private void GetKeyPairValue(CspParameters providerParams, bool randomKeyContainer, out SafeProvHandleImpl providerHandle, out SafeKeyHandleImpl keyHandle)
{
SafeProvHandleImpl resultProviderHandle = null;
SafeKeyHandleImpl resultKeyHandle = null;
try
{
resultProviderHandle = CreateProviderHandle(providerParams, randomKeyContainer);
if (providerParams.ParentWindowHandle != IntPtr.Zero)
{
CryptoApiHelper.SetProviderParameter(resultProviderHandle, providerParams.KeyNumber, Constants.PP_CLIENT_HWND, providerParams.ParentWindowHandle);
}
else if (providerParams.KeyPassword != null)
{
SetSignatureKeyPassword(resultProviderHandle, providerParams.KeyPassword, providerParams.KeyNumber);
}
try
{
resultKeyHandle = CryptoApiHelper.GetUserKey(resultProviderHandle, providerParams.KeyNumber);
}
catch (Exception exception)
{
var errorCode = Marshal.GetHRForException(exception);
if (errorCode != 0)
{
if (((providerParams.Flags & CspProviderFlags.UseExistingKey) != CspProviderFlags.NoFlags) || (errorCode != Constants.NTE_NO_KEY))
{
throw;
}
resultKeyHandle = CryptoApiHelper.GenerateKey(resultProviderHandle, providerParams.KeyNumber, providerParams.Flags);
}
}
var keyAlgIdInverted = CryptoApiHelper.GetKeyParameter(resultKeyHandle, Constants.KP_ALGID);
var keyAlgId = keyAlgIdInverted[0] | (keyAlgIdInverted[1] << 8) | (keyAlgIdInverted[2] << 16) | (keyAlgIdInverted[3] << 24);
if ((keyAlgId != ExchangeAlgId) && (keyAlgId != SignatureAlgId))
{
throw ExceptionUtility.NotSupported(Resources.KeyAlgorithmNotSupported);
}
}
catch (Exception)
{
resultProviderHandle?.Close();
resultKeyHandle?.Close();
throw;
}
providerHandle = resultProviderHandle;
keyHandle = resultKeyHandle;
}
