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<h1 class="settitle" align="center">GnuTLS-Guile 3.6.14</h1>
<span id="SEC_Contents"></span>
<h2 class="contents-heading">Table of Contents</h2>
<div class="contents">
<ul class="no-bullet">
<li><a id="toc-Preface-1" href="#Preface">1 Preface</a></li>
<li><a id="toc-Guile-Preparations-1" href="#Guile-Preparations">2 Guile Preparations</a></li>
<li><a id="toc-Guile-API-Conventions-1" href="#Guile-API-Conventions">3 Guile API Conventions</a>
<ul class="no-bullet">
<li><a id="toc-Enumerates-and-Constants-1" href="#Enumerates-and-Constants">3.1 Enumerates and Constants</a></li>
<li><a id="toc-Procedure-Names-1" href="#Procedure-Names">3.2 Procedure Names</a></li>
<li><a id="toc-Representation-of-Binary-Data-1" href="#Representation-of-Binary-Data">3.3 Representation of Binary Data</a></li>
<li><a id="toc-Input-and-Output-1" href="#Input-and-Output">3.4 Input and Output</a></li>
<li><a id="toc-Exception-Handling-1" href="#Exception-Handling">3.5 Exception Handling</a></li>
</ul></li>
<li><a id="toc-Guile-Examples-1" href="#Guile-Examples">4 Guile Examples</a>
<ul class="no-bullet">
<li><a id="toc-Anonymous-Authentication-Guile-Example-1" href="#Anonymous-Authentication-Guile-Example">4.1 Anonymous Authentication Guile Example</a></li>
</ul></li>
<li><a id="toc-Guile-Reference-1" href="#Guile-Reference">5 Guile Reference</a></li>
<li><a id="toc-Copying-Information-1" href="#Copying-Information">Appendix A Copying Information</a></li>
<li><a id="toc-Procedure-Index-1" href="#Procedure-Index" rel="index">Procedure Index</a></li>
<li><a id="toc-Concept-Index-1" href="#Concept-Index" rel="index">Concept Index</a></li>
</ul>
</div>
<span id="Top"></span><div class="header">
<p>
Next: <a href="#Preface" accesskey="n" rel="next">Preface</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="GnuTLS_002dGuile"></span><h1 class="top">GnuTLS-Guile</h1>
<p>This manual is last updated 1 June 2020 for version
3.6.14 of GnuTLS.
</p>
<p>Copyright © 2001-2012, 2014, 2016, 2019 Free Software Foundation, Inc.
</p>
<blockquote>
<p>Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
copy of the license is included in the section entitled “GNU Free
Documentation License”.
</p></blockquote>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="#Preface" accesskey="1">Preface</a></td><td> </td><td align="left" valign="top">Preface.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Guile-Preparations" accesskey="2">Guile Preparations</a></td><td> </td><td align="left" valign="top">Note on installation and environment.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Guile-API-Conventions" accesskey="3">Guile API Conventions</a></td><td> </td><td align="left" valign="top">Naming conventions and other idiosyncrasies.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Guile-Examples" accesskey="4">Guile Examples</a></td><td> </td><td align="left" valign="top">Quick start.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Guile-Reference" accesskey="5">Guile Reference</a></td><td> </td><td align="left" valign="top">The Scheme GnuTLS programming interface.
</td></tr>
<tr><th colspan="3" align="left" valign="top"><pre class="menu-comment">
</pre></th></tr><tr><td align="left" valign="top">• <a href="#Copying-Information" accesskey="6">Copying Information</a></td><td> </td><td align="left" valign="top">You can copy and modify this manual.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Procedure-Index" rel="index" accesskey="7">Procedure Index</a></td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="#Concept-Index" rel="index" accesskey="8">Concept Index</a></td><td> </td><td align="left" valign="top">
</td></tr>
</table>
<hr>
<span id="Preface"></span><div class="header">
<p>
Next: <a href="#Guile-Preparations" accesskey="n" rel="next">Guile Preparations</a>, Previous: <a href="#Top" accesskey="p" rel="prev">Top</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Preface-1"></span><h2 class="chapter">1 Preface</h2>
<p>This manual describes the <a href="https://www.gnu.org/software/guile/">GNU Guile</a> Scheme programming interface to GnuTLS, which is distributed
as part of <a href="https://gnutls.org">GnuTLS</a>. The reader is
assumed to have basic knowledge of the protocol and library. Details
missing from this chapter may be found in Function reference,
of the C API reference.
</p>
<p>At this stage, not all the C functions are available from Scheme, but
a large subset thereof is available.
</p>
<hr>
<span id="Guile-Preparations"></span><div class="header">
<p>
Next: <a href="#Guile-API-Conventions" accesskey="n" rel="next">Guile API Conventions</a>, Previous: <a href="#Preface" accesskey="p" rel="prev">Preface</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Guile-Preparations-1"></span><h2 class="chapter">2 Guile Preparations</h2>
<p>The GnuTLS Guile bindings are available for the Guile 3.0 and 2.2
series, as well as the legacy 2.0 and even 1.8 series.
</p>
<p>By default they are installed under the GnuTLS installation directory,
typically <samp>/usr/local/share/guile/site/</samp>). Normally Guile
will not find the module there without help. You may experience
something like this:
</p>
<div class="example">
<pre class="example">$ guile
…
scheme@(guile-user)> (use-modules (gnutls))
ERROR: no code for module (gnutls)
</pre></div>
<p>There are two ways to solve this. The first is to make sure that when
building GnuTLS, the Guile bindings will be installed in the same
place where Guile looks. You may do this by using the
<code>--with-guile-site-dir</code> parameter as follows:
</p>
<div class="example">
<pre class="example">$ ./configure --with-guile-site-dir=no
</pre></div>
<p>This will instruct GnuTLS to attempt to install the Guile bindings
where Guile will look for them. It will use <code>guile-config info
pkgdatadir</code> to learn the path to use.
</p>
<p>If Guile was installed into <code>/usr</code>, you may also install GnuTLS
using the same prefix:
</p>
<div class="example">
<pre class="example">$ ./configure --prefix=/usr
</pre></div>
<p>If you want to specify the path to install the Guile bindings you can
also specify the path directly:
</p>
<div class="example">
<pre class="example">$ ./configure --with-guile-site-dir=/opt/guile/share/guile/site
</pre></div>
<p>The second solution requires some more work but may be easier to use
if you do not have system administrator rights to your machine. You
need to instruct Guile so that it finds the GnuTLS Guile bindings.
Either use the <code>GUILE_LOAD_PATH</code> environment variable as follows:
</p>
<div class="example">
<pre class="example">$ GUILE_LOAD_PATH="/usr/local/share/guile/site:$GUILE_LOAD_PATH" guile
scheme@(guile-user)> (use-modules (gnutls))
scheme@(guile-user)>
</pre></div>
<p>Alternatively, you can modify Guile’s <code>%load-path</code> variable
(see <a href="https://www.gnu.org/software/guile/manual/guile.html#Build-Config">Guile’s run-time options</a> in <cite>The GNU Guile
Reference Manual</cite>).
</p>
<p>At this point, you might get an error regarding
<samp>guile-gnutls-v-2</samp> similar to:
</p>
<div class="example">
<pre class="example">gnutls.scm:361:1: In procedure dynamic-link in expression (load-extension "guile-gnutls-v-2" "scm_init_gnutls"):
gnutls.scm:361:1: file: "guile-gnutls-v-2", message: "guile-gnutls-v-2.so: cannot open shared object file: No such file or directory"
</pre></div>
<p>In this case, you will need to modify the run-time linker path, for
example as follows:
</p>
<div class="example">
<pre class="example">$ LD_LIBRARY_PATH=/usr/local/lib GUILE_LOAD_PATH=/usr/local/share/guile/site guile
scheme@(guile-user)> (use-modules (gnutls))
scheme@(guile-user)>
</pre></div>
<p>To check that you got the intended GnuTLS library version, you may
print the version number of the loaded library as follows:
</p>
<div class="example">
<pre class="example">$ guile
scheme@(guile-user)> (use-modules (gnutls))
scheme@(guile-user)> (gnutls-version)
"3.6.14"
scheme@(guile-user)>
</pre></div>
<hr>
<span id="Guile-API-Conventions"></span><div class="header">
<p>
Next: <a href="#Guile-Examples" accesskey="n" rel="next">Guile Examples</a>, Previous: <a href="#Guile-Preparations" accesskey="p" rel="prev">Guile Preparations</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Guile-API-Conventions-1"></span><h2 class="chapter">3 Guile API Conventions</h2>
<p>This chapter details the conventions used by Guile API, as well as
specificities of the mapping of the C API to Scheme.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="#Enumerates-and-Constants" accesskey="1">Enumerates and Constants</a></td><td> </td><td align="left" valign="top">Representation of C-side constants.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Procedure-Names" accesskey="2">Procedure Names</a></td><td> </td><td align="left" valign="top">Naming conventions.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Representation-of-Binary-Data" accesskey="3">Representation of Binary Data</a></td><td> </td><td align="left" valign="top">Binary data buffers.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Input-and-Output" accesskey="4">Input and Output</a></td><td> </td><td align="left" valign="top">Input and output.
</td></tr>
<tr><td align="left" valign="top">• <a href="#Exception-Handling" accesskey="5">Exception Handling</a></td><td> </td><td align="left" valign="top">Exceptions.
</td></tr>
</table>
<hr>
<span id="Enumerates-and-Constants"></span><div class="header">
<p>
Next: <a href="#Procedure-Names" accesskey="n" rel="next">Procedure Names</a>, Up: <a href="#Guile-API-Conventions" accesskey="u" rel="up">Guile API Conventions</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Enumerates-and-Constants-1"></span><h3 class="section">3.1 Enumerates and Constants</h3>
<span id="index-enumerate"></span>
<span id="index-constant"></span>
<p>Lots of enumerates and constants are used in the GnuTLS C API. For
each C enumerate type, a disjoint Scheme type is used—thus,
enumerate values and constants are not represented by Scheme symbols
nor by integers. This makes it impossible to use an enumerate value
of the wrong type on the Scheme side: such errors are automatically
detected by type-checking.
