1 /* 2 * Copyright 2015 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_EC_KEY_FACTORY_H_ 18 #define SYSTEM_KEYMASTER_EC_KEY_FACTORY_H_ 19 20 #include <openssl/ec.h> 21 #include <openssl/evp.h> 22 23 #include <keymaster/asymmetric_key_factory.h> 24 25 namespace keymaster { 26 27 class EcKeyFactory : public AsymmetricKeyFactory { 28 public: 29 EcKeyFactory(const KeymasterContext* context) : AsymmetricKeyFactory(context) {} 30 31 keymaster_algorithm_t keymaster_key_type() const override { return KM_ALGORITHM_EC; } 32 int evp_key_type() const override { return EVP_PKEY_EC; } 33 34 keymaster_error_t GenerateKey(const AuthorizationSet& key_description, 35 KeymasterKeyBlob* key_blob, AuthorizationSet* hw_enforced, 36 AuthorizationSet* sw_enforced) const override; 37 keymaster_error_t ImportKey(const AuthorizationSet& key_description, 38 keymaster_key_format_t input_key_material_format, 39 const KeymasterKeyBlob& input_key_material, 40 KeymasterKeyBlob* output_key_blob, AuthorizationSet* hw_enforced, 41 AuthorizationSet* sw_enforced) const override; 42 43 keymaster_error_t CreateEmptyKey(const AuthorizationSet& hw_enforced, 44 const AuthorizationSet& sw_enforced, 45 UniquePtr<AsymmetricKey>* key) const override; 46 47 keymaster_error_t UpdateImportKeyDescription(const AuthorizationSet& key_description, 48 keymaster_key_format_t key_format, 49 const KeymasterKeyBlob& key_material, 50 AuthorizationSet* updated_description, 51 uint32_t* key_size) const; 52 53 OperationFactory* GetOperationFactory(keymaster_purpose_t purpose) const override; 54 55 protected: 56 static EC_GROUP* ChooseGroup(size_t key_size_bits); 57 static EC_GROUP* ChooseGroup(keymaster_ec_curve_t ec_curve); 58 59 static keymaster_error_t GetCurveAndSize(const AuthorizationSet& key_description, 60 keymaster_ec_curve_t* curve, uint32_t* key_size_bits); 61 }; 62 63 } // namespace keymaster 64 65 #endif // SYSTEM_KEYMASTER_EC_KEY_FACTORY_H_ 66
