private string NextToken(char[] delimiters)
{
var str = "";
var currentPos = _currentPos;
while (Array.IndexOf(delimiters, _chars[(int)((IntPtr)_currentPos)], 0, delimiters.Length) != -1)
{
if ((_currentPos += 1L) == _chars.Length)
{
_currentPos = currentPos;
throw ExceptionUtility.ArgumentOutOfRange("delimiters");
}
}
while (Array.IndexOf(delimiters, _chars[(int)((IntPtr)_currentPos)], 0, delimiters.Length) == -1)
{
str = str + _chars[(int)((IntPtr)_currentPos)];
if ((_currentPos += 1L) == _chars.Length)
{
return(str);
}
}
return(str);
}
private bool VerifyHash(byte[] hash, byte[] signature)
{
if (hash == null)
{
throw ExceptionUtility.ArgumentNull("hash");
}
if (signature == null)
{
throw ExceptionUtility.ArgumentNull("signature");
}
if (hash.Length != 64)
{
throw ExceptionUtility.ArgumentOutOfRange("InvalidHashSize");
}
bool res = false;
UsingKey(h =>
{
res = CryptoApiHelper.VerifySign(_providerHandle, h, hash, signature, GostAlgorithmType.Gost2012_512);
});
return(res);
}
private byte[] SignHash(byte[] hash)
{
if (hash == null)
{
throw ExceptionUtility.ArgumentNull("hash");
}
if (hash.Length != 32)
{
throw ExceptionUtility.ArgumentOutOfRange("hash", Resources.InvalidHashSize);
}
if (IsPublicKeyOnly)
{
throw ExceptionUtility.CryptographicException(Resources.NoPrivateKey);
}
GetKeyPair();
if (!CspKeyContainerInfo.RandomlyGenerated)
{
var keyContainerPermission = new KeyContainerPermission(KeyContainerPermissionFlags.NoFlags);
var keyContainerAccessEntry = new KeyContainerPermissionAccessEntry(_providerParameters, KeyContainerPermissionFlags.Sign);
keyContainerPermission.AccessEntries.Add(keyContainerAccessEntry);
keyContainerPermission.Demand();
}
return(CryptoApiHelper.SignValue(_providerHandle, _providerParameters.KeyNumber, hash));
}
public static Gost_28147_89_SymmetricAlgorithm CreateFromPassword(HashAlgorithm hashAlgorithm, byte[] password)
{
if (hashAlgorithm == null)
{
throw ExceptionUtility.ArgumentNull(nameof(hashAlgorithm));
}
if (!(hashAlgorithm is IGostAlgorithm gostHashAlgorithm))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(hashAlgorithm));
}
if (!(hashAlgorithm is ISafeHandleProvider <SafeHashHandleImpl> hashHandleProvider))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(hashAlgorithm));
}
if (password == null)
{
throw ExceptionUtility.ArgumentNull(nameof(password));
}
hashAlgorithm.TransformBlock(password, 0, password.Length, password, 0);
var providerType = gostHashAlgorithm.ProviderType;
var providerHandle = CryptoApiHelper.GetProviderHandle(providerType);
var symKeyHandle = CryptoApiHelper.DeriveSymKey(providerHandle, hashHandleProvider.SafeHandle);
return(new Gost_28147_89_SymmetricAlgorithm(providerType, providerHandle, symKeyHandle));
}
public static unsafe void HashData(SafeHashHandleImpl hashHandle, byte[] data, int dataOffset, int dataLength)
{
if (data == null)
{
throw ExceptionUtility.ArgumentNull(nameof(data));
}
if (dataOffset < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataOffset));
}
if (dataLength < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataLength));
}
if (data.Length < dataOffset + dataLength)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataLength));
}
if (dataLength > 0)
{
fixed(byte *dataRef = data)
{
var dataOffsetRef = dataRef + dataOffset;
if (!CryptoApi.CryptHashData(hashHandle, dataOffsetRef, (uint)dataLength, 0))
{
throw CreateWin32Error();
}
}
}
}
public byte[] TransformFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
{
if (inputBuffer == null)
{
throw ExceptionUtility.ArgumentNull(nameof(inputBuffer));
}
if (inputOffset < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(inputOffset));
}
if ((inputCount < 0) || (inputCount > inputBuffer.Length))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(inputOffset), Resources.InvalidDataOffset);