</p>
<p>The enumerate values are bound to variables exported by the
<code>(gnutls)</code> module. These variables
are named according to the following convention:
</p>
<ul>
<li> All variable names are lower-case; the underscore <code>_</code>
character used in the C API is replaced by hyphen <code>-</code>.
</li><li> All variable names are prepended by the name of the enumerate
type and the slash <code>/</code> character.
</li><li> In some cases, the variable name is made more explicit than the
one of the C API, e.g., by avoid abbreviations.
</li></ul>
<p>Consider for instance this C-side enumerate:
</p>
<div class="example">
<pre class="example">typedef enum
{
GNUTLS_CRD_CERTIFICATE = 1,
GNUTLS_CRD_ANON,
GNUTLS_CRD_SRP,
GNUTLS_CRD_PSK
} gnutls_credentials_type_t;
</pre></div>
<p>The corresponding Scheme values are bound to the following variables
exported by the <code>(gnutls)</code> module:
</p>
<div class="example">
<pre class="example">credentials/certificate
credentials/anonymous
credentials/srp
credentials/psk
</pre></div>
<p>Hopefully, most variable names can be deduced from this convention.
</p>
<p>Scheme-side “enumerate” values can be compared using <code>eq?</code>
(see <a href="https://www.gnu.org/software/guile/manual/guile.html#Equality">equality predicates</a> in <cite>The GNU Guile Reference
Manual</cite>). Consider the following example:
</p>
<span id="index-session_002dcipher"></span>
<div class="example">
<pre class="example">(let ((session (make-session connection-end/client)))
;;
;; ...
;;
;; Check the ciphering algorithm currently used by SESSION.
(if (eq? cipher/arcfour (session-cipher session))
(format #t "We're using the ARCFOUR algorithm")))
</pre></div>
<p>In addition, all enumerate values can be converted to a human-readable
string, in a type-specific way. For instance, <code>(cipher->string
cipher/arcfour)</code> yields <code>"ARCFOUR 128"</code>, while
<code>(key-usage->string key-usage/digital-signature)</code> yields
<code>"digital-signature"</code>. Note that these strings may not be
sufficient for use in a user interface since they are fairly concise
and not internationalized.
</p>
<hr>
<span id="Procedure-Names"></span><div class="header">
<p>
Next: <a href="#Representation-of-Binary-Data" accesskey="n" rel="next">Representation of Binary Data</a>, Previous: <a href="#Enumerates-and-Constants" accesskey="p" rel="prev">Enumerates and Constants</a>, Up: <a href="#Guile-API-Conventions" accesskey="u" rel="up">Guile API Conventions</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Procedure-Names-1"></span><h3 class="section">3.2 Procedure Names</h3>
<p>Unlike C functions in GnuTLS, the corresponding Scheme procedures are
named in a way that is close to natural English. Abbreviations are
also avoided. For instance, the Scheme procedure corresponding to
<code>gnutls_certificate_set_dh_params</code> is named
<code>set-certificate-credentials-dh-parameters!</code>. The <code>gnutls_</code>
prefix is always omitted from variable names since a similar effect
can be achieved using Guile’s nifty binding renaming facilities,
should it be needed (see <a href="https://www.gnu.org/software/guile/manual/guile.html#Using-Guile-Modules">Using Guile Modules</a> in <cite>The GNU
Guile Reference Manual</cite>).
</p>
<p>Often Scheme procedure names differ from C function names in a way
that makes it clearer what objects they operate on. For example, the
Scheme procedure named <code>set-session-transport-port!</code> corresponds
to <code>gnutls_transport_set_ptr</code>, making it clear that this
procedure applies to session.
</p>
<hr>
<span id="Representation-of-Binary-Data"></span><div class="header">
<p>
Next: <a href="#Input-and-Output" accesskey="n" rel="next">Input and Output</a>, Previous: <a href="#Procedure-Names" accesskey="p" rel="prev">Procedure Names</a>, Up: <a href="#Guile-API-Conventions" accesskey="u" rel="up">Guile API Conventions</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Representation-of-Binary-Data-1"></span><h3 class="section">3.3 Representation of Binary Data</h3>
<p>Many procedures operate on binary data. For instance,
<code>pkcs3-import-dh-parameters</code> expects binary data as input.
</p>
<span id="index-bytevectors"></span>
<span id="index-SRFI_002d4"></span>
<span id="index-homogeneous-vector"></span>
<p>Binary data is represented on the Scheme side using bytevectors
(see <a href="https://www.gnu.org/software/guile/manual/guile.html#Bytevectors">Bytevectors</a> in <cite>The GNU Guile Reference Manual</cite>).
Homogeneous vectors such as SRFI-4 <code>u8vector</code>s can also be
used<a id="DOCF1" href="#FOOT1"><sup>1</sup></a>.
</p>
<p>As an example, generating and then exporting Diffie-Hellman parameters
in the PEM format can be done as follows:
</p>
<span id="index-make_002ddh_002dparameters"></span>
<span id="index-pkcs3_002dexport_002ddh_002dparameters"></span>
<span id="index-x509_002dcertificate_002dformat_002fpem"></span>
<div class="example">
<pre class="example">(let* ((dh (make-dh-parameters 1024))
(pem (pkcs3-export-dh-parameters dh
x509-certificate-format/pem)))
(call-with-output-file "some-file.pem"
(lambda (port)
(uniform-vector-write pem port))))
</pre></div>
<hr>
<span id="Input-and-Output"></span><div class="header">
<p>
Next: <a href="#Exception-Handling" accesskey="n" rel="next">Exception Handling</a>, Previous: <a href="#Representation-of-Binary-Data" accesskey="p" rel="prev">Representation of Binary Data</a>, Up: <a href="#Guile-API-Conventions" accesskey="u" rel="up">Guile API Conventions</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Input-and-Output-1"></span><h3 class="section">3.4 Input and Output</h3>
<span id="index-set_002dsession_002dtransport_002dport_0021"></span>
<span id="index-set_002dsession_002dtransport_002dfd_0021"></span>
<p>The underlying transport of a TLS session can be any Scheme
input/output port (see <a href="https://www.gnu.org/software/guile/manual/guile.html#Ports-and-File-Descriptors">Ports and File Descriptors</a> in <cite>The GNU
Guile Reference Manual</cite>). This has to be specified using
<code>set-session-transport-port!</code>.
</p>
<p>However, for better performance, a raw file descriptor can be
specified, using <code>set-session-transport-fd!</code>. For instance, if
the transport layer is a socket port over an OS-provided socket, you
can use the <code>port->fdes</code> or <code>fileno</code> procedure to obtain the
underlying file descriptor and pass it to
<code>set-session-transport-fd!</code> (see <a href="https://www.gnu.org/software/guile/manual/guile.html#Ports-and-File-Descriptors"><code>port->fdes</code> and <code>fileno</code></a> in <cite>The GNU Guile Reference
Manual</cite>). This would work as follows:
</p>
<div class="example">
<pre class="example">(let ((socket (socket PF_INET SOCK_STREAM 0))
(session (make-session connection-end/client)))
;;
;; Establish a TCP connection...
;;
;; Use the file descriptor that underlies SOCKET.
(set-session-transport-fd! session (fileno socket)))
</pre></div>
<span id="index-session_002drecord_002dport"></span>
<p>Once a TLS session is established, data can be communicated through it
(i.e., <em>via</em> the TLS record layer) using the port returned by
<code>session-record-port</code>:
</p>
<div class="example">
<pre class="example">(let ((session (make-session connection-end/client)))
;;
;; Initialize the various parameters of SESSION, set up
;; a network connection, etc.
;;
(let ((i/o (session-record-port session)))
(display "Hello peer!" i/o)
(let ((greetings (read i/o)))
;; …
(bye session close-request/rdwr))))
</pre></div>
<span id="index-buffering"></span>
<p>Note that each write to the session record port leads to the
transmission of an encrypted TLS “Application Data” packet. In the
above example, we create an Application Data packet for the 11 bytes for
the string that we write. This is not efficient both in terms of CPU
usage and bandwidth (each packet adds at least 5 bytes of overhead and
can lead to one <code>write</code> system call), so we recommend that
applications do their own buffering.
</p>
<span id="index-record_002dsend"></span>
<span id="index-record_002dreceive_0021"></span>
<p>A lower-level I/O API is provided by <code>record-send</code> and
<code>record-receive!</code> which take a bytevector (or a SRFI-4 vector) to
represent the data sent or received. While it might improve
performance, it is much less convenient than the session record port and
should rarely be needed.
</p>
<hr>
<span id="Exception-Handling"></span><div class="header">
<p>
Previous: <a href="#Input-and-Output" accesskey="p" rel="prev">Input and Output</a>, Up: <a href="#Guile-API-Conventions" accesskey="u" rel="up">Guile API Conventions</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Exception-Handling-1"></span><h3 class="section">3.5 Exception Handling</h3>
<span id="index-exceptions"></span>
<span id="index-errors"></span>
<span id="index-gnutls_002derror"></span>
<span id="index-error_002d_003estring"></span>
<p>GnuTLS errors are implemented as Scheme exceptions (see <a href="https://www.gnu.org/software/guile/manual/guile.html#Exceptions">exceptions in Guile</a> in <cite>The GNU Guile Reference Manual</cite>). Each
time a GnuTLS function returns an error, an exception with key
<code>gnutls-error</code> is raised. The additional arguments that are
thrown include an error code and the name of the GnuTLS procedure that
raised the exception. The error code is pretty much like an enumerate
value: it is one of the <code>error/</code> variables exported by the
<code>(gnutls)</code> module (see <a href="#Enumerates-and-Constants">Enumerates and Constants</a>). Exceptions
can be turned into error messages using the <code>error->string</code>
procedure.
</p>
<p>The following examples illustrates how GnuTLS exceptions can be
handled:
</p>
<div class="example">
<pre class="example">(let ((session (make-session connection-end/server)))
;;
;; ...
