/*
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**
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** Copyright 2017, 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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#include <keymaster/contexts/keymaster1_passthrough_context.h>
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#include <keymaster/legacy_support/keymaster_passthrough_key.h>
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#include <keymaster/legacy_support/keymaster_passthrough_engine.h>
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#include <keymaster/legacy_support/keymaster1_legacy_support.h>
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#include <keymaster/legacy_support/keymaster1_engine.h>
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#include <keymaster/legacy_support/rsa_keymaster1_key.h>
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#include <keymaster/legacy_support/ec_keymaster1_key.h>
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#include <keymaster/key_blob_utils/software_keyblobs.h>
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#include <keymaster/key_blob_utils/integrity_assured_key_blob.h>
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#include <keymaster/key_blob_utils/ocb_utils.h>
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#include <keymaster/km_openssl/aes_key.h>
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#include <keymaster/km_openssl/hmac_key.h>
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#include <keymaster/km_openssl/attestation_utils.h>
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#include "soft_attestation_cert.h"
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namespace keymaster {
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Keymaster1PassthroughContext::Keymaster1PassthroughContext(keymaster1_device_t* dev)
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: device_(dev), pt_engine_(KeymasterPassthroughEngine::createInstance(dev)),
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km1_engine_(new Keymaster1Engine(dev)) {
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}
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keymaster_error_t Keymaster1PassthroughContext::SetSystemVersion(uint32_t os_version,
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uint32_t os_patchlevel) {
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os_version_ = os_version;
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os_patchlevel_ = os_patchlevel;
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return KM_ERROR_OK;
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}
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void Keymaster1PassthroughContext::GetSystemVersion(uint32_t* os_version,
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uint32_t* os_patchlevel) const {
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if (os_version) *os_version = os_version_;
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if (os_patchlevel) *os_patchlevel = os_patchlevel_;
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}
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KeyFactory* Keymaster1PassthroughContext::GetKeyFactory(keymaster_algorithm_t algorithm) const {
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auto& result = factories_[algorithm];
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if (!result) {
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switch(algorithm) {
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case KM_ALGORITHM_RSA:
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result.reset(new Keymaster1ArbitrationFactory<RsaKeymaster1KeyFactory>(pt_engine_.get(),
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KM_ALGORITHM_RSA, device_, this, km1_engine_.get()));
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break;
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case KM_ALGORITHM_EC:
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result.reset(new Keymaster1ArbitrationFactory<EcdsaKeymaster1KeyFactory>(pt_engine_.get(),
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KM_ALGORITHM_EC, device_, this, km1_engine_.get()));
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break;
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case KM_ALGORITHM_AES:
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result.reset(new Keymaster1ArbitrationFactory<AesKeyFactory>(pt_engine_.get(),
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KM_ALGORITHM_AES, device_, this, this));
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break;
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case KM_ALGORITHM_HMAC:
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result.reset(new Keymaster1ArbitrationFactory<HmacKeyFactory>(pt_engine_.get(),
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KM_ALGORITHM_HMAC, device_, this, this));
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break;
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case KM_ALGORITHM_TRIPLE_DES:
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// Not supported by KM1.
