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
25namespace keymaster {
26
27class EcKeyFactory : public AsymmetricKeyFactory {
28  public:
29    explicit 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