| // Copyright 2018 Google Inc. |
| // |
| // 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. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "tink/util/keyset_util.h" |
| |
| #include <cstdint> |
| #include <random> |
| |
| #include "proto/tink.pb.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| namespace { |
| |
| using google::crypto::tink::Keyset; |
| |
| uint32_t NewKeyId() { |
| std::random_device rd; |
| std::minstd_rand0 gen(rd()); |
| std::uniform_int_distribution<uint32_t> dist; |
| return dist(gen); |
| } |
| |
| } // namespace |
| |
| uint32_t GenerateUnusedKeyId(const Keyset& keyset) { |
| while (true) { |
| uint32_t key_id = NewKeyId(); |
| bool already_exists = false; |
| for (auto& key : keyset.key()) { |
| if (key.key_id() == key_id) { |
| already_exists = true; |
| break; |
| } |
| } |
| if (!already_exists) return key_id; |
| } |
| } |
| |
| } // namespace tink |
| } // namespace crypto |