1 /*
2 * Copyright (c) 2010-2012 Balabit
3 * Copyright (c) 2010-2012 Balázs Scheidler
4 * Copyright (c) 2012 Gergely Nagy <algernon@balabit.hu>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * As an additional exemption you are allowed to compile & link against the
21 * OpenSSL libraries as published by the OpenSSL project. See the file
22 * COPYING for details.
23 */
24
25 #include "uuid.h"
26
27 #include <openssl/rand.h>
28 #include <arpa/inet.h>
29
30 void
uuid_gen_random(gchar * buf,gsize buflen)31 uuid_gen_random(gchar *buf, gsize buflen)
32 {
33 union
34 {
35 struct
36 {
37 guint32 time_low;
38 guint16 time_mid;
39 guint16 time_hi_and_version;
40 guint8 clk_seq_hi_res;
41 guint8 clk_seq_low;
42 guint8 node[6];
43 guint16 node_low;
44 guint32 node_hi;
45 };
46 guchar __rnd[16];
47 } uuid;
48
49 RAND_bytes(uuid.__rnd, sizeof(uuid));
50
51 uuid.clk_seq_hi_res = (uuid.clk_seq_hi_res & ~0xC0) | 0x80;
52 uuid.time_hi_and_version = htons((uuid.time_hi_and_version & ~0xF000) | 0x4000);
53
54 g_snprintf(buf, buflen, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
55 uuid.time_low, uuid.time_mid, uuid.time_hi_and_version,
56 uuid.clk_seq_hi_res, uuid.clk_seq_low,
57 uuid.node[0], uuid.node[1], uuid.node[2],
58 uuid.node[3], uuid.node[4], uuid.node[5]);
59
60 }
61