mirror of
https://github.com/cwinfo/matterbridge.git
synced 2024-12-28 15:55:40 +00:00
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
// Copyright (c) 2022 Tulir Asokan
|
|
//
|
|
// This Source Code Form is subject to the terms of the Mozilla Public
|
|
// License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
|
|
|
|
package gcmutil
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"fmt"
|
|
)
|
|
|
|
func Prepare(secretKey []byte) (gcm cipher.AEAD, err error) {
|
|
var block cipher.Block
|
|
if block, err = aes.NewCipher(secretKey); err != nil {
|
|
err = fmt.Errorf("failed to initialize AES cipher: %w", err)
|
|
} else if gcm, err = cipher.NewGCM(block); err != nil {
|
|
err = fmt.Errorf("failed to initialize GCM: %w", err)
|
|
}
|
|
return
|
|
}
|
|
|
|
func Decrypt(secretKey, iv, ciphertext, additionalData []byte) ([]byte, error) {
|
|
if gcm, err := Prepare(secretKey); err != nil {
|
|
return nil, err
|
|
} else if plaintext, decryptErr := gcm.Open(nil, iv, ciphertext, additionalData); decryptErr != nil {
|
|
return nil, decryptErr
|
|
} else {
|
|
return plaintext, nil
|
|
}
|
|
}
|
|
|
|
func Encrypt(secretKey, iv, plaintext, additionalData []byte) ([]byte, error) {
|
|
if gcm, err := Prepare(secretKey); err != nil {
|
|
return nil, err
|
|
} else {
|
|
return gcm.Seal(nil, iv, plaintext, additionalData), nil
|
|
}
|
|
}
|