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83 lines
2.0 KiB
Go
83 lines
2.0 KiB
Go
// Copyright 2018 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 aesgcm
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"errors"
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"io"
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)
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// error returned when the key length is less than the
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// required size of 32 bytes.
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var errInvalidKeyLength = errors.New("aesgcm: invalid key length")
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// Encrypt encrypts the plaintext with the provided key and
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// returns the raw, unencoded bytes.
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func Encrypt(plaintext []byte, key *[32]byte) (ciphertext []byte, err error) {
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block, err := aes.NewCipher(key[:])
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if err != nil {
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return nil, err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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nonce := make([]byte, gcm.NonceSize())
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_, err = io.ReadFull(rand.Reader, nonce)
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if err != nil {
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return nil, err
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}
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return gcm.Seal(nonce, nonce, plaintext, nil), nil
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}
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// Decrypt decrypts the raw, unencoded cihpertext with the provided key.
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func Decrypt(ciphertext []byte, key *[32]byte) (plaintext []byte, err error) {
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block, err := aes.NewCipher(key[:])
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if err != nil {
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return nil, err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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if len(ciphertext) < gcm.NonceSize() {
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return nil, errors.New("malformed ciphertext")
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}
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return gcm.Open(nil,
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ciphertext[:gcm.NonceSize()],
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ciphertext[gcm.NonceSize():],
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nil,
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)
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}
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// Key returns an encryption key.
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func Key(s string) (*[32]byte, error) {
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if len(s) < 32 {
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return nil, errInvalidKeyLength
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}
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var key [32]byte
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copy(key[:], s)
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return &key, nil
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}
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