63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
package crypto
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/rand"
|
|
"encoding/base64"
|
|
"fmt"
|
|
"io"
|
|
)
|
|
|
|
func Encrypt(text string, key []byte) (string, error) {
|
|
plaintext := []byte(text)
|
|
|
|
block, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
aesGCM, err := cipher.NewGCM(block)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
nonce := make([]byte, aesGCM.NonceSize())
|
|
if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
ciphertext := aesGCM.Seal(nonce, nonce, plaintext, nil)
|
|
return base64.StdEncoding.EncodeToString(ciphertext), nil
|
|
}
|
|
|
|
func Decrypt(encrypted string, key []byte) (string, error) {
|
|
data, err := base64.StdEncoding.DecodeString(encrypted)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
block, err := aes.NewCipher(key)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
aesGCM, err := cipher.NewGCM(block)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
nonceSize := aesGCM.NonceSize()
|
|
if len(data) < nonceSize {
|
|
return "", fmt.Errorf("ciphertext too short")
|
|
}
|
|
|
|
nonce, ciphertext := data[:nonceSize], data[nonceSize:]
|
|
plaintext, err := aesGCM.Open(nil, nonce, ciphertext, nil)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
return string(plaintext), nil
|
|
}
|