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<title>GnuTLS-Guile 3.5.4: Anonymous Authentication Guile Example</title>
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<a name="Anonymous-Authentication-Guile-Example"></a>
<div class="header">
<p>
Next: <a href="OpenPGP-Authentication-Guile-Example.html#OpenPGP-Authentication-Guile-Example" accesskey="n" rel="next">OpenPGP Authentication Guile Example</a>, Up: <a href="Guile-Examples.html#Guile-Examples" accesskey="u" rel="up">Guile Examples</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Procedure-Index.html#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Anonymous-Authentication-Guile-Example-1"></a>
<h3 class="section">4.1 Anonymous Authentication Guile Example</h3>
<p><em>Anonymous authentication</em> is very easy to use. No certificates
are needed by the communicating parties. Yet, it allows them to
benefit from end-to-end encryption and integrity checks.
</p>
<p>The client-side code would look like this (assuming <var>some-socket</var>
is bound to an open socket port):
</p>
<a name="index-connection_002dend_002fclient"></a>
<a name="index-kx_002fanon_002ddh"></a>
<a name="index-close_002drequest_002frdwr"></a>
<div class="example">
<pre class="example">;; Client-side.
(let ((client (make-session connection-end/client)))
;; Use the default settings.
(set-session-default-priority! client)
;; Don't use certificate-based authentication.
(set-session-certificate-type-priority! client '())
;; Request the "anonymous Diffie-Hellman" key exchange method.
(set-session-kx-priority! client (list kx/anon-dh))
;; Specify the underlying socket.
(set-session-transport-fd! client (fileno some-socket))
;; Create anonymous credentials.
(set-session-credentials! client
(make-anonymous-client-credentials))
;; Perform the TLS handshake with the server.
(handshake client)
;; Send data over the TLS record layer.
(write "hello, world!" (session-record-port client))
;; Terminate the TLS session.
(bye client close-request/rdwr))
</pre></div>
<p>The corresponding server would look like this (again, assuming
<var>some-socket</var> is bound to a socket port):
</p>
<a name="index-connection_002dend_002fserver"></a>
<div class="example">
<pre class="example">;; Server-side.
(let ((server (make-session connection-end/server)))
(set-session-default-priority! server)
(set-session-certificate-type-priority! server '())
(set-session-kx-priority! server (list kx/anon-dh))
;; Specify the underlying transport socket.
(set-session-transport-fd! server (fileno some-socket))
;; Create anonymous credentials.
(let ((cred (make-anonymous-server-credentials))
(dh-params (make-dh-parameters 1024)))
;; Note: DH parameter generation can take some time.
(set-anonymous-server-dh-parameters! cred dh-params)
(set-session-credentials! server cred))
;; Perform the TLS handshake with the client.
(handshake server)
;; Receive data over the TLS record layer.
(let ((message (read (session-record-port server))))
(format #t "received the following message: ~a~%"
message)
(bye server close-request/rdwr)))
</pre></div>
<p>This is it!
</p>
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