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| // Copyright 2024 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. | ||
| // | ||
| //////////////////////////////////////////////////////////////////////////////// | ||
|
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| #include "tink/hybrid/ecies_parameters.h" | ||
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| #include <memory> | ||
| #include <set> | ||
| #include <string> | ||
|
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| #include "absl/status/status.h" | ||
| #include "absl/strings/str_cat.h" | ||
| #include "absl/strings/string_view.h" | ||
| #include "absl/types/optional.h" | ||
| #include "tink/aead/aes_gcm_parameters.h" | ||
| #include "tink/daead/aes_siv_parameters.h" | ||
| #include "tink/parameters.h" | ||
| #include "tink/util/status.h" | ||
| #include "tink/util/statusor.h" | ||
|
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| namespace crypto { | ||
| namespace tink { | ||
| namespace { | ||
|
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| bool IsNistCurve(EciesParameters::CurveType curve_type) { | ||
| return curve_type == EciesParameters::CurveType::kNistP256 || | ||
| curve_type == EciesParameters::CurveType::kNistP384 || | ||
| curve_type == EciesParameters::CurveType::kNistP521; | ||
| } | ||
|
|
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| } // namespace | ||
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| EciesParameters::Builder& EciesParameters::Builder::SetCurveType( | ||
| CurveType curve_type) { | ||
| curve_type_ = curve_type; | ||
| return *this; | ||
| } | ||
|
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| EciesParameters::Builder& EciesParameters::Builder::SetHashType( | ||
| HashType hash_type) { | ||
| hash_type_ = hash_type; | ||
| return *this; | ||
| } | ||
|
|
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| EciesParameters::Builder& EciesParameters::Builder::SetNistCurvePointFormat( | ||
| PointFormat point_format) { | ||
| point_format_ = point_format; | ||
| return *this; | ||
| } | ||
|
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| EciesParameters::Builder& EciesParameters::Builder::SetDemId(DemId dem_id) { | ||
| dem_id_ = dem_id; | ||
| return *this; | ||
| } | ||
|
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| EciesParameters::Builder& EciesParameters::Builder::SetSalt( | ||
| absl::string_view salt) { | ||
| if (!salt.empty()) { | ||
| salt_ = std::string(salt); | ||
| } | ||
| return *this; | ||
| } | ||
|
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| EciesParameters::Builder& EciesParameters::Builder::SetVariant( | ||
| Variant variant) { | ||
| variant_ = variant; | ||
| return *this; | ||
| } | ||
|
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| util::StatusOr<EciesParameters> EciesParameters::Builder::Build() { | ||
| static const std::set<CurveType>* kSupportedCurves = | ||
| new std::set<CurveType>({CurveType::kNistP256, CurveType::kNistP384, | ||
| CurveType::kNistP521, CurveType::kX25519}); | ||
| if (kSupportedCurves->find(curve_type_) == kSupportedCurves->end()) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| "Cannot create ECIES parameters with unknown curve type."); | ||
| } | ||
|
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| static const std::set<HashType>* kSupportedHashes = new std::set<HashType>( | ||
| {HashType::kSha1, HashType::kSha224, HashType::kSha256, HashType::kSha384, | ||
| HashType::kSha512}); | ||
| if (kSupportedHashes->find(hash_type_) == kSupportedHashes->end()) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| "Cannot create ECIES parameters with unknown hash type."); | ||
| } | ||
|
|
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| static const std::set<absl::optional<PointFormat>>* kSupportedPointFormats = | ||
| new std::set<absl::optional<PointFormat>>( | ||
| {PointFormat::kCompressed, PointFormat::kUncompressed, | ||
| PointFormat::kLegacyUncompressed, absl::nullopt}); | ||
| if (kSupportedPointFormats->find(point_format_) == | ||
