private static void EncryptEachFileWithPassword(string[] filePaths, byte[] salt, byte[] keyEncryptionKey)
{
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileEncryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
// Fill the ephemeral public key header with random bytes (since not in use)
byte[] randomEphemeralPublicKeyHeader = Generate.EphemeralPublicKeyHeader();
string outputFilePath = FileEncryption.GetOutputFilePath(inputFilePath);
EncryptInputFile(inputFilePath, outputFilePath, randomEphemeralPublicKeyHeader, salt, keyEncryptionKey);
}
Utilities.ZeroArray(keyEncryptionKey);
}
private static void EncryptEachFileWithPassword(string[] filePaths, byte[] salt, byte[] keyEncryptionKey)
{
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileEncryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
// Fill unused header with random public key
byte[] ephemeralPublicKey = Generate.EphemeralPublicKeyHeader();
string outputFilePath = FileEncryption.GetOutputFilePath(inputFilePath);
EncryptInputFile(inputFilePath, outputFilePath, ephemeralPublicKey, salt, keyEncryptionKey);
}
CryptographicOperations.ZeroMemory(keyEncryptionKey);
}
private static void EncryptEachFileWithPrivateKey(string[] filePaths, byte[] privateKey)
{
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileEncryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
// 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 = FileEncryption.GetOutputFilePath(inputFilePath);
EncryptInputFile(inputFilePath, outputFilePath, ephemeralPublicKey, salt, keyEncryptionKey);
CryptographicOperations.ZeroMemory(keyEncryptionKey);
}
}
private static void EncryptEachFileWithPublicKey(string[] filePaths, byte[] sharedSecret, byte[] recipientPublicKey)
{
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileEncryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
// 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 = FileEncryption.GetOutputFilePath(inputFilePath);
EncryptInputFile(inputFilePath, outputFilePath, ephemeralPublicKey, salt, keyEncryptionKey);
Utilities.ZeroArray(keyEncryptionKey);
}
}