;;
(catch 'gnutls-error
(lambda ()
(handshake session))
(lambda (key err function . currently-unused)
(format (current-error-port)
"a GnuTLS error was raised by `~a': ~a~%"
function (error->string err)))))
</pre></div>
<p>Again, error values can be compared using <code>eq?</code>:
</p>
<div class="example">
<pre class="example"> ;; `gnutls-error' handler.
(lambda (key err function . currently-unused)
(if (eq? err error/fatal-alert-received)
(format (current-error-port)
"a fatal alert was caught!~%")
(format (current-error-port)
"something bad happened: ~a~%"
(error->string err))))
</pre></div>
<p>Note that the <code>catch</code> handler is currently passed only 3
arguments but future versions might provide it with additional
arguments. Thus, it must be prepared to handle more than 3 arguments,
as in this example.
</p>
<hr>
<span id="Guile-Examples"></span><div class="header">
<p>
Next: <a href="#Guile-Reference" accesskey="n" rel="next">Guile Reference</a>, Previous: <a href="#Guile-API-Conventions" accesskey="p" rel="prev">Guile API Conventions</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Guile-Examples-1"></span><h2 class="chapter">4 Guile Examples</h2>
<p>This chapter provides examples that illustrate common use cases.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="#Anonymous-Authentication-Guile-Example" accesskey="1">Anonymous Authentication Guile Example</a></td><td> </td><td align="left" valign="top">Simplest client and server.
</td></tr>
</table>
<hr>
<span id="Anonymous-Authentication-Guile-Example"></span><div class="header">
<p>
Up: <a href="#Guile-Examples" accesskey="u" rel="up">Guile Examples</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Anonymous-Authentication-Guile-Example-1"></span><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>
<span id="index-connection_002dend_002fclient"></span>
<span id="index-kx_002fanon_002ddh"></span>
<span id="index-close_002drequest_002frdwr"></span>
<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>
<span id="index-connection_002dend_002fserver"></span>
<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>
<hr>
<span id="Guile-Reference"></span><div class="header">
<p>
Next: <a href="#Copying-Information" accesskey="n" rel="next">Copying Information</a>, Previous: <a href="#Guile-Examples" accesskey="p" rel="prev">Guile Examples</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Guile-Reference-1"></span><h2 class="chapter">5 Guile Reference</h2>
<p>This chapter lists the GnuTLS Scheme procedures exported by the
<code>(gnutls)</code> module (see <a href="https://www.gnu.org/software/guile/manual/guile.html#The-Guile-module-system">The Guile module system</a> in <cite>The
GNU Guile Reference Manual</cite>).
</p>
<dl>
<dt id="index-set_002dlog_002dlevel_0021">Scheme Procedure: <strong>set-log-level!</strong> <em>level</em></dt>
<dd><p>Enable GnuTLS logging up to <var>level</var> (an integer).
</p></dd></dl>
<dl>
<dt id="index-set_002dlog_002dprocedure_0021">Scheme Procedure: <strong>set-log-procedure!</strong> <em>proc</em></dt>
<dd><p>Use <var>proc</var> (a two-argument procedure) as the global GnuTLS log procedure.
</p></dd></dl>
<dl>
<dt id="index-_0025set_002dcertificate_002dcredentials_002dopenpgp_002dkeys_0021">Scheme Procedure: <strong>%set-certificate-credentials-openpgp-keys!</strong> <em>cred pub sec</em></dt>
<dd><p>Use certificate <var>pub</var> and secret key <var>sec</var> in certificate credentials <var>cred</var>.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dkeyring_002dcontains_002dkey_002did_003f">Scheme Procedure: <strong>%openpgp-keyring-contains-key-id?</strong> <em>keyring id</em></dt>
<dd><p>Return <code>#f</code> if key ID <var>id</var> is in <var>keyring</var>, <code>#f</code> otherwise.
</p></dd></dl>
<dl>
<dt id="index-import_002dopenpgp_002dkeyring">Scheme Procedure: <strong>import-openpgp-keyring</strong> <em>data format</em></dt>
<dd><p>Import <var>data</var> (a u8vector) according to <var>format</var> and return the imported keyring.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002dusage">Scheme Procedure: <strong>%openpgp-certificate-usage</strong> <em>key</em></dt>
<dd><p>Return a list of values denoting the key usage of <var>key</var>.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002dversion">Scheme Procedure: <strong>%openpgp-certificate-version</strong> <em>key</em></dt>
<dd><p>Return the version of the OpenPGP message format (RFC2440) honored by <var>key</var>.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002dalgorithm">Scheme Procedure: <strong>%openpgp-certificate-algorithm</strong> <em>key</em></dt>
<dd><p>Return two values: the certificate algorithm used by <var>key</var> and the number of bits used.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002dnames">Scheme Procedure: <strong>%openpgp-certificate-names</strong> <em>key</em></dt>
<dd><p>Return the list of names for <var>key</var>.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002dname">Scheme Procedure: <strong>%openpgp-certificate-name</strong> <em>key index</em></dt>
<dd><p>Return the <var>index</var>th name of <var>key</var>.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002dfingerprint">Scheme Procedure: <strong>%openpgp-certificate-fingerprint</strong> <em>key</em></dt>
<dd><p>Return a new u8vector denoting the fingerprint of <var>key</var>.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002dfingerprint_0021">Scheme Procedure: <strong>%openpgp-certificate-fingerprint!</strong> <em>key fpr</em></dt>
<dd><p>Store in <var>fpr</var> (a u8vector) the fingerprint of <var>key</var>. Return the number of bytes stored in <var>fpr</var>.
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002did_0021">Scheme Procedure: <strong>%openpgp-certificate-id!</strong> <em>key id</em></dt>
<dd><p>Store the ID (an 8 byte sequence) of certificate <var>key</var> in <var>id</var> (a u8vector).
</p></dd></dl>
<dl>
<dt id="index-_0025openpgp_002dcertificate_002did">Scheme Procedure: <strong>%openpgp-certificate-id</strong> <em>key</em></dt>
<dd><p>Return the ID (an 8-element u8vector) of certificate <var>key</var>.
</p></dd></dl>
<dl>
<dt id="index-_0025import_002dopenpgp_002dprivate_002dkey">Scheme Procedure: <strong>%import-openpgp-private-key</strong> <em>data format [pass]</em></dt>
<dd><p>Return a new OpenPGP private key object resulting from the import of <var>data</var> (a uniform array) according to <var>format</var>. Optionally, a passphrase may be provided.
</p></dd></dl>
<dl>
<dt id="index-_0025import_002dopenpgp_002dcertificate">Scheme Procedure: <strong>%import-openpgp-certificate</strong> <em>data format</em></dt>
<dd><p>Return a new OpenPGP certificate object resulting from the import of <var>data</var> (a uniform array) according to <var>format</var>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dsubject_002dalternative_002dname">Scheme Procedure: <strong>x509-certificate-subject-alternative-name</strong> <em>cert index</em></dt>
<dd><p>Return two values: the alternative name type for <var>cert</var> (i.e., one of the <code>x509-subject-alternative-name/</code> values) and the actual subject alternative name (a string) at <var>index</var>. Both values are <code>#f</code> if no alternative name is available at <var>index</var>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dsubject_002dkey_002did">Scheme Procedure: <strong>x509-certificate-subject-key-id</strong> <em>cert</em></dt>
<dd><p>Return the subject key ID (a u8vector) for <var>cert</var>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dauthority_002dkey_002did">Scheme Procedure: <strong>x509-certificate-authority-key-id</strong> <em>cert</em></dt>
<dd><p>Return the key ID (a u8vector) of the X.509 certificate authority of <var>cert</var>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dkey_002did">Scheme Procedure: <strong>x509-certificate-key-id</strong> <em>cert</em></dt>
<dd><p>Return a statistically unique ID (a u8vector) for <var>cert</var> that depends on its public key parameters. This is normally a 20-byte SHA-1 hash.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dversion">Scheme Procedure: <strong>x509-certificate-version</strong> <em>cert</em></dt>
<dd><p>Return the version of <var>cert</var>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dkey_002dusage">Scheme Procedure: <strong>x509-certificate-key-usage</strong> <em>cert</em></dt>
<dd><p>Return the key usage of <var>cert</var> (i.e., a list of <code>key-usage/</code> values), or the empty list if <var>cert</var> does not contain such information.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dpublic_002dkey_002dalgorithm">Scheme Procedure: <strong>x509-certificate-public-key-algorithm</strong> <em>cert</em></dt>
<dd><p>Return two values: the public key algorithm (i.e., one of the <code>pk-algorithm/</code> values) of <var>cert</var> and the number of bits used.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dsignature_002dalgorithm">Scheme Procedure: <strong>x509-certificate-signature-algorithm</strong> <em>cert</em></dt>
<dd><p>Return the signature algorithm used by <var>cert</var> (i.e., one of the <code>sign-algorithm/</code> values).
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dmatches_002dhostname_003f">Scheme Procedure: <strong>x509-certificate-matches-hostname?</strong> <em>cert hostname</em></dt>
<dd><p>Return true if <var>cert</var> matches <var>hostname</var>, a string denoting a DNS host name. This is the basic implementation of <a href="https://tools.ietf.org/html/rfc2818">RFC 2818</a> (aka. HTTPS).
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dissuer_002ddn_002doid">Scheme Procedure: <strong>x509-certificate-issuer-dn-oid</strong> <em>cert index</em></dt>
<dd><p>Return the OID (a string) at <var>index</var> from <var>cert</var>’s issuer DN. Return <code>#f</code> if no OID is available at <var>index</var>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002ddn_002doid">Scheme Procedure: <strong>x509-certificate-dn-oid</strong> <em>cert index</em></dt>
<dd><p>Return OID (a string) at <var>index</var> from <var>cert</var>. Return <code>#f</code> if no OID is available at <var>index</var>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dissuer_002ddn">Scheme Procedure: <strong>x509-certificate-issuer-dn</strong> <em>cert</em></dt>
<dd><p>Return the distinguished name (DN) of X.509 certificate <var>cert</var>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002ddn">Scheme Procedure: <strong>x509-certificate-dn</strong> <em>cert</em></dt>
<dd><p>Return the distinguished name (DN) of X.509 certificate <var>cert</var>. The form of the DN is as described in <a href="https://tools.ietf.org/html/rfc2253">RFC 2253</a>.
