System.Net.Security.SafeFreeSslCredentials.SafeFreeSslCredentials C# (CSharp) Method

        public SafeFreeSslCredentials(X509Certificate certificate, SslProtocols protocols, EncryptionPolicy policy)
            : base(IntPtr.Zero, true)
        {
            Debug.Assert(
                certificate == null || certificate is X509Certificate2,
                "Only X509Certificate2 certificates are supported at this time");

            X509Certificate2 cert = (X509Certificate2)certificate;

            if (cert != null)
            {
                Debug.Assert(cert.HasPrivateKey, "cert.HasPrivateKey");

                using (RSAOpenSsl rsa = (RSAOpenSsl)cert.GetRSAPrivateKey())
                {
                    if (rsa != null)
                    {
                        _certKeyHandle = rsa.DuplicateKeyHandle();
                        Interop.Crypto.CheckValidOpenSslHandle(_certKeyHandle);
                    }
                }

                if (_certKeyHandle == null)
                {
                    using (ECDsaOpenSsl ecdsa = (ECDsaOpenSsl)cert.GetECDsaPrivateKey())
                    {
                        if (ecdsa != null)
                        {
                            _certKeyHandle = ecdsa.DuplicateKeyHandle();
                            Interop.Crypto.CheckValidOpenSslHandle(_certKeyHandle);
                        }
                    }
                }

                if (_certKeyHandle == null)
                {
                    throw new NotSupportedException(SR.net_ssl_io_no_server_cert);
                }

                _certHandle = Interop.Crypto.X509UpRef(cert.Handle);
                Interop.Crypto.CheckValidOpenSslHandle(_certHandle);
            }

            _protocols = protocols;
            _policy = policy;
        }