/// <summary>
/// Расшифрование симметричного ключа по
/// по <see cref="GostKeyWrapMethod.GostKeyWrap"/>.
/// </summary>
///
/// <param name="wrapped">Зашифрованный секретный ключ.</param>
///
/// <returns>Объект класса <see cref="SymmetricAlgorithm"/>,
/// содержащий расшифрованный закрытый ключ.</returns>
///
/// <exception cref="CryptographicException">При ошибках
/// на managed уровне.</exception>
private SymmetricAlgorithm GostUnwrap(byte[] wrapped)
{
GostWrappedKeyObject gwk = new GostWrappedKeyObject();
gwk.SetByXmlWrappedKey(wrapped);
SafeKeyHandle simmKey = SafeKeyHandle.InvalidHandle;
SafeKeyHandle hExpKey = SafeKeyHandle.InvalidHandle;
try
{
CapiHelper.ImportAndMakeSharedSecret(_safeProvHandle,
CspProviderFlags.NoFlags, _publicObject, _safeKeyHandle,
ref hExpKey, _algType);
CapiHelper.SetKeyParamDw(hExpKey, GostConstants.KP_ALGID,
GostConstants.CALG_SIMPLE_EXPORT);
CapiHelper.ImportSessionWrappedKey(_safeProvHandle,
CspProviderFlags.NoFlags, gwk, hExpKey, ref simmKey);
}
finally
{
if (!hExpKey.IsClosed)
{
hExpKey.Close();
}
}
return(new Gost28147CryptoServiceProvider(simmKey, _safeProvHandle));
}
/// <summary>
/// Wrap ключа Gost28147CryptoServiceProvider на agree
/// по <see cref="GostKeyWrapMethod.GostKeyWrap"/>.
/// </summary>
///
/// <param name="prov">Шифруемый ключ.</param>
///
/// <returns>Зашифрованный симметричный ключ.</returns>
///
/// <exception cref="CryptographicException">При ошибках
/// на managed уровне.</exception>
private byte[] GostWrap(Gost28147CryptoServiceProvider prov)
{
SafeKeyHandle hSimmKey = prov.SafeKeyHandle;
GostWrappedKeyObject wrappedKey = new GostWrappedKeyObject();
SafeKeyHandle hExpKey = SafeKeyHandle.InvalidHandle;
try
{
CapiHelper.ImportAndMakeSharedSecret(_safeProvHandle,
CspProviderFlags.NoFlags, _publicObject, _safeKeyHandle,
ref hExpKey, _algType);
CapiHelper.SetKeyParamDw(hExpKey, GostConstants.KP_ALGID,
GostConstants.CALG_SIMPLE_EXPORT);
CapiHelper.ExportSessionWrapedKey(hSimmKey,
hExpKey, wrappedKey);
}
finally
{
if (!hExpKey.IsClosed)
{
hExpKey.Close();
}
}
return(wrappedKey.GetXmlWrappedKey());
}
/// <summary>
/// Wrap ключа Gost28147CryptoServiceProvider на agree
/// по <see cref="GostKeyWrapMethod.CryptoProKeyWrap"/>.
/// </summary>
///
/// <param name="prov">Шифруемый ключ.</param>
/// <param name="calgProExport">CALG алгоритма экспорта крипто про</param>
/// <returns>Зашифрованный симметричный ключ.</returns>
///
/// <exception cref="CryptographicException">При ошибках
/// на managed уровне.</exception>
private byte[] CryptoProWrap(Gost28147CryptoServiceProvider prov, int calgProExport = GostConstants.CALG_PRO_EXPORT)
{
if (calgProExport != GostConstants.CALG_PRO_EXPORT && calgProExport != GostConstants.CALG_PRO12_EXPORT)
{
throw new ArgumentOutOfRangeException("calgProExport");
}
SafeKeyHandle hSimmKey = prov.SafeKeyHandle;
GostWrappedKeyObject wrappedKey = new GostWrappedKeyObject();
SafeKeyHandle hExpKey = SafeKeyHandle.InvalidHandle;
try
{
CapiHelper.ImportAndMakeSharedSecret(_safeProvHandle,
CspProviderFlags.NoFlags, _publicObject, _safeKeyHandle,
ref hExpKey, _algType);
CapiHelper.SetKeyParamDw(hExpKey, GostConstants.KP_ALGID,
calgProExport);
CapiHelper.ExportSessionWrapedKey(hSimmKey,
hExpKey, wrappedKey);
}
finally
{
if (!hExpKey.IsClosed)
{
hExpKey.Close();
}
}
return(wrappedKey.GetXmlWrappedKey());
}
/// <summary>
/// Расшифрование симметричного ключа по
/// по <see cref="GostKeyWrapMethod.CryptoProKeyWrap"/>.
/// </summary>
///
/// <param name="wrapped">Зашифрованный секретный ключ.</param>
/// <param name="calgProExport">OID алгоритма экспорта</param>
/// <returns>Объект класса <see cref="SymmetricAlgorithm"/>,
/// содержащий расшифрованный закрытый ключ.</returns>
///
/// <exception cref="CryptographicException">При ошибках
/// на managed уровне.</exception>
private SymmetricAlgorithm CryptoProUnwrap(byte[] wrapped, int calgProExport)
{
if (calgProExport != GostConstants.CALG_PRO_EXPORT && calgProExport != GostConstants.CALG_PRO12_EXPORT)
{
throw new ArgumentOutOfRangeException("calgProExport");
}
GostWrappedKeyObject gwk = new GostWrappedKeyObject();
gwk.SetByXmlWrappedKey(wrapped);
SafeKeyHandle simmKey = SafeKeyHandle.InvalidHandle;
SafeKeyHandle hExpKey = SafeKeyHandle.InvalidHandle;
try
{
CapiHelper.ImportAndMakeSharedSecret(_safeProvHandle,
CspProviderFlags.NoFlags, _publicObject, _safeKeyHandle,
ref hExpKey, _algType);
CapiHelper.SetKeyParamDw(hExpKey, GostConstants.KP_ALGID,
calgProExport);
CapiHelper.ImportSessionWrappedKey(_safeProvHandle,
CspProviderFlags.NoFlags, gwk, hExpKey, ref simmKey);
}
finally
{
if (!hExpKey.IsClosed)
{
hExpKey.Close();
}
}
return(new Gost28147CryptoServiceProvider(simmKey, _safeProvHandle));
}
