81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
// Copyright 2019 Adrien Waksberg
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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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// https://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 main
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import(
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"crypto/aes"
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"crypto/sha1"
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"crypto/cipher"
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"crypto/rand"
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"encoding/base64"
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"io"
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"golang.org/x/crypto/pbkdf2"
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)
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// Encrypt data with aes256
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func Encrypt(data []byte, passphrase string, salt string) (string, error) {
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key := pbkdf2.Key([]byte(passphrase), []byte(salt), 4096, 32, sha1.New)
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return "", err
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}
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cipher, err := cipher.NewGCM(block)
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if err != nil {
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return "", err
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}
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nonce := make([]byte, cipher.NonceSize())
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_, err = io.ReadFull(rand.Reader, nonce)
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if err != nil {
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return "", err
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}
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dataEncrypted := cipher.Seal(nonce, nonce, data, nil)
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return base64.StdEncoding.EncodeToString(dataEncrypted), nil
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}
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// Decrypt data
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func Decrypt(data string, passphrase string, salt string) ([]byte, error) {
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key := pbkdf2.Key([]byte(passphrase), []byte(salt), 4096, 32, sha1.New)
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rawData, err := base64.StdEncoding.DecodeString(data)
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if err != nil {
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return []byte{}, err
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}
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block, err := aes.NewCipher([]byte(key))
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if err != nil {
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return []byte{}, err
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}
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cipher, err := cipher.NewGCM(block)
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if err != nil {
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return []byte{}, err
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}
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nonceSize := cipher.NonceSize()
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nonce, text := rawData[:nonceSize], rawData[nonceSize:]
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plaintext, err := cipher.Open(nil, nonce, text, nil)
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if err != nil {
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return []byte{}, err
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}
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return plaintext, nil
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}
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