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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Common sync protocol for encrypted data.
// If you change or add any fields in this file, update proto_visitors.h and
// potentially proto_enum_conversions.{h, cc}.
syntax = "proto2";
option java_multiple_files = true;
option java_package = "org.chromium.components.sync.protocol";
option optimize_for = LITE_RUNTIME;
package sync_pb;
// Encrypted sync data consists of two parts: a key name and a blob. Key name is
// the name of the key that was used to encrypt blob and blob is encrypted data
// itself.
//
// The reason we need to keep track of the key name is that a sync user can
// change their passphrase (and thus their encryption key) at any time. When
// that happens, we make a best effort to reencrypt all nodes with the new
// passphrase, but since we don't have transactions on the server-side, we
// cannot guarantee that every node will be reencrypted. As a workaround, we
// keep track of all keys, assign each key a name (by using that key to encrypt
// a well known string) and keep track of which key was used to encrypt each
// node.
message EncryptedData {
optional string key_name = 1;
optional string blob = 2; // base64-encoded.
}
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