public Gost_28147_89_CryptoTransform(
ProviderType providerType,
SafeKeyHandleImpl keyHandle,
Dictionary <int, object> keyParameters,
PaddingMode paddingValue,
CipherMode modeValue,
int blockSizeValue,
Gost_28147_89_CryptoTransformMode transformMode)
{
_providerType = providerType;
_keyHandle = keyHandle;
_paddingValue = paddingValue;
_isStreamModeValue = (modeValue == CipherMode.OFB) || (modeValue == CipherMode.CFB);
_blockSizeValue = blockSizeValue;
_transformMode = transformMode;
// Установка параметров ключа
foreach (var keyParameter in keyParameters)
{
var keyParameterId = keyParameter.Key;
var keyParameterValue = keyParameter.Value;
// Копирование значения параметра
if (keyParameterValue is byte[])
{
var keyParamValueBytes = (byte[])keyParameterValue;
var copyKeyParamValueBytes = new byte[keyParamValueBytes.Length];
Array.Copy(keyParamValueBytes, copyKeyParamValueBytes, keyParamValueBytes.Length);
keyParameterValue = copyKeyParamValueBytes;
}
else if (keyParameterValue is int)
{
keyParameterValue = (int)keyParameterValue;
}
else if (keyParameterValue is CipherMode)
{
keyParameterValue = Convert.ToInt32(keyParameterValue);
}
else if (keyParameterValue is PaddingMode)
{
keyParameterValue = Convert.ToInt32(keyParameterValue);
}
// Установка значения параметра
switch (keyParameterId)
{
case Constants.KP_IV:
{
_ivValue = (byte[])keyParameterValue;
var iv = _ivValue;
CryptoApiHelper.SetKeyParameter(_keyHandle, keyParameterId, iv);
}
break;
case Constants.KP_MODE:
{
CryptoApiHelper.SetKeyParameterInt32(_keyHandle, keyParameterId, (int)keyParameterValue);
}
break;
case Constants.KP_PADDING:
{
if (!providerType.IsVipNet())
{
CryptoApiHelper.SetKeyParameterInt32(_keyHandle, keyParameterId, (int)keyParameterValue);
}
}
break;
}
}
}
private ICryptoTransform CreateCryptoTransform(SafeKeyHandleImpl hKey, byte[] iv, Gost_28147_89_CryptoTransformMode transformMode)
{
// TODO: Refactor this!
// NOTE: The params order is important!
if (hKey == null)
{
hKey = CryptoApiHelper.GenerateKey(CryptoApiHelper.GetProviderHandle(ProviderType), Constants.CALG_G28147, CspProviderFlags.NoFlags);
}
var keyParameters = new Dictionary <int, object>();
if (ModeValue == CipherMode.CTS)
{
throw ExceptionUtility.CryptographicException(Resources.CipherTextSteamingNotSupported);
}
if ((Padding != PaddingMode.None) && ((ModeValue == CipherMode.OFB) || (ModeValue == CipherMode.CFB)))
{
throw ExceptionUtility.CryptographicException(Resources.InvalidPaddingMode);
}
// Установка KP_MODE
keyParameters.Add(Constants.KP_MODE, ModeValue);
// Установка KP_PADDING
keyParameters.Add(Constants.KP_PADDING, Constants.ZERO_PADDING);
if ((ModeValue == CipherMode.CFB) && (FeedbackSizeValue != DefaultFeedbackSize))
{
throw ExceptionUtility.CryptographicException(Resources.IncorrectFeedbackSize);
}
// Установка KP_IV
if (ModeValue != CipherMode.ECB)
{
if (iv == null)
{
iv = new byte[DefaultIvSize];
CryptoApiHelper.GetRandomNumberGenerator(ProviderType).GetBytes(iv);
}
if (iv.Length < DefaultIvSize)
{
throw ExceptionUtility.CryptographicException(Resources.InvalidIvSize);
}
keyParameters.Add(Constants.KP_IV, iv);
}
return(new Gost_28147_89_CryptoTransform(ProviderType, hKey, keyParameters, PaddingValue, ModeValue, BlockSizeValue, transformMode));
}
