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_binder.h"
24
25#include <binder/IServiceManager.h>
26#include <keystore/keystore.h>
27#include <keystore/IKeystoreService.h>
28#include <keystore/keystore_hidl_support.h>
29
30using namespace android;
31using keystore::blob2hidlVec;
32using keystore::hidl_vec;
33
34namespace {
35const char keystore_service_name[] = "android.security.keystore";
36};
37
38int32_t KeystoreBackendBinder::sign(
39        const char *key_id, const uint8_t* in, size_t len, uint8_t** reply,
40        size_t* reply_len) {
41    sp<IServiceManager> sm = defaultServiceManager();
42    sp<IBinder> binder = sm->getService(String16(keystore_service_name));
43    sp<IKeystoreService> service = interface_cast<IKeystoreService>(binder);
44
45    if (service == NULL) {
46        ALOGE("could not contact keystore");
47        return -1;
48    }
49
50    auto inBlob = blob2hidlVec(in ,len);
51    hidl_vec<uint8_t> reply_vec;
52    auto ret = service->sign(String16(key_id), inBlob, &reply_vec);
53    if (!ret.isOk()) {
54        return -1;
55    }
56
57    *reply = reply_vec.releaseData();
58    *reply_len = reply_vec.size();
59    return 0;
60}
61
62int32_t KeystoreBackendBinder::get_pubkey(
63        const char *key_id, uint8_t** pubkey, size_t* pubkey_len) {
64    sp<IServiceManager> sm = defaultServiceManager();
65    sp<IBinder> binder = sm->getService(String16(keystore_service_name));
66    sp<IKeystoreService> service = interface_cast<IKeystoreService>(binder);
67
68    if (service == NULL) {
69        ALOGE("could not contact keystore");
70        return -1;
71    }
72
73    hidl_vec<uint8_t> pubkey_vec;
74    auto ret = service->get_pubkey(String16(key_id), &pubkey_vec);
75    if (!ret.isOk()) {
76        return -1;
77    }
78
79    *pubkey = pubkey_vec.releaseData();
80    *pubkey_len = pubkey_vec.size();
81    return 0;
82}
83