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balajiandGitHub
f7920a6bdd
This PR will add support for encrypting data which going to be on disk. Two components are being encrypted, one is sst and another one is vlog. In sst, each block is encrypted with seperate IV using AES CTR mode. In vlog, each entry is being encrypted. Each vlog will have base IV of 12 bytes. IV for the each entry is generated by merging base IV with entry offset. Data are encrypted using datakey, which is generated by the badger. The datakey is further encrypted using user provided key and stored in disk. So that user can change key. In order to change key user has to provide old key and new key. we'll decrypt using old key and store the datakey back to disk by encrypting using the new key. By this mechanism, it'll simplfy the key change.
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
/*
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* Copyright 2019 Dgraph Labs, Inc. and Contributors
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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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*/
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package y
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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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)
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// XORBlock encrypts the given data with AES and XOR's with IV.
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// Can be used for both encryption and decryption. IV is of
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// AES block size.
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func XORBlock(src, key, iv []byte) ([]byte, 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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stream := cipher.NewCTR(block, iv)
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dst := make([]byte, len(src))
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stream.XORKeyStream(dst, src)
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return dst, nil
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}
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// GenerateIV generates IV.
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func GenerateIV() ([]byte, error) {
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iv := make([]byte, aes.BlockSize)
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_, err := rand.Read(iv)
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return iv, err
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}
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