version3.c
1.78 KB
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/**
* \file
*
* \author Georg Hopp
*
* \copyright
* Copyright © 2013 Georg Hopp
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// for size_t
#include <sys/types.h>
// for md5 generation
#include <openssl/md5.h>
// for htonl and similar
#include <arpa/inet.h>
// for already available uuid functionality
#include "trbase.h"
#include "tr/uuid.h"
void _TR_uuidFormat3or5(TR_Uuid uuid, unsigned char hash[16], int version);
TR_Uuid
TR_uuidVersion3(const unsigned char * name, size_t nname, TR_Uuid nsid)
{
MD5_CTX ctx;
unsigned char hash[16];
TR_Uuid net_nsid = TR_clone(nsid);
TR_Uuid uuid = TR_new(TR_Uuid);
/*
* put the namespace id into network byte order.
*/
(net_nsid->uuid).elements.time_low =
htonl((net_nsid->uuid).elements.time_low);
(net_nsid->uuid).elements.time_mid =
htons((net_nsid->uuid).elements.time_mid);
(net_nsid->uuid).elements.time_hi_version =
htons((net_nsid->uuid).elements.time_hi_version);
/*
* generate the MD5
*/
MD5_Init(&ctx);
MD5_Update(&ctx, (net_nsid->uuid).value, 16);
MD5_Update(&ctx, name, nname);
MD5_Final(hash, &ctx);
TR_delete(net_nsid);
_TR_uuidFormat3or5(uuid, hash, 3);
return uuid;
}
// vim: set ts=4 sw=4: