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/km_openssl/asymmetric_key.h>
18 
19 #include <keymaster/new.h>
20 
21 #include <openssl/asn1.h>
22 #include <openssl/stack.h>
23 #include <openssl/x509.h>
24 #include <openssl/x509v3.h>
25 
26 #include <keymaster/android_keymaster_utils.h>
27 #include <keymaster/attestation_record.h>
28 #include <keymaster/keymaster_context.h>
29 #include <keymaster/km_openssl/openssl_err.h>
30 #include <keymaster/km_openssl/openssl_utils.h>
31 
32 
33 namespace keymaster {
34 
35 keymaster_error_t AsymmetricKey::formatted_key_material(keymaster_key_format_t format,
36                                                         UniquePtr<uint8_t[]>* material,
37                                                         size_t* size) const {
38     if (format != KM_KEY_FORMAT_X509)
39         return KM_ERROR_UNSUPPORTED_KEY_FORMAT;
40 
41     if (material == nullptr || size == nullptr)
42         return KM_ERROR_OUTPUT_PARAMETER_NULL;
43 
44     EVP_PKEY_Ptr pkey(EVP_PKEY_new());
45     if (!InternalToEvp(pkey.get()))
46         return TranslateLastOpenSslError();
47 
48     int key_data_length = i2d_PUBKEY(pkey.get(), nullptr);
49     if (key_data_length <= 0)
50         return TranslateLastOpenSslError();
51 
52     material->reset(new(std::nothrow) uint8_t[key_data_length]);
53     if (material->get() == nullptr)
54         return KM_ERROR_MEMORY_ALLOCATION_FAILED;
55 
56     uint8_t* tmp = material->get();
57     if (i2d_PUBKEY(pkey.get(), &tmp) != key_data_length) {
58         material->reset();
59         return TranslateLastOpenSslError();
60     }
61 
62     *size = key_data_length;
63     return KM_ERROR_OK;
64 }
65 
66 }  // namespace keymaster
67