| // 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/ecdsa_verify_key_manager.h" |
| |
| #include <utility> |
| |
| #include "absl/status/status.h" |
| #include "absl/strings/string_view.h" |
| #include "tink/internal/ec_util.h" |
| #include "tink/public_key_verify.h" |
| #include "tink/subtle/ecdsa_verify_boringssl.h" |
| #include "tink/util/enums.h" |
| #include "tink/util/errors.h" |
| #include "tink/util/protobuf_helper.h" |
| #include "tink/util/status.h" |
| #include "tink/util/statusor.h" |
| #include "tink/util/validation.h" |
| #include "proto/ecdsa.pb.h" |
| |
| namespace crypto { |
| namespace tink { |
| |
| using crypto::tink::util::Enums; |
| using crypto::tink::util::Status; |
| using crypto::tink::util::StatusOr; |
| using google::crypto::tink::EcdsaParams; |
| using google::crypto::tink::EcdsaPublicKey; |
| using google::crypto::tink::EcdsaSignatureEncoding; |
| using google::crypto::tink::EllipticCurveType; |
| using google::crypto::tink::HashType; |
| |
| StatusOr<std::unique_ptr<PublicKeyVerify>> |
| EcdsaVerifyKeyManager::PublicKeyVerifyFactory::Create( |
| const EcdsaPublicKey& ecdsa_public_key) const { |
| internal::EcKey ec_key; |
| ec_key.curve = Enums::ProtoToSubtle(ecdsa_public_key.params().curve()); |
| ec_key.pub_x = ecdsa_public_key.x(); |
| ec_key.pub_y = ecdsa_public_key.y(); |
| auto result = subtle::EcdsaVerifyBoringSsl::New( |
| ec_key, Enums::ProtoToSubtle(ecdsa_public_key.params().hash_type()), |
| Enums::ProtoToSubtle(ecdsa_public_key.params().encoding())); |
| if (!result.ok()) return result.status(); |
| return {std::move(result.value())}; |
| } |
| |
| Status EcdsaVerifyKeyManager::ValidateParams(const EcdsaParams& params) const { |
| switch (params.encoding()) { |
| case EcdsaSignatureEncoding::DER: // fall through |
| case EcdsaSignatureEncoding::IEEE_P1363: |
| break; |
| default: |
| return ToStatusF(absl::StatusCode::kInvalidArgument, |
| "Unsupported signature encoding: %d", params.encoding()); |
| } |
| switch (params.curve()) { |
| case EllipticCurveType::NIST_P256: |
| // Using SHA512 for curve P256 is fine. However, only the 256 |
| // leftmost bits of the hash is used in signature computation. |
| // Therefore, we don't allow it here to prevent security illusion. |
| if (params.hash_type() != HashType::SHA256) { |
| return Status(absl::StatusCode::kInvalidArgument, |
| "Only SHA256 is supported for NIST P256."); |
| } |
| break; |
| case EllipticCurveType::NIST_P384: |
| // Allow using SHA384 and SHA512 with NIST-P384. |
| if ((params.hash_type() != HashType::SHA384) && |
| (params.hash_type() != HashType::SHA512)) { |
| return Status(absl::StatusCode::kInvalidArgument, |
| "Only SHA384 and SHA512 are supported for this curve."); |
| } |
| break; |
| case EllipticCurveType::NIST_P521: |
| if (params.hash_type() != HashType::SHA512) { |
| return Status(absl::StatusCode::kInvalidArgument, |
| "Only SHA512 is supported for this curve."); |
| } |
| break; |
| default: |
| return Status(absl::StatusCode::kInvalidArgument, |
| "Unsupported elliptic curve"); |
| } |
| return util::OkStatus(); |
| } |
| |
| Status EcdsaVerifyKeyManager::ValidateKey(const EcdsaPublicKey& key) const { |
| Status status = ValidateVersion(key.version(), get_version()); |
| if (!status.ok()) return status; |
| return ValidateParams(key.params()); |
| } |
| |
| } // namespace tink |
| } // namespace crypto |