public void TestHeader()
{
var transform = new TransformationRepresentative(typeof(AesCryptoManager), new byte[] { 1, 2, 3 }, CipherMode.CTS, PaddingMode.PKCS7, 128, 128);
var key = new KeyRepresentative(typeof(Pbkdf2KeyDerive), 128UL, new byte[] { 1, 2, 3 });
var hmac = new HmacRepresentative(typeof(HMACMD5), new byte[] { 1, 2, 3 });
var data = new SymmetricCryptographicRepresentative(transform, key, hmac);
var dataTwo = new SymmetricCryptographicRepresentative();
const string path = @"C:\Users\johnk\source\repos\EncryptionApp\localpath.txt";
data.WriteHeaderToFile(path);
dataTwo.ReadHeaderFromFile(path);
File.Delete(path);
Assert.True(data.Equals(dataTwo));
}
/// <summary>
/// TODO
/// </summary>
/// <param name="request"></param>
/// <param name="password"></param>
/// <param name="desiredKeyDerivationMilliseconds"></param>
public void EncryptDataWithHeader(RequestStateRecord request, SecureString password,
int desiredKeyDerivationMilliseconds)
{
if (request.Contract.InstanceKeyContract == null)
{
throw new ArgumentNullException(nameof(request));
}
((IProgress <int>) this._progress)?.Report(0);
password.MakeReadOnly();
var salt = new byte[request.Contract.InstanceKeyContract.Value.SaltLengthBytes];
var iv = new byte[request.Contract.TransformationContract.InitializationVectorSizeBytes];
var rng = new RNGCryptoServiceProvider();
try
{
rng.GetBytes(salt);
rng.GetBytes(iv);
}
catch (CryptographicException exception)
{
FileStatics.WriteToLogFile(exception);
MessageBox.Show(
"There was an error generating secure random numbers. Please try again - check log file for more details");
}
var performanceDerivative =
new PerformanceDerivative(request.Contract.InstanceKeyContract.Value.PerformanceDerivative);
((IProgress <int>) this._progress)?.Report(25);
// Get the password
if (password.Length == 0)
{
MessageBox.Show("You must enter a password");
((IProgress <int>) this._progress)?.Report(0);
return;
}
#if TRACE
if (password.Length < App.This.CurrentSettings.MinPasswordLength)
{
MessageBox.Show("Password too short");
((IProgress <int>)_progress)?.Report(0);
return;
}
#endif
GCHandle byteHandle = SecureStringConverter.SecureStringToKeyDerive(password, salt,
performanceDerivative, request.Contract.InstanceKeyContract.Value.KeyAlgorithm, out KeyDerive keyDevice);
((IProgress <int>) this._progress)?.Report(35);
HMAC hmacAlg = null;
if (request.Contract.HmacContract != null)
{
// Create the algorithm using reflection
hmacAlg = (HMAC)Activator.CreateInstance(request.Contract.HmacContract.Value.HashAlgorithm);
}
Aes aesAlgorithm = new AesCng
{
BlockSize = (int)request.Contract.TransformationContract.BlockSize,
KeySize = (int)request.Contract.TransformationContract.KeySize,
Mode = request.Contract.TransformationContract.CipherMode,
Padding = request.Contract.TransformationContract.PaddingMode
};
var @params = new object[] { 1024 * 1024 * 1024, aesAlgorithm };
var encryptor =
(SymmetricCryptoManager)Activator.CreateInstance(request.Contract.TransformationContract.CryptoManager,
@params);
byte[] key = keyDevice.GetBytes((int)request.Contract.TransformationContract.KeySize / 8);
Externals.ZeroMemory(byteHandle.AddrOfPinnedObject(), ((byte[])byteHandle.Target).Length);
byteHandle.Free();
// Create a handle to the key to allow control of it
GCHandle keyHandle = GCHandle.Alloc(key, GCHandleType.Pinned);
// Encrypt the data to a temporary file
encryptor.EncryptFileBytes(this._filePath, App.This.DataTempFile, key, iv);
((IProgress <int>) this._progress)?.Report(90);
byte[] hash = null;
if (request.Contract.HmacContract != null)
{
// Create the signature derived from the encrypted data and key
byte[] signature = MessageAuthenticator.CreateHmac(App.This.DataTempFile, key, hmacAlg);
// Set the signature correctly in the CryptographicRepresentative object
hash = signature;
}
HmacRepresentative?hmac = request.Contract.HmacContract.HasValue
? new HmacRepresentative(request.Contract.HmacContract.Value.HashAlgorithm, hash)
: (HmacRepresentative?)null;
KeyRepresentative?keyRepresentative = new KeyRepresentative
(
request.Contract.InstanceKeyContract.Value.KeyAlgorithm,
request.Contract.InstanceKeyContract.Value.PerformanceDerivative,
salt
);
// Delete the key from memory for security
Externals.ZeroMemory(keyHandle.AddrOfPinnedObject(), key.Length);
keyHandle.Free();
var cryptographicInfo = new SymmetricCryptographicRepresentative
(
new TransformationRepresentative
(
request.Contract.TransformationContract.CryptoManager,
iv,
request.Contract.TransformationContract.CipherMode,
request.Contract.TransformationContract.PaddingMode,
request.Contract.TransformationContract.KeySize,
request.Contract.TransformationContract.BlockSize
),
keyRepresentative,
hmac
);
// Write the CryptographicRepresentative object to a file
cryptographicInfo.WriteHeaderToFile(this._filePath);
((IProgress <int>) this._progress)?.Report(98);
FileStatics.AppendToFile(this._filePath, App.This.DataTempFile);
((IProgress <int>) this._progress)?.Report(100);
}