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