| // 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_sign_key_manager.h" |
| |
| #include "absl/memory/memory.h" |
| #include "absl/strings/string_view.h" |
| #include "tink/public_key_sign.h" |
| #include "tink/signature/rsa_ssa_pss_verify_key_manager.h" |
| #include "tink/signature/sig_util.h" |
| #include "tink/subtle/rsa_ssa_pss_sign_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/secret_data.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" |
| |
| namespace crypto { |
| namespace tink { |
| |
| using crypto::tink::util::Enums; |
| using crypto::tink::util::Status; |
| using crypto::tink::util::StatusOr; |
| using google::crypto::tink::RsaSsaPssKeyFormat; |
| using google::crypto::tink::RsaSsaPssParams; |
| using google::crypto::tink::RsaSsaPssPrivateKey; |
| |
| namespace { |
| std::unique_ptr<RsaSsaPssPrivateKey> RsaPrivateKeySubtleToProto( |
| const subtle::SubtleUtilBoringSSL::RsaPrivateKey& private_key) { |
| auto key_proto = absl::make_unique<RsaSsaPssPrivateKey>(); |
| key_proto->set_version(RsaSsaPssSignKeyManager().get_version()); |
| key_proto->set_d(std::string(util::SecretDataAsStringView(private_key.d))); |
| key_proto->set_p(std::string(util::SecretDataAsStringView(private_key.p))); |
| key_proto->set_q(std::string(util::SecretDataAsStringView(private_key.q))); |
| key_proto->set_dp(std::string(util::SecretDataAsStringView(private_key.dp))); |
| key_proto->set_dq(std::string(util::SecretDataAsStringView(private_key.dq))); |
| key_proto->set_crt( |
| std::string(util::SecretDataAsStringView(private_key.crt))); |
| auto* public_key_proto = key_proto->mutable_public_key(); |
| public_key_proto->set_version(RsaSsaPssSignKeyManager().get_version()); |
| public_key_proto->set_n(private_key.n); |
| public_key_proto->set_e(private_key.e); |
| return key_proto; |
| } |
| |
| subtle::SubtleUtilBoringSSL::RsaPrivateKey RsaPrivateKeyProtoToSubtle( |
| const RsaSsaPssPrivateKey& key_proto) { |
| subtle::SubtleUtilBoringSSL::RsaPrivateKey key; |
| key.n = key_proto.public_key().n(); |
| key.e = key_proto.public_key().e(); |
| key.d = util::SecretDataFromStringView(key_proto.d()); |
| key.p = util::SecretDataFromStringView(key_proto.p()); |
| key.q = util::SecretDataFromStringView(key_proto.q()); |
| key.dp = util::SecretDataFromStringView(key_proto.dp()); |
| key.dq = util::SecretDataFromStringView(key_proto.dq()); |
| key.crt = util::SecretDataFromStringView(key_proto.crt()); |
| return key; |
| } |
| |
| } // namespace |
| |
| StatusOr<RsaSsaPssPrivateKey> RsaSsaPssSignKeyManager::CreateKey( |
| const RsaSsaPssKeyFormat& key_format) const { |
| auto e = subtle::SubtleUtilBoringSSL::str2bn( |
| key_format.public_exponent()); |
| if (!e.ok()) return e.status(); |
| |
| subtle::SubtleUtilBoringSSL::RsaPrivateKey private_key; |
| subtle::SubtleUtilBoringSSL::RsaPublicKey public_key; |
| util::Status status = subtle::SubtleUtilBoringSSL::GetNewRsaKeyPair( |
| key_format.modulus_size_in_bits(), e.ValueOrDie().get(), |
| &private_key, &public_key); |
| if (!status.ok()) return status; |
| |
| RsaSsaPssPrivateKey key_proto = |
| std::move(*RsaPrivateKeySubtleToProto(private_key)); |
| *key_proto.mutable_public_key()->mutable_params() = key_format.params(); |
| return key_proto; |
| } |
| |
| StatusOr<std::unique_ptr<PublicKeySign>> |
| RsaSsaPssSignKeyManager::PublicKeySignFactory::Create( |
| const RsaSsaPssPrivateKey& private_key) const { |
| auto key = RsaPrivateKeyProtoToSubtle(private_key); |
| subtle::SubtleUtilBoringSSL::RsaSsaPssParams params; |
| const RsaSsaPssParams& params_proto = private_key.public_key().params(); |
| params.sig_hash = Enums::ProtoToSubtle(params_proto.sig_hash()); |
| params.mgf1_hash = Enums::ProtoToSubtle(params_proto.mgf1_hash()); |
| params.salt_length = params_proto.salt_length(); |
| auto signer = subtle::RsaSsaPssSignBoringSsl::New(key, params); |
| if (!signer.ok()) return signer.status(); |
| // To check that the key is correct, we sign a test message with private key |
| // and verify with public key. |
| auto verifier = RsaSsaPssVerifyKeyManager().GetPrimitive<PublicKeyVerify>( |
| private_key.public_key()); |
| if (!verifier.ok()) return verifier.status(); |
| auto sign_verify_result = |
| SignAndVerify(signer.ValueOrDie().get(), verifier.ValueOrDie().get()); |
| if (!sign_verify_result.ok()) { |
| return util::Status(util::error::INTERNAL, |
| "security bug: signing with private key followed by " |
| "verifying with public key failed"); |
| } |
| return signer; |
| } |
| |
| Status RsaSsaPssSignKeyManager::ValidateKey( |
| const RsaSsaPssPrivateKey& key) const { |
| Status status = ValidateVersion(key.version(), get_version()); |
| if (!status.ok()) return status; |
| return RsaSsaPssVerifyKeyManager().ValidateKey(key.public_key()); |
| } |
| |
| Status RsaSsaPssSignKeyManager::ValidateKeyFormat( |
| const RsaSsaPssKeyFormat& key_format) const { |
| auto modulus_status = subtle::SubtleUtilBoringSSL::ValidateRsaModulusSize( |
| key_format.modulus_size_in_bits()); |
| if (!modulus_status.ok()) return modulus_status; |
| return RsaSsaPssVerifyKeyManager().ValidateParams(key_format.params()); |
| } |
| |
| } // namespace tink |
| } // namespace crypto |