1 /* 2 * Copyright 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SYSTEM_KEYMASTER_HMAC_KEY_H_ 18 #define SYSTEM_KEYMASTER_HMAC_KEY_H_ 19 20 #include "symmetric_key.h" 21 22 namespace keymaster { 23 24 const size_t kMinHmacLengthBits = 64; 25 26 class HmacKeyFactory : public SymmetricKeyFactory { 27 public: 28 HmacKeyFactory(const KeymasterContext* context) : SymmetricKeyFactory(context) {} 29 30 keymaster_error_t LoadKey(const KeymasterKeyBlob& key_material, 31 const AuthorizationSet& additional_params, 32 const AuthorizationSet& hw_enforced, 33 const AuthorizationSet& sw_enforced, 34 UniquePtr<Key>* key) const override; 35 36 OperationFactory* GetOperationFactory(keymaster_purpose_t purpose) const override; 37 38 private: 39 bool key_size_supported(size_t key_size_bits) const override { 40 return key_size_bits > 0 && key_size_bits % 8 == 00 && 41 key_size_bits <= 2048 /* Some RFC test cases require >1024-bit keys */; 42 } 43 keymaster_error_t validate_algorithm_specific_new_key_params( 44 const AuthorizationSet& key_description) const override; 45 }; 46 47 class HmacKey : public SymmetricKey { 48 public: 49 HmacKey(const KeymasterKeyBlob& key_material, const AuthorizationSet& hw_enforced, 50 const AuthorizationSet& sw_enforced, keymaster_error_t* error) 51 : SymmetricKey(key_material, hw_enforced, sw_enforced, error) {} 52 }; 53 54 } // namespace keymaster 55 56 #endif // SYSTEM_KEYMASTER_HMAC_KEY_H_ 57
