47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
// Copyright 2019 Drone IO, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package encrypt
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"errors"
|
|
)
|
|
|
|
// indicates key size is too small.
|
|
var errKeySize = errors.New("encryption key must be 32 bytes")
|
|
|
|
// Encrypter provides database field encryption and decryption.
|
|
// Encrypted values are currently limited to strings, which is
|
|
// reflected in the interface design.
|
|
type Encrypter interface {
|
|
Encrypt(plaintext string) ([]byte, error)
|
|
Decrypt(ciphertext []byte) (string, error)
|
|
}
|
|
|
|
// New provides a new database field encrypter.
|
|
func New(key string) (Encrypter, error) {
|
|
if key == "" {
|
|
return &none{}, nil
|
|
}
|
|
if len(key) != 32 {
|
|
return nil, errKeySize
|
|
}
|
|
b := []byte(key)
|
|
block, err := aes.NewCipher(b)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &Aesgcm{block: block}, nil
|
|
}
|