</p></dd></dl>
<dl>
<dt id="index-pkcs8_002dimport_002dx509_002dprivate_002dkey">Scheme Procedure: <strong>pkcs8-import-x509-private-key</strong> <em>data format [pass [encrypted]]</em></dt>
<dd><p>Return a new X.509 private key object resulting from the import of <var>data</var> (a uniform array) according to <var>format</var>. Optionally, if <var>pass</var> is not <code>#f</code>, it should be a string denoting a passphrase. <var>encrypted</var> tells whether the private key is encrypted (<code>#t</code> by default).
</p></dd></dl>
<dl>
<dt id="index-import_002dx509_002dprivate_002dkey">Scheme Procedure: <strong>import-x509-private-key</strong> <em>data format</em></dt>
<dd><p>Return a new X.509 private key object resulting from the import of <var>data</var> (a uniform array) according to <var>format</var>.
</p></dd></dl>
<dl>
<dt id="index-import_002dx509_002dcertificate">Scheme Procedure: <strong>import-x509-certificate</strong> <em>data format</em></dt>
<dd><p>Return a new X.509 certificate object resulting from the import of <var>data</var> (a uniform array) according to <var>format</var>.
</p></dd></dl>
<dl>
<dt id="index-server_002dsession_002dpsk_002dusername">Scheme Procedure: <strong>server-session-psk-username</strong> <em>session</em></dt>
<dd><p>Return the username associated with PSK server session <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dpsk_002dclient_002dcredentials_0021">Scheme Procedure: <strong>set-psk-client-credentials!</strong> <em>cred username key key-format</em></dt>
<dd><p>Set the client credentials for <var>cred</var>, a PSK client credentials object.
</p></dd></dl>
<dl>
<dt id="index-make_002dpsk_002dclient_002dcredentials">Scheme Procedure: <strong>make-psk-client-credentials</strong></dt>
<dd><p>Return a new PSK client credentials object.
</p></dd></dl>
<dl>
<dt id="index-set_002dpsk_002dserver_002dcredentials_002dfile_0021">Scheme Procedure: <strong>set-psk-server-credentials-file!</strong> <em>cred file</em></dt>
<dd><p>Use <var>file</var> as the password file for PSK server credentials <var>cred</var>.
</p></dd></dl>
<dl>
<dt id="index-make_002dpsk_002dserver_002dcredentials">Scheme Procedure: <strong>make-psk-server-credentials</strong></dt>
<dd><p>Return new PSK server credentials.
</p></dd></dl>
<dl>
<dt id="index-peer_002dcertificate_002dstatus">Scheme Procedure: <strong>peer-certificate-status</strong> <em>session</em></dt>
<dd><p>Verify the peer certificate for <var>session</var> and return a list of <code>certificate-status</code> values (such as <code>certificate-status/revoked</code>), or the empty list if the certificate is valid.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dverify_002dflags_0021">Scheme Procedure: <strong>set-certificate-credentials-verify-flags!</strong> <em>cred [flags...]</em></dt>
<dd><p>Set the certificate verification flags to <var>flags</var>, a series of <code>certificate-verify</code> values.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dverify_002dlimits_0021">Scheme Procedure: <strong>set-certificate-credentials-verify-limits!</strong> <em>cred max-bits max-depth</em></dt>
<dd><p>Set the verification limits of <code>peer-certificate-status</code> for certificate credentials <var>cred</var> to <var>max_bits</var> bits for an acceptable certificate and <var>max_depth</var> as the maximum depth of a certificate chain.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dx509_002dkeys_0021">Scheme Procedure: <strong>set-certificate-credentials-x509-keys!</strong> <em>cred certs privkey</em></dt>
<dd><p>Have certificate credentials <var>cred</var> use the X.509 certificates listed in <var>certs</var> and X.509 private key <var>privkey</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dx509_002dkey_002ddata_0021">Scheme Procedure: <strong>set-certificate-credentials-x509-key-data!</strong> <em>cred cert key format</em></dt>
<dd><p>Use X.509 certificate <var>cert</var> and private key <var>key</var>, both uniform arrays containing the X.509 certificate and key in format <var>format</var>, for certificate credentials <var>cred</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dx509_002dcrl_002ddata_0021">Scheme Procedure: <strong>set-certificate-credentials-x509-crl-data!</strong> <em>cred data format</em></dt>
<dd><p>Use <var>data</var> (a uniform array) as the X.509 CRL (certificate revocation list) database for <var>cred</var>. On success, return the number of CRLs processed.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dx509_002dtrust_002ddata_0021">Scheme Procedure: <strong>set-certificate-credentials-x509-trust-data!</strong> <em>cred data format</em></dt>
<dd><p>Use <var>data</var> (a uniform array) as the X.509 trust database for <var>cred</var>. On success, return the number of certificates processed.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dx509_002dcrl_002dfile_0021">Scheme Procedure: <strong>set-certificate-credentials-x509-crl-file!</strong> <em>cred file format</em></dt>
<dd><p>Use <var>file</var> as the X.509 CRL (certificate revocation list) file for certificate credentials <var>cred</var>. On success, return the number of CRLs processed.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dx509_002dtrust_002dfile_0021">Scheme Procedure: <strong>set-certificate-credentials-x509-trust-file!</strong> <em>cred file format</em></dt>
<dd><p>Use <var>file</var> as the X.509 trust file for certificate credentials <var>cred</var>. On success, return the number of certificates processed.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002dx509_002dkey_002dfiles_0021">Scheme Procedure: <strong>set-certificate-credentials-x509-key-files!</strong> <em>cred cert-file key-file format</em></dt>
<dd><p>Use <var>file</var> as the password file for PSK server credentials <var>cred</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dcertificate_002dcredentials_002ddh_002dparameters_0021">Scheme Procedure: <strong>set-certificate-credentials-dh-parameters!</strong> <em>cred dh-params</em></dt>
<dd><p>Use Diffie-Hellman parameters <var>dh_params</var> for certificate credentials <var>cred</var>.
</p></dd></dl>
<dl>
<dt id="index-make_002dcertificate_002dcredentials">Scheme Procedure: <strong>make-certificate-credentials</strong></dt>
<dd><p>Return new certificate credentials (i.e., for use with either X.509 or OpenPGP certificates.
</p></dd></dl>
<dl>
<dt id="index-set_002danonymous_002dserver_002ddh_002dparameters_0021">Scheme Procedure: <strong>set-anonymous-server-dh-parameters!</strong> <em>cred dh-params</em></dt>
<dd><p>Set the Diffie-Hellman parameters of anonymous server credentials <var>cred</var>.
</p></dd></dl>
<dl>
<dt id="index-make_002danonymous_002dclient_002dcredentials">Scheme Procedure: <strong>make-anonymous-client-credentials</strong></dt>
<dd><p>Return anonymous client credentials.
</p></dd></dl>
<dl>
<dt id="index-make_002danonymous_002dserver_002dcredentials">Scheme Procedure: <strong>make-anonymous-server-credentials</strong></dt>
<dd><p>Return anonymous server credentials.
</p></dd></dl>
<dl>
<dt id="index-set_002dsession_002ddh_002dprime_002dbits_0021">Scheme Procedure: <strong>set-session-dh-prime-bits!</strong> <em>session bits</em></dt>
<dd><p>Use <var>bits</var> DH prime bits for <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-pkcs3_002dexport_002ddh_002dparameters-1">Scheme Procedure: <strong>pkcs3-export-dh-parameters</strong> <em>dh-params format</em></dt>
<dd><p>Export Diffie-Hellman parameters <var>dh_params</var> in PKCS3 format according for <var>format</var> (an <code>x509-certificate-format</code> value). Return a <code>u8vector</code> containing the result.
</p></dd></dl>
<dl>
<dt id="index-pkcs3_002dimport_002ddh_002dparameters">Scheme Procedure: <strong>pkcs3-import-dh-parameters</strong> <em>array format</em></dt>
<dd><p>Import Diffie-Hellman parameters in PKCS3 format (further specified by <var>format</var>, an <code>x509-certificate-format</code> value) from <var>array</var> (a homogeneous array) and return a new <code>dh-params</code> object.
</p></dd></dl>
<dl>
<dt id="index-make_002ddh_002dparameters-1">Scheme Procedure: <strong>make-dh-parameters</strong> <em>bits</em></dt>
<dd><p>Return new Diffie-Hellman parameters.
</p></dd></dl>
<dl>
<dt id="index-set_002dsession_002dtransport_002dport_0021-1">Scheme Procedure: <strong>set-session-transport-port!</strong> <em>session port</em></dt>
<dd><p>Use <var>port</var> as the input/output port for <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsession_002dtransport_002dfd_0021-1">Scheme Procedure: <strong>set-session-transport-fd!</strong> <em>session fd</em></dt>
<dd><p>Use file descriptor <var>fd</var> as the underlying transport for <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-session_002drecord_002dport-1">Scheme Procedure: <strong>session-record-port</strong> <em>session</em></dt>
<dd><p>Return a read-write port that may be used to communicate over <var>session</var>. All invocations of <code>session-port</code> on a given session return the same object (in the sense of <code>eq?</code>).
</p></dd></dl>
<dl>
<dt id="index-record_002dreceive_0021-1">Scheme Procedure: <strong>record-receive!</strong> <em>session array</em></dt>
<dd><p>Receive data from <var>session</var> into <var>array</var>, a uniform homogeneous array. Return the number of bytes actually received.
</p></dd></dl>
<dl>
<dt id="index-record_002dsend-1">Scheme Procedure: <strong>record-send</strong> <em>session array</em></dt>
<dd><p>Send the record constituted by <var>array</var> through <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-set_002dsession_002dserver_002dname_0021">Scheme Procedure: <strong>set-session-server-name!</strong> <em>session type name</em></dt>
<dd><p>For a client, this procedure provides a way to inform the server that it is known under <var>name</var>, <i>via</i> the <code>SERVER NAME</code> TLS extension. <var>type</var> must be a <code>server-name-type</code> value, <var>server-name-type/dns</var> for DNS names.
