1 /* Copyright 2017 The Android Open Source Project
2  *
3  * Redistribution and use in source and binary forms, with or without
4  * modification, are permitted provided that the following conditions
5  * are met:
6  * 1. Redistributions of source code must retain the above copyright
7  *    notice, this list of conditions and the following disclaimer.
8  * 2. Redistributions in binary form must reproduce the above copyright
9  *    notice, this list of conditions and the following disclaimer in the
10  *    documentation and/or other materials provided with the distribution.
11  *
12  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
13  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
14  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
15  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
16  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
17  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
18  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
19  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
20  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
21  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
22 
23 #include "keystore_backend_hidl.h"
24 
25 #include <android/system/wifi/keystore/1.0/IKeystore.h>
26 #include <log/log.h>
27 
28 using android::hardware::hidl_vec;
29 using android::hardware::Return;
30 using android::sp;
31 using android::system::wifi::keystore::V1_0::IKeystore;
32 
33 int32_t KeystoreBackendHidl::sign(
34         const char *key_id, const uint8_t* in, size_t len, uint8_t** reply,
35         size_t* reply_len) {
36     if (key_id == nullptr || in == nullptr || reply == nullptr || reply_len == nullptr) {
37         ALOGE("Null pointer argument passed");
38         return -1;
39     }
40 
41     sp<IKeystore> service = IKeystore::tryGetService();
42     if (service == nullptr) {
43         ALOGE("could not contact keystore HAL");
44         return -1;
45     }
46 
47     bool success = false;
48     auto cb = [&](IKeystore::KeystoreStatusCode status,
49                   hidl_vec<uint8_t> signedData) {
50       if (status == IKeystore::KeystoreStatusCode::SUCCESS) {
51           *reply_len = signedData.size();
52           *reply = signedData.releaseData();
53           success = true;
54       }
55     };
56     Return<void> ret = service->sign(
57         key_id, std::vector<uint8_t>(in, in + len), cb);
58     if (!ret.isOk() || !success) {
59         return 1;
60     }
61     return 0;
62 }
63 
64 int32_t KeystoreBackendHidl::get_pubkey(
65         const char *key_id, uint8_t** pubkey, size_t* pubkey_len) {
66     if (key_id == nullptr || pubkey == nullptr || pubkey_len == nullptr) {
67         ALOGE("Null pointer argument passed");
68         return -1;
69     }
70 
71     sp<IKeystore> service = IKeystore::tryGetService();
72     if (service == nullptr) {
73         ALOGE("could not contact keystore HAL");
74         return -1;
75     }
76 
77     bool success = false;
78     auto cb = [&](IKeystore::KeystoreStatusCode status,
79                   hidl_vec<uint8_t> publicKey) {
80       if (status == IKeystore::KeystoreStatusCode::SUCCESS) {
81           *pubkey_len = publicKey.size();
82           *pubkey = publicKey.releaseData();
83           success = true;
84       }
85     };
86     Return<void> ret = service->getPublicKey(key_id, cb);
87     if (!ret.isOk() || !success) {
88         return 1;
89     }
90     return 0;
91 }
92