| // Copyright 2021 Google LLC |
| // |
| // 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/experimental/pqcrypto/signature/subtle/sphincs_sign.h" |
| |
| #include <string> |
| #include <utility> |
| |
| #include "absl/memory/memory.h" |
| #include "absl/status/status.h" |
| #include "absl/strings/str_format.h" |
| #include "tink/experimental/pqcrypto/signature/subtle/sphincs_helper_pqclean.h" |
| #include "tink/experimental/pqcrypto/signature/subtle/sphincs_subtle_utils.h" |
| #include "tink/util/secret_data.h" |
| #include "tink/util/statusor.h" |
| |
| namespace crypto { |
| namespace tink { |
| namespace subtle { |
| |
| // static |
| util::StatusOr<std::unique_ptr<PublicKeySign>> SphincsSign::New( |
| SphincsPrivateKeyPqclean key) { |
| auto status = internal::CheckFipsCompatibility<SphincsSign>(); |
| if (!status.ok()) return status; |
| |
| util::Status key_size = ValidatePrivateKeySize(key.GetKey().size()); |
| if (!key_size.ok()) { |
| return key_size; |
| } |
| |
| util::Status valid_parameters = ValidateParams(key.GetParams()); |
| if (!valid_parameters.ok()) { |
| return valid_parameters; |
| } |
| |
| return {absl::WrapUnique(new SphincsSign(std::move(key)))}; |
| } |
| |
| util::StatusOr<std::string> SphincsSign::Sign(absl::string_view data) const { |
| util::StatusOr<int32> key_size_index = |
| SphincsKeySizeToIndex(key_.GetKey().size()); |
| if (!key_size_index.ok()) { |
| return key_size_index.status(); |
| } |
| |
| size_t sig_length; |
| SphincsParamsPqclean params = key_.GetParams(); |
| const SphincsHelperPqclean &sphincs_helper_pqclean = |
| GetSphincsHelperPqclean(params.hash_type, params.variant, *key_size_index, |
| params.sig_length_type); |
| std::string signature(sphincs_helper_pqclean.GetSignatureLength(), '0'); |
| |
| if ((sphincs_helper_pqclean.Sign( |
| reinterpret_cast<uint8_t *>(signature.data()), &sig_length, |
| reinterpret_cast<const uint8_t *>(data.data()), data.size(), |
| reinterpret_cast<const uint8_t *>(key_.GetKey().data())) != 0)) { |
| return util::Status(absl::StatusCode::kInternal, "Signing failed."); |
| } |
| |
| return signature; |
| } |
| |
| } // namespace subtle |
| } // namespace tink |
| } // namespace crypto |