1use std::time::{SystemTime, UNIX_EPOCH};
2
3fn current_time() -> u128 {
4 let now = SystemTime::now();
5 let nanos = now.duration_since(UNIX_EPOCH)
6 .expect("time went backwards")
7 .as_nanos();
8 nanos
9}
10
11fn scramble(mut n: u128) -> u128 {
12 n ^= 0xDEADC0DD;
13 n <<= 0xF;
14 n |= 0xC0DE;
15 n = n.rotate_left(43);
16 n ^= 0xBAFEBEEF;
17 n = n.wrapping_add(0xDFDFDFDFDFDFDFDB);
18 n ^= 0xCFED;
19 n ^= n << 0x33;
20 n |= 0xADEF;
21 n = n.rotate_right(30);
22 n >>= 0xF;
23 n = n.wrapping_mul(0xD32B85533B2D22BE);
24 n ^= 0xBEEFAEA7;
25 n = n.rotate_left(24);
26 n <<= 20;
27 n ^= 0xFDFEDDDD;
28 n <<= 20;
29 n = n.wrapping_mul(0x5F23FF248FD8FF09);
30 n ^= n >> 0x2F;
31 n
32}
33
34pub fn get_uuid(i: u128) -> u128 {
35 let mut random = current_time();
36 for _ in 1..i {
37 random = scramble(random);
38 }
39
40 random
41}