-
Notifications
You must be signed in to change notification settings - Fork 21
/
utils.go
56 lines (43 loc) · 1.06 KB
/
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
52
53
54
55
56
package speck
import (
"math/bits"
"encoding/binary"
)
// Endianness option
const littleEndian bool = true
func keyToUint64s(b []byte) []uint64 {
size := len(b) / 8
dst := make([]uint64, size)
for i := 0; i < size; i++ {
j := i * 8
if littleEndian {
dst[i] = binary.LittleEndian.Uint64(b[j:])
} else {
dst[i] = binary.BigEndian.Uint64(b[j:])
}
}
return dst
}
func uint64sToBytes(w []uint64) []byte {
size := len(w) * 8
dst := make([]byte, size)
for i := 0; i < len(w); i++ {
j := i * 8
if littleEndian {
binary.LittleEndian.PutUint64(dst[j:], w[i])
} else {
binary.BigEndian.PutUint64(dst[j:], w[i])
}
}
return dst
}
func rotatel64(x uint64, n int) uint64 {
return bits.RotateLeft64(x, n)
}
func rotater64(x uint64, n int) uint64 {
return rotatel64(x, 64 - n)
}
func ks(x uint64, y *uint64, pk uint64, nk *uint64, i uint64) {
(*y) = (pk + rotater64(x, 8)) ^ i
(*nk) = rotatel64(pk, 3) ^ (*y)
}