private static void UsingPublicKey(string inputFilePath, byte[] sharedSecret, byte[] recipientPublicKey)
{
try
{
bool fileIsDirectory = FileHandling.IsDirectory(inputFilePath);
if (fileIsDirectory)
{
DirectoryEncryption.UsingPublicKey(inputFilePath, sharedSecret, recipientPublicKey);
return;
}
// Derive a unique KEK per file
(byte[] ephemeralSharedSecret, byte[] ephemeralPublicKey) = KeyExchange.GetEphemeralSharedSecret(recipientPublicKey);
byte[] salt = Generate.Salt();
byte[] keyEncryptionKey = Generate.KeyEncryptionKey(sharedSecret, ephemeralSharedSecret, salt);
string outputFilePath = GetOutputFilePath(inputFilePath);
EncryptFile.Initialize(inputFilePath, outputFilePath, ephemeralPublicKey, salt, keyEncryptionKey);
Utilities.ZeroArray(keyEncryptionKey);
EncryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.FileAccess(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Error);
DisplayMessage.FilePathException(inputFilePath, ex.GetType().Name, "Unable to encrypt the file.");
}
}
private static void UsingPassword(string inputFilePath, byte[] passwordBytes)
{
try
{
bool fileIsDirectory = FileHandling.IsDirectory(inputFilePath);
if (fileIsDirectory)
{
DirectoryEncryption.UsingPassword(inputFilePath, passwordBytes);
return;
}
// Derive a unique KEK per file
byte[] salt = Generate.Salt();
byte[] keyEncryptionKey = Argon2.DeriveKey(passwordBytes, salt);
// Fill the ephemeral public key header with random key (since not in use)
byte[] randomEphemeralPublicKeyHeader = Generate.EphemeralPublicKeyHeader();
string outputFilePath = GetOutputFilePath(inputFilePath);
EncryptFile.Initialize(inputFilePath, outputFilePath, randomEphemeralPublicKeyHeader, salt, keyEncryptionKey);
Utilities.ZeroArray(keyEncryptionKey);
EncryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.FileAccess(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Error);
DisplayMessage.FilePathException(inputFilePath, ex.GetType().Name, "Unable to encrypt the file.");
}
}
private static void UsingPassword(string inputFilePath, byte[] passwordBytes)
{
try
{
bool fileIsDirectory = FileHandling.IsDirectory(inputFilePath);
if (fileIsDirectory)
{
DirectoryEncryption.UsingPassword(inputFilePath, passwordBytes);
return;
}
// Derive a unique KEK per file
byte[] salt = Generate.Salt();
byte[] keyEncryptionKey = Argon2.DeriveKey(passwordBytes, salt);
// Fill unused header with random public key
byte[] ephemeralPublicKey = Generate.EphemeralPublicKeyHeader();
string outputFilePath = GetOutputFilePath(inputFilePath);
EncryptFile.Initialize(inputFilePath, outputFilePath, ephemeralPublicKey, salt, keyEncryptionKey);
CryptographicOperations.ZeroMemory(keyEncryptionKey);
EncryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.Cryptography(ex))
{
DisplayMessage.FilePathException(inputFilePath, ex.GetType().Name, "Unable to encrypt the file.");
}
}
private static void EncryptInputFile(string inputFilePath, string outputFilePath, byte[] ephemeralPublicKey, byte[] salt, byte[] keyEncryptionKey)
{
try
{
EncryptFile.Initialize(inputFilePath, outputFilePath, ephemeralPublicKey, salt, keyEncryptionKey);
FileEncryption.EncryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.Cryptography(ex))
{
DisplayMessage.FilePathException(inputFilePath, ex.GetType().Name, "Unable to encrypt the file.");
}
}
private static void UsingPrivateKey(string inputFilePath, byte[] privateKey)
{
try
{
bool fileIsDirectory = FileHandling.IsDirectory(inputFilePath);
if (fileIsDirectory)
{
DirectoryEncryption.UsingPrivateKey(inputFilePath, privateKey);
return;
}
// Derive a unique KEK per file
byte[] ephemeralSharedSecret = KeyExchange.GetPrivateKeySharedSecret(privateKey, out byte[] ephemeralPublicKey);
byte[] salt = Generate.Salt();
byte[] keyEncryptionKey = Generate.KeyEncryptionKey(ephemeralSharedSecret, salt);
string outputFilePath = GetOutputFilePath(inputFilePath);
EncryptFile.Initialize(inputFilePath, outputFilePath, ephemeralPublicKey, salt, keyEncryptionKey);
CryptographicOperations.ZeroMemory(keyEncryptionKey);
EncryptionSuccessful(inputFilePath, outputFilePath);
}
catch (Exception ex) when(ExceptionFilters.Cryptography(ex))
{
DisplayMessage.FilePathException(inputFilePath, ex.GetType().Name, "Unable to encrypt the file.");
}
}
