46 lines
1020 B
Go
46 lines
1020 B
Go
|
package encryption
|
||
|
|
|
||
|
|
import (
|
||
|
|
"crypto/aes"
|
||
|
|
"crypto/cipher"
|
||
|
|
"crypto/rand"
|
||
|
|
"encoding/base64"
|
||
|
|
"errors"
|
||
|
|
"io"
|
||
|
|
)
|
||
|
|
|
||
|
|
func Encrypt(key, text []byte) ([]byte, error) {
|
||
|
|
block, err := aes.NewCipher(key)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
b := base64.StdEncoding.EncodeToString(text)
|
||
|
|
ciphertext := make([]byte, aes.BlockSize+len(b))
|
||
|
|
iv := ciphertext[:aes.BlockSize]
|
||
|
|
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
cfb := cipher.NewCFBEncrypter(block, iv)
|
||
|
|
cfb.XORKeyStream(ciphertext[aes.BlockSize:], []byte(b))
|
||
|
|
return ciphertext, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func Decrypt(key, text []byte) ([]byte, error) {
|
||
|
|
block, err := aes.NewCipher(key)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
if len(text) < aes.BlockSize {
|
||
|
|
return nil, errors.New("ciphertext too short")
|
||
|
|
}
|
||
|
|
iv := text[:aes.BlockSize]
|
||
|
|
text = text[aes.BlockSize:]
|
||
|
|
cfb := cipher.NewCFBDecrypter(block, iv)
|
||
|
|
cfb.XORKeyStream(text, text)
|
||
|
|
data, err := base64.StdEncoding.DecodeString(string(text))
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
return data, nil
|
||
|
|
}
|