}
if ((inputBuffer.Length - inputCount) < inputOffset)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(inputOffset), Resources.InvalidDataOffset);
}
byte[] buffer = null;
if (_transformMode == Gost_28147_89_CryptoTransformMode.Encrypt)
{
CryptoApiHelper.EncryptData(_providerType, _keyHandle, inputBuffer, inputOffset, inputCount, ref buffer, 0, _paddingValue, true, _isStreamModeValue);
Reset();
return(buffer);
}
if (_isStreamModeValue)
{
CryptoApiHelper.DecryptData(_keyHandle, inputBuffer, inputOffset, inputCount, ref buffer, 0, _paddingValue, true);
Reset();
return(buffer);
}
if ((inputCount % InputBlockSize) != 0)
{
throw ExceptionUtility.CryptographicException(Resources.DecryptInvalidDataSize);
}
if (_dataBuffer == null)
{
CryptoApiHelper.DecryptData(_keyHandle, inputBuffer, inputOffset, inputCount, ref buffer, 0, _paddingValue, true);
Reset();
return(buffer);
}
var destinationArray = new byte[_dataBuffer.Length + inputCount];
Array.Copy(_dataBuffer, 0, destinationArray, 0, _dataBuffer.Length);
Array.Copy(inputBuffer, inputOffset, destinationArray, _dataBuffer.Length, inputCount);
CryptoApiHelper.DecryptData(_keyHandle, destinationArray, 0, destinationArray.Length, ref buffer, 0, _paddingValue, true);
Reset();
return(buffer);
}
/// <inheritdoc />
protected override void ValidateHashParameter(byte[] hash)
{
if (hash == null)
{
throw ExceptionUtility.ArgumentNull(nameof(hash));
}
if (hash.Length != Gost_R3411_2012_256_HashAlgorithm.DefaultHashSizeValue / 8)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(hash), Resources.InvalidHashSize, Gost_R3411_2012_256_HashAlgorithm.DefaultHashSizeValue / 8);
}
}
private byte[] EncodeKeyExchangeInternal(Gost28147SymmetricAlgorithm keyExchangeAlgorithm, GostKeyExchangeExportMethod keyExchangeExportMethod)
{
switch (keyExchangeExportMethod)
{
case GostKeyExchangeExportMethod.GostKeyExport:
return(EncodeKeyExchangeInternal(keyExchangeAlgorithm, Constants.CALG_SIMPLE_EXPORT));
case GostKeyExchangeExportMethod.CryptoProKeyExport:
return(EncodeKeyExchangeInternal(keyExchangeAlgorithm, Constants.CALG_PRO_EXPORT));
}
throw ExceptionUtility.ArgumentOutOfRange("keyExchangeExportMethod");
}
protected static int ParseInt(string str, IntHolder off, int len)
{
if ((off.Value + len) > str.Length)
{
throw ExceptionUtility.ArgumentOutOfRange("off");
}
var mValue = off.Value;
off.Value += len;
return(int.Parse(str.Substring(mValue, len)));
}
public override SymmetricAlgorithm DecodeKeyExchange(byte[] encodedKeyExchangeData, GostKeyExchangeExportMethod keyExchangeExportMethod)
{
switch (keyExchangeExportMethod)
{
case GostKeyExchangeExportMethod.GostKeyExport:
return(DecodeKeyExchangeInternal(encodedKeyExchangeData, Constants.CALG_SIMPLE_EXPORT));
case GostKeyExchangeExportMethod.CryptoProKeyExport:
return(DecodeKeyExchangeInternal(encodedKeyExchangeData, Constants.CALG_PRO_EXPORT));
}
throw ExceptionUtility.ArgumentOutOfRange(nameof(keyExchangeExportMethod));
}
/// <inheritdoc />
public override void SetKey(AsymmetricAlgorithm privateKey)
{
if (privateKey == null)
{
throw ExceptionUtility.ArgumentNull(nameof(privateKey));
}
if (!(privateKey is GostAsymmetricAlgorithm gostPrivateKey))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(privateKey), Resources.ShouldSupportGost3410);
}
_privateKey = gostPrivateKey;
}
/// <inheritdoc />
public override void SetKey(AsymmetricAlgorithm publicKey)
{
if (publicKey == null)
{
throw ExceptionUtility.ArgumentNull(nameof(publicKey));
}
if (!(publicKey is Gost_R3410_AsymmetricAlgorithmBase <TKeyParams, TKeyAlgorithm> gostPublicKey))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(publicKey), Resources.ShouldSupportGost3410);
}
_publicKey = gostPublicKey;
}
/// <summary>
/// Устанавливает открытый ключ для проверки цифрововй подписи.