| kSupportedPointFormats->end()) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| "Cannot create ECIES parameters with unknown point format."); | ||
| } | ||
|
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| static const std::set<DemId>* kSupportedDemIds = new std::set<DemId>( | ||
| {DemId::kAes128GcmRaw, DemId::kAes256GcmRaw, DemId::kAes256SivRaw}); | ||
| if (kSupportedDemIds->find(dem_id_) == kSupportedDemIds->end()) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "Cannot create ECIES parameters with unknown DEM."); | ||
| } | ||
|
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| static const std::set<Variant>* kSupportedVariants = new std::set<Variant>( | ||
| {Variant::kTink, Variant::kCrunchy, Variant::kNoPrefix}); | ||
| if (kSupportedVariants->find(variant_) == kSupportedVariants->end()) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "Cannot create ECIES parameters with unknown variant."); | ||
| } | ||
|
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| if (curve_type_ == EciesParameters::CurveType::kX25519 && | ||
| point_format_.has_value()) { | ||
| return util::Status( | ||
| absl::StatusCode::kInvalidArgument, | ||
| "Point format must not be specified for the X25519 curve."); | ||
| } | ||
|
|
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| if (IsNistCurve(curve_type_) && !point_format_.has_value()) { | ||
| return util::Status(absl::StatusCode::kInvalidArgument, | ||
| "Point format must be specified for a NIST curve."); | ||
| } | ||
|
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| return EciesParameters(curve_type_, hash_type_, point_format_, dem_id_, salt_, | ||
| variant_); | ||
| } | ||
|
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| util::StatusOr<std::unique_ptr<Parameters>> | ||
| EciesParameters::CreateDemParameters() const { | ||
| switch (dem_id_) { | ||
| case DemId::kAes128GcmRaw: { | ||
| util::StatusOr<AesGcmParameters> aes_128_gcm_raw = | ||
| AesGcmParameters::Builder() | ||
| .SetKeySizeInBytes(16) | ||
| .SetIvSizeInBytes(12) | ||
| .SetTagSizeInBytes(16) | ||
| .SetVariant(AesGcmParameters::Variant::kNoPrefix) | ||
| .Build(); | ||
| if (!aes_128_gcm_raw.ok()) { | ||
| return aes_128_gcm_raw.status(); | ||
| } | ||
| return std::make_unique<AesGcmParameters>(*aes_128_gcm_raw); | ||
| } | ||
|
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||
| case DemId::kAes256GcmRaw: { | ||
| util::StatusOr<AesGcmParameters> aes_256_gcm_raw = | ||
| AesGcmParameters::Builder() | ||
| .SetKeySizeInBytes(32) | ||
| .SetIvSizeInBytes(12) | ||
| .SetTagSizeInBytes(16) | ||
| .SetVariant(AesGcmParameters::Variant::kNoPrefix) | ||
| .Build(); | ||
| if (!aes_256_gcm_raw.ok()) { | ||
| return aes_256_gcm_raw.status(); | ||
| } | ||
| return std::make_unique<AesGcmParameters>(*aes_256_gcm_raw); | ||
| } | ||
|
|
||
| case DemId::kAes256SivRaw: { | ||
| util::StatusOr<AesSivParameters> aes_256_siv_raw = | ||
| AesSivParameters::Create(/*key_size_in_bytes=*/64, | ||
| AesSivParameters::Variant::kNoPrefix); | ||
| if (!aes_256_siv_raw.ok()) { | ||
| return aes_256_siv_raw.status(); | ||
| } | ||
| return std::make_unique<AesSivParameters>(*aes_256_siv_raw); | ||
| } | ||
|
|
||
| default: | ||
| return util::Status( | ||
| absl::StatusCode::kInternal, | ||
| absl::StrCat("Cannot create DEM parameters for DEM id: ", dem_id_)); | ||
| } | ||
| } | ||
|
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| bool EciesParameters::operator==(const Parameters& other) const { | ||
| const EciesParameters* that = dynamic_cast<const EciesParameters*>(&other); | ||
| if (that == nullptr) { | ||
| return false; | ||
| } | ||
| if (curve_type_ != that->curve_type_) { | ||
| return false; | ||
| } | ||
| if (hash_type_ != that->hash_type_) { | ||
| return false; | ||
| } | ||
| if (point_format_ != that->point_format_) { | ||
| return false; | ||
| } | ||
| if (dem_id_ != that->dem_id_) { | ||
| return false; | ||
| } | ||
| if (salt_ != that->salt_) { | ||
| return false; | ||
| } | ||
| if (variant_ != that->variant_) { | ||
| return false; | ||
| } | ||
| return true; | ||
| } | ||
|
|
||
| } // namespace tink | ||
| } // namespace crypto |
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