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 <keymaster/km_openssl/asymmetric_key.h>
22 #include <keymaster/km_openssl/openssl_err.h>
23 #include <keymaster/km_openssl/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(KeymasterKeyBlob && key_material,const AuthorizationSet &,AuthorizationSet && hw_enforced,AuthorizationSet && sw_enforced,UniquePtr<Key> * key) const41 keymaster_error_t AsymmetricKeyFactory::LoadKey(KeymasterKeyBlob&& key_material,
42 const AuthorizationSet& /* additional_params */,
43 AuthorizationSet&& hw_enforced,
44 AuthorizationSet&& sw_enforced,
45 UniquePtr<Key>* key) const {
46 UniquePtr<AsymmetricKey> asym_key;
47 keymaster_error_t error = CreateEmptyKey(move(hw_enforced), move(sw_enforced), &asym_key);
48 if (error != KM_ERROR_OK) return error;
49
50 const uint8_t* tmp = key_material.key_material;
51 asym_key->key_material() = move(key_material);
52
53 EVP_PKEY* pkey = d2i_PrivateKey(evp_key_type(), nullptr /* pkey */, &tmp,
54 asym_key->key_material().key_material_size);
55 if (!pkey) return TranslateLastOpenSslError();
56 UniquePtr<EVP_PKEY, EVP_PKEY_Delete> pkey_deleter(pkey);
57
58 if (!asym_key->EvpToInternal(pkey)) {
59 error = TranslateLastOpenSslError();
60 } else {
61 *key = std::move(asym_key);
62 }
63
64 return error;
65 }
66
67 } // namespace keymaster
68