/// </summary>
/// <param name="publicKey">Открытый ключ для проверки цифровой подписи.</param>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <exception cref="ArgumentNullException"></exception>
public override void SetKey(AsymmetricAlgorithm publicKey)
{
if (publicKey == null)
{
throw ExceptionUtility.ArgumentNull("publicKey");
}
if (!(publicKey is Gost3410AsymmetricAlgorithmBase))
{
throw ExceptionUtility.ArgumentOutOfRange("publicKey", Resources.ShouldSupportGost3410);
}
_publicKey = (Gost3410AsymmetricAlgorithmBase)publicKey;
}
private byte[] SignHash(byte[] hash)
{
if (hash == null)
{
throw ExceptionUtility.ArgumentNull("hash");
}
if (hash.Length != 64)
{
throw ExceptionUtility.ArgumentOutOfRange("hash", "InvalidHashSize");
}
var res = CryptoApiHelper.SignValue(_providerHandle, _providerParameters.KeyNumber, hash, GostAlgorithmType.Gost2012_512);
return(res);
}
/// <inheritdoc />
public override void SetKey(AsymmetricAlgorithm publicKey)
{
if (publicKey == null)
{
throw ExceptionUtility.ArgumentNull(nameof(publicKey));
}
if (!(publicKey is GostAsymmetricAlgorithm gostPublicKey))
{
if (publicKey.SignatureAlgorithm.IndexOf("gost", StringComparison.OrdinalIgnoreCase) < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(publicKey), Resources.ShouldSupportGost3410);
}
gostPublicKey = new GostExternalAsymmetricAlgorithm(publicKey);
}
_publicKey = gostPublicKey;
}
public Gost_28147_89_SymmetricAlgorithmBase DeriveKey(int position)
{
if ((position % _hmac.HashSize) != 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(position));
}
var keyIndex = position / _hmac.HashSize;
if (keyIndex < _keyIndex)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(position));
}
while (keyIndex > _keyIndex)
{
DeriveKey().Clear();
}
return(DeriveKey());
}
public Gost28147 DeriveKey(int position)
{
if ((position % 256) != 0)
{
throw ExceptionUtility.ArgumentOutOfRange("position");
}
var keyIndex = position / 256;
if (keyIndex < _keyIndex)
{
throw ExceptionUtility.ArgumentOutOfRange("position");
}
while (keyIndex > _keyIndex)
{
DeriveKey().Clear();
}
return(DeriveKey());
}
public string NextToken(string delimiters)
{
_delimiters = delimiters;
var array = delimiters.ToCharArray();
if (_currentPos == _chars.Length)
{
throw ExceptionUtility.ArgumentOutOfRange("delimiters");
}
if ((Array.IndexOf(array, _chars[(int)((IntPtr)_currentPos)], 0, array.Length) != -1) && _includeDelims)
{
long num;
_currentPos = (num = _currentPos) + 1L;
return("" + _chars[(int)((IntPtr)num)]);
}
return(NextToken(delimiters.ToCharArray()));
}
private bool VerifyHash(byte[] hash, byte[] signature)
{
if (hash == null)
{
throw ExceptionUtility.ArgumentNull("hash");
}
if (signature == null)
{
throw ExceptionUtility.ArgumentNull("signature");
}
if (hash.Length != 32)
{
throw ExceptionUtility.ArgumentOutOfRange(Resources.InvalidHashSize);
}
GetKeyPair();
return(CryptoApiHelper.VerifySign(_providerHandle, _keyHandle, hash, signature));
}
public override SymmetricAlgorithm DecodePrivateKey(byte[] encodedKeyExchangeData, GostKeyExchangeExportMethod keyExchangeExportMethod)
{
if (encodedKeyExchangeData == null)
{
throw ExceptionUtility.ArgumentNull("encodedKeyExchangeData");
}
int keyExchangeExportAlgId;
if (keyExchangeExportMethod == GostKeyExchangeExportMethod.GostKeyExport)
{
keyExchangeExportAlgId = Constants.CALG_SIMPLE_EXPORT;
}
else if (keyExchangeExportMethod == GostKeyExchangeExportMethod.CryptoProKeyExport)
{
keyExchangeExportAlgId = Constants.CALG_PRO_EXPORT;
}
else
{
throw ExceptionUtility.ArgumentOutOfRange("keyExchangeExportMethod");
}
var providerHandle = CryptoApiHelper.ProviderHandle;
var keyExchangeInfo = new GostKeyExchangeInfo();
keyExchangeInfo.Decode(encodedKeyExchangeData);
using (var keyHandle = CryptoApiHelper.DuplicateKey(InternalKeyHandle))
