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/*
* Copyright 2020, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "android.hardware.security.sharedsecret-impl"
#include <log/log.h>
#include "AndroidSharedSecret.h"
#include "KeyMintUtils.h"
#include <aidl/android/hardware/security/keymint/ErrorCode.h>
#include <keymaster/android_keymaster.h>
namespace aidl::android::hardware::security::sharedsecret {
using keymaster::ComputeSharedHmacRequest;
using keymint::km_utils::kmBlob2vector;
using keymint::km_utils::kmError2ScopedAStatus;
AndroidSharedSecret::AndroidSharedSecret(
const std::shared_ptr<keymint::AndroidKeyMintDevice>& keymint)
: impl_(keymint->getKeymasterImpl()) {}
AndroidSharedSecret::~AndroidSharedSecret() {}
ScopedAStatus AndroidSharedSecret::getSharedSecretParameters(SharedSecretParameters* params) {
auto response = impl_->GetHmacSharingParameters();
params->seed = kmBlob2vector(response.params.seed);
params->nonce = {std::begin(response.params.nonce), std::end(response.params.nonce)};
return kmError2ScopedAStatus(response.error);
}
ScopedAStatus AndroidSharedSecret::computeSharedSecret(const vector<SharedSecretParameters>& params,
vector<uint8_t>* sharingCheck) {
ComputeSharedHmacRequest request(impl_->message_version());
request.params_array.params_array = new keymaster::HmacSharingParameters[params.size()];
request.params_array.num_params = params.size();
for (size_t i = 0; i < params.size(); ++i) {
request.params_array.params_array[i].seed = {params[i].seed.data(), params[i].seed.size()};
if (sizeof(request.params_array.params_array[i].nonce) != params[i].nonce.size()) {
return kmError2ScopedAStatus(KM_ERROR_INVALID_ARGUMENT);
}
memcpy(request.params_array.params_array[i].nonce, params[i].nonce.data(),
params[i].nonce.size());
}
auto response = impl_->ComputeSharedHmac(request);
if (response.error == KM_ERROR_OK) *sharingCheck = kmBlob2vector(response.sharing_check);
return kmError2ScopedAStatus(response.error);
}
} // namespace aidl::android::hardware::security::sharedsecret
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