internal static extern bool CryptImportKey( SafeCryptoContextHandle cryptoContext, byte[] key, uint keyLength, SafeCryptoKeyHandle pubKey, CryptImportKeyFlags flags, out SafeCryptoKeyHandle keyHandle);
internal static extern bool CryptCreateHash( SafeCryptoContextHandle cryptoContext, AlgorithmId algorithmId, SafeCryptoKeyHandle key, int flags, out SafeCryptoHashHandle hash);