{
CryptoApiHelper.SetKeyParameterInt32(keyHandle, Constants.KP_ALGID, keyExchangeExportAlgId);
var keyExchangeHandle = CryptoApiHelper.ImportKeyExchange(providerHandle, keyExchangeInfo, keyHandle);
return(new Gost28147SymmetricAlgorithm(providerHandle, keyExchangeHandle));
}
}
public override SymmetricAlgorithm DecodePrivateKey(byte[] encodedKeyExchangeData, GostKeyExchangeExportMethod keyExchangeExportMethod)
{
if (encodedKeyExchangeData == null)
{
throw ExceptionUtility.ArgumentNull(nameof(encodedKeyExchangeData));
}
int keyExchangeExportAlgId;
if (keyExchangeExportMethod == GostKeyExchangeExportMethod.GostKeyExport)
{
keyExchangeExportAlgId = Constants.CALG_SIMPLE_EXPORT;
}
else if (keyExchangeExportMethod == GostKeyExchangeExportMethod.CryptoProKeyExport)
{
keyExchangeExportAlgId = Constants.CALG_PRO_EXPORT;
}
else
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(keyExchangeExportMethod));
}
var providerHandle = CryptoApiHelper.GetProviderHandle(ProviderType);
var keyExchangeInfo = new Gost_28147_89_KeyExchangeInfo();
keyExchangeInfo.Decode(encodedKeyExchangeData);
using (var keyHandle = CryptoApiHelper.DuplicateKey(this.GetSafeHandle()))
{
CryptoApiHelper.SetKeyExchangeExportAlgId(ProviderType, keyHandle, keyExchangeExportAlgId);
var keyExchangeHandle = CryptoApiHelper.ImportKeyExchange(providerHandle, keyExchangeInfo, keyHandle);
return(new Gost_28147_89_SymmetricAlgorithm(ProviderType, providerHandle, keyExchangeHandle));
}
}
public override byte[] EncodePrivateKey(Gost28147 keyExchangeAlgorithm, GostKeyExchangeExportMethod keyExchangeExportMethod)
{
if (keyExchangeAlgorithm == null)
{
throw ExceptionUtility.ArgumentNull("keyExchangeAlgorithm");
}
int keyExchangeExportAlgId;
if (keyExchangeExportMethod == GostKeyExchangeExportMethod.GostKeyExport)
{
keyExchangeExportAlgId = Constants.CALG_SIMPLE_EXPORT;
}
else if (keyExchangeExportMethod == GostKeyExchangeExportMethod.CryptoProKeyExport)
{
keyExchangeExportAlgId = Constants.CALG_PRO_EXPORT;
}
else
{
throw ExceptionUtility.ArgumentOutOfRange("keyExchangeExportMethod");
}
var currentSessionKey = keyExchangeAlgorithm as Gost28147SymmetricAlgorithm;
if (currentSessionKey == null)
{
using (var derivedSessinKey = new Gost28147SymmetricAlgorithm())
{
derivedSessinKey.Key = keyExchangeAlgorithm.Key;
return(EncodePrivateKeyInternal(derivedSessinKey, keyExchangeExportAlgId));
}
}
return(EncodePrivateKeyInternal(currentSessionKey, keyExchangeExportAlgId));
}
/// <inheritdoc />
public override byte[] CreateKeyExchange(byte[] keyExchangeData, Type keyExchangeAlgorithmType)
{
if (keyExchangeData == null)
{
throw ExceptionUtility.ArgumentNull(nameof(keyExchangeData));
}
if (keyExchangeAlgorithmType == null)
{
throw ExceptionUtility.ArgumentNull(nameof(keyExchangeAlgorithmType));
}
if (!typeof(GostSymmetricAlgorithm).IsAssignableFrom(keyExchangeAlgorithmType))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(keyExchangeAlgorithmType));
}
GostSymmetricAlgorithm keyExchangeAlgorithm;
if (_publicKey != null)
{
var constructorInfo = keyExchangeAlgorithmType.GetConstructor(new[] { typeof(ProviderType) });
keyExchangeAlgorithm = (GostSymmetricAlgorithm)constructorInfo.Invoke(new object[] { _publicKey.ProviderType });
}
else
{
keyExchangeAlgorithm = (GostSymmetricAlgorithm)Activator.CreateInstance(keyExchangeAlgorithmType);
}
using (keyExchangeAlgorithm)
{
keyExchangeAlgorithm.Key = keyExchangeData;
return(CreateKeyExchangeData(keyExchangeAlgorithm));
}
}
public static int EncryptData(ProviderType providerType, SafeKeyHandleImpl symKeyHandle, byte[] data, int dataOffset, int dataLength, ref byte[] encryptedData, int encryptedDataOffset, PaddingMode paddingMode, bool isDone, bool isStream)
{
