channeldb: remove EncryptorDecryptor interface

This commit removes the EncryptorDecryptor interface, and all related
usage within channeldb. This interface is no longer needed as wallet
specific secrets such as private keys are no longer stored within the
database.

channeldb/db.go

@@ -27,14 +27,6 @@ var bufPool = &sync.Pool{
 	New: func() interface{} { return new(bytes.Buffer) },
 }
 
-// EncryptorDecryptor...
-// TODO(roasbeef): ability to rotate EncryptorDecryptor's across DB
-type EncryptorDecryptor interface {
-	Encrypt(in []byte) ([]byte, error)
-	Decrypt(in []byte) ([]byte, error)
-	OverheadSize() uint32
-}
-
 // DB is the primary datastore for the LND daemon. The database stores
 // information related to nodes, routing data, open/closed channels, fee
 // schedules, and reputation data.
@@ -42,8 +34,6 @@ type DB struct {
 	store *bolt.DB
 
 	netParams *chaincfg.Params
-
-	cryptoSystem EncryptorDecryptor
 }
 
 // Open opens an existing channeldb created under the passed namespace with
@@ -66,12 +56,6 @@ func Open(dbPath string, netParams *chaincfg.Params) (*DB, error) {
 	return &DB{store: bdb, netParams: netParams}, nil
 }
 
-// RegisterCryptoSystem registers an implementation of the EncryptorDecryptor
-// interface for use within the database to encrypt/decrypt sensitive data.
-func (d *DB) RegisterCryptoSystem(ed EncryptorDecryptor) {
-	d.cryptoSystem = ed
-}
-
 // Wipe completely deletes all saved state within all used buckets within the
 // database. The deletion is done in a single transaction, therefore this
 // operation is fully atomic.
@@ -179,7 +163,7 @@ func (d *DB) FetchOpenChannels(nodeID *wire.ShaHash) ([]*OpenChannel, error) {
 			}
 
 			oChannel, err := fetchOpenChannel(openChanBucket,
-				nodeChanBucket, chanID, d.cryptoSystem)
+				nodeChanBucket, chanID)
 			if err != nil {
 				return err
 			}