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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.
*/
#pragma once
#include <iostream>
#include <memory>
#include <numeric>
#include <vector>
#include <cppbor.h>
#include <cppbor_parse.h>
#include <aidl/android/hardware/security/keymint/Certificate.h>
#include <aidl/android/hardware/security/keymint/IKeyMintDevice.h>
#include <aidl/android/hardware/security/secureclock/TimeStampToken.h>
#include <aidl/android/hardware/security/sharedsecret/ISharedSecret.h>
#include <keymaster/android_keymaster_messages.h>
namespace keymint::javacard {
using aidl::android::hardware::security::keymint::AttestationKey;
using aidl::android::hardware::security::keymint::Certificate;
using aidl::android::hardware::security::keymint::HardwareAuthToken;
using aidl::android::hardware::security::keymint::KeyCharacteristics;
using aidl::android::hardware::security::keymint::KeyParameter;
using aidl::android::hardware::security::secureclock::TimeStampToken;
using aidl::android::hardware::security::sharedsecret::SharedSecretParameters;
using cppbor::Array;
using cppbor::Bstr;
using cppbor::EncodedItem;
using cppbor::Item;
using cppbor::MajorType;
using cppbor::Map;
using cppbor::Nint;
using cppbor::Tstr;
using cppbor::Uint;
using std::string;
using std::unique_ptr;
using std::vector;
class CborConverter {
public:
CborConverter() = default;
~CborConverter() = default;
std::tuple<std::unique_ptr<Item>, keymaster_error_t>
decodeData(const std::vector<uint8_t>& response);
std::optional<uint64_t> getUint64(const unique_ptr<Item>& item);
std::optional<uint64_t> getUint64(const unique_ptr<Item>& item, const uint32_t pos);
std::optional<SharedSecretParameters>
getSharedSecretParameters(const std::unique_ptr<Item>& item, const uint32_t pos);
std::optional<string> getByteArrayStr(const unique_ptr<Item>& item, const uint32_t pos);
std::optional<string> getTextStr(const unique_ptr<Item>& item, const uint32_t pos);
std::optional<std::vector<uint8_t>> getByteArrayVec(const unique_ptr<Item>& item,
const uint32_t pos);
std::optional<vector<KeyParameter>> getKeyParameters(const unique_ptr<Item>& item,
const uint32_t pos);
bool addKeyparameters(Array& array, const vector<KeyParameter>& keyParams);
bool addAttestationKey(Array& array, const std::optional<AttestationKey>& attestationKey);
bool addHardwareAuthToken(Array& array, const HardwareAuthToken& authToken);
bool addSharedSecretParameters(Array& array, const vector<SharedSecretParameters>& params);
std::optional<TimeStampToken> getTimeStampToken(const std::unique_ptr<Item>& item,
const uint32_t pos);
std::optional<vector<KeyCharacteristics>>
getKeyCharacteristics(const std::unique_ptr<Item>& item, const uint32_t pos);
std::optional<vector<Certificate>> getCertificateChain(const std::unique_ptr<Item>& item,
const uint32_t pos);
std::optional<vector<vector<uint8_t>>> getMultiByteArray(const unique_ptr<Item>& item,
const uint32_t pos);
bool addTimeStampToken(Array& array, const TimeStampToken& token);
std::optional<Map> getMapItem(const std::unique_ptr<Item>& item, const uint32_t pos);
std::optional<Array> getArrayItem(const std::unique_ptr<Item>& item, const uint32_t pos);
std::optional<keymaster_error_t> getErