63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
|
package util
|
||
|
|
|
||
|
|
import (
|
||
|
|
"crypto/aes"
|
||
|
|
"crypto/cipher"
|
||
|
|
"crypto/rand"
|
||
|
|
"encoding/base64"
|
||
|
|
"encoding/hex"
|
||
|
|
"errors"
|
||
|
|
"fmt"
|
||
|
|
"io"
|
||
|
|
)
|
||
|
|
|
||
|
|
func getKey() string {
|
||
|
|
key := []byte("4bUMVpSJjvjwEC7qV2AQjvjwEC7qV2AQ")
|
||
|
|
return hex.EncodeToString(key)
|
||
|
|
}
|
||
|
|
func Encrypt(input string) (string, error) {
|
||
|
|
btKey, _ := hex.DecodeString(getKey())
|
||
|
|
plaintext := []byte(input)
|
||
|
|
|
||
|
|
// Create a new Cipher Block from the key
|
||
|
|
block, err := aes.NewCipher(btKey)
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
|
||
|
|
ciphertext := make([]byte, aes.BlockSize+len(plaintext))
|
||
|
|
iv := ciphertext[:aes.BlockSize]
|
||
|
|
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
|
||
|
|
stream := cipher.NewCFBEncrypter(block, iv)
|
||
|
|
stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
|
||
|
|
|
||
|
|
// Convert to base64
|
||
|
|
return base64.URLEncoding.EncodeToString(ciphertext), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func Decrypt(input string) (string, error) {
|
||
|
|
btKey, _ := hex.DecodeString(getKey())
|
||
|
|
ciphertext, _ := base64.URLEncoding.DecodeString(input)
|
||
|
|
|
||
|
|
block, err := aes.NewCipher(btKey)
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
|
||
|
|
if len(ciphertext) < aes.BlockSize {
|
||
|
|
return "", errors.New("ciphertext is too short")
|
||
|
|
}
|
||
|
|
iv := ciphertext[:aes.BlockSize]
|
||
|
|
ciphertext = ciphertext[aes.BlockSize:]
|
||
|
|
|
||
|
|
stream := cipher.NewCFBDecrypter(block, iv)
|
||
|
|
|
||
|
|
// XORKeyStream can work in-place if the two arguments are the same.
|
||
|
|
stream.XORKeyStream(ciphertext, ciphertext)
|
||
|
|
|
||
|
|
return fmt.Sprintf("%s", ciphertext), nil
|
||
|
|
}
|