1/*
2 * Universally Unique IDentifier (UUID)
3 * Copyright (c) 2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15#include "includes.h"
16
17#include "common.h"
18#include "crypto/crypto.h"
19#include "crypto/sha1.h"
20#include "uuid.h"
21
22int uuid_str2bin(const char *str, u8 *bin)
23{
24	const char *pos;
25	u8 *opos;
26
27	pos = str;
28	opos = bin;
29
30	if (hexstr2bin(pos, opos, 4))
31		return -1;
32	pos += 8;
33	opos += 4;
34
35	if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
36		return -1;
37	pos += 4;
38	opos += 2;
39
40	if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
41		return -1;
42	pos += 4;
43	opos += 2;
44
45	if (*pos++ != '-' || hexstr2bin(pos, opos, 2))
46		return -1;
47	pos += 4;
48	opos += 2;
49
50	if (*pos++ != '-' || hexstr2bin(pos, opos, 6))
51		return -1;
52
53	return 0;
54}
55
56
57int uuid_bin2str(const u8 *bin, char *str, size_t max_len)
58{
59	int len;
60	len = os_snprintf(str, max_len, "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
61			  "%02x%02x-%02x%02x%02x%02x%02x%02x",
62			  bin[0], bin[1], bin[2], bin[3],
63			  bin[4], bin[5], bin[6], bin[7],
64			  bin[8], bin[9], bin[10], bin[11],
65			  bin[12], bin[13], bin[14], bin[15]);
66	if (len < 0 || (size_t) len >= max_len)
67		return -1;
68	return 0;
69}
70
71
72int is_nil_uuid(const u8 *uuid)
73{
74	int i;
75	for (i = 0; i < UUID_LEN; i++)
76		if (uuid[i])
77			return 0;
78	return 1;
79}
80
81
82void uuid_gen_mac_addr(const u8 *mac_addr, u8 *uuid)
83{
84	const u8 *addr[2];
85	size_t len[2];
86	u8 hash[SHA1_MAC_LEN];
87	u8 nsid[16] = {
88		0x52, 0x64, 0x80, 0xf8,
89		0xc9, 0x9b,
90		0x4b, 0xe5,
91		0xa6, 0x55,
92		0x58, 0xed, 0x5f, 0x5d, 0x60, 0x84
93	};
94
95	addr[0] = nsid;
96	len[0] = sizeof(nsid);
97	addr[1] = mac_addr;
98	len[1] = 6;
99	sha1_vector(2, addr, len, hash);
100	os_memcpy(uuid, hash, 16);
101
102	/* Version: 5 = named-based version using SHA-1 */
103	uuid[6] = (5 << 4) | (uuid[6] & 0x0f);
104
105	/* Variant specified in RFC 4122 */
106	uuid[8] = 0x80 | (uuid[8] & 0x3f);
107}
108