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<a name="X_002e509-distinguished-names"></a>
<div class="header">
<p>
Next: <a href="X_002e509-extensions.html#X_002e509-extensions" accesskey="n" rel="next">X.509 extensions</a>, Previous: <a href="X_002e509-certificate-names.html#X_002e509-certificate-names" accesskey="p" rel="prev">X.509 certificate names</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>
</div>
<hr>
<a name="X_002e509-distinguished-names-1"></a>
<h4 class="subsubsection">4.1.1.4 X.509 distinguished names</h4>
<a name="index-X_002e509-distinguished-name"></a>
<p>The “subject” of an X.509 certificate is not described by
a single name, but rather with a distinguished name. This in
X.509 terminology is a list of strings each associated an object
identifier. To make things simple GnuTLS provides <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fdn2">gnutls_x509_crt_get_dn2</a>
which follows the rules in [<em>RFC4514</em>] and returns a single
string. Access to each string by individual object identifiers
can be accessed using <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fdn_005fby_005foid">gnutls_x509_crt_get_dn_by_oid</a>.
</p>
<dl>
<dt><a name="index-gnutls_005fx509_005fcrt_005fget_005fdn2"></a>Function: <em>int</em> <strong>gnutls_x509_crt_get_dn2</strong> <em>(gnutls_x509_crt_t <var>cert</var>, gnutls_datum_t * <var>dn</var>)</em></dt>
<dd><p><var>cert</var>: should contain a <code>gnutls_x509_crt_t</code> type
</p>
<p><var>dn</var>: a pointer to a structure to hold the name
</p>
<p>This function will allocate buffer and copy the name of the Certificate.
The name will be in the form "C=xxxx,O=yyyy,CN=zzzz" as
described in RFC4514. The output string will be ASCII or UTF-8
encoded, depending on the certificate data.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p>
<p><strong>Since:</strong> 3.1.10
</p></dd></dl>
<dl compact="compact">
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fdn">gnutls_x509_crt_get_dn</a> (gnutls_x509_crt_t <var>cert</var>, char * <var>buf</var>, size_t * <var>buf_size</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fdn_005fby_005foid">gnutls_x509_crt_get_dn_by_oid</a> (gnutls_x509_crt_t <var>cert</var>, const char * <var>oid</var>, unsigned <var>indx</var>, unsigned int <var>raw_flag</var>, void * <var>buf</var>, size_t * <var>buf_size</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fdn_005foid">gnutls_x509_crt_get_dn_oid</a> (gnutls_x509_crt_t <var>cert</var>, unsigned <var>indx</var>, void * <var>oid</var>, size_t * <var>oid_size</var>)</code></dt>
</dl>
<p>Similar functions exist to access the distinguished name
of the issuer of the certificate.
</p>
<dl compact="compact">
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fissuer_005fdn">gnutls_x509_crt_get_issuer_dn</a> (gnutls_x509_crt_t <var>cert</var>, char * <var>buf</var>, size_t * <var>buf_size</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fissuer_005fdn2">gnutls_x509_crt_get_issuer_dn2</a> (gnutls_x509_crt_t <var>cert</var>, gnutls_datum_t * <var>dn</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fissuer_005fdn_005fby_005foid">gnutls_x509_crt_get_issuer_dn_by_oid</a> (gnutls_x509_crt_t <var>cert</var>, const char * <var>oid</var>, unsigned <var>indx</var>, unsigned int <var>raw_flag</var>, void * <var>buf</var>, size_t * <var>buf_size</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fissuer_005fdn_005foid">gnutls_x509_crt_get_issuer_dn_oid</a> (gnutls_x509_crt_t <var>cert</var>, unsigned <var>indx</var>, void * <var>oid</var>, size_t * <var>oid_size</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fissuer">gnutls_x509_crt_get_issuer</a> (gnutls_x509_crt_t <var>cert</var>, gnutls_x509_dn_t * <var>dn</var>)</code></dt>
</dl>
<p>The more powerful <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fsubject">gnutls_x509_crt_get_subject</a> and
<a href="X509-certificate-API.html#gnutls_005fx509_005fdn_005fget_005frdn_005fava">gnutls_x509_dn_get_rdn_ava</a> provide efficient but low-level access
to the contents of the distinguished name structure.
</p>
<dl compact="compact">
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fsubject">gnutls_x509_crt_get_subject</a> (gnutls_x509_crt_t <var>cert</var>, gnutls_x509_dn_t * <var>dn</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrt_005fget_005fissuer">gnutls_x509_crt_get_issuer</a> (gnutls_x509_crt_t <var>cert</var>, gnutls_x509_dn_t * <var>dn</var>)</code></dt>
</dl>
<dl>
<dt><a name="index-gnutls_005fx509_005fdn_005fget_005frdn_005fava"></a>Function: <em>int</em> <strong>gnutls_x509_dn_get_rdn_ava</strong> <em>(gnutls_x509_dn_t <var>dn</var>, int <var>irdn</var>, int <var>iava</var>, gnutls_x509_ava_st * <var>ava</var>)</em></dt>
<dd><p><var>dn</var>: a pointer to DN
</p>
<p><var>irdn</var>: index of RDN
</p>
<p><var>iava</var>: index of AVA.
</p>
<p><var>ava</var>: Pointer to structure which will hold output information.
</p>
<p>Get pointers to data within the DN. The format of the <code>ava</code> structure
is shown below.
</p>
<p>struct gnutls_x509_ava_st {
gnutls_datum_t oid;
gnutls_datum_t value;
unsigned long value_tag;
};
</p>
<p>The X.509 distinguished name is a sequence of sequences of strings
and this is what the <code>irdn</code> and <code>iava</code> indexes model.
</p>
<p>Note that <code>ava</code> will contain pointers into the <code>dn</code> structure which
in turns points to the original certificate. Thus you should not
modify any data or deallocate any of those.
</p>
<p>This is a low-level function that requires the caller to do the
value conversions when necessary (e.g. from UCS-2).
</p>
<p><strong>Returns:</strong> Returns 0 on success, or an error code.
</p></dd></dl>
<hr>
<div class="header">
<p>
Next: <a href="X_002e509-extensions.html#X_002e509-extensions" accesskey="n" rel="next">X.509 extensions</a>, Previous: <a href="X_002e509-certificate-names.html#X_002e509-certificate-names" accesskey="p" rel="prev">X.509 certificate names</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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