| // Copyright 2018 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/rsa_ssa_pss_verify_key_manager.h" |
| |
| #include "absl/strings/string_view.h" |
| #include "tink/public_key_verify.h" |
| #include "tink/subtle/rsa_ssa_pss_verify_boringssl.h" |
| #include "tink/subtle/subtle_util_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/rsa_ssa_pss.pb.h" |
| #include "proto/tink.pb.h" |
| |
| // TODO(quannguyen): |
| // + Validate salt length and possible e. |
| namespace crypto { |
| namespace tink { |
| |
| using crypto::tink::util::Enums; |
| using crypto::tink::util::Status; |
| using crypto::tink::util::StatusOr; |
| using google::crypto::tink::RsaSsaPssParams; |
| using google::crypto::tink::RsaSsaPssPublicKey; |
| |
| StatusOr<std::unique_ptr<PublicKeyVerify>> |
| RsaSsaPssVerifyKeyManager::PublicKeyVerifyFactory::Create( |
| const RsaSsaPssPublicKey& rsa_ssa_pss_public_key) const { |
| subtle::SubtleUtilBoringSSL::RsaPublicKey rsa_pub_key; |
| rsa_pub_key.n = rsa_ssa_pss_public_key.n(); |
| rsa_pub_key.e = rsa_ssa_pss_public_key.e(); |
| |
| subtle::SubtleUtilBoringSSL::RsaSsaPssParams params; |
| RsaSsaPssParams rsa_ssa_pss_params = rsa_ssa_pss_public_key.params(); |
| params.sig_hash = Enums::ProtoToSubtle(rsa_ssa_pss_params.sig_hash()); |
| params.mgf1_hash = Enums::ProtoToSubtle(rsa_ssa_pss_params.mgf1_hash()); |
| params.salt_length = rsa_ssa_pss_params.salt_length(); |
| |
| auto rsa_ssa_pss_result = |
| subtle::RsaSsaPssVerifyBoringSsl::New(rsa_pub_key, params); |
| if (!rsa_ssa_pss_result.ok()) return rsa_ssa_pss_result.status(); |
| return {std::move(rsa_ssa_pss_result).ValueOrDie()}; |
| } |
| |
| Status RsaSsaPssVerifyKeyManager::ValidateKey( |
| const RsaSsaPssPublicKey& key) const { |
| Status status = ValidateVersion(key.version(), get_version()); |
| if (!status.ok()) return status; |
| auto status_or_n = subtle::SubtleUtilBoringSSL::str2bn(key.n()); |
| if (!status_or_n.ok()) return status_or_n.status(); |
| auto modulus_status = subtle::SubtleUtilBoringSSL::ValidateRsaModulusSize( |
| BN_num_bits(status_or_n.ValueOrDie().get())); |
| if (!modulus_status.ok()) return modulus_status; |
| return ValidateParams(key.params()); |
| } |
| |
| Status RsaSsaPssVerifyKeyManager::ValidateParams( |
| const RsaSsaPssParams& params) const { |
| auto hash_result = subtle::SubtleUtilBoringSSL::ValidateSignatureHash( |
| Enums::ProtoToSubtle(params.sig_hash())); |
| if (!hash_result.ok()) return hash_result; |
| // The most common use case is that MGF1 hash is the same as signature hash. |
| // This is recommended by RFC https://tools.ietf.org/html/rfc8017#section-8.1. |
| // While using different hashes doesn't cause security vulnerabilities, there |
| // is also no good reason to support different hashes. Furthermore: |
| // |
| // - Golang does not support different hashes. |
| // |
| // - BoringSSL supports different hashes just because of historical reason. |
| // There is no real use case. |
| // |
| // - Conscrypt/BouncyCastle do not support different hashes. |
| if (params.mgf1_hash() != params.sig_hash()) { |
| return ToStatusF(util::error::INVALID_ARGUMENT, |
| "MGF1 hash '%d' is different from signature hash '%d'", |
| params.mgf1_hash(), params.sig_hash()); |
| } |
| return Status::OK; |
| } |
| |
| } // namespace tink |
| } // namespace crypto |