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