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<title>GnuTLS 3.4.8: X.509 certificate names</title>
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<a name="X_002e509-certificate-names"></a>
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Next: <a href="X_002e509-distinguished-names.html#X_002e509-distinguished-names" accesskey="n" rel="next">X.509 distinguished names</a>, Previous: <a href="Importing-an-X_002e509-certificate.html#Importing-an-X_002e509-certificate" accesskey="p" rel="prev">Importing an X.509 certificate</a>, Up: <a href="X_002e509-certificates.html#X_002e509-certificates" accesskey="u" rel="up">X.509 certificates</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>
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<hr>
<a name="X_002e509-certificate-names-1"></a>
<h4 class="subsubsection">4.1.1.3 X.509 certificate names</h4>
<a name="index-X_002e509-certificate-name"></a>
<p>X.509 certificates allow for multiple names and types of names to be specified.
CA certificates often rely on X.509 distinguished names (see <a href="X_002e509-distinguished-names.html#X_002e509-distinguished-names">X.509 distinguished names</a>)
for unique identification, while end-user and server certificates rely on the
’subject alternative names’. The subject alternative names provide a typed name, e.g.,
a DNS name, or an email address, which identifies the owner of the certificate.
The following functions provide access to that names.
</p>
<dl compact="compact">
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fsubject_005falt_005fname2">gnutls_x509_crt_get_subject_alt_name2</a> (gnutls_x509_crt_t <var>cert</var>, unsigned int <var>seq</var>, void * <var>san</var>, size_t * <var>san_size</var>, unsigned int * <var>san_type</var>, unsigned int * <var>critical</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fset_005fsubject_005falt_005fname">gnutls_x509_crt_set_subject_alt_name</a> (gnutls_x509_crt_t <var>crt</var>, gnutls_x509_subject_alt_name_t <var>type</var>, const void * <var>data</var>, unsigned int <var>data_size</var>, unsigned int <var>flags</var>)</code></dt>
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<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fsubject_005falt_005fnames_005finit">gnutls_subject_alt_names_init</a> (gnutls_subject_alt_names_t * <var>sans</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fsubject_005falt_005fnames_005fget">gnutls_subject_alt_names_get</a> (gnutls_subject_alt_names_t <var>sans</var>, unsigned int <var>seq</var>, unsigned int * <var>san_type</var>, gnutls_datum_t * <var>san</var>, gnutls_datum_t * <var>othername_oid</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fsubject_005falt_005fnames_005fset">gnutls_subject_alt_names_set</a> (gnutls_subject_alt_names_t <var>sans</var>, unsigned int <var>san_type</var>, const gnutls_datum_t * <var>san</var>, const char * <var>othername_oid</var>)</code></dt>
</dl>
<p>Note however, that server certificates often used the Common Name (CN), part of the
certificate DistinguishedName to place a single DNS address. That practice is discouraged
(see [<em>RFC6125</em>]), because only a single address can be specified, and the CN field is
free-form making matching ambiguous.
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