-
Notifications
You must be signed in to change notification settings - Fork 22
/
mars.go
107 lines (77 loc) · 2.22 KB
/
mars.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
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
package mars
import (
"strconv"
"crypto/cipher"
"encoding/binary"
"github.com/deatil/go-cryptobin/tool/alias"
)
const BlockSize = 16
type KeySizeError int
func (k KeySizeError) Error() string {
return "cryptobin/mars: invalid key size " + strconv.Itoa(int(k))
}
type marsCipher struct {
key [40]uint32
}
// NewCipher creates and returns a new cipher.Block.
func NewCipher(key []byte) (cipher.Block, error) {
k := len(key)
switch k {
case 16, 24, 32:
break
default:
return nil, KeySizeError(len(key))
}
var in_key []uint32
var one uint32
keyints := bytesToUint32s(key[:16])
in_key = append(in_key, keyints[:]...)
if k > 16 {
one = binary.BigEndian.Uint32(key[16:])
in_key = append(in_key, one)
one = binary.BigEndian.Uint32(key[20:])
in_key = append(in_key, one)
}
if k > 24 {
one = binary.BigEndian.Uint32(key[24:])
in_key = append(in_key, one)
one = binary.BigEndian.Uint32(key[28:])
in_key = append(in_key, one)
}
c := new(marsCipher)
c.key = set_key(in_key, uint32(k*8))
return c, nil
}
func (this *marsCipher) BlockSize() int {
return BlockSize
}
func (this *marsCipher) Encrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/mars: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/mars: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/mars: invalid buffer overlap")
}
in_blk := bytesToUint32s(src)
encBlock := encrypt(in_blk, this.key)
encBytes := Uint32sToBytes(encBlock)
copy(dst, encBytes[:])
}
func (this *marsCipher) Decrypt(dst, src []byte) {
if len(src) < BlockSize {
panic("cryptobin/mars: input not full block")
}
if len(dst) < BlockSize {
panic("cryptobin/mars: output not full block")
}
if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
panic("cryptobin/mars: invalid buffer overlap")
}
in_blk := bytesToUint32s(src)
decBlock := decrypt(in_blk, this.key);
decBytes := Uint32sToBytes(decBlock)
copy(dst, decBytes[:])
}