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 #include <keymaster/asymmetric_key_factory.h>
18
19 #include <keymaster/android_keymaster_utils.h>
20
21 #include "asymmetric_key.h"
22 #include "openssl_err.h"
23 #include "openssl_utils.h"
24
25 namespace keymaster {
26
27 static const keymaster_key_format_t supported_import_formats[] = {KM_KEY_FORMAT_PKCS8};
28 const keymaster_key_format_t*
SupportedImportFormats(size_t * format_count) const29 AsymmetricKeyFactory::SupportedImportFormats(size_t* format_count) const {
30 *format_count = array_length(supported_import_formats);
31 return supported_import_formats;
32 }
33
34 static const keymaster_key_format_t supported_export_formats[] = {KM_KEY_FORMAT_X509};
35 const keymaster_key_format_t*
SupportedExportFormats(size_t * format_count) const36 AsymmetricKeyFactory::SupportedExportFormats(size_t* format_count) const {
37 *format_count = array_length(supported_export_formats);
38 return supported_export_formats;
39 }
40
LoadKey(const KeymasterKeyBlob & key_material,const AuthorizationSet & hw_enforced,const AuthorizationSet & sw_enforced,UniquePtr<Key> * key) const41 keymaster_error_t AsymmetricKeyFactory::LoadKey(const KeymasterKeyBlob& key_material,
42 const AuthorizationSet& hw_enforced,
43 const AuthorizationSet& sw_enforced,
44 UniquePtr<Key>* key) const {
45 UniquePtr<AsymmetricKey> asymmetric_key;
46 keymaster_error_t error = CreateEmptyKey(hw_enforced, sw_enforced, &asymmetric_key);
47 if (error != KM_ERROR_OK)
48 return error;
49
50 const uint8_t* tmp = key_material.key_material;
51 EVP_PKEY* pkey =
52 d2i_PrivateKey(evp_key_type(), NULL /* pkey */, &tmp, key_material.key_material_size);
53 if (!pkey)
54 return TranslateLastOpenSslError();
55 UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey_deleter(pkey);
56
57 if (!asymmetric_key->EvpToInternal(pkey))
58 error = TranslateLastOpenSslError();
59 else
60 key->reset(asymmetric_key.release());
61
62 return error;
63 }
64
65 } // namespace keymaster
66