</p></dd></dl>
<dl>
<dt id="index-set_002dsession_002dcredentials_0021">Scheme Procedure: <strong>set-session-credentials!</strong> <em>session cred</em></dt>
<dd><p>Use <var>cred</var> as <var>session</var>’s credentials.
</p></dd></dl>
<dl>
<dt id="index-cipher_002dsuite_002d_003estring">Scheme Procedure: <strong>cipher-suite->string</strong> <em>kx cipher mac</em></dt>
<dd><p>Return the name of the given cipher suite.
</p></dd></dl>
<dl>
<dt id="index-set_002dsession_002dpriorities_0021">Scheme Procedure: <strong>set-session-priorities!</strong> <em>session priorities</em></dt>
<dd><p>Have <var>session</var> use the given <var>priorities</var> for the ciphers, key exchange methods, MACs and compression methods. <var>priorities</var> must be a string (see <a href="https://www.gnu.org/software/gnutls/manual/gnutls.html#Priority-Strings">Priority Strings</a> in <cite>GnuTLS, Transport Layer Security Library for the GNU system</cite>). When <var>priorities</var> cannot be parsed, an <code>error/invalid-request</code> error is raised, with an extra argument indication the position of the error.
</p>
</dd></dl>
<dl>
<dt id="index-set_002dsession_002ddefault_002dpriority_0021">Scheme Procedure: <strong>set-session-default-priority!</strong> <em>session</em></dt>
<dd><p>Have <var>session</var> use the default priorities.
</p></dd></dl>
<dl>
<dt id="index-set_002dserver_002dsession_002dcertificate_002drequest_0021">Scheme Procedure: <strong>set-server-session-certificate-request!</strong> <em>session request</em></dt>
<dd><p>Tell how <var>session</var>, a server-side session, should deal with certificate requests. <var>request</var> should be either <code>certificate-request/request</code> or <code>certificate-request/require</code>.
</p></dd></dl>
<dl>
<dt id="index-session_002dour_002dcertificate_002dchain">Scheme Procedure: <strong>session-our-certificate-chain</strong> <em>session</em></dt>
<dd><p>Return our certificate chain for <var>session</var> (as sent to the peer) in raw format (a u8vector). In the case of OpenPGP there is exactly one certificate. Return the empty list if no certificate was used.
</p></dd></dl>
<dl>
<dt id="index-session_002dpeer_002dcertificate_002dchain">Scheme Procedure: <strong>session-peer-certificate-chain</strong> <em>session</em></dt>
<dd><p>Return the a list of certificates in raw format (u8vectors) where the first one is the peer’s certificate. In the case of OpenPGP, there is always exactly one certificate. In the case of X.509, subsequent certificates indicate form a certificate chain. Return the empty list if no certificate was sent.
</p></dd></dl>
<dl>
<dt id="index-session_002dclient_002dauthentication_002dtype">Scheme Procedure: <strong>session-client-authentication-type</strong> <em>session</em></dt>
<dd><p>Return the client authentication type (a <code>credential-type</code> value) used in <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-session_002dserver_002dauthentication_002dtype">Scheme Procedure: <strong>session-server-authentication-type</strong> <em>session</em></dt>
<dd><p>Return the server authentication type (a <code>credential-type</code> value) used in <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-session_002dauthentication_002dtype">Scheme Procedure: <strong>session-authentication-type</strong> <em>session</em></dt>
<dd><p>Return the authentication type (a <code>credential-type</code> value) used by <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-session_002dprotocol">Scheme Procedure: <strong>session-protocol</strong> <em>session</em></dt>
<dd><p>Return the protocol used by <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-session_002dcertificate_002dtype">Scheme Procedure: <strong>session-certificate-type</strong> <em>session</em></dt>
<dd><p>Return <var>session</var>’s certificate type.
</p></dd></dl>
<dl>
<dt id="index-session_002dcompression_002dmethod">Scheme Procedure: <strong>session-compression-method</strong> <em>session</em></dt>
<dd><p>Return <var>session</var>’s compression method.
</p></dd></dl>
<dl>
<dt id="index-session_002dmac">Scheme Procedure: <strong>session-mac</strong> <em>session</em></dt>
<dd><p>Return <var>session</var>’s MAC.
</p></dd></dl>
<dl>
<dt id="index-session_002dkx">Scheme Procedure: <strong>session-kx</strong> <em>session</em></dt>
<dd><p>Return <var>session</var>’s kx.
</p></dd></dl>
<dl>
<dt id="index-session_002dcipher-1">Scheme Procedure: <strong>session-cipher</strong> <em>session</em></dt>
<dd><p>Return <var>session</var>’s cipher.
</p></dd></dl>
<dl>
<dt id="index-alert_002dsend">Scheme Procedure: <strong>alert-send</strong> <em>session level alert</em></dt>
<dd><p>Send <var>alert</var> via <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-alert_002dget">Scheme Procedure: <strong>alert-get</strong> <em>session</em></dt>
<dd><p>Get an aleter from <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-reauthenticate">Scheme Procedure: <strong>reauthenticate</strong> <em>session</em></dt>
<dd><p>Perform a re-authentication step for <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-rehandshake">Scheme Procedure: <strong>rehandshake</strong> <em>session</em></dt>
<dd><p>Perform a re-handshaking for <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-handshake">Scheme Procedure: <strong>handshake</strong> <em>session</em></dt>
<dd><p>Perform a handshake for <var>session</var>.
</p></dd></dl>
<dl>
<dt id="index-bye">Scheme Procedure: <strong>bye</strong> <em>session how</em></dt>
<dd><p>Close <var>session</var> according to <var>how</var>.
</p></dd></dl>
<dl>
<dt id="index-make_002dsession">Scheme Procedure: <strong>make-session</strong> <em>end [flags...]</em></dt>
<dd><p>Return a new session for connection end <var>end</var>, either <code>connection-end/server</code> or <code>connection-end/client</code>. The optional <var>flags</var> arguments are <code>connection-flag</code> values such as <code>connection-flag/auto-reauth</code>.
</p></dd></dl>
<dl>
<dt id="index-gnutls_002dversion">Scheme Procedure: <strong>gnutls-version</strong></dt>
<dd><p>Return a string denoting the version number of the underlying GnuTLS library, e.g., <code>"1.7.2"</code>.
</p></dd></dl>
<dl>
<dt id="index-openpgp_002dkeyring_003f">Scheme Procedure: <strong>openpgp-keyring?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>openpgp-keyring</code>.
</p></dd></dl>
<dl>
<dt id="index-openpgp_002dprivate_002dkey_003f">Scheme Procedure: <strong>openpgp-private-key?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>openpgp-private-key</code>.
</p></dd></dl>
<dl>
<dt id="index-openpgp_002dcertificate_003f">Scheme Procedure: <strong>openpgp-certificate?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>openpgp-certificate</code>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dprivate_002dkey_003f">Scheme Procedure: <strong>x509-private-key?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>x509-private-key</code>.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_003f">Scheme Procedure: <strong>x509-certificate?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>x509-certificate</code>.
</p></dd></dl>
<dl>
<dt id="index-psk_002dclient_002dcredentials_003f">Scheme Procedure: <strong>psk-client-credentials?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>psk-client-credentials</code>.
</p></dd></dl>
<dl>
<dt id="index-psk_002dserver_002dcredentials_003f">Scheme Procedure: <strong>psk-server-credentials?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>psk-server-credentials</code>.
</p></dd></dl>
<dl>
<dt id="index-srp_002dclient_002dcredentials_003f">Scheme Procedure: <strong>srp-client-credentials?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>srp-client-credentials</code>.
</p></dd></dl>
<dl>
<dt id="index-srp_002dserver_002dcredentials_003f">Scheme Procedure: <strong>srp-server-credentials?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>srp-server-credentials</code>.
</p></dd></dl>
<dl>
<dt id="index-certificate_002dcredentials_003f">Scheme Procedure: <strong>certificate-credentials?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>certificate-credentials</code>.
</p></dd></dl>
<dl>
<dt id="index-dh_002dparameters_003f">Scheme Procedure: <strong>dh-parameters?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>dh-parameters</code>.
</p></dd></dl>
<dl>
<dt id="index-anonymous_002dserver_002dcredentials_003f">Scheme Procedure: <strong>anonymous-server-credentials?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>anonymous-server-credentials</code>.
</p></dd></dl>
<dl>
<dt id="index-anonymous_002dclient_002dcredentials_003f">Scheme Procedure: <strong>anonymous-client-credentials?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>anonymous-client-credentials</code>.
</p></dd></dl>
<dl>
<dt id="index-session_003f">Scheme Procedure: <strong>session?</strong> <em>obj</em></dt>
<dd><p>Return true if <var>obj</var> is of type <code>session</code>.
</p></dd></dl>
<dl>
<dt id="index-openpgp_002dcertificate_002dformat_002d_003estring">Scheme Procedure: <strong>openpgp-certificate-format->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>openpgp-certificate-format</code> value.
</p></dd></dl>
<dl>
<dt id="index-error_002d_003estring-1">Scheme Procedure: <strong>error->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>error</code> value.
</p></dd></dl>
<dl>
<dt id="index-certificate_002dverify_002d_003estring">Scheme Procedure: <strong>certificate-verify->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>certificate-verify</code> value.
</p></dd></dl>
<dl>
<dt id="index-key_002dusage_002d_003estring">Scheme Procedure: <strong>key-usage->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>key-usage</code> value.
</p></dd></dl>
<dl>
<dt id="index-psk_002dkey_002dformat_002d_003estring">Scheme Procedure: <strong>psk-key-format->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>psk-key-format</code> value.
</p></dd></dl>
<dl>
<dt id="index-server_002dname_002dtype_002d_003estring">Scheme Procedure: <strong>server-name-type->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>server-name-type</code> value.
