-
Notifications
You must be signed in to change notification settings - Fork 22
/
utils.go
60 lines (53 loc) · 1.53 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
57
58
59
60
package camellia
import (
"math/bits"
)
func rotl128(k [2]uint64, rot uint) (hi, lo uint64) {
if rot > 64 {
rot -= 64
k[0], k[1] = k[1], k[0]
}
t := k[0] >> (64 - rot)
hi = (k[0] << rot) | (k[1] >> (64 - rot))
lo = (k[1] << rot) | t
return hi, lo
}
func f(fin, ke uint64) uint64 {
var x uint64
x = fin ^ ke
t1 := sbox1[uint8(x>>56)]
t2 := sbox2[uint8(x>>48)]
t3 := sbox3[uint8(x>>40)]
t4 := sbox4[uint8(x>>32)]
t5 := sbox2[uint8(x>>24)]
t6 := sbox3[uint8(x>>16)]
t7 := sbox4[uint8(x>>8)]
t8 := sbox1[uint8(x)]
y1 := t1 ^ t3 ^ t4 ^ t6 ^ t7 ^ t8
y2 := t1 ^ t2 ^ t4 ^ t5 ^ t7 ^ t8
y3 := t1 ^ t2 ^ t3 ^ t5 ^ t6 ^ t8
y4 := t2 ^ t3 ^ t4 ^ t5 ^ t6 ^ t7
y5 := t1 ^ t2 ^ t6 ^ t7 ^ t8
y6 := t2 ^ t3 ^ t5 ^ t7 ^ t8
y7 := t3 ^ t4 ^ t5 ^ t6 ^ t8
y8 := t1 ^ t4 ^ t5 ^ t6 ^ t7
return uint64(y1)<<56 | uint64(y2)<<48 | uint64(y3)<<40 | uint64(y4)<<32 | uint64(y5)<<24 | uint64(y6)<<16 | uint64(y7)<<8 | uint64(y8)
}
func fl(flin, ke uint64) uint64 {
x1 := uint32(flin >> 32)
x2 := uint32(flin & 0xffffffff)
k1 := uint32(ke >> 32)
k2 := uint32(ke & 0xffffffff)
x2 = x2 ^ bits.RotateLeft32(x1&k1, 1)
x1 = x1 ^ (x2 | k2)
return uint64(x1)<<32 | uint64(x2)
}
func flinv(flin, ke uint64) uint64 {
y1 := uint32(flin >> 32)
y2 := uint32(flin & 0xffffffff)
k1 := uint32(ke >> 32)
k2 := uint32(ke & 0xffffffff)
y1 = y1 ^ (y2 | k2)
y2 = y2 ^ bits.RotateLeft32(y1&k1, 1)
return uint64(y1)<<32 | uint64(y2)
}