| // 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/falcon_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/falcon_subtle_utils.h" |
| #include "tink/util/secret_data.h" |
| #include "tink/util/statusor.h" |
| |
| extern "C" { |
| #include "third_party/pqclean/crypto_sign/falcon-1024/api.h" |
| #include "third_party/pqclean/crypto_sign/falcon-512/api.h" |
| } |
| |
| namespace crypto { |
| namespace tink { |
| namespace subtle { |
| |
| // static |
| util::StatusOr<std::unique_ptr<PublicKeySign>> FalconSign::New( |
| const FalconPrivateKeyPqclean& key) { |
| auto status = internal::CheckFipsCompatibility<FalconSign>(); |
| if (!status.ok()) return status; |
| |
| return {absl::WrapUnique(new FalconSign(key))}; |
| } |
| |
| util::StatusOr<std::string> FalconSign::Sign(absl::string_view data) const { |
| size_t sig_length; |
| int32_t key_size = private_key_.GetKey().size(); |
| std::string signature; |
| int result = 1; |
| |
| switch (key_size) { |
| case kFalcon512PrivateKeySize: { |
| signature.resize(PQCLEAN_FALCON512_CRYPTO_BYTES, '0'); |
| result = PQCLEAN_FALCON512_crypto_sign_signature( |
| reinterpret_cast<uint8_t *>(signature.data()), &sig_length, |
| reinterpret_cast<const uint8_t *>(data.data()), data.size(), |
| reinterpret_cast<const uint8_t *>(private_key_.GetKey().data())); |
| if (sig_length > PQCLEAN_FALCON512_CRYPTO_BYTES) { |
| result = -1; |
| } |
| break; |
| } |
| case kFalcon1024PrivateKeySize: { |
| signature.resize(PQCLEAN_FALCON1024_CRYPTO_BYTES, '0'); |
| result = PQCLEAN_FALCON1024_crypto_sign_signature( |
| reinterpret_cast<uint8_t *>(signature.data()), &sig_length, |
| reinterpret_cast<const uint8_t *>(data.data()), data.size(), |
| reinterpret_cast<const uint8_t *>(private_key_.GetKey().data())); |
| if (sig_length > PQCLEAN_FALCON1024_CRYPTO_BYTES) { |
| result = -1; |
| } |
| break; |
| } |
| default: |
| return util::Status(absl::StatusCode::kInvalidArgument, |
| "Invalid keysize."); |
| } |
| |
| if (result != 0) { |
| return util::Status(absl::StatusCode::kInternal, "Signing failed."); |
| } |
| |
| signature.resize(sig_length); |
| return signature; |
| } |
| |
| } // namespace subtle |
| } // namespace tink |
| } // namespace crypto |