</p></dd></dl>
<dl>
<dt id="index-sign_002dalgorithm_002d_003estring">Scheme Procedure: <strong>sign-algorithm->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>sign-algorithm</code> value.
</p></dd></dl>
<dl>
<dt id="index-pk_002dalgorithm_002d_003estring">Scheme Procedure: <strong>pk-algorithm->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>pk-algorithm</code> value.
</p></dd></dl>
<dl>
<dt id="index-x509_002dsubject_002dalternative_002dname_002d_003estring">Scheme Procedure: <strong>x509-subject-alternative-name->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>x509-subject-alternative-name</code> value.
</p></dd></dl>
<dl>
<dt id="index-x509_002dcertificate_002dformat_002d_003estring">Scheme Procedure: <strong>x509-certificate-format->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>x509-certificate-format</code> value.
</p></dd></dl>
<dl>
<dt id="index-certificate_002dtype_002d_003estring">Scheme Procedure: <strong>certificate-type->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>certificate-type</code> value.
</p></dd></dl>
<dl>
<dt id="index-protocol_002d_003estring">Scheme Procedure: <strong>protocol->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>protocol</code> value.
</p></dd></dl>
<dl>
<dt id="index-close_002drequest_002d_003estring">Scheme Procedure: <strong>close-request->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>close-request</code> value.
</p></dd></dl>
<dl>
<dt id="index-certificate_002drequest_002d_003estring">Scheme Procedure: <strong>certificate-request->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>certificate-request</code> value.
</p></dd></dl>
<dl>
<dt id="index-certificate_002dstatus_002d_003estring">Scheme Procedure: <strong>certificate-status->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>certificate-status</code> value.
</p></dd></dl>
<dl>
<dt id="index-handshake_002ddescription_002d_003estring">Scheme Procedure: <strong>handshake-description->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>handshake-description</code> value.
</p></dd></dl>
<dl>
<dt id="index-alert_002ddescription_002d_003estring">Scheme Procedure: <strong>alert-description->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>alert-description</code> value.
</p></dd></dl>
<dl>
<dt id="index-alert_002dlevel_002d_003estring">Scheme Procedure: <strong>alert-level->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>alert-level</code> value.
</p></dd></dl>
<dl>
<dt id="index-connection_002dflag_002d_003estring">Scheme Procedure: <strong>connection-flag->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>connection-flag</code> value.
</p></dd></dl>
<dl>
<dt id="index-connection_002dend_002d_003estring">Scheme Procedure: <strong>connection-end->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>connection-end</code> value.
</p></dd></dl>
<dl>
<dt id="index-compression_002dmethod_002d_003estring">Scheme Procedure: <strong>compression-method->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>compression-method</code> value.
</p></dd></dl>
<dl>
<dt id="index-digest_002d_003estring">Scheme Procedure: <strong>digest->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>digest</code> value.
</p></dd></dl>
<dl>
<dt id="index-mac_002d_003estring">Scheme Procedure: <strong>mac->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>mac</code> value.
</p></dd></dl>
<dl>
<dt id="index-credentials_002d_003estring">Scheme Procedure: <strong>credentials->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>credentials</code> value.
</p></dd></dl>
<dl>
<dt id="index-params_002d_003estring">Scheme Procedure: <strong>params->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>params</code> value.
</p></dd></dl>
<dl>
<dt id="index-kx_002d_003estring">Scheme Procedure: <strong>kx->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>kx</code> value.
</p></dd></dl>
<dl>
<dt id="index-cipher_002d_003estring">Scheme Procedure: <strong>cipher->string</strong> <em>enumval</em></dt>
<dd><p>Return a string describing <var>enumval</var>, a <code>cipher</code> value.
</p></dd></dl>
<hr>
<span id="Copying-Information"></span><div class="header">
<p>
Next: <a href="#Procedure-Index" accesskey="n" rel="next">Procedure Index</a>, Previous: <a href="#Guile-Reference" accesskey="p" rel="prev">Guile Reference</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Copying-Information-1"></span><h2 class="appendix">Appendix A Copying Information</h2>
<span id="index-FDL_002c-GNU-Free-Documentation-License"></span>
<span id="GNU-Free-Documentation-License"></span><h3 class="heading">GNU Free Documentation License</h3>
<div align="center">Version 1.3, 3 November 2008
</div>
<div class="display">
<pre class="display">Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
<a href="https://fsf.org/">https://fsf.org/</a>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
</pre></div>
<ol start="0">
<li> PREAMBLE
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for modifications made by others.
</p>
<p>This License is a kind of “copyleft”, which means that derivative
works of the document must themselves be free in the same sense. It
complements the GNU General Public License, which is a copyleft
license designed for free software.
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<p>We have designed this License in order to use it for manuals for free
software, because free software needs free documentation: a free
program should come with manuals providing the same freedoms that the
software does. But this License is not limited to software manuals;
it can be used for any textual work, regardless of subject matter or
whether it is published as a printed book. We recommend this License
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<p>A “Modified Version” of the Document means any work containing the
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<p>A “Secondary Section” is a named appendix or a front-matter section
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<p>The “Cover Texts” are certain short passages of text that are listed,
as Front-Cover Texts or Back-Cover Texts, in the notice that says that
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<p>A “Transparent” copy of the Document means a machine-readable copy,
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<p>Examples of suitable formats for Transparent copies include plain
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</p>
<p>The “Title Page” means, for a printed book, the title page itself,
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<p>A section “Entitled XYZ” means a named subunit of the Document whose
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<p>The Document may include Warranty Disclaimers next to the notice which
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</li><li> VERBATIM COPYING
<p>You may copy and distribute the Document in any medium, either
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</li><li> COPYING IN QUANTITY
<p>If you publish printed copies (or copies in media that commonly have
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<p>If the required texts for either cover are too voluminous to fit
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<p>If you publish or distribute Opaque copies of the Document numbering
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<p>It is requested, but not required, that you contact the authors of the
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</li><li> MODIFICATIONS
<p>You may copy and distribute a Modified Version of the Document under
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and modification of the Modified Version to whoever possesses a copy
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</p>
<ol type="A" start="1">
<li> Use in the Title Page (and on the covers, if any) a title distinct
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(which should, if there were any, be listed in the History section
of the Document). You may use the same title as a previous version
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</li><li> List on the Title Page, as authors, one or more persons or entities
responsible for authorship of the modifications in the Modified
Version, together with at least five of the principal authors of the
Document (all of its principal authors, if it has fewer than five),
unless they release you from this requirement.
</li><li> State on the Title page the name of the publisher of the
Modified Version, as the publisher.
</li><li> Preserve all the copyright notices of the Document.
</li><li> Add an appropriate copyright notice for your modifications
adjacent to the other copyright notices.
</li><li> Include, immediately after the copyright notices, a license notice
giving the public permission to use the Modified Version under the
terms of this License, in the form shown in the Addendum below.
</li><li> Preserve in that license notice the full lists of Invariant Sections
and required Cover Texts given in the Document’s license notice.
</li><li> Include an unaltered copy of this License.
</li><li> Preserve the section Entitled “History”, Preserve its Title, and add
to it an item stating at least the title, year, new authors, and
publisher of the Modified Version as given on the Title Page. If
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</li><li> Preserve the network location, if any, given in the Document for
public access to a Transparent copy of the Document, and likewise
the network locations given in the Document for previous versions
it was based on. These may be placed in the “History” section.
You may omit a network location for a work that was published at
least four years before the Document itself, or if the original
publisher of the version it refers to gives permission.
</li><li> For any section Entitled “Acknowledgements” or “Dedications”, Preserve
the Title of the section, and preserve in the section all the
substance and tone of each of the contributor acknowledgements and/or
dedications given therein.
</li><li> Preserve all the Invariant Sections of the Document,
unaltered in their text and in their titles. Section numbers
or the equivalent are not considered part of the section titles.
</li><li> Delete any section Entitled “Endorsements”. Such a section
may not be included in the Modified Version.
</li><li> Do not retitle any existing section to be Entitled “Endorsements” or
to conflict in title with any Invariant Section.
</li><li> Preserve any Warranty Disclaimers.
</li></ol>
<p>If the Modified Version includes new front-matter sections or
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of these sections as invariant. To do this, add their titles to the
list of Invariant Sections in the Modified Version’s license notice.
These titles must be distinct from any other section titles.
</p>
<p>You may add a section Entitled “Endorsements”, provided it contains
nothing but endorsements of your Modified Version by various
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been approved by an organization as the authoritative definition of a
standard.
</p>
<p>You may add a passage of up to five words as a Front-Cover Text, and a
passage of up to 25 words as a Back-Cover Text, to the end of the list
of Cover Texts in the Modified Version. Only one passage of
Front-Cover Text and one of Back-Cover Text may be added by (or
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you may not add another; but you may replace the old one, on explicit
permission from the previous publisher that added the old one.
</p>
<p>The author(s) and publisher(s) of the Document do not by this License
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</p>
</li><li> COMBINING DOCUMENTS
<p>You may combine the Document with other documents released under this
License, under the terms defined in section 4 above for modified
versions, provided that you include in the combination all of the
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list them all as Invariant Sections of your combined work in its
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</p>
<p>The combined work need only contain one copy of this License, and
multiple identical Invariant Sections may be replaced with a single
copy. If there are multiple Invariant Sections with the same name but
different contents, make the title of each such section unique by
adding at the end of it, in parentheses, the name of the original
author or publisher of that section if known, or else a unique number.
Make the same adjustment to the section titles in the list of
Invariant Sections in the license notice of the combined work.
</p>
<p>In the combination, you must combine any sections Entitled “History”
in the various original documents, forming one section Entitled
“History”; likewise combine any sections Entitled “Acknowledgements”,
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sections Entitled “Endorsements.”
</p>
</li><li> COLLECTIONS OF DOCUMENTS
<p>You may make a collection consisting of the Document and other documents
released under this License, and replace the individual copies of this
License in the various documents with a single copy that is included in
the collection, provided that you follow the rules of this License for
verbatim copying of each of the documents in all other respects.
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<p>You may extract a single document from such a collection, and distribute
it individually under this License, provided you insert a copy of this
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other respects regarding verbatim copying of that document.
