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\begin{verbatim}
#include <stdio.h>
#include <stdlib.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <time.h>
/* This example will generate a private key and a certificate
* request.
*/
int main()
{
gnutls_x509_crq_t crq;
gnutls_x509_privkey_t key;
unsigned char buffer[10*1024];
int buffer_size = sizeof(buffer);
int ret;
gnutls_global_init();
/* Initialize an empty certificate request, and
* an empty private key.
*/
gnutls_x509_crq_init(&crq);
gnutls_x509_privkey_init(&key);
/* Generate a 1024 bit RSA private key.
*/
gnutls_x509_privkey_generate(key, GNUTLS_PK_RSA, 1024, 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_sign(crq, key);
/* 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;
}
\end{verbatim}
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