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diff --git a/src/transport/ws/websocket.h b/src/transport/ws/websocket.h
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+//
+// Copyright 2017 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2017 Capitar IT Group BV <info@capitar.com>
+//
+// This software is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt).  A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+#ifndef NNG_TRANSPORT_WS_WEBSOCKET_H
+#define NNG_TRANSPORT_WS_WEBSOCKET_H
+
+// TLS transport.  This is used for communication via TLS v1.2 over TCP/IP.
+
+NNG_DECL int nng_ws_register(void);
+
+// TLS options.  Note that these can only be set *before* the endpoint is
+// started.  Once started, it is no longer possible to alter the TLS
+// configuration.
+
+// NNG_OPT_TLS_CA_CERT is a string with one or more X.509 certificates,
+// representing the entire CA chain.  The content may be either PEM or DER
+// encoded.
+#define NNG_OPT_TLS_CA_CERT "tls:ca-cert"
+
+// NNG_OPT_TLS_CRL is a PEM encoded CRL (revocation list).  Multiple lists
+// may be loaded by using this option multiple times.
+#define NNG_OPT_TLS_CRL "tls:crl"
+
+// NNG_OPT_TLS_CERT is used to specify our own certificate. At present
+// only one certificate may be supplied.  (In the future it may be
+// possible to call this multiple times, for servers that select different
+// certificates depending upon client capabilities.)
+#define NNG_OPT_TLS_CERT "tls:cert"
+
+// NNG_OPT_TLS_PRIVATE_KEY is used to specify the private key used
+// with the given certificate.  This should be called after setting
+// the certificate.  The private key may be in PEM or DER format.
+// If in PEM encoded, a terminating ZERO byte should be included.
+#define NNG_OPT_TLS_PRIVATE_KEY "tls:private-key"
+
+// NNG_OPT_TLS_PRIVATE_KEY_PASSWORD is used to specify a password
+// used for the private key.  The value is an ASCIIZ string.
+#define NNG_OPT_TLS_PRIVATE_KEY_PASSWORD "tls:private-key-password"
+
+// NNG_OPT_TLS_AUTH_MODE is an integer indicating whether our
+// peer should be verified or not.  It is required on clients/dialers,
+// and off on servers/listeners, by default.
+#define NNG_OPT_TLS_AUTH_MODE "tls:auth-mode"
+
+extern int nng_tls_auth_mode_required;
+extern int nng_tls_auth_mode_none;
+extern int nng_tls_auth_mode_optional;
+
+// NNG_OPT_TLS_AUTH_VERIFIED is a boolean that can be read on pipes,
+// indicating whether the peer certificate is verified.
+#define NNG_OPT_TLS_AUTH_VERIFIED "tls:auth-verified"
+
+// XXX: TBD: Ciphersuite selection and reporting.  Session reuse?
+
+#endif // NNG_TRANSPORT_WS_WEBSOCKET_H