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
uuid_str2bin(const char * str,u8 * bin)22 int 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
uuid_bin2str(const u8 * bin,char * str,size_t max_len)57 int 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
is_nil_uuid(const u8 * uuid)72 int 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
uuid_gen_mac_addr(const u8 * mac_addr,u8 * uuid)82 void 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