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return nullptr;
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}
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}
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return result.get();
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}
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OperationFactory* Keymaster1PassthroughContext::GetOperationFactory(keymaster_algorithm_t algorithm,
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keymaster_purpose_t purpose) const {
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auto keyfactory = GetKeyFactory(algorithm);
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return keyfactory->GetOperationFactory(purpose);
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}
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keymaster_algorithm_t* Keymaster1PassthroughContext::GetSupportedAlgorithms(
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size_t* algorithms_count) const {
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if (algorithms_count) *algorithms_count = 0;
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return nullptr;
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}
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keymaster_error_t Keymaster1PassthroughContext::UpgradeKeyBlob(
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const KeymasterKeyBlob& key_to_upgrade, const AuthorizationSet& upgrade_params,
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KeymasterKeyBlob* upgraded_key) const {
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UniquePtr<Key> key;
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keymaster_error_t error = ParseKeyBlob(key_to_upgrade, upgrade_params, &key);
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if (error != KM_ERROR_OK)
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return error;
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if (key->hw_enforced().Contains(TAG_PURPOSE) &&
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!key->hw_enforced().Contains(TAG_OS_PATCHLEVEL)) {
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return KM_ERROR_INVALID_ARGUMENT;
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}
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return UpgradeSoftKeyBlob(key, os_version_, os_patchlevel_, upgrade_params, upgraded_key);
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}
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static keymaster_error_t parseKeymaster1HwBlob(const keymaster1_device_t* device,
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const KeymasterKeyBlob& blob,
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const AuthorizationSet& additional_params,
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KeymasterKeyBlob* key_material,
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AuthorizationSet* hw_enforced,
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AuthorizationSet* sw_enforced) {
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keymaster_blob_t client_id = {nullptr, 0};
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keymaster_blob_t app_data = {nullptr, 0};
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keymaster_blob_t* client_id_ptr = nullptr;
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keymaster_blob_t* app_data_ptr = nullptr;
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if (additional_params.GetTagValue(TAG_APPLICATION_ID, &client_id))
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client_id_ptr = &client_id;
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if (additional_params.GetTagValue(TAG_APPLICATION_DATA, &app_data))
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app_data_ptr = &app_data;
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// Get key characteristics, which incidentally verifies that the HW recognizes the key.
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keymaster_key_characteristics_t* characteristics;
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keymaster_error_t error = device->get_key_characteristics(device, &blob, client_id_ptr,
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app_data_ptr, &characteristics);
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if (error != KM_ERROR_OK)
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return error;
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UniquePtr<keymaster_key_characteristics_t, Characteristics_Delete> characteristics_deleter(
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characteristics);
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hw_enforced->Reinitialize(characteristics->hw_enforced);
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sw_enforced->Reinitialize(characteristics->sw_enforced);
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*key_material = blob;
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return KM_ERROR_OK;
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}
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keymaster_error_t Keymaster1PassthroughContext::ParseKeyBlob(const KeymasterKeyBlob& blob,
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const AuthorizationSet& additional_params, UniquePtr<Key>* key) const {
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AuthorizationSet hw_enforced;
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AuthorizationSet sw_enforced;
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KeymasterKeyBlob key_material;
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AuthorizationSet hidden;
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keymaster_error_t error = BuildHiddenAuthorizations(additional_params, &hidden,
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softwareRootOfTrust);
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if (error != KM_ERROR_OK)
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return error;
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// Assume it's an integrity-assured blob (new software-only blob
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error = DeserializeIntegrityAssuredBlob(blob, hidden, &key_material, &hw_enforced, &sw_enforced);
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if (error != KM_ERROR_INVALID_KEY_BLOB && error != KM_ERROR_OK)
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return error;
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if (error == KM_ERROR_INVALID_KEY_BLOB) {
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error = parseKeymaster1HwBlob(km1_engine_->device(), blob, additional_params,
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&key_material, &hw_enforced, &sw_enforced);
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if (error != KM_ERROR_OK) return error;
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}
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// GetKeyFactory
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keymaster_algorithm_t algorithm;
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if (!hw_enforced.GetTagValue(TAG_ALGORITHM, &algorithm) &&
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!sw_enforced.GetTagValue(TAG_ALGORITHM, &algorithm)) {
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return KM_ERROR_INVALID_ARGUMENT;
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}
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auto factory = GetKeyFactory(algorithm);
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return factory->LoadKey(move(key_material), additional_params, move(hw_enforced),
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move(sw_enforced), key);
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}
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keymaster_error_t Keymaster1PassthroughContext::DeleteKey(const KeymasterKeyBlob& blob) const {
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// HACK. Due to a bug with Qualcomm's Keymaster implementation, which causes the device to
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// reboot if we pass it a key blob it doesn't understand, we need to check for software
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// keys. If it looks like a software key there's nothing to do so we just return.
