private static ECDiffieHellmanCngPublicKey GetECDiffieHellmanCngPublicKey(X509Certificate2 cert)
{
var keyAlgoDerBytes = cert.GetKeyAlgorithmParameters();
var keyAlgoAsn1 = new Asn1InputStream(keyAlgoDerBytes).ReadObject();
var keyAlgoOid = new DerObjectIdentifier(keyAlgoAsn1.ToString());
var xmlImport = Rfc4050XmlMaker("ECDH", keyAlgoOid, cert);
var ecDiffieHellmanCngPublicKey = ECDiffieHellmanCngPublicKey.FromXmlString(xmlImport);
return ecDiffieHellmanCngPublicKey;
}