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aes.go
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aes.go
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// Copyright 2020 The PipeCD Authors.
//
// 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 crypto
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"encoding/base64"
"fmt"
"os"
)
type AESEncryptDecrypter struct {
key []byte
}
const aesKeySize = 32
// NewAESEncryptDecrypter reads the specified key file and returns an AES EncryptDecrypter.
func NewAESEncryptDecrypter(keyFile string) (*AESEncryptDecrypter, error) {
key, err := os.ReadFile(keyFile)
if err != nil {
return nil, fmt.Errorf("unable to read key file: %v", err)
}
if len(key) < aesKeySize {
return nil, fmt.Errorf("key size (%d) must be greater than or equal to %d", len(key), aesKeySize)
}
return &AESEncryptDecrypter{
key: key[:aesKeySize],
}, nil
}
func (a *AESEncryptDecrypter) Encrypt(text string) (string, error) {
block, err := aes.NewCipher(a.key)
if err != nil {
return "", err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return "", err
}
nonce := make([]byte, gcm.NonceSize())
_, err = rand.Read(nonce)
if err != nil {
return "", err
}
encrypted := gcm.Seal(nil, nonce, []byte(text), nil)
encrypted = append(nonce, encrypted...)
return base64.StdEncoding.EncodeToString(encrypted), nil
}
func (a *AESEncryptDecrypter) Decrypt(encryptedText string) (string, error) {
encrypted, err := base64.StdEncoding.DecodeString(encryptedText)
if err != nil {
return "", err
}
block, err := aes.NewCipher(a.key)
if err != nil {
return "", err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return "", err
}
nonce := encrypted[:gcm.NonceSize()]
text, err := gcm.Open(nil, nonce, encrypted[gcm.NonceSize():], nil)
if err != nil {
return "", err
}
return string(text), nil
}