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
| package main
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"fmt"
"io"
)
func main() {
text := "Hello, World!"
key := []byte("1234567890123456")
encrypted := encrypt(key, text)
fmt.Println(encrypted)
decrypted := decrypt(key, encrypted)
fmt.Println(decrypted)
}
func encrypt(key []byte, text string) string {
plaintext := []byte(text)
block, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
ciphertext := make([]byte, aes.BlockSize+len(plaintext))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
panic(err)
}
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
return base64.StdEncoding.EncodeToString(ciphertext)
}
func decrypt(key []byte, cryptoText string) string {
ciphertext, _ := base64.StdEncoding.DecodeString(cryptoText)
block, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
if len(ciphertext) < aes.BlockSize {
panic("ciphertext too short")
}
iv := ciphertext[:aes.BlockSize]
ciphertext = ciphertext[aes.BlockSize:]
stream := cipher.NewCFBDecrypter(block, iv)
stream.XORKeyStream(ciphertext, ciphertext)
return fmt.Sprintf("%s", ciphertext)
}
|