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<title>GnuTLS 3.4.8: Authentication using PSK</title>
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<a name="Authentication-using-PSK"></a>
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<p>
Next: <a href="psktool-Invocation.html#psktool-Invocation" accesskey="n" rel="next">psktool Invocation</a>, Up: <a href="PSK-authentication.html#PSK-authentication" accesskey="u" rel="up">PSK authentication</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Authentication-using-PSK-1"></a>
<h4 class="subsubsection">4.3.2.1 Authentication using <acronym>PSK</acronym></h4>
<a name="index-PSK-authentication"></a>
<p>Authentication using Pre-shared keys is a method to authenticate using
usernames and binary keys. This protocol avoids making use of public
key infrastructure and expensive calculations, thus it is suitable for
constraint clients.
</p>
<p>The implementation in <acronym>GnuTLS</acronym> is based on [<em>TLSPSK</em>].
The supported <acronym>PSK</acronym> key exchange methods are:
</p>
<dl compact="compact">
<dt><code>PSK:</code></dt>
<dd><p>Authentication using the <acronym>PSK</acronym> protocol.
</p>
</dd>
<dt><code>DHE-PSK:</code></dt>
<dd><p>Authentication using the <acronym>PSK</acronym> protocol and Diffie-Hellman key
exchange. This method offers perfect forward secrecy.
</p>
</dd>
<dt><code>ECDHE-PSK:</code></dt>
<dd><p>Authentication using the <acronym>PSK</acronym> protocol and Elliptic curve Diffie-Hellman key
exchange. This method offers perfect forward secrecy.
</p>
</dd>
<dt><code>RSA-PSK:</code></dt>
<dd><p>Authentication using the <acronym>PSK</acronym> protocol for the client and an RSA certificate
for the server.
</p>
</dd>
</dl>
<p>Helper functions to generate and maintain <acronym>PSK</acronym> keys are also included
in <acronym>GnuTLS</acronym>.
</p>
<dl compact="compact">
<dt><code><var>int</var> <a href="Core-TLS-API.html#gnutls_005fkey_005fgenerate">gnutls_key_generate</a> (gnutls_datum_t * <var>key</var>, unsigned int <var>key_size</var>)</code></dt>
<dt><code><var>int</var> <a href="Core-TLS-API.html#gnutls_005fhex_005fencode">gnutls_hex_encode</a> (const gnutls_datum_t * <var>data</var>, char * <var>result</var>, size_t * <var>result_size</var>)</code></dt>
<dt><code><var>int</var> <a href="Core-TLS-API.html#gnutls_005fhex_005fdecode">gnutls_hex_decode</a> (const gnutls_datum_t * <var>hex_data</var>, void * <var>result</var>, size_t * <var>result_size</var>)</code></dt>
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