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region_crypter.go
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/
region_crypter.go
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// Copyright 2020 TiKV Project Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package encryption
import (
"crypto/aes"
"crypto/cipher"
"reflect"
"github.com/pingcap/errors"
"github.com/pingcap/kvproto/pkg/encryptionpb"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/tikv/pd/pkg/core"
"github.com/tikv/pd/pkg/errs"
"github.com/tikv/pd/pkg/utils/typeutil"
)
// processRegionKeys encrypt or decrypt the start key and end key of the region in-place,
// using the given data key and IV.
func processRegionKeys(region *metapb.Region, key *encryptionpb.DataKey, iv []byte) error {
block, err := aes.NewCipher(key.Key)
if err != nil {
return errors.Wrap(err, "fail to create aes cipher")
}
stream := cipher.NewCTR(block, iv)
stream.XORKeyStream(region.StartKey, region.StartKey)
stream.XORKeyStream(region.EndKey, region.EndKey)
return nil
}
// EncryptRegion encrypt the region start key and end key, using the current key return from the
// key manager. The return is an encypted copy of the region, with Encryption meta updated.
func EncryptRegion(region *metapb.Region, keyManager KeyManager) (*metapb.Region, error) {
if region == nil {
return nil, errs.ErrEncryptionEncryptRegion.GenWithStack("trying to encrypt nil region")
}
if region.EncryptionMeta != nil {
return nil, errs.ErrEncryptionEncryptRegion.GenWithStack(
"region already encrypted, region id = %d", region.Id)
}
if keyManager == nil ||
(reflect.TypeOf(keyManager).Kind() == reflect.Ptr && reflect.ValueOf(keyManager).IsNil()) {
// encryption is not enabled.
return region, nil
}
keyID, key, err := keyManager.GetCurrentKey()
if err != nil {
return nil, err
}
if key == nil {
// encryption is not enabled.
return region, nil
}
err = CheckEncryptionMethodSupported(key.Method)
if err != nil {
return nil, err
}
iv, err := NewIvCTR()
if err != nil {
return nil, err
}
// Deep copy region before altering it.
outRegion := typeutil.DeepClone(region, core.RegionFactory)
// Encrypt and update in-place.
err = processRegionKeys(outRegion, key, iv)
if err != nil {
return nil, err
}
outRegion.EncryptionMeta = &encryptionpb.EncryptionMeta{
KeyId: keyID,
Iv: iv,
}
return outRegion, nil
}
// DecryptRegion decrypt the region start key and end key, if the region object was encrypted.
// After decryption, encryption meta is also cleared.
// Note: Call may need to make deep copy of the object if changing the object is undesired.
func DecryptRegion(region *metapb.Region, keyManager KeyManager) error {
if region == nil {
return errs.ErrEncryptionDecryptRegion.GenWithStack("trying to decrypt nil region")
}
if region.EncryptionMeta == nil {
return nil
}
if keyManager == nil ||
(reflect.TypeOf(keyManager).Kind() == reflect.Ptr && reflect.ValueOf(keyManager).IsNil()) {
return errs.ErrEncryptionDecryptRegion.GenWithStack(
"unable to decrypt region without encryption keys")
}
key, err := keyManager.GetKey(region.EncryptionMeta.KeyId)
if err != nil {
return err
}
err = CheckEncryptionMethodSupported(key.Method)
if err != nil {
return err
}
// Decrypt and update in-place.
err = processRegionKeys(region, key, region.EncryptionMeta.Iv)
if err != nil {
return err
}
region.EncryptionMeta = nil
return nil
}