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<title>GnuTLS-Guile 3.4.8: OpenPGP Authentication Guile Example</title>
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<a name="OpenPGP-Authentication-Guile-Example"></a>
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<p>
Next: <a href="Importing-OpenPGP-Keys-Guile-Example.html#Importing-OpenPGP-Keys-Guile-Example" accesskey="n" rel="next">Importing OpenPGP Keys Guile Example</a>, Previous: <a href="Anonymous-Authentication-Guile-Example.html#Anonymous-Authentication-Guile-Example" accesskey="p" rel="prev">Anonymous 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>
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<hr>
<a name="OpenPGP-Authentication-Guile-Example-1"></a>
<h3 class="section">4.2 OpenPGP Authentication Guile Example</h3>
<p>GnuTLS allows users to authenticate using OpenPGP certificates.
Using OpenPGP-based authentication is not more complicated than using
anonymous authentication. It requires a bit of extra work, though, to
import the OpenPGP public and private key of the client/server. Key
import is omitted here and is left as an exercise to the reader
(see <a href="Importing-OpenPGP-Keys-Guile-Example.html#Importing-OpenPGP-Keys-Guile-Example">Importing OpenPGP Keys Guile Example</a>).
</p>
<p>Assuming <var>some-socket</var> is bound to an open socket port and
<var>pub</var> and <var>sec</var> are bound to the client’s OpenPGP public and
secret key, respectively, client-side code would look like this:
</p>
<a name="index-certificate_002dtype_002fopenpgp"></a>
<div class="example">
<pre class="example">;; Client-side.
(define %certs (list certificate-type/openpgp))
(let ((client (make-session connection-end/client))
(cred (make-certificate-credentials)))
(set-session-default-priority! client)
;; Choose OpenPGP certificates.
(set-session-certificate-type-priority! client %certs)
;; Prepare appropriate client credentials.
(set-certificate-credentials-openpgp-keys! cred pub sec)
(set-session-credentials! client cred)
;; Specify the underlying transport socket.
(set-session-transport-fd! client (fileno some-socket))
(handshake client)
(write "hello, world!" (session-record-port client))
(bye client close-request/rdwr))
</pre></div>
<p>Similarly, server-side code would be along these lines:
</p>
<div class="example">
<pre class="example">;; Server-side.
(define %certs (list certificate-type/openpgp))
(let ((server (make-session connection-end/server))
(dh (make-dh-parameters 1024)))
(set-session-default-priority! server)
;; Choose OpenPGP certificates.
(set-session-certificate-type-priority! server %certs)
(let ((cred (make-certificate-credentials)))
;; Prepare credentials with Diffie-Hellman parameters.
(set-certificate-credentials-dh-parameters! cred dh)
(set-certificate-credentials-openpgp-keys! cred pub sec)
(set-session-credentials! server cred))
(set-session-transport-fd! server (fileno some-socket))
(handshake server)
(let ((msg (read (session-record-port server))))
(format #t "received: ~a~%" msg)
(bye server close-request/rdwr)))
</pre></div>
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