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<title>GnuTLS 3.5.3: PKCS 10 certificate requests</title>
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<a name="PKCS-10-certificate-requests"></a>
<div class="header">
<p>
Next: <a href="PKIX-certificate-revocation-lists.html#PKIX-certificate-revocation-lists" accesskey="n" rel="next">PKIX certificate revocation lists</a>, Up: <a href="More-on-certificate-authentication.html#More-on-certificate-authentication" accesskey="u" rel="up">More on certificate 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="PKCS-_002310-certificate-requests"></a>
<h4 class="subsection">4.2.1 <acronym>PKCS</acronym> #10 certificate requests</h4>
<a name="index-certificate-requests"></a>
<a name="index-PKCS-_002310"></a>
<p>A certificate request is a structure, which contain information about
an applicant of a certificate service. It usually contains a private
key, a distinguished name and secondary data such as a challenge
password. <acronym>GnuTLS</acronym> supports the requests defined in
<acronym>PKCS</acronym> #10 [<em>RFC2986</em>]. Other formats of certificate requests
are not currently supported.
</p>
<p>A certificate request can be generated by
associating it with a private key, setting the
subject’s information and finally self signing it.
The last step ensures that the requester is in
possession of the private key.
</p>
<dl compact="compact">
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrq_005fset_005fversion">gnutls_x509_crq_set_version</a> (gnutls_x509_crq_t <var>crq</var>, unsigned int <var>version</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrq_005fset_005fdn">gnutls_x509_crq_set_dn</a> (gnutls_x509_crq_t <var>crq</var>, const char * <var>dn</var>, const char ** <var>err</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrq_005fset_005fdn_005fby_005foid">gnutls_x509_crq_set_dn_by_oid</a> (gnutls_x509_crq_t <var>crq</var>, const char * <var>oid</var>, unsigned int <var>raw_flag</var>, const void * <var>data</var>, unsigned int <var>sizeof_data</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrq_005fset_005fkey_005fusage">gnutls_x509_crq_set_key_usage</a> (gnutls_x509_crq_t <var>crq</var>, unsigned int <var>usage</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrq_005fset_005fkey_005fpurpose_005foid">gnutls_x509_crq_set_key_purpose_oid</a> (gnutls_x509_crq_t <var>crq</var>, const void * <var>oid</var>, unsigned int <var>critical</var>)</code></dt>
<dt><code><var>int</var> <a href="X509-certificate-API.html#gnutls_005fx509_005fcrq_005fset_005fbasic_005fconstraints">gnutls_x509_crq_set_basic_constraints</a> (gnutls_x509_crq_t <var>crq</var>, unsigned int <var>ca</var>, int <var>pathLenConstraint</var>)</code></dt>
</dl>
<p>The <a href="X509-certificate-API.html#gnutls_005fx509_005fcrq_005fset_005fkey">gnutls_x509_crq_set_key</a> and <a href="X509-certificate-API.html#gnutls_005fx509_005fcrq_005fsign2">gnutls_x509_crq_sign2</a>
functions associate the request with a private key and sign it. If a
request is to be signed with a key residing in a PKCS #11 token it is recommended to use
the signing functions shown in <a href="Abstract-key-types.html#Abstract-key-types">Abstract key types</a>.
</p>
<dl>
<dt><a name="index-gnutls_005fx509_005fcrq_005fset_005fkey"></a>Function: <em>int</em> <strong>gnutls_x509_crq_set_key</strong> <em>(gnutls_x509_crq_t <var>crq</var>, gnutls_x509_privkey_t <var>key</var>)</em></dt>
<dd><p><var>crq</var>: should contain a <code>gnutls_x509_crq_t</code> type
</p>
<p><var>key</var>: holds a private key
</p>
<p>This function will set the public parameters from the given private
key to the request.
</p>
<p><strong>Returns:</strong> On success, <code>GNUTLS_E_SUCCESS</code> (0) is returned, otherwise a
negative error value.
