private static void UsingPrivateKey(string inputFilePath, byte[] sharedSecret, byte[] recipientPrivateKey)
{
try
{
bool fileIsDirectory = FileHandling.IsDirectory(inputFilePath);
if (fileIsDirectory)
{
DirectoryDecryption.UsingPrivateKey(inputFilePath, sharedSecret, recipientPrivateKey);
return;
}
byte[] ephemeralPublicKey = FileHeaders.ReadEphemeralPublicKey(inputFilePath);
byte[] ephemeralSharedSecret = KeyExchange.GetSharedSecret(recipientPrivateKey, ephemeralPublicKey);
byte[] salt = FileHeaders.ReadSalt(inputFilePath);
byte[] keyEncryptionKey = Generate.KeyEncryptionKey(sharedSecret, ephemeralSharedSecret, salt);
string outputFilePath = GetOutputFilePath(inputFilePath);
DecryptFile.Initialize(inputFilePath, outputFilePath, keyEncryptionKey);
Utilities.ZeroArray(keyEncryptionKey);
DecryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.FileAccess(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Error);
if (ex is ArgumentException || ex is ArgumentOutOfRangeException)
{
DisplayMessage.FilePathMessage(inputFilePath, ex.Message);
return;
}
DisplayMessage.FilePathException(inputFilePath, ex.GetType().Name, "Unable to decrypt the file.");
}
}
private static void UsingPassword(string inputFilePath, byte[] passwordBytes)
{
try
{
bool fileIsDirectory = FileHandling.IsDirectory(inputFilePath);
if (fileIsDirectory)
{
DirectoryDecryption.UsingPassword(inputFilePath, passwordBytes);
return;
}
byte[] salt = FileHeaders.ReadSalt(inputFilePath);
byte[] keyEncryptionKey = Argon2.DeriveKey(passwordBytes, salt);
string outputFilePath = GetOutputFilePath(inputFilePath);
DecryptFile.Initialize(inputFilePath, outputFilePath, keyEncryptionKey);
Utilities.ZeroArray(keyEncryptionKey);
DecryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.FileAccess(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Error);
if (ex is ArgumentException || ex is ArgumentOutOfRangeException)
{
DisplayMessage.FilePathMessage(inputFilePath, ex.Message);
return;
}
DisplayMessage.FilePathException(inputFilePath, ex.GetType().Name, "Unable to decrypt the file.");
}
}
private static void UsingPublicKey(string inputFilePath, byte[] sharedSecret, byte[] recipientPrivateKey)
{
try
{
bool fileIsDirectory = FileHandling.IsDirectory(inputFilePath);
if (fileIsDirectory)
{
DirectoryDecryption.UsingPublicKey(inputFilePath, sharedSecret, recipientPrivateKey);
return;
}
using var inputFile = new FileStream(inputFilePath, FileMode.Open, FileAccess.Read, FileShare.Read, Constants.FileStreamBufferSize, FileOptions.RandomAccess);
byte[] ephemeralPublicKey = FileHeaders.ReadEphemeralPublicKey(inputFile);
byte[] ephemeralSharedSecret = KeyExchange.GetSharedSecret(recipientPrivateKey, ephemeralPublicKey);
byte[] salt = FileHeaders.ReadSalt(inputFile);
byte[] keyEncryptionKey = Generate.KeyEncryptionKey(sharedSecret, ephemeralSharedSecret, salt);
string outputFilePath = GetOutputFilePath(inputFilePath);
DecryptFile.Initialize(inputFile, outputFilePath, ephemeralPublicKey, keyEncryptionKey);
CryptographicOperations.ZeroMemory(keyEncryptionKey);
DecryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.Cryptography(ex))
{
FileException(inputFilePath, ex);
}
}
private static void DecryptInputFile(FileStream inputFile, byte[] ephemeralPublicKey, byte[] keyEncryptionKey)
{
string inputFilePath = inputFile.Name;
string outputFilePath = FileDecryption.GetOutputFilePath(inputFilePath);
DecryptFile.Initialize(inputFile, outputFilePath, ephemeralPublicKey, keyEncryptionKey);
FileDecryption.DecryptionSuccessful(inputFilePath, outputFilePath);
}
private static void DecryptInputFile(string inputFilePath, byte[] keyEncryptionKey)
{
try
{
string outputFilePath = FileDecryption.GetOutputFilePath(inputFilePath);
DecryptFile.Initialize(inputFilePath, outputFilePath, keyEncryptionKey);
FileDecryption.DecryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.Cryptography(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Error);
if (ex is ArgumentException || ex is ArgumentOutOfRangeException)
{
DisplayMessage.FilePathMessage(inputFilePath, ex.Message);
return;
}
DisplayMessage.FilePathException(inputFilePath, ex.GetType().Name, "Unable to decrypt the file.");
}
}
