1 /*
2 * Copyright 2020, 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 <trusty_keymaster/TrustySharedSecret.h>
18
19 #include <aidl/android/hardware/security/keymint/ErrorCode.h>
20 #include <keymaster/android_keymaster.h>
21 #include "KeyMintUtils.h"
22
23 namespace aidl::android::hardware::security::sharedsecret::trusty {
24
25 using keymint::km_utils::kmBlob2vector;
26 using keymint::km_utils::kmError2ScopedAStatus;
27
getSharedSecretParameters(SharedSecretParameters * params)28 ::ndk::ScopedAStatus TrustySharedSecret::getSharedSecretParameters(SharedSecretParameters* params) {
29 auto response = impl_->GetHmacSharingParameters();
30 params->seed = kmBlob2vector(response.params.seed);
31 params->nonce = {std::begin(response.params.nonce), std::end(response.params.nonce)};
32 return kmError2ScopedAStatus(response.error);
33 }
34
computeSharedSecret(const std::vector<SharedSecretParameters> & params,std::vector<uint8_t> * sharingCheck)35 ::ndk::ScopedAStatus TrustySharedSecret::computeSharedSecret(
36 const std::vector<SharedSecretParameters>& params, std::vector<uint8_t>* sharingCheck) {
37 keymaster::ComputeSharedHmacRequest request(impl_->message_version());
38 request.params_array.params_array = new keymaster::HmacSharingParameters[params.size()];
39 request.params_array.num_params = params.size();
40 for (size_t i = 0; i < params.size(); ++i) {
41 request.params_array.params_array[i].seed = {params[i].seed.data(), params[i].seed.size()};
42 if (sizeof(request.params_array.params_array[i].nonce) != params[i].nonce.size()) {
43 return kmError2ScopedAStatus(KM_ERROR_INVALID_ARGUMENT);
44 }
45 memcpy(request.params_array.params_array[i].nonce, params[i].nonce.data(),
46 params[i].nonce.size());
47 }
48
49 auto response = impl_->ComputeSharedHmac(request);
50 if (response.error == KM_ERROR_OK) *sharingCheck = kmBlob2vector(response.sharing_check);
51 return kmError2ScopedAStatus(response.error);
52 }
53
54 } // namespace aidl::android::hardware::security::sharedsecret::trusty
55