/*
* gnome-keyring
*
* Copyright (C) 2011 Collabora Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Stef Walter <stefw@collabora.co.uk>
*/
#include "config.h"
#include "gcr-fingerprint.h"
#include "gcr-subject-public-key.h"
#include "gcr/gcr-oids.h"
#include "egg/egg-asn1x.h"
#include "egg/egg-asn1-defs.h"
#include <glib.h>
/**
* SECTION:gcr-fingerprint
* @title: Key Fingerprints
* @short_description: Fingerprints for public and private keys
*
* These functions generate key fingerprints for public keys, certificates and
* key data. The fingerprints are created so that they they will be identical
* for a key and its corresponding certificate.
*
* Note that in the case of certificates these are not fingerprints of the
* actual certificate data, but rather of the public key contained in a
* certificate.
*
* These fingerprints are created using the subjectPublicKeyInfo ASN.1 structure.
*/
/**
* gcr_fingerprint_from_subject_public_key_info:
* @key_info: (array length=n_key_info): DER encoded subjectPublicKeyInfo structure
* @n_key_info: length of DER encoded structure
* @checksum_type: the type of fingerprint to create
* @n_fingerprint: the length of fingerprint returned
*
* Create a key fingerprint for a DER encoded subjectPublicKeyInfo.
*
* Returns: (transfer full) (allow-none) (array length=n_fingerprint): the
* fingerprint or %NULL if the input was invalid.
*/
guchar *
gcr_fingerprint_from_subject_public_key_info (const guchar *key_info,
gsize n_key_info,
GChecksumType checksum_type,
gsize *n_fingerprint)
{
GChecksum *check;
guint8 *fingerprint;
g_return_val_if_fail (key_info, NULL);
g_return_val_if_fail (n_key_info, NULL);
g_return_val_if_fail (n_fingerprint, NULL);
check = g_checksum_new (checksum_type);
g_return_val_if_fail (check, NULL);
g_checksum_update (check, key_info, n_key_info);
*n_fingerprint = g_checksum_type_get_length (checksum_type);
fingerprint = g_malloc (*n_fingerprint);
g_checksum_get_digest (check, fingerprint, n_fingerprint);
g_checksum_free (check);
return fingerprint;
}
/**
* gcr_fingerprint_from_attributes:
* @attrs: attributes for key or certificate
* @checksum_type: the type of fingerprint to create
* @n_fingerprint: the length of fingerprint returned
*
* Create a key fingerprint for a certificate, public key or private key.
* Note that this is not a fingerprint of certificate data, which you would
* use gcr_certificate_get_fingerprint() for.
*
* Returns: (transfer full) (allow-none) (array length=n_fingerprint): the
* fingerprint or %NULL if the input was invalid.
*/
guchar *
gcr_fingerprint_from_attributes (GckAttributes *attrs,
GChecksumType checksum_type,
gsize *n_fingerprint)
{
gpointer fingerprint = NULL;
GBytes *info;
GNode *asn;
g_return_val_if_fail (attrs != NULL, NULL);
g_return_val_if_fail (n_fingerprint, NULL);
asn = _gcr_subject_public_key_for_attributes (attrs);
if (asn != NULL) {
info = egg_asn1x_encode (asn, NULL);
fingerprint = gcr_fingerprint_from_subject_public_key_info (g_bytes_get_data (info, NULL),
g_bytes_get_size (info),
checksum_type,
n_fingerprint);
g_bytes_unref (info);
}
egg_asn1x_destroy (asn);
return fingerprint;
}