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
|
package crypto
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"errors"
"io"
)
var ErrCipherTextBlockSize = errors.New("ciphertext block size is too short")
func EncryptAES(data string, key string) (string, error) {
encrypted, err := EncryptBytesAES([]byte(data), key)
if err != nil {
return "", err
}
return base64.RawURLEncoding.EncodeToString(encrypted), nil
}
func EncryptBytesAES(plainText []byte, key string) ([]byte, error) {
block, err := aes.NewCipher([]byte(key))
if err != nil {
return nil, err
}
cipherText := make([]byte, aes.BlockSize+len(plainText))
iv := cipherText[:aes.BlockSize]
if _, err = io.ReadFull(rand.Reader, iv); err != nil {
return nil, err
}
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(cipherText[aes.BlockSize:], plainText)
return cipherText, nil
}
func DecryptAES(data string, key string) (string, error) {
text, err := base64.RawURLEncoding.DecodeString(data)
if err != nil {
return "", err
}
decrypted, err := DecryptBytesAES(text, key)
if err != nil {
return "", err
}
return string(decrypted), nil
}
func DecryptBytesAES(cipherText []byte, key string) ([]byte, error) {
block, err := aes.NewCipher([]byte(key))
if err != nil {
return nil, err
}
if len(cipherText) < aes.BlockSize {
return nil, ErrCipherTextBlockSize
}
iv := cipherText[:aes.BlockSize]
cipherText = cipherText[aes.BlockSize:]
stream := cipher.NewCFBDecrypter(block, iv)
stream.XORKeyStream(cipherText, cipherText)
return cipherText, err
}
|
