1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
/**
* liburtc
* Copyright 2020 Chris Hiszpanski
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/**
* Pseudo-random univerally-unique identifier generator [^RFC4122].
*
* [^RFC4122]: https://tools.ietf.org/html/rfc4122#section-4.4
*/
#include <stdio.h>
#include <stdlib.h>
#include "prng.h"
#include "uuid.h"
/**
* Generate a pseudo-random UUID.
*
* \return Populated UUID.
*/
struct uuid uuid_create() {
struct uuid u;
// fill with randomness
prng(&u, sizeof(u));
// set reserved and version bits
u.clk_seq_hi_and_reserved = (u.clk_seq_hi_and_reserved & 0x3F) | 0x80;
u.time_hi_and_version = (u.time_hi_and_version & 0x0FFF) | 0x4000;
return u;
}
/**
* Generate pseudorandom UUID (as a string)
*
* \param s Destination string memory.
*
*/
void uuid_create_str(char s[UUID_STR_LEN]) {
struct uuid u = uuid_create();
sprintf(s, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
u.time_low,
u.time_mid,
u.time_hi_and_version,
u.clk_seq_hi_and_reserved,
u.clk_seq_low,
u.node[0],
u.node[1],
u.node[2],
u.node[3],
u.node[4],
u.node[5]
);
}
|
