| // 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/jwt/internal/raw_jwt_hmac_key_manager.h" |
| |
| #include <map> |
| |
| #include "absl/status/status.h" |
| #include "absl/strings/string_view.h" |
| #include "tink/mac.h" |
| #include "tink/subtle/hmac_boringssl.h" |
| #include "tink/subtle/random.h" |
| #include "tink/util/enums.h" |
| #include "tink/util/errors.h" |
| #include "tink/util/input_stream_util.h" |
| #include "tink/util/protobuf_helper.h" |
| #include "tink/util/status.h" |
| #include "tink/util/statusor.h" |
| #include "tink/util/validation.h" |
| #include "proto/common.pb.h" |
| #include "proto/jwt_hmac.pb.h" |
| #include "proto/tink.pb.h" |
| |
| namespace crypto { |
| namespace tink { |
| namespace jwt_internal { |
| |
| using crypto::tink::util::Status; |
| using crypto::tink::util::StatusOr; |
| using google::crypto::tink::JwtHmacAlgorithm; |
| using google::crypto::tink::JwtHmacKey; |
| using google::crypto::tink::JwtHmacKeyFormat; |
| |
| namespace { |
| |
| constexpr int kMinKeySizeInBytes = 32; |
| |
| StatusOr<int> MinimumKeySize(const JwtHmacAlgorithm& algorithm) { |
| switch (algorithm) { |
| case JwtHmacAlgorithm::HS256: |
| return 32; |
| case JwtHmacAlgorithm::HS384: |
| return 48; |
| case JwtHmacAlgorithm::HS512: |
| return 64; |
| default: |
| return Status(absl::StatusCode::kInvalidArgument, |
| "Unsupported algorithm."); |
| } |
| } |
| |
| } // namespace |
| |
| StatusOr<JwtHmacKey> RawJwtHmacKeyManager::CreateKey( |
| const JwtHmacKeyFormat& jwt_hmac_key_format) const { |
| JwtHmacKey jwt_hmac_key; |
| jwt_hmac_key.set_version(get_version()); |
| jwt_hmac_key.set_algorithm(jwt_hmac_key_format.algorithm()); |
| jwt_hmac_key.set_key_value( |
| subtle::Random::GetRandomBytes(jwt_hmac_key_format.key_size())); |
| return jwt_hmac_key; |
| } |
| |
| StatusOr<JwtHmacKey> RawJwtHmacKeyManager::DeriveKey( |
| const JwtHmacKeyFormat& jwt_hmac_key_format, |
| InputStream* input_stream) const { |
| return util::Status(absl::StatusCode::kUnimplemented, |
| "RawJwtHmacKeyManager::DeriveKey is not implemented"); |
| } |
| |
| Status RawJwtHmacKeyManager::ValidateKey(const JwtHmacKey& key) const { |
| Status status = ValidateVersion(key.version(), get_version()); |
| if (!status.ok()) return status; |
| StatusOr<int> min_key_size = MinimumKeySize(key.algorithm()); |
| if (!min_key_size.ok()) { |
| return min_key_size.status(); |
| } |
| if (key.key_value().size() < *min_key_size) { |
| return util::Status(absl::StatusCode::kInvalidArgument, |
| "Invalid JwtHmacKey: key_value is too short."); |
| } |
| return util::OkStatus(); |
| } |
| |
| // static |
| Status RawJwtHmacKeyManager::ValidateKeyFormat( |
| const JwtHmacKeyFormat& key_format) const { |
| StatusOr<int> min_key_size = MinimumKeySize(key_format.algorithm()); |
| if (!min_key_size.ok()) { |
| return min_key_size.status(); |
| } |
| if (key_format.key_size() < *min_key_size) { |
| return util::Status(absl::StatusCode::kInvalidArgument, |
| "Invalid HmacKeyFormat: key_size is too small."); |
| } |
| return util::OkStatus(); |
| } |
| |
| } // namespace jwt_internal |
| } // namespace tink |
| } // namespace crypto |