public void Listen(string port, string identityHint, byte[] psk)
{
this.identityHint = identityHint;
this.psk = psk;
IntPtr tls;
OpenSSL.OpenSSLCheck((tls = OpenSSL.TLSv1_2_server_method()) != IntPtr.Zero, "TLS_server_method");
OpenSSL.OpenSSLCheck((ctx = OpenSSL.SSL_CTX_new(tls)) != IntPtr.Zero, "SSL_CTX_new");
IntPtr ssl_bio;
OpenSSL.OpenSSLCheck((ssl_bio = OpenSSL.BIO_new_ssl(ctx, 0)) != IntPtr.Zero, "BIO_new_ssl");
OpenSSL.OpenSSLCheck((in_bio = OpenSSL.BIO_new_accept(port)) != IntPtr.Zero, "BIO_new_accept");
OpenSSL.BIO_set_accept_bios(in_bio, ssl_bio);
OpenSSL.OpenSSLCheck(OpenSSL.BIO_do_handshake(in_bio) == 1, "BIO_do_handshake"); // first call sets up the accept socket, subsequent get the connections
}
