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<a name="PKCS12-structure-generation-example"></a>
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<p>
Previous: <a href="Listing-the-ciphersuites-in-a-priority-string.html#Listing-the-ciphersuites-in-a-priority-string" accesskey="p" rel="prev">Listing the ciphersuites in a priority string</a>, Up: <a href="Miscellaneous-examples.html#Miscellaneous-examples" accesskey="u" rel="up">Miscellaneous examples</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-_002312-structure-generation-example"></a>
<h4 class="subsection">7.4.4 PKCS #12 structure generation example</h4>
<p>This small program demonstrates the usage of the PKCS #12 API, by generating
such a structure.
</p>
<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 <gnutls/gnutls.h>
#include <gnutls/pkcs12.h>
#include "examples.h"
#define OUTFILE "out.p12"
/* This function will write a pkcs12 structure into a file.
* cert: is a DER encoded certificate
* pkcs8_key: is a PKCS #8 encrypted key (note that this must be
* encrypted using a PKCS #12 cipher, or some browsers will crash)
* password: is the password used to encrypt the PKCS #12 packet.
*/
int
write_pkcs12(const gnutls_datum_t * cert,
const gnutls_datum_t * pkcs8_key, const char *password)
{
gnutls_pkcs12_t pkcs12;
int ret, bag_index;
gnutls_pkcs12_bag_t bag, key_bag;
char pkcs12_struct[10 * 1024];
size_t pkcs12_struct_size;
FILE *fd;
/* A good idea might be to use gnutls_x509_privkey_get_key_id()
* to obtain a unique ID.
*/
gnutls_datum_t key_id = { (void *) "\x00\x00\x07", 3 };
gnutls_global_init();
/* Firstly we create two helper bags, which hold the certificate,
* and the (encrypted) key.
*/
gnutls_pkcs12_bag_init(&bag);
gnutls_pkcs12_bag_init(&key_bag);
ret =
gnutls_pkcs12_bag_set_data(bag, GNUTLS_BAG_CERTIFICATE, cert);
if (ret < 0) {
fprintf(stderr, "ret: %s\n", gnutls_strerror(ret));
return 1;
}
/* ret now holds the bag's index.
*/
bag_index = ret;
/* Associate a friendly name with the given certificate. Used
* by browsers.
*/
gnutls_pkcs12_bag_set_friendly_name(bag, bag_index, "My name");
/* Associate the certificate with the key using a unique key
* ID.
*/
gnutls_pkcs12_bag_set_key_id(bag, bag_index, &key_id);
/* use weak encryption for the certificate.
*/
gnutls_pkcs12_bag_encrypt(bag, password,
GNUTLS_PKCS_USE_PKCS12_RC2_40);
/* Now the key.
*/
ret = gnutls_pkcs12_bag_set_data(key_bag,
GNUTLS_BAG_PKCS8_ENCRYPTED_KEY,
pkcs8_key);
if (ret < 0) {
fprintf(stderr, "ret: %s\n", gnutls_strerror(ret));
return 1;
}
/* Note that since the PKCS #8 key is already encrypted we don't
* bother encrypting that bag.
*/
bag_index = ret;
gnutls_pkcs12_bag_set_friendly_name(key_bag, bag_index, "My name");
gnutls_pkcs12_bag_set_key_id(key_bag, bag_index, &key_id);
/* The bags were filled. Now create the PKCS #12 structure.
*/
gnutls_pkcs12_init(&pkcs12);
/* Insert the two bags in the PKCS #12 structure.
*/
gnutls_pkcs12_set_bag(pkcs12, bag);
gnutls_pkcs12_set_bag(pkcs12, key_bag);
/* Generate a message authentication code for the PKCS #12
* structure.
*/
gnutls_pkcs12_generate_mac(pkcs12, password);
pkcs12_struct_size = sizeof(pkcs12_struct);
ret =
gnutls_pkcs12_export(pkcs12, GNUTLS_X509_FMT_DER,
pkcs12_struct, &pkcs12_struct_size);
if (ret < 0) {
fprintf(stderr, "ret: %s\n", gnutls_strerror(ret));
return 1;
}
fd = fopen(OUTFILE, "w");
if (fd == NULL) {
fprintf(stderr, "cannot open file\n");
return 1;
}
fwrite(pkcs12_struct, 1, pkcs12_struct_size, fd);
fclose(fd);
gnutls_pkcs12_bag_deinit(bag);
gnutls_pkcs12_bag_deinit(key_bag);
gnutls_pkcs12_deinit(pkcs12);
return 0;
}
</pre>
<hr>
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Previous: <a href="Listing-the-ciphersuites-in-a-priority-string.html#Listing-the-ciphersuites-in-a-priority-string" accesskey="p" rel="prev">Listing the ciphersuites in a priority string</a>, Up: <a href="Miscellaneous-examples.html#Miscellaneous-examples" accesskey="u" rel="up">Miscellaneous examples</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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