public static void CreateKeyfile(string filePath)
{
NullChecks.Strings(filePath);
const string keyfileExtension = ".key";
// Generate a random name if the path is a directory
if (Directory.Exists(filePath))
{
string randomFileName = AnonymousRename.GenerateRandomFileName() + keyfileExtension;
filePath = Path.Combine(filePath, randomFileName);
}
if (!File.Exists(filePath))
{
// Append .key extension if missing
if (!filePath.EndsWith(keyfileExtension, StringComparison.InvariantCulture))
{
filePath += keyfileExtension;
}
Keyfiles.GenerateKeyfile(filePath);
}
else
{
Console.WriteLine("Error: A file with this name already exists.");
}
}
public static string KeyfilePath(string keyfilePath)
{
try
{
const string keyfileExtension = ".key";
// Generate a random keyfile
if (Directory.Exists(keyfilePath))
{
string randomFileName = ObfuscateFileName.GetRandomFileName() + keyfileExtension;
keyfilePath = Path.Combine(keyfilePath, randomFileName);
}
// Append keyfile extension if missing
if (!keyfilePath.EndsWith(keyfileExtension, StringComparison.InvariantCulture))
{
keyfilePath += keyfileExtension;
}
Keyfiles.GenerateKeyfile(keyfilePath);
return(keyfilePath);
}
catch (Exception ex) when(ExceptionFilters.FileAccess(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Error);
DisplayMessage.FilePathException(keyfilePath, ex.GetType().Name, "Unable to randomly generate keyfile.");
return(null);
}
}
private static byte[] UseKeyfile(byte[] passwordBytes, string keyfilePath)
{
try
{
byte[] keyfileBytes = Keyfiles.ReadKeyfile(keyfilePath);
return(passwordBytes == null ? keyfileBytes : CombineKeyfileAndPassword(passwordBytes, keyfileBytes));
}
catch (Exception ex) when(ExceptionFilters.FileAccess(ex))
{
DisplayMessage.Exception(ex.GetType().Name, "Unable to read keyfile. The keyfile has not been used.");
return(passwordBytes);
}
}
private static byte[] GetKeyfileBytes(byte[] passwordBytes, string keyfilePath)
{
if (!string.IsNullOrEmpty(keyfilePath))
{
byte[] keyfileBytes = Keyfiles.ReadKeyfile(keyfilePath);
if (keyfileBytes != null)
{
MemoryEncryption.DecryptByteArray(ref passwordBytes);
// Combine password and keyfile bytes
passwordBytes = HashingAlgorithms.Blake2(passwordBytes, keyfileBytes);
MemoryEncryption.EncryptByteArray(ref passwordBytes);
Utilities.ZeroArray(keyfileBytes);
}
}
return(passwordBytes);
}
private static byte[] KeyfileAsPassword(string keyfilePath)
{
// If only a keyfile was selected, use the keyfile bytes as the password
byte[] passwordBytes = Keyfiles.ReadKeyfile(keyfilePath);
return(HashPasswordBytes(passwordBytes));
}