public static void RecoverPublicKey(string privateKeyPath)
{
bool validUserInput = FilePathValidation.RecoverPublicKey(privateKeyPath);
if (!validUserInput)
{
return;
}
byte[] privateKey = AsymmetricKeyValidation.GetPrivateKeyFromFile(privateKeyPath);
if (privateKey == null)
{
return;
}
privateKey = PrivateKey.Decrypt(privateKey);
if (privateKey == null)
{
return;
}
byte[] publicKey = privateKey.Length switch
{
Constants.EncryptionKeyLength => AsymmetricKeys.GetCurve25519PublicKey(privateKey),
_ => AsymmetricKeys.GetEd25519PublicKey(privateKey),
};
Console.WriteLine($"Public key: {Convert.ToBase64String(publicKey)}");
}
private static void DecryptEachFileWithPrivateKey(string[] filePaths, byte[] privateKey)
{
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileDecryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
try
{
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(privateKey, ephemeralPublicKey);
byte[] salt = FileHeaders.ReadSalt(inputFile);
byte[] keyEncryptionKey = Generate.KeyEncryptionKey(ephemeralSharedSecret, salt);
DecryptInputFile(inputFile, ephemeralPublicKey, keyEncryptionKey);
CryptographicOperations.ZeroMemory(keyEncryptionKey);
}
catch (Exception ex) when(ExceptionFilters.Cryptography(ex))
{
FileException(inputFilePath, ex);
}
}
}
public static void GenerateNewKeyPair(string exportDirectoryPath)
{
try
{
int keyPairType = GetKeyPairType();
bool validUserInput = FilePathValidation.GenerateKeyPair(exportDirectoryPath, keyPairType);
if (!validUserInput)
{
return;
}
string publicKey, privateKey, publicKeyPath, privateKeyPath;
if (keyPairType == 1)
{
(publicKey, privateKey) = AsymmetricKeys.GenerateEncryptionKeyPair();
(publicKeyPath, privateKeyPath) = AsymmetricKeys.ExportEncryptionKeyPair(exportDirectoryPath, publicKey, privateKey);
}
else
{
(publicKey, privateKey) = AsymmetricKeys.GenerateSigningKeyPair();
(publicKeyPath, privateKeyPath) = AsymmetricKeys.ExportSigningKeyPair(exportDirectoryPath, publicKey, privateKey);
}
DisplayKeyPair(publicKey, publicKeyPath, privateKeyPath);
}
catch (Exception ex) when(ExceptionFilters.FileAccess(ex))
{
Logging.LogException(ex.ToString(), Logging.Severity.Error);
DisplayMessage.FilePathException(exportDirectoryPath, ex.GetType().Name, "Unable to export key pair.");
}
}
private static void DecryptEachFileWithPassword(string[] filePaths, byte[] keyEncryptionKey)
{
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileDecryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
DecryptInputFile(inputFilePath, keyEncryptionKey);
}
Utilities.ZeroArray(keyEncryptionKey);
}
private static void FileEncryptionWithPassword(char[] password, string keyfilePath, string[] filePaths)
{
bool validUserInput = FileEncryptionValidation.FileEncryptionWithPassword(password, keyfilePath, filePaths);
if (!validUserInput)
{
return;
}
if (!File.Exists(keyfilePath))
{
keyfilePath = FilePathValidation.KeyfilePath(keyfilePath);
}
byte[] passwordBytes = Password.Hash(password, keyfilePath);
FileEncryption.EncryptEachFileWithPassword(filePaths, passwordBytes);
}
public static void EncryptEachFileWithPassword(string[] filePaths, byte[] passwordBytes)
{
Globals.TotalCount = filePaths.Length;
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileEncryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
UsingPassword(inputFilePath, passwordBytes);
}
Utilities.ZeroArray(passwordBytes);
DisplayMessage.SuccessfullyEncrypted();
}
public static void DecryptEachFileWithPassword(string[] filePaths, byte[] passwordBytes)
{
Globals.TotalCount = filePaths.Length;
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileDecryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
UsingPassword(inputFilePath, passwordBytes);
}
CryptographicOperations.ZeroMemory(passwordBytes);
DisplayMessage.SuccessfullyDecrypted();
}
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 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 DecryptEachFileWithPrivateKey(string[] filePaths, byte[] privateKey)
{
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileDecryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
byte[] ephemeralPublicKey = FileHeaders.ReadEphemeralPublicKey(inputFilePath);
byte[] ephemeralSharedSecret = KeyExchange.GetSharedSecret(privateKey, ephemeralPublicKey);
byte[] salt = FileHeaders.ReadSalt(inputFilePath);
byte[] keyEncryptionKey = Generate.KeyEncryptionKey(ephemeralSharedSecret, salt);
DecryptInputFile(inputFilePath, keyEncryptionKey);
Utilities.ZeroArray(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);
}
}
public static void EncryptEachFileWithPrivateKey(string[] filePaths, byte[] privateKey)
{
Globals.TotalCount = filePaths.Length;
privateKey = PrivateKey.Decrypt(privateKey);
if (privateKey == null)
{
return;
}
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileEncryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
UsingPrivateKey(inputFilePath, privateKey);
}
Utilities.ZeroArray(privateKey);
DisplayMessage.SuccessfullyEncrypted();
}
private static void VerifySignature(string publicKeyPath, string signatureFilePath, string[] filePaths)
{
bool validUserInput = SigningValidation.Verify(publicKeyPath, signatureFilePath, filePaths);
if (!validUserInput)
{
return;
}
signatureFilePath = FilePathValidation.GetSignatureFilePath(signatureFilePath, filePaths);
bool validSignatureFile = SigningValidation.SignatureFile(signatureFilePath);
if (!validSignatureFile)
{
return;
}
byte[] publicKey = AsymmetricKeyValidation.SigningPublicKeyFile(publicKeyPath);
if (publicKey == null)
{
return;
}
FileSigning.VerifyFile(signatureFilePath, filePaths[0], publicKey);
}
public static void EncryptEachFileWithPublicKey(string[] filePaths, byte[] senderPrivateKey, byte[] recipientPublicKey)
{
Globals.TotalCount = filePaths.Length;
senderPrivateKey = PrivateKey.Decrypt(senderPrivateKey);
if (senderPrivateKey == null)
{
return;
}
byte[] sharedSecret = KeyExchange.GetSharedSecret(senderPrivateKey, recipientPublicKey);
Utilities.ZeroArray(senderPrivateKey);
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileEncryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
UsingPublicKey(inputFilePath, sharedSecret, recipientPublicKey);
}
Utilities.ZeroArray(sharedSecret);
DisplayMessage.SuccessfullyEncrypted();
}
public static void DecryptEachFileWithPublicKey(string[] filePaths, byte[] recipientPrivateKey, byte[] senderPublicKey)
{
Globals.TotalCount = filePaths.Length;
recipientPrivateKey = PrivateKey.Decrypt(recipientPrivateKey);
if (recipientPrivateKey == null)
{
return;
}
byte[] sharedSecret = KeyExchange.GetSharedSecret(recipientPrivateKey, senderPublicKey);
foreach (string inputFilePath in filePaths)
{
bool validFilePath = FilePathValidation.FileDecryption(inputFilePath);
if (!validFilePath)
{
--Globals.TotalCount;
continue;
}
UsingPublicKey(inputFilePath, sharedSecret, recipientPrivateKey);
}
CryptographicOperations.ZeroMemory(recipientPrivateKey);
CryptographicOperations.ZeroMemory(sharedSecret);
DisplayMessage.SuccessfullyDecrypted();
}
