| /* |
| * Copyright 2014 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #ifndef SYSTEM_KEYMASTER_HMAC_KEY_H_ |
| #define SYSTEM_KEYMASTER_HMAC_KEY_H_ |
| |
| #include "symmetric_key.h" |
| |
| namespace keymaster { |
| |
| const size_t kMinHmacLengthBits = 64; |
| const size_t kMinHmacKeyLengthBits = 64; |
| const size_t kMaxHmacKeyLengthBits = 2048; // Some RFC test cases require >1024-bit keys |
| |
| class HmacKeyFactory : public SymmetricKeyFactory { |
| public: |
| explicit HmacKeyFactory(const SoftwareKeyBlobMaker* blob_maker, |
| const RandomSource* random_source) : |
| SymmetricKeyFactory(blob_maker, random_source) {} |
| |
| keymaster_error_t LoadKey(KeymasterKeyBlob&& key_material, |
| const AuthorizationSet& additional_params, |
| AuthorizationSet&& hw_enforced, |
| AuthorizationSet&& sw_enforced, |
| UniquePtr<Key>* key) const override; |
| |
| OperationFactory* GetOperationFactory(keymaster_purpose_t purpose) const override; |
| |
| private: |
| bool key_size_supported(size_t key_size_bits) const override { |
| return key_size_bits > 0 && key_size_bits % 8 == 00 && |
| key_size_bits >= kMinHmacKeyLengthBits && key_size_bits <= kMaxHmacKeyLengthBits; |
| } |
| keymaster_error_t validate_algorithm_specific_new_key_params( |
| const AuthorizationSet& key_description) const override; |
| }; |
| |
| class HmacKey : public SymmetricKey { |
| public: |
| HmacKey(KeymasterKeyBlob&& key_material, AuthorizationSet&& hw_enforced, |
| AuthorizationSet&& sw_enforced, const KeyFactory* key_factory) |
| : SymmetricKey(move(key_material), move(hw_enforced), move(sw_enforced), key_factory) {} |
| }; |
| |
| } // namespace keymaster |
| |
| #endif // SYSTEM_KEYMASTER_HMAC_KEY_H_ |