| // 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. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "tink/signature/public_key_sign_wrapper.h" |
| |
| #include "tink/crypto_format.h" |
| #include "tink/primitive_set.h" |
| #include "tink/public_key_sign.h" |
| #include "tink/subtle/subtle_util_boringssl.h" |
| #include "tink/util/statusor.h" |
| #include "proto/tink.pb.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| using google::crypto::tink::OutputPrefixType; |
| |
| namespace { |
| |
| util::Status Validate(PrimitiveSet<PublicKeySign>* public_key_sign_set) { |
| if (public_key_sign_set == nullptr) { |
| return util::Status(util::error::INTERNAL, |
| "public_key_sign_set must be non-NULL"); |
| } |
| if (public_key_sign_set->get_primary() == nullptr) { |
| return util::Status(util::error::INVALID_ARGUMENT, |
| "public_key_sign_set has no primary"); |
| } |
| return util::Status::OK; |
| } |
| |
| class PublicKeySignSetWrapper : public PublicKeySign { |
| public: |
| explicit PublicKeySignSetWrapper( |
| std::unique_ptr<PrimitiveSet<PublicKeySign>> public_key_sign_set) |
| : public_key_sign_set_(std::move(public_key_sign_set)) {} |
| |
| crypto::tink::util::StatusOr<std::string> Sign( |
| absl::string_view data) const override; |
| |
| ~PublicKeySignSetWrapper() override {} |
| |
| private: |
| std::unique_ptr<PrimitiveSet<PublicKeySign>> public_key_sign_set_; |
| }; |
| |
| util::StatusOr<std::string> PublicKeySignSetWrapper::Sign( |
| absl::string_view data) const { |
| // BoringSSL expects a non-null pointer for data, |
| // regardless of whether the size is 0. |
| data = subtle::SubtleUtilBoringSSL::EnsureNonNull(data); |
| |
| auto primary = public_key_sign_set_->get_primary(); |
| std::string local_data; |
| if (primary->get_output_prefix_type() == OutputPrefixType::LEGACY) { |
| local_data = std::string(data); |
| local_data.append(1, CryptoFormat::kLegacyStartByte); |
| data = local_data; |
| } |
| auto sign_result = primary->get_primitive().Sign(data); |
| if (!sign_result.ok()) return sign_result.status(); |
| const std::string& key_id = primary->get_identifier(); |
| return key_id + sign_result.ValueOrDie(); |
| } |
| |
| } // anonymous namespace |
| |
| util::StatusOr<std::unique_ptr<PublicKeySign>> PublicKeySignWrapper::Wrap( |
| std::unique_ptr<PrimitiveSet<PublicKeySign>> primitive_set) const { |
| util::Status status = Validate(primitive_set.get()); |
| if (!status.ok()) return status; |
| std::unique_ptr<PublicKeySign> public_key_sign( |
| new PublicKeySignSetWrapper(std::move(primitive_set))); |
| return std::move(public_key_sign); |
| } |
| |
| } // namespace tink |
| } // namespace crypto |