nccli/util/crypto.go

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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
}