</p></dd></dl>
<dl>
<dt><a name="index-gnutls_005fx509_005fcrq_005fsign2"></a>Function: <em>int</em> <strong>gnutls_x509_crq_sign2</strong> <em>(gnutls_x509_crq_t <var>crq</var>, gnutls_x509_privkey_t <var>key</var>, gnutls_digest_algorithm_t <var>dig</var>, unsigned int <var>flags</var>)</em></dt>
<dd><p><var>crq</var>: should contain a <code>gnutls_x509_crq_t</code> type
</p>
<p><var>key</var>: holds a private key
</p>
<p><var>dig</var>: The message digest to use, i.e., <code>GNUTLS_DIG_SHA1</code>
</p>
<p><var>flags</var>: must be 0
</p>
<p>This function will sign the certificate request with a private key.
This must be the same key as the one used in
<code>gnutls_x509_crt_set_key()</code> since a certificate request is self
signed.
</p>
<p>This must be the last step in a certificate request generation
since all the previously set parameters are now signed.
</p>
<p><strong>Returns:</strong> <code>GNUTLS_E_SUCCESS</code> on success, otherwise a negative error code.
<code>GNUTLS_E_ASN1_VALUE_NOT_FOUND</code> is returned if you didn’t set all
information in the certificate request (e.g., the version using
<code>gnutls_x509_crq_set_version()</code> ).
</p></dd></dl>
<p>The following example is about generating a certificate request, and a
private key. A certificate request can be later be processed by a CA
which should return a signed certificate.
</p>
<a name="ex_002dcrq"></a><pre class="verbatim">/* This example code is placed in the public domain. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gnutls/abstract.h>
#include <time.h>
/* This example will generate a private key and a certificate
* request.
*/
int main(void)
{
gnutls_x509_crq_t crq;
gnutls_x509_privkey_t key;
unsigned char buffer[10 * 1024];
size_t buffer_size = sizeof(buffer);
unsigned int bits;
gnutls_global_init();
/* Initialize an empty certificate request, and
* an empty private key.
*/
gnutls_x509_crq_init(&crq);
gnutls_x509_privkey_init(&key);
/* Generate an RSA key of moderate security.
*/
bits =
gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA,
GNUTLS_SEC_PARAM_MEDIUM);
gnutls_x509_privkey_generate(key, GNUTLS_PK_RSA, bits, 0);
/* Add stuff to the distinguished name
*/
gnutls_x509_crq_set_dn_by_oid(crq, GNUTLS_OID_X520_COUNTRY_NAME,
0, "GR", 2);
gnutls_x509_crq_set_dn_by_oid(crq, GNUTLS_OID_X520_COMMON_NAME,
0, "Nikos", strlen("Nikos"));
/* Set the request version.
*/
gnutls_x509_crq_set_version(crq, 1);
/* Set a challenge password.
*/
gnutls_x509_crq_set_challenge_password(crq,
"something to remember here");
/* Associate the request with the private key
*/
gnutls_x509_crq_set_key(crq, key);
/* Self sign the certificate request.
*/
gnutls_x509_crq_sign2(crq, key, GNUTLS_DIG_SHA1, 0);
/* Export the PEM encoded certificate request, and
* display it.
*/
gnutls_x509_crq_export(crq, GNUTLS_X509_FMT_PEM, buffer,
&buffer_size);
printf("Certificate Request: \n%s", buffer);
/* Export the PEM encoded private key, and
* display it.
*/
buffer_size = sizeof(buffer);
gnutls_x509_privkey_export(key, GNUTLS_X509_FMT_PEM, buffer,
&buffer_size);
printf("\n\nPrivate key: \n%s", buffer);
gnutls_x509_crq_deinit(crq);
gnutls_x509_privkey_deinit(key);
return 0;
}
</pre>
<hr>
<div class="header">
<p>
Next: <a href="PKIX-certificate-revocation-lists.html#PKIX-certificate-revocation-lists" accesskey="n" rel="next">PKIX certificate revocation lists</a>, Up: <a href="More-on-certificate-authentication.html#More-on-certificate-authentication" accesskey="u" rel="up">More on certificate 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>
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