private static Gost28147SymmetricAlgorithm DuplicateKeyAlg(Gost28147 keyAlgorithm)
{
var keySymmetricAlgorithm = keyAlgorithm as Gost28147SymmetricAlgorithm;
return((keySymmetricAlgorithm != null)
? new Gost28147SymmetricAlgorithm(keySymmetricAlgorithm.InternalProvHandle, keySymmetricAlgorithm.InternalKeyHandle)
: new Gost28147SymmetricAlgorithm {
Key = keyAlgorithm.Key
});
}
public Gost28147ImitHashAlgorithm(Gost28147 key)
{
if (key == null)
{
throw ExceptionUtility.ArgumentNull("key");
}
KeyValue = null;
HashSizeValue = DefaultHashSize;
_keyAlgorithm = DuplicateKeyAlg(key);
}
public Gost3411Hmac(Gost28147 keyAlgorithm)
{
if (keyAlgorithm == null)
{
throw ExceptionUtility.ArgumentNull("keyAlgorithm");
}
HashName = DefaultHashName;
HashSizeValue = DefaultHashSize;
_keyAlgorithm = DuplicateKeyAlg(keyAlgorithm);
_hashHandle = CryptoApiHelper.CreateHashHmac(CryptoApiHelper.ProviderHandle, _keyAlgorithm.InternalKeyHandle, GostCryptoConfig.ProviderType == ProviderTypes.VipNet ? Constants.CALG_GR3411_HMAC34 : Constants.CALG_GR3411_HMAC);
}
public Gost3411Prf(Gost28147 key, byte[] label, byte[] seed) : this(label, seed)
{
if (key == null)
{
throw ExceptionUtility.ArgumentNull("key");
}
_hashHmacHandle = SafeHashHandleImpl.InvalidHandle;
_buffer = new byte[_labelAndSeed.Length + 32];
var gostSymmetricAlgorithm = key as Gost28147SymmetricAlgorithm;
_key = (gostSymmetricAlgorithm != null)
? new Gost28147SymmetricAlgorithm(gostSymmetricAlgorithm.InternalProvHandle, gostSymmetricAlgorithm.InternalKeyHandle)
: new Gost28147SymmetricAlgorithm {
Key = key.Key
};
}
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));
}
/// <summary> /// Экспортирует (шифрует) секретный ключ. /// </summary> /// <param name="keyExchangeAlgorithm">Общий секретный ключ.</param> /// <param name="keyExchangeExportMethod">Алгоритм экспорта общего секретного ключа.</param> public abstract byte[] EncodePrivateKey(Gost28147 keyExchangeAlgorithm, GostKeyExchangeExportMethod keyExchangeExportMethod);