</p>
</li><li> AGGREGATION WITH INDEPENDENT WORKS
<p>A compilation of the Document or its derivatives with other separate
and independent documents or works, in or on a volume of a storage or
distribution medium, is called an “aggregate” if the copyright
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When the Document is included in an aggregate, this License does not
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</p>
<p>If the Cover Text requirement of section 3 is applicable to these
copies of the Document, then if the Document is less than one half of
the entire aggregate, the Document’s Cover Texts may be placed on
covers that bracket the Document within the aggregate, or the
electronic equivalent of covers if the Document is in electronic form.
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</p>
</li><li> TRANSLATION
<p>Translation is considered a kind of modification, so you may
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Replacing Invariant Sections with translations requires special
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Document, and any Warranty Disclaimers, provided that you also include
the original English version of this License and the original versions
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or disclaimer, the original version will prevail.
</p>
<p>If a section in the Document is Entitled “Acknowledgements”,
“Dedications”, or “History”, the requirement (section 4) to Preserve
its Title (section 1) will typically require changing the actual
title.
</p>
</li><li> TERMINATION
<p>You may not copy, modify, sublicense, or distribute the Document
except as expressly provided under this License. Any attempt
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will automatically terminate your rights under this License.
</p>
<p>However, if you cease all violation of this License, then your license
from a particular copyright holder is reinstated (a) provisionally,
unless and until the copyright holder explicitly and finally
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fails to notify you of the violation by some reasonable means prior to
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</p>
<p>Moreover, your license from a particular copyright holder is
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violation by some reasonable means, this is the first time you have
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your receipt of the notice.
</p>
<p>Termination of your rights under this section does not terminate the
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not give you any rights to use it.
</p>
</li><li> FUTURE REVISIONS OF THIS LICENSE
<p>The Free Software Foundation may publish new, revised versions
of the GNU Free Documentation License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns. See
<a href="https://www.gnu.org/licenses/">https://www.gnu.org/licenses/</a>.
</p>
<p>Each version of the License is given a distinguishing version number.
If the Document specifies that a particular numbered version of this
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</p>
</li><li> RELICENSING
<p>“Massive Multiauthor Collaboration Site” (or “MMC Site”) means any
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public wiki that anybody can edit is an example of such a server. A
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site means any set of copyrightable works thus published on the MMC
site.
</p>
<p>“CC-BY-SA” means the Creative Commons Attribution-Share Alike 3.0
license published by Creative Commons Corporation, a not-for-profit
corporation with a principal place of business in San Francisco,
California, as well as future copyleft versions of that license
published by that same organization.
</p>
<p>“Incorporate” means to publish or republish a Document, in whole or
in part, as part of another Document.
</p>
<p>An MMC is “eligible for relicensing” if it is licensed under this
License, and if all works that were first published under this License
somewhere other than this MMC, and subsequently incorporated in whole
or in part into the MMC, (1) had no cover texts or invariant sections,
and (2) were thus incorporated prior to November 1, 2008.
</p>
<p>The operator of an MMC Site may republish an MMC contained in the site
under CC-BY-SA on the same site at any time before August 1, 2009,
provided the MMC is eligible for relicensing.
</p>
</li></ol>
<span id="ADDENDUM_003a-How-to-use-this-License-for-your-documents"></span><h3 class="heading">ADDENDUM: How to use this License for your documents</h3>
<p>To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and
license notices just after the title page:
</p>
<div class="example">
<pre class="example"> Copyright (C) <var>year</var> <var>your name</var>.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. A copy of the license is included in the section entitled ``GNU
Free Documentation License''.
</pre></div>
<p>If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts,
replace the “with…Texts.” line with this:
</p>
<div class="example">
<pre class="example"> with the Invariant Sections being <var>list their titles</var>, with
the Front-Cover Texts being <var>list</var>, and with the Back-Cover Texts
being <var>list</var>.
</pre></div>
<p>If you have Invariant Sections without Cover Texts, or some other
combination of the three, merge those two alternatives to suit the
situation.
</p>
<p>If your document contains nontrivial examples of program code, we
recommend releasing these examples in parallel under your choice of
free software license, such as the GNU General Public License,
to permit their use in free software.
</p>
<hr>
<span id="Procedure-Index"></span><div class="header">
<p>
Next: <a href="#Concept-Index" accesskey="n" rel="next">Concept Index</a>, Previous: <a href="#Copying-Information" accesskey="p" rel="prev">Copying Information</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Procedure-Index-1"></span><h2 class="unnumbered">Procedure Index</h2>
<table><tr><th valign="top">Jump to: </th><td><a class="summary-letter" href="#Procedure-Index_fn_symbol-1"><b>%</b></a>
<br>
<a class="summary-letter" href="#Procedure-Index_fn_letter-A"><b>A</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-B"><b>B</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-C"><b>C</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-D"><b>D</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-E"><b>E</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-G"><b>G</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-H"><b>H</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-I"><b>I</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-K"><b>K</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-M"><b>M</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-O"><b>O</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-P"><b>P</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-R"><b>R</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-S"><b>S</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-X"><b>X</b></a>
</td></tr></table>
<table class="index-fn" border="0">
<tr><td></td><th align="left">Index Entry</th><td> </td><th align="left"> Section</th></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_symbol-1">%</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025import_002dopenpgp_002dcertificate"><code>%import-openpgp-certificate</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025import_002dopenpgp_002dprivate_002dkey"><code>%import-openpgp-private-key</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002dalgorithm"><code>%openpgp-certificate-algorithm</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002dfingerprint"><code>%openpgp-certificate-fingerprint</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002dfingerprint_0021"><code>%openpgp-certificate-fingerprint!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002did"><code>%openpgp-certificate-id</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002did_0021"><code>%openpgp-certificate-id!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002dname"><code>%openpgp-certificate-name</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002dnames"><code>%openpgp-certificate-names</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002dusage"><code>%openpgp-certificate-usage</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dcertificate_002dversion"><code>%openpgp-certificate-version</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025openpgp_002dkeyring_002dcontains_002dkey_002did_003f"><code>%openpgp-keyring-contains-key-id?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-_0025set_002dcertificate_002dcredentials_002dopenpgp_002dkeys_0021"><code>%set-certificate-credentials-openpgp-keys!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-A">A</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-alert_002ddescription_002d_003estring"><code>alert-description->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-alert_002dget"><code>alert-get</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-alert_002dlevel_002d_003estring"><code>alert-level->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-alert_002dsend"><code>alert-send</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-anonymous_002dclient_002dcredentials_003f"><code>anonymous-client-credentials?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-anonymous_002dserver_002dcredentials_003f"><code>anonymous-server-credentials?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-B">B</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-bye"><code>bye</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-C">C</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-certificate_002dcredentials_003f"><code>certificate-credentials?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-certificate_002drequest_002d_003estring"><code>certificate-request->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-certificate_002dstatus_002d_003estring"><code>certificate-status->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-certificate_002dtype_002d_003estring"><code>certificate-type->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-certificate_002dverify_002d_003estring"><code>certificate-verify->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-cipher_002d_003estring"><code>cipher->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-cipher_002dsuite_002d_003estring"><code>cipher-suite->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-close_002drequest_002d_003estring"><code>close-request->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-compression_002dmethod_002d_003estring"><code>compression-method->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-connection_002dend_002d_003estring"><code>connection-end->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-connection_002dflag_002d_003estring"><code>connection-flag->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-credentials_002d_003estring"><code>credentials->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-D">D</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-dh_002dparameters_003f"><code>dh-parameters?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-digest_002d_003estring"><code>digest->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-E">E</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-error_002d_003estring"><code>error->string</code></a>:</td><td> </td><td valign="top"><a href="#Exception-Handling">Exception Handling</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-error_002d_003estring-1"><code>error->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-G">G</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-gnutls_002dversion"><code>gnutls-version</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-H">H</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-handshake"><code>handshake</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-handshake_002ddescription_002d_003estring"><code>handshake-description->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-I">I</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-import_002dopenpgp_002dkeyring"><code>import-openpgp-keyring</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-import_002dx509_002dcertificate"><code>import-x509-certificate</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-import_002dx509_002dprivate_002dkey"><code>import-x509-private-key</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-K">K</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-key_002dusage_002d_003estring"><code>key-usage->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-kx_002d_003estring"><code>kx->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-M">M</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-mac_002d_003estring"><code>mac->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-make_002danonymous_002dclient_002dcredentials"><code>make-anonymous-client-credentials</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-make_002danonymous_002dserver_002dcredentials"><code>make-anonymous-server-credentials</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-make_002dcertificate_002dcredentials"><code>make-certificate-credentials</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-make_002ddh_002dparameters"><code>make-dh-parameters</code></a>:</td><td> </td><td valign="top"><a href="#Representation-of-Binary-Data">Representation of Binary Data</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-make_002ddh_002dparameters-1"><code>make-dh-parameters</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-make_002dpsk_002dclient_002dcredentials"><code>make-psk-client-credentials</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-make_002dpsk_002dserver_002dcredentials"><code>make-psk-server-credentials</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-make_002dsession"><code>make-session</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-O">O</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-openpgp_002dcertificate_002dformat_002d_003estring"><code>openpgp-certificate-format->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-openpgp_002dcertificate_003f"><code>openpgp-certificate?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-openpgp_002dkeyring_003f"><code>openpgp-keyring?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-openpgp_002dprivate_002dkey_003f"><code>openpgp-private-key?