if (dataOffset < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataOffset));
}
if (dataLength < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataLength));
}
if (dataOffset > data.Length)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataOffset), Resources.InvalidDataOffset);
}
var length = dataLength;
if (isDone)
{
length += 8;
}
// Выровненные данные
var dataAlignLength = (uint)dataLength;
var dataAlignArray = new byte[length];
Array.Clear(dataAlignArray, 0, length);
Array.Copy(data, dataOffset, dataAlignArray, 0, dataLength);
if (isDone)
{
var dataPadding = dataLength & 7;
var dataPaddingSize = (byte)(8 - dataPadding);
// Добпаление дополнения данных в зависимости от настроек
switch (paddingMode)
{
case PaddingMode.None:
if ((dataPadding != 0) && !isStream)
{
throw ExceptionUtility.CryptographicException(Resources.EncryptInvalidDataSize);
}
break;
case PaddingMode.Zeros:
if (dataPadding != 0)
{
dataAlignLength += dataPaddingSize;
// Дополнение заполняется нулевыми байтами
}
break;
case PaddingMode.PKCS7:
{
dataAlignLength += dataPaddingSize;
var paddingIndex = dataLength;
// Дополнение заполняется байтами, в каждый из которых записывается размер дополнения
while (paddingIndex < dataAlignLength)
{
dataAlignArray[paddingIndex++] = dataPaddingSize;
}
}
break;
case PaddingMode.ANSIX923:
{
dataAlignLength += dataPaddingSize;
// Дополнение заполняется нулевыми, кроме последнего - в него записывается размер дополнения
dataAlignArray[(int)((IntPtr)(dataAlignLength - 1))] = dataPaddingSize;
}
break;
case PaddingMode.ISO10126:
{
dataAlignLength += dataPaddingSize;
// Дополнение заполняется случайными байтами, кроме последнего - в него записывается размер дополнения
var randomPadding = new byte[dataPaddingSize - 1];
GetRandomNumberGenerator(providerType).GetBytes(randomPadding);
randomPadding.CopyTo(dataAlignArray, dataLength);
dataAlignArray[(int)((IntPtr)(dataAlignLength - 1))] = dataPaddingSize;
}
break;
default:
throw ExceptionUtility.Argument(nameof(paddingMode), Resources.InvalidPaddingMode);
}
}
// Шифрование данных
if (!CryptoApi.CryptEncrypt(symKeyHandle, SafeHashHandleImpl.InvalidHandle, false, 0, dataAlignArray, ref dataAlignLength, (uint)length))
{
throw CreateWin32Error();
}
// Копирование результата шифрования данных
if (encryptedData == null)
{
encryptedData = new byte[dataAlignLength];
Array.Copy(dataAlignArray, 0L, encryptedData, 0L, dataAlignLength);
}
else
{
if (encryptedDataOffset < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(encryptedDataOffset));
}
if ((encryptedData.Length < dataAlignLength) || ((encryptedData.Length - dataAlignLength) < encryptedDataOffset))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(encryptedDataOffset), Resources.InvalidDataOffset);
}
Array.Copy(dataAlignArray, 0L, encryptedData, encryptedDataOffset, dataAlignLength);
}
return((int)dataAlignLength);
}
public static int DecryptData(SafeKeyHandleImpl symKeyHandle, byte[] data, int dataOffset, int dataLength, ref byte[] decryptedData, int decryptedDataOffset, PaddingMode paddingMode, bool isDone)
{
if (dataOffset < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataOffset));
}
if (dataLength < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataLength));
}
if ((dataOffset > data.Length) || ((dataOffset + dataLength) > data.Length))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(dataOffset), Resources.InvalidDataOffset);
}
// Выровненные данные
var dataAlignLength = (uint)dataLength;
var dataAlign = new byte[dataAlignLength];
Array.Copy(data, dataOffset, dataAlign, 0L, dataAlignLength);
// Расшифровка данных
if (!CryptoApi.CryptDecrypt(symKeyHandle, SafeHashHandleImpl.InvalidHandle, false, 0, dataAlign, ref dataAlignLength))
{
throw CreateWin32Error();
}
var length = (int)dataAlignLength;
if (isDone)
{
