-
Notifications
You must be signed in to change notification settings - Fork 5
/
des_cbc.go
96 lines (82 loc) · 2.18 KB
/
des_cbc.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
/*
Copyright 2016 Wenhui Shen <www.webx.top>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package codec
import (
"crypto/cipher"
"crypto/des"
"encoding/base64"
"log"
)
func NewDESCBC() *DESCBC {
return &DESCBC{
desKey: newDESKey(),
}
}
type DESCBC struct {
*desKey
}
// Encode DES CBC加密
func (d *DESCBC) Encode(text, secret string) string {
crypted := d.EncodeBytes([]byte(text), []byte(secret))
return base64.StdEncoding.EncodeToString(crypted)
}
// Decode DES CBC解密
func (d *DESCBC) Decode(cryptedStr, secret string) string {
crypted, err := base64.StdEncoding.DecodeString(cryptedStr)
if err != nil {
log.Println(err)
return ``
}
origData := d.DecodeBytes(crypted, []byte(secret))
return string(origData)
}
func (d *DESCBC) EncodeBytes(text, secret []byte) []byte {
defer func() {
if r := recover(); r != nil {
log.Println(r)
}
}()
key := secret
key = d.GenKey(key)
block, err := des.NewCipher(key)
if err != nil {
log.Println(err)
return nil
}
origData := text
origData = PKCS5Padding(origData, block.BlockSize())
blockMode := cipher.NewCBCEncrypter(block, key)
crypted := make([]byte, len(origData))
blockMode.CryptBlocks(crypted, origData)
return crypted
}
func (d *DESCBC) DecodeBytes(crypted, secret []byte) []byte {
key := secret
key = d.GenKey(key)
block, err := des.NewCipher(key)
if err != nil {
log.Println(err)
return nil
}
blockMode := cipher.NewCBCDecrypter(block, key)
origData := make([]byte, len(crypted))
blockMode.CryptBlocks(origData, crypted)
origData = PKCS5UnPadding(origData)
return origData
}
func (d *DESCBC) GenKey(key []byte) []byte {
if d.desKey == nil {
d.desKey = newDESKey()
}
return d.GetKey(key)
}