-
Notifications
You must be signed in to change notification settings - Fork 23
/
cipher_ccmb.go
84 lines (67 loc) · 1.74 KB
/
cipher_ccmb.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
package pkcs8
import (
"errors"
"crypto/cipher"
"encoding/asn1"
cryptobin_cipher "github.com/deatil/go-cryptobin/cipher"
)
// ccm 模式加密参数
type ccmbParams []byte
// ccm 模式加密
type CipherCCMb struct {
cipherFunc func(key []byte) (cipher.Block, error)
keySize int
nonceSize int
identifier asn1.ObjectIdentifier
}
// 值大小
func (this CipherCCMb) KeySize() int {
return this.keySize
}
// oid
func (this CipherCCMb) OID() asn1.ObjectIdentifier {
return this.identifier
}
// 加密
func (this CipherCCMb) Encrypt(key, plaintext []byte) ([]byte, []byte, error) {
block, err := this.cipherFunc(key)
if err != nil {
return nil, nil, err
}
nonce, err := genRandom(this.nonceSize)
if err != nil {
return nil, nil, err
}
aead, err := cryptobin_cipher.NewCCMWithNonceSize(block, this.nonceSize)
if err != nil {
return nil, nil, err
}
// 加密数据
ciphertext := aead.Seal(nil, nonce, plaintext, nil)
// 需要编码的参数
paramSeq := nonce
// 编码参数
paramBytes, err := asn1.Marshal(paramSeq)
if err != nil {
return nil, nil, err
}
return ciphertext, paramBytes, nil
}
// 解密
func (this CipherCCMb) Decrypt(key, param, ciphertext []byte) ([]byte, error) {
block, err := this.cipherFunc(key)
if err != nil {
return nil, err
}
// 解析参数
var nonce ccmbParams
_, err = asn1.Unmarshal(param, &nonce)
if err != nil {
return nil, errors.New("pkcs8: invalid param type")
}
aead, err := cryptobin_cipher.NewCCMWithNonceSize(block, len(nonce))
if err != nil {
return nil, err
}
return aead.Open(nil, nonce, ciphertext, nil)
}