byte dataPaddingSize = 0;
// Удаление дополнения данных в зависимости от настроек
if (((paddingMode == PaddingMode.PKCS7) || (paddingMode == PaddingMode.ANSIX923)) || (paddingMode == PaddingMode.ISO10126))
{
if (dataAlignLength < 8)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
// Размер дополнения находится в последнем байте
dataPaddingSize = dataAlign[(int)((IntPtr)(dataAlignLength - 1))];
if (dataPaddingSize > 8)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
// Проверка корректности дополнения данных
if (paddingMode == PaddingMode.PKCS7)
{
for (var paddingIndex = dataAlignLength - dataPaddingSize; paddingIndex < (dataAlignLength - 1); paddingIndex++)
{
if (dataAlign[paddingIndex] != dataPaddingSize)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
}
}
else if (paddingMode == PaddingMode.ANSIX923)
{
for (var paddingIndex = dataAlignLength - dataPaddingSize; paddingIndex < (dataAlignLength - 1); paddingIndex++)
{
if (dataAlign[paddingIndex] != 0)
{
throw ExceptionUtility.CryptographicException(Constants.NTE_BAD_DATA);
}
}
}
}
else if ((paddingMode != PaddingMode.None) && (paddingMode != PaddingMode.Zeros))
{
throw ExceptionUtility.Argument(nameof(paddingMode), Resources.InvalidPaddingMode);
}
length -= dataPaddingSize;
}
if (decryptedData == null)
{
decryptedData = new byte[length];
Array.Copy(dataAlign, 0, decryptedData, 0, length);
}
else
{
if (decryptedDataOffset < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(decryptedDataOffset));
}
if ((decryptedData.Length < length) || ((decryptedData.Length - length) < decryptedDataOffset))
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(decryptedData), Resources.InvalidDataOffset);
}
Array.Copy(dataAlign, 0, decryptedData, decryptedDataOffset, length);
}
return(length);
}
public int TransformBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
if (inputBuffer == null)
{
throw ExceptionUtility.ArgumentNull(nameof(inputBuffer));
}
if (outputBuffer == null)
{
throw ExceptionUtility.ArgumentNull(nameof(outputBuffer));
}
if (inputOffset < 0)
{
throw ExceptionUtility.ArgumentOutOfRange(nameof(inputOffset));
}
if ((inputCount <= 0) || ((inputCount % InputBlockSize) != 0) || (inputCount > inputBuffer.Length))
{
throw ExceptionUtility.Argument(nameof(inputOffset), Resources.InvalidDataOffset);
}
if ((inputBuffer.Length - inputCount) < inputOffset)
{
throw ExceptionUtility.Argument(nameof(inputOffset), Resources.InvalidDataOffset);
}
if (_transformMode == Gost_28147_89_CryptoTransformMode.Encrypt)
{
return(CryptoApiHelper.EncryptData(_providerType, _keyHandle, inputBuffer, inputOffset, inputCount, ref outputBuffer, outputOffset, _paddingValue, false, _isStreamModeValue));
}
if ((_paddingValue == PaddingMode.Zeros) || (_paddingValue == PaddingMode.None))
{
return(CryptoApiHelper.DecryptData(_keyHandle, inputBuffer, inputOffset, inputCount, ref outputBuffer, outputOffset, _paddingValue, false));
}
int dectyptDataLength;
if (_dataBuffer == null)
{
_dataBuffer = new byte[InputBlockSize];
var length = inputCount - InputBlockSize;
Array.Copy(inputBuffer, inputOffset + length, _dataBuffer, 0, InputBlockSize);
dectyptDataLength = CryptoApiHelper.DecryptData(_keyHandle, inputBuffer, inputOffset, length, ref outputBuffer, outputOffset, _paddingValue, false);
}
else
{
CryptoApiHelper.DecryptData(_keyHandle, _dataBuffer, 0, _dataBuffer.Length, ref outputBuffer, outputOffset, _paddingValue, false);
outputOffset += OutputBlockSize;
var length = inputCount - InputBlockSize;
Array.Copy(inputBuffer, inputOffset + length, _dataBuffer, 0, InputBlockSize);
dectyptDataLength = OutputBlockSize + CryptoApiHelper.DecryptData(_keyHandle, inputBuffer, inputOffset, length, ref outputBuffer, outputOffset, _paddingValue, false);
}
return(dectyptDataLength);
}