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// Can be removed once b/33385206 is fixed
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KeymasterKeyBlob key_material;
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AuthorizationSet hw_enforced, sw_enforced;
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keymaster_error_t error = DeserializeIntegrityAssuredBlob_NoHmacCheck(
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blob, &key_material, &hw_enforced, &sw_enforced);
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if (error == KM_ERROR_OK) {
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return KM_ERROR_OK;
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}
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error = km1_engine_->DeleteKey(blob);
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if (error == KM_ERROR_INVALID_KEY_BLOB) {
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// Some implementations diagnose invalid keys.
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// However, all care we about is that the key blob, as supplied, is not usable after the
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// call.
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return KM_ERROR_OK;
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}
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return error;
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}
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keymaster_error_t Keymaster1PassthroughContext::DeleteAllKeys() const {
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return km1_engine_->DeleteAllKeys();
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}
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keymaster_error_t Keymaster1PassthroughContext::AddRngEntropy(const uint8_t* buf,
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size_t length) const {
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return device_->add_rng_entropy(device_, buf, length);
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}
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KeymasterEnforcement* Keymaster1PassthroughContext::enforcement_policy() {
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return nullptr;
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}
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keymaster_error_t Keymaster1PassthroughContext::CreateKeyBlob(const AuthorizationSet& key_description,
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const keymaster_key_origin_t origin,
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const KeymasterKeyBlob& key_material,
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KeymasterKeyBlob* blob,
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AuthorizationSet* hw_enforced,
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AuthorizationSet* sw_enforced) const {
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keymaster_error_t error = SetKeyBlobAuthorizations(key_description, origin, os_version_,
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os_patchlevel_, hw_enforced, sw_enforced);
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if (error != KM_ERROR_OK)
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return error;
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AuthorizationSet hidden;
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error = BuildHiddenAuthorizations(key_description, &hidden, softwareRootOfTrust);
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if (error != KM_ERROR_OK)
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return error;
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return SerializeIntegrityAssuredBlob(key_material, hidden, *hw_enforced, *sw_enforced, blob);
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}
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keymaster_error_t Keymaster1PassthroughContext::GenerateAttestation(const Key& key,
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const AuthorizationSet& attest_params, CertChainPtr* cert_chain) const {
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keymaster_error_t error = KM_ERROR_OK;
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keymaster_algorithm_t key_algorithm;
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if (!key.authorizations().GetTagValue(TAG_ALGORITHM, &key_algorithm)) {
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return KM_ERROR_UNKNOWN_ERROR;
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}
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if ((key_algorithm != KM_ALGORITHM_RSA && key_algorithm != KM_ALGORITHM_EC))
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return KM_ERROR_INCOMPATIBLE_ALGORITHM;
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// We have established that the given key has the correct algorithm, and because this is the
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// SoftKeymasterContext we can assume that the Key is an AsymmetricKey. So we can downcast.
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const AsymmetricKey& asymmetric_key = static_cast<const AsymmetricKey&>(key);
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auto attestation_chain = getAttestationChain(key_algorithm, &error);
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if (error != KM_ERROR_OK) return error;
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auto attestation_key = getAttestationKey(key_algorithm, &error);
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if (error != KM_ERROR_OK) return error;
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return generate_attestation(asymmetric_key, attest_params,
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*attestation_chain, *attestation_key, *this, cert_chain);
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}
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keymaster_error_t Keymaster1PassthroughContext::UnwrapKey(
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const KeymasterKeyBlob&, const KeymasterKeyBlob&, const AuthorizationSet&,
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const KeymasterKeyBlob&, AuthorizationSet*, keymaster_key_format_t*, KeymasterKeyBlob*) const {
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return KM_ERROR_UNIMPLEMENTED;
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}
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} // namespace keymaster
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