public static int ImportCspBlob(byte[] importedKeyBytes, SafeProvHandleImpl providerHandle, SafeKeyHandleImpl publicKeyHandle, out SafeKeyHandleImpl keyExchangeHandle)
{
var dwFlags = MapCspKeyFlags(CspProviderFlags.NoFlags);
var keyExchangeRef = SafeKeyHandleImpl.InvalidHandle;
if (!CryptoApi.CryptImportKey(providerHandle, importedKeyBytes, (uint)importedKeyBytes.Length, publicKeyHandle, dwFlags, ref keyExchangeRef))
{
throw CreateWin32Error();
}
var keyNumberMask = BitConverter.ToInt32(importedKeyBytes, 4) & 0xE000;
var keyNumber = (keyNumberMask == 0xA000) ? Constants.AT_KEYEXCHANGE : Constants.AT_SIGNATURE;
keyExchangeHandle = keyExchangeRef;
return(keyNumber);
}