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-P">P</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-params_002d_003estring"><code>params->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-peer_002dcertificate_002dstatus"><code>peer-certificate-status</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-pk_002dalgorithm_002d_003estring"><code>pk-algorithm->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-pkcs3_002dexport_002ddh_002dparameters"><code>pkcs3-export-dh-parameters</code></a>:</td><td> </td><td valign="top"><a href="#Representation-of-Binary-Data">Representation of Binary Data</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-pkcs3_002dexport_002ddh_002dparameters-1"><code>pkcs3-export-dh-parameters</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-pkcs3_002dimport_002ddh_002dparameters"><code>pkcs3-import-dh-parameters</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-pkcs8_002dimport_002dx509_002dprivate_002dkey"><code>pkcs8-import-x509-private-key</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-protocol_002d_003estring"><code>protocol->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-psk_002dclient_002dcredentials_003f"><code>psk-client-credentials?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-psk_002dkey_002dformat_002d_003estring"><code>psk-key-format->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-psk_002dserver_002dcredentials_003f"><code>psk-server-credentials?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-R">R</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-reauthenticate"><code>reauthenticate</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-record_002dreceive_0021"><code>record-receive!</code></a>:</td><td> </td><td valign="top"><a href="#Input-and-Output">Input and Output</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-record_002dreceive_0021-1"><code>record-receive!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-record_002dsend"><code>record-send</code></a>:</td><td> </td><td valign="top"><a href="#Input-and-Output">Input and Output</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-record_002dsend-1"><code>record-send</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-rehandshake"><code>rehandshake</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-S">S</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-server_002dname_002dtype_002d_003estring"><code>server-name-type->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-server_002dsession_002dpsk_002dusername"><code>server-session-psk-username</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dauthentication_002dtype"><code>session-authentication-type</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dcertificate_002dtype"><code>session-certificate-type</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dcipher"><code>session-cipher</code></a>:</td><td> </td><td valign="top"><a href="#Enumerates-and-Constants">Enumerates and Constants</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dcipher-1"><code>session-cipher</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dclient_002dauthentication_002dtype"><code>session-client-authentication-type</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dcompression_002dmethod"><code>session-compression-method</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dkx"><code>session-kx</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dmac"><code>session-mac</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dour_002dcertificate_002dchain"><code>session-our-certificate-chain</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dpeer_002dcertificate_002dchain"><code>session-peer-certificate-chain</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dprotocol"><code>session-protocol</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002drecord_002dport"><code>session-record-port</code></a>:</td><td> </td><td valign="top"><a href="#Input-and-Output">Input and Output</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002drecord_002dport-1"><code>session-record-port</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_002dserver_002dauthentication_002dtype"><code>session-server-authentication-type</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-session_003f"><code>session?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002danonymous_002dserver_002ddh_002dparameters_0021"><code>set-anonymous-server-dh-parameters!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002ddh_002dparameters_0021"><code>set-certificate-credentials-dh-parameters!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dverify_002dflags_0021"><code>set-certificate-credentials-verify-flags!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dverify_002dlimits_0021"><code>set-certificate-credentials-verify-limits!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dx509_002dcrl_002ddata_0021"><code>set-certificate-credentials-x509-crl-data!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dx509_002dcrl_002dfile_0021"><code>set-certificate-credentials-x509-crl-file!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dx509_002dkey_002ddata_0021"><code>set-certificate-credentials-x509-key-data!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dx509_002dkey_002dfiles_0021"><code>set-certificate-credentials-x509-key-files!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dx509_002dkeys_0021"><code>set-certificate-credentials-x509-keys!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dx509_002dtrust_002ddata_0021"><code>set-certificate-credentials-x509-trust-data!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dcertificate_002dcredentials_002dx509_002dtrust_002dfile_0021"><code>set-certificate-credentials-x509-trust-file!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dlog_002dlevel_0021"><code>set-log-level!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dlog_002dprocedure_0021"><code>set-log-procedure!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dpsk_002dclient_002dcredentials_0021"><code>set-psk-client-credentials!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dpsk_002dserver_002dcredentials_002dfile_0021"><code>set-psk-server-credentials-file!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dserver_002dsession_002dcertificate_002drequest_0021"><code>set-server-session-certificate-request!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002dcredentials_0021"><code>set-session-credentials!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002ddefault_002dpriority_0021"><code>set-session-default-priority!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002ddh_002dprime_002dbits_0021"><code>set-session-dh-prime-bits!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002dpriorities_0021"><code>set-session-priorities!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002dserver_002dname_0021"><code>set-session-server-name!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002dtransport_002dfd_0021"><code>set-session-transport-fd!</code></a>:</td><td> </td><td valign="top"><a href="#Input-and-Output">Input and Output</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002dtransport_002dfd_0021-1"><code>set-session-transport-fd!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002dtransport_002dport_0021"><code>set-session-transport-port!</code></a>:</td><td> </td><td valign="top"><a href="#Input-and-Output">Input and Output</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-set_002dsession_002dtransport_002dport_0021-1"><code>set-session-transport-port!</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-sign_002dalgorithm_002d_003estring"><code>sign-algorithm->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-srp_002dclient_002dcredentials_003f"><code>srp-client-credentials?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-srp_002dserver_002dcredentials_003f"><code>srp-server-credentials?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Procedure-Index_fn_letter-X">X</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dauthority_002dkey_002did"><code>x509-certificate-authority-key-id</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002ddn"><code>x509-certificate-dn</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002ddn_002doid"><code>x509-certificate-dn-oid</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dformat_002d_003estring"><code>x509-certificate-format->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dissuer_002ddn"><code>x509-certificate-issuer-dn</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dissuer_002ddn_002doid"><code>x509-certificate-issuer-dn-oid</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dkey_002did"><code>x509-certificate-key-id</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dkey_002dusage"><code>x509-certificate-key-usage</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dmatches_002dhostname_003f"><code>x509-certificate-matches-hostname?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dpublic_002dkey_002dalgorithm"><code>x509-certificate-public-key-algorithm</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dsignature_002dalgorithm"><code>x509-certificate-signature-algorithm</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dsubject_002dalternative_002dname"><code>x509-certificate-subject-alternative-name</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dsubject_002dkey_002did"><code>x509-certificate-subject-key-id</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_002dversion"><code>x509-certificate-version</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dcertificate_003f"><code>x509-certificate?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dprivate_002dkey_003f"><code>x509-private-key?</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-x509_002dsubject_002dalternative_002dname_002d_003estring"><code>x509-subject-alternative-name->string</code></a>:</td><td> </td><td valign="top"><a href="#Guile-Reference">Guile Reference</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
</table>
<table><tr><th valign="top">Jump to: </th><td><a class="summary-letter" href="#Procedure-Index_fn_symbol-1"><b>%</b></a>
<br>
<a class="summary-letter" href="#Procedure-Index_fn_letter-A"><b>A</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-B"><b>B</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-C"><b>C</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-D"><b>D</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-E"><b>E</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-G"><b>G</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-H"><b>H</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-I"><b>I</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-K"><b>K</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-M"><b>M</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-O"><b>O</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-P"><b>P</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-R"><b>R</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-S"><b>S</b></a>
<a class="summary-letter" href="#Procedure-Index_fn_letter-X"><b>X</b></a>
</td></tr></table>
<hr>
<span id="Concept-Index"></span><div class="header">
<p>
Previous: <a href="#Procedure-Index" accesskey="p" rel="prev">Procedure Index</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> [<a href="#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="#Procedure-Index" title="Index" rel="index">Index</a>]</p>
</div>
<span id="Concept-Index-1"></span><h2 class="unnumbered">Concept Index</h2>
<table><tr><th valign="top">Jump to: </th><td><a class="summary-letter" href="#Concept-Index_cp_letter-B"><b>B</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-C"><b>C</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-E"><b>E</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-F"><b>F</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-G"><b>G</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-H"><b>H</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-S"><b>S</b></a>
</td></tr></table>
<table class="index-cp" border="0">
<tr><td></td><th align="left">Index Entry</th><td> </td><th align="left"> Section</th></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Concept-Index_cp_letter-B">B</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-buffering">buffering</a>:</td><td> </td><td valign="top"><a href="#Input-and-Output">Input and Output</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-bytevectors">bytevectors</a>:</td><td> </td><td valign="top"><a href="#Representation-of-Binary-Data">Representation of Binary Data</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Concept-Index_cp_letter-C">C</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-constant">constant</a>:</td><td> </td><td valign="top"><a href="#Enumerates-and-Constants">Enumerates and Constants</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Concept-Index_cp_letter-E">E</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-enumerate">enumerate</a>:</td><td> </td><td valign="top"><a href="#Enumerates-and-Constants">Enumerates and Constants</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-errors">errors</a>:</td><td> </td><td valign="top"><a href="#Exception-Handling">Exception Handling</a></td></tr>
<tr><td></td><td valign="top"><a href="#index-exceptions">exceptions</a>:</td><td> </td><td valign="top"><a href="#Exception-Handling">Exception Handling</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Concept-Index_cp_letter-F">F</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-FDL_002c-GNU-Free-Documentation-License">FDL, GNU Free Documentation License</a>:</td><td> </td><td valign="top"><a href="#Copying-Information">Copying Information</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Concept-Index_cp_letter-G">G</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-gnutls_002derror"><code>gnutls-error</code></a>:</td><td> </td><td valign="top"><a href="#Exception-Handling">Exception Handling</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Concept-Index_cp_letter-H">H</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-homogeneous-vector">homogeneous vector</a>:</td><td> </td><td valign="top"><a href="#Representation-of-Binary-Data">Representation of Binary Data</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
<tr><th id="Concept-Index_cp_letter-S">S</th><td></td><td></td></tr>
<tr><td></td><td valign="top"><a href="#index-SRFI_002d4">SRFI-4</a>:</td><td> </td><td valign="top"><a href="#Representation-of-Binary-Data">Representation of Binary Data</a></td></tr>
<tr><td colspan="4"> <hr></td></tr>
</table>
<table><tr><th valign="top">Jump to: </th><td><a class="summary-letter" href="#Concept-Index_cp_letter-B"><b>B</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-C"><b>C</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-E"><b>E</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-F"><b>F</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-G"><b>G</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-H"><b>H</b></a>
<a class="summary-letter" href="#Concept-Index_cp_letter-S"><b>S</b></a>
</td></tr></table>
<div class="footnote">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>
<h5><a id="FOOT1" href="#DOCF1">(1)</a></h3>
<p>Historically, SRFI-4 <code>u8vector</code>s are the closest
thing to bytevectors that Guile 1.8 and earlier supported.</p>
</div>
<hr>
</body>
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