Exists(firstRunFilePath))
{
File.Delete(firstRunFilePath);
}
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Medium);
DisplayMessage.ErrorMessageBox(ex.GetType().Name, $"Unable to delete {Constants.KryptorDirectory}\\{firstRunFile}. Please manually delete this file to prevent the Argon2 benchmark from automatically running again.");
}
}
private static byte[] ReadHeader(string filePath, int headerLength, int offset)
{
try
{
byte[] header = new byte[headerLength];
using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
fileStream.Seek(offset, SeekOrigin.Begin);
fileStream.Read(header, 0, header.Length);
}
return(header);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to read salt or nonce from the selected file.");
return(null);
}
}
private static string AnonymiseDirectoryName(string folderPath)
{
try
{
string originalDirectoryName = Path.GetFileName(folderPath);
string anonymisedPath = GetAnonymousFileName(folderPath);
Directory.Move(folderPath, anonymisedPath);
// Store the original directory name in a text file inside the directory
string storageFilePath = Path.Combine(anonymisedPath, $"{Path.GetFileName(anonymisedPath)}.txt");
File.WriteAllText(storageFilePath, originalDirectoryName);
return(anonymisedPath);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(folderPath, ex.GetType().Name, "Unable to anonymise directory name.");
return(folderPath);
}
}
private static void RemoveStoredFileName(string filePath, string originalFileName)
{
try
{
int removeLength = GetFileNameLength(filePath, originalFileName);
if (removeLength != 0)
{
using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.Read))
{
fileStream.SetLength(fileStream.Length - removeLength);
}
}
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to remove the original file name stored in the decrypted file. The file should be decrypted, but there is a leftover string at the end of the file.");
}
}
public static void SaveSettings()
{
try
{
if (File.Exists(_settingsFile))
{
var settings = new Dictionary <string, string>
{
{ "Encryption Algorithm", Invariant.ToString(Globals.EncryptionAlgorithm) },
{ "Memory Encryption", Globals.MemoryEncryption.ToString() },
{ "Anonymous Rename", Globals.AnonymousRename.ToString() },
{ "Overwrite Files", Globals.OverwriteFiles.ToString() },
{ "Argon2 Memory Size", Invariant.ToString(Globals.MemorySize) },
{ "Argon2 Iterations", Invariant.ToString(Globals.Iterations) },
{ "Show Password", Globals.ShowPasswordByDefault.ToString() },
{ "Auto Clear Password", Globals.AutoClearPassword.ToString() },
{ "Auto Clear Clipboard", Invariant.ToString(Globals.ClearClipboardInterval) },
{ "Exit Clipboard Clear", Globals.ExitClearClipboard.ToString() },
{ "Shred Files Method", Invariant.ToString(Globals.ShredFilesMethod) },
{ "Check for Updates", Globals.CheckForUpdates.ToString() },
{ "Dark Theme", Globals.DarkTheme.ToString() }
};
using (var streamWriter = new StreamWriter(_settingsFile))
{
foreach (var keyValuePair in settings)
{
streamWriter.WriteLine($"{keyValuePair.Key}: {keyValuePair.Value}");
}
}
}
else
{
File.Create(_settingsFile).Close();
SaveSettings();
}
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorMessageBox(ex.GetType().Name, "Unable to save settings.");
}
}
public static void BackupSettings()
{
try
{
using (var selectFolderDialog = new VistaFolderBrowserDialog())
{
selectFolderDialog.Description = "Settings Backup";
if (selectFolderDialog.ShowDialog() == DialogResult.OK)
{
string backupFile = Path.Combine(selectFolderDialog.SelectedPath, Path.GetFileName(_settingsFile));
File.Copy(_settingsFile, backupFile, true);
}
}
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Low);
DisplayMessage.ErrorMessageBox(ex.GetType().Name, "Unable to backup settings file.");
}
}
public static bool AppendOriginalFileName(string filePath)
{
try
{
string fileName = Path.GetFileName(filePath);
EncodeFileName(filePath, fileName, out byte[] newLineBytes, out byte[] fileNameBytes);
using (var fileStream = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.Read))
{
fileStream.Write(newLineBytes, 0, newLineBytes.Length);
fileStream.Write(fileNameBytes, 0, fileNameBytes.Length);
}
return(true);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex) || ex is EncoderFallbackException)
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Could not store original file name.");
return(false);
}
}
private static byte[] ComputeFileHash(string encryptedFilePath, byte[] macKey)
{
try
{
byte[] computedHash = new byte[Constants.HashLength];
using (var fileStream = new FileStream(encryptedFilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
MemoryEncryption.DecryptByteArray(ref macKey);
computedHash = HashingAlgorithms.Blake2(fileStream, macKey);
MemoryEncryption.EncryptByteArray(ref macKey);
}
return(computedHash);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(encryptedFilePath, ex.GetType().Name, "Unable to compute MAC.");
return(null);
}
}
private static byte[] ReadStoredHash(string filePath)
{
try
{
byte[] storedHash = new byte[Constants.HashLength];
using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
// Read the last 64 bytes of the file
fileStream.Seek(fileStream.Length - storedHash.Length, SeekOrigin.Begin);
fileStream.Read(storedHash, 0, storedHash.Length);
}
return(storedHash);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to read the MAC stored in the file.");
return(null);
}
}
private static void CallShredFilesMethod(string filePath, ref int progress, BackgroundWorker bgwShredFiles)
{
try
{
File.SetAttributes(filePath, FileAttributes.Normal);
switch (Globals.ShredFilesMethod)
{
case 0:
ShredFilesMethods.FirstLast16KiB(filePath);
break;
case 1:
// false = use zeros, not ones (used in Infosec Standard 5 Enhanced)
ShredFilesMethods.ZeroFill(filePath, false, bgwShredFiles);
break;
case 2:
ShredFilesMethods.PseudorandomData(filePath, bgwShredFiles);
break;
case 3:
ShredFilesMethods.EncryptionErasure(filePath, bgwShredFiles);
break;
case 4:
ShredFilesMethods.InfosecStandard5Enhanced(filePath, bgwShredFiles);
break;
case 5:
ShredFilesMethods.PseudorandomData5Passes(filePath, bgwShredFiles);
break;
}
DeleteFile(filePath);
ReportProgress.IncrementProgress(ref progress, bgwShredFiles);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "Unable to set file attributes to normal. This file has not been shredded.");
}
}
public static void PseudorandomData(string filePath, BackgroundWorker bgwShredFiles)
{
try
{
using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.Read))
{
byte[] randomBytes = FileHandling.GetBufferSize(fileStream);
while (fileStream.Position < fileStream.Length)
{
randomBytes = SodiumCore.GetRandomBytes(randomBytes.Length);
fileStream.Write(randomBytes, 0, randomBytes.Length);
ReportProgress.ReportEncryptionProgress(fileStream.Position, fileStream.Length, bgwShredFiles);
}
}
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.High);
DisplayMessage.ErrorResultsText(filePath, ex.GetType().Name, "'1 Pass' erasure failed.");
}
}
public static byte[] ReadKeyfile(string keyfilePath)
{
try
{
File.SetAttributes(keyfilePath, FileAttributes.Normal);
byte[] keyfileBytes = new byte[Constants.MACKeySize];
// Read the first 64 bytes of a keyfile
using (var fileStream = new FileStream(keyfilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
fileStream.Read(keyfileBytes, 0, keyfileBytes.Length);
}
File.SetAttributes(keyfilePath, FileAttributes.ReadOnly);
return(keyfileBytes);
}
catch (Exception ex) when(ExceptionFilters.FileAccessExceptions(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Medium);
DisplayMessage.ErrorResultsText(string.Empty, ex.GetType().Name, "Unable to read keyfile. The selected keyfile has not been used.");
return(null);
}
}