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 util
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"errors"
"io"
"github.com/seaweedfs/seaweedfs/weed/util/log"
)
type CipherKey []byte
func GenCipherKey() CipherKey {
key := make([]byte, 32)
if _, err := io.ReadFull(rand.Reader, key); err != nil {
log.Fatalf("random key gen: %v", err)
}
return CipherKey(key)
}
func Encrypt(plaintext []byte, key CipherKey) ([]byte, error) {
c, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return nil, err
}
nonce := make([]byte, gcm.NonceSize())
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
return nil, err
}
return gcm.Seal(nonce, nonce, plaintext, nil), nil
}
func Decrypt(ciphertext []byte, key CipherKey) ([]byte, error) {
c, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(c)
if err != nil {
return nil, err
}
nonceSize := gcm.NonceSize()
if len(ciphertext) < nonceSize {
return nil, errors.New("ciphertext too short")
}
nonce, ciphertext := ciphertext[:nonceSize], ciphertext[nonceSize:]
return gcm.Open(nil, nonce, ciphertext, nil)
}
|
