76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
// Copyright 2020 dfuse Platform 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 vault
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import (
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crypto_rand "crypto/rand"
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"encoding/base64"
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"fmt"
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"io"
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"golang.org/x/crypto/nacl/secretbox"
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)
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type PassphraseBoxer struct {
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passphrase string
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}
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func NewPassphraseBoxer(password string) *PassphraseBoxer {
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return &PassphraseBoxer{
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passphrase: password,
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}
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}
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func (b *PassphraseBoxer) WrapType() string {
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return "passphrase"
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}
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func (b *PassphraseBoxer) Seal(in []byte) (string, error) {
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var nonce [nonceLength]byte
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if _, err := io.ReadFull(crypto_rand.Reader, nonce[:]); err != nil {
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return "", err
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}
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salt := make([]byte, saltLength)
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if _, err := crypto_rand.Read(salt); err != nil {
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return "", err
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}
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secretKey := deriveKey(b.passphrase, salt)
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prefix := append(salt, nonce[:]...)
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cipherText := secretbox.Seal(prefix, in, &nonce, &secretKey)
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return base64.RawStdEncoding.EncodeToString(cipherText), nil
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}
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func (b *PassphraseBoxer) Open(in string) ([]byte, error) {
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buf, err := base64.RawStdEncoding.DecodeString(in)
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if err != nil {
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return []byte{}, err
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}
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salt := make([]byte, saltLength)
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copy(salt, buf[:saltLength])
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var nonce [nonceLength]byte
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copy(nonce[:], buf[saltLength:nonceLength+saltLength])
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secretKey := deriveKey(b.passphrase, salt)
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decrypted, ok := secretbox.Open(nil, buf[nonceLength+saltLength:], &nonce, &secretKey)
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if !ok {
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return []byte{}, fmt.Errorf("failed to decrypt")
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}
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return decrypted, nil
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}
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