-
Notifications
You must be signed in to change notification settings - Fork 0
/
utils.go
51 lines (40 loc) · 899 Bytes
/
utils.go
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
package siphash
import (
"math/bits"
"encoding/binary"
)
// Endianness option
const littleEndian bool = true
func GETU64(ptr []byte) uint64 {
if littleEndian {
return binary.LittleEndian.Uint64(ptr)
} else {
return binary.BigEndian.Uint64(ptr)
}
}
func PUTU64(ptr []byte, a uint64) {
if littleEndian {
binary.LittleEndian.PutUint64(ptr, a)
} else {
binary.BigEndian.PutUint64(ptr, a)
}
}
func sipround(v0, v1, v2, v3 *uint64) {
(*v0) += (*v1)
(*v1) = ROTL((*v1), 13)
(*v1) ^= (*v0)
(*v0) = ROTL((*v0), 32)
(*v2) += (*v3)
(*v3) = ROTL((*v3), 16)
(*v3) ^= (*v2)
(*v0) += (*v3)
(*v3) = ROTL((*v3), 21)
(*v3) ^= (*v0)
(*v2) += (*v1)
(*v1) = ROTL((*v1), 17)
(*v1) ^= (*v2)
(*v2) = ROTL((*v2), 32)
}
func ROTL(x, n uint64) uint64 {
return bits.RotateLeft64(x, int(n))
}