| // Copyright 2017 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. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #ifndef TINK_CRYPTO_FORMAT_H_ |
| #define TINK_CRYPTO_FORMAT_H_ |
| |
| #include <cstdint> |
| #include <string> |
| #include <vector> |
| |
| #include "absl/strings/string_view.h" |
| #include "tink/util/statusor.h" |
| #include "proto/tink.pb.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| // Constants and convenience methods that deal with the format |
| // of the outputs handled by Tink. |
| class CryptoFormat { |
| public: |
| // Prefix size of Tink and Legacy key types. |
| static constexpr int kNonRawPrefixSize = 5; |
| |
| // Legacy prefix starts with \x00 and followed by a 4-byte key id. |
| static constexpr int kLegacyPrefixSize = kNonRawPrefixSize; |
| static constexpr uint8_t kLegacyStartByte = 0x00; |
| |
| // Tink prefix starts with \x01 and followed by a 4-byte key id. |
| static constexpr int kTinkPrefixSize = kNonRawPrefixSize; |
| static constexpr uint8_t kTinkStartByte = 0x01; |
| |
| // Raw prefix is empty. |
| static constexpr int kRawPrefixSize = 0; |
| static const absl::string_view kRawPrefix; // empty string |
| |
| // Generates the prefix for the outputs handled with the given key_info. |
| // Returns an error if the prefix type 'output_prefix_type' is invalid. |
| static crypto::tink::util::StatusOr<std::string> GetOutputPrefix( |
| const google::crypto::tink::KeysetInfo::KeyInfo& key_info); |
| }; |
| |
| } // namespace tink |
| } // namespace crypto |
| |
| #endif // TINK_CRYPTO_FORMAT_H_ |