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 #pragma once 18 19 #include <openssl/ec.h> 20 #include <openssl/evp.h> 21 22 #include <keymaster/asymmetric_key_factory.h> 23 #include <keymaster/soft_key_factory.h> 24 25 namespace keymaster { 26 27 class EcKeyFactory : public AsymmetricKeyFactory, public SoftKeyFactoryMixin { 28 public: EcKeyFactory(const SoftwareKeyBlobMaker & blob_maker,const KeymasterContext & context)29 explicit EcKeyFactory(const SoftwareKeyBlobMaker& blob_maker, const KeymasterContext& context) 30 : AsymmetricKeyFactory(context), SoftKeyFactoryMixin(blob_maker) {} 31 keymaster_key_type()32 keymaster_algorithm_t keymaster_key_type() const override { return KM_ALGORITHM_EC; } 33 34 keymaster_error_t GenerateKey(const AuthorizationSet& key_description, 35 UniquePtr<Key> attest_key, // 36 const KeymasterBlob& issuer_subject, // 37 KeymasterKeyBlob* key_blob, 38 AuthorizationSet* hw_enforced, // 39 AuthorizationSet* sw_enforced, 40 CertificateChain* cert_chain) const override; 41 keymaster_error_t ImportKey(const AuthorizationSet& key_description, 42 keymaster_key_format_t input_key_material_format, 43 const KeymasterKeyBlob& input_key_material, 44 UniquePtr<Key> attest_key, // 45 const KeymasterBlob& issuer_subject, 46 KeymasterKeyBlob* output_key_blob, // 47 AuthorizationSet* hw_enforced, // 48 AuthorizationSet* sw_enforced, 49 CertificateChain* cert_chain) const override; 50 51 keymaster_error_t ImportRawKey(const AuthorizationSet& key_description, 52 const KeymasterKeyBlob& input_key_material, 53 UniquePtr<Key> attest_key, // 54 const KeymasterBlob& issuer_subject, 55 KeymasterKeyBlob* output_key_blob, // 56 AuthorizationSet* hw_enforced, // 57 AuthorizationSet* sw_enforced, 58 CertificateChain* cert_chain) const; 59 60 keymaster_error_t CreateEmptyKey(AuthorizationSet&& hw_enforced, AuthorizationSet&& sw_enforced, 61 UniquePtr<AsymmetricKey>* key) const override; 62 63 keymaster_error_t UpdateImportKeyDescription(const AuthorizationSet& key_description, 64 keymaster_key_format_t key_format, 65 const KeymasterKeyBlob& key_material, 66 AuthorizationSet* updated_description, 67 uint32_t* key_size) const; 68 69 OperationFactory* GetOperationFactory(keymaster_purpose_t purpose) const override; 70 71 protected: 72 static EC_GROUP* ChooseGroup(size_t key_size_bits); 73 static EC_GROUP* ChooseGroup(keymaster_ec_curve_t ec_curve); 74 75 static keymaster_error_t GetCurveAndSize(const AuthorizationSet& key_description, 76 keymaster_ec_curve_t* curve, uint32_t* key_size_bits); 77 }; 78 79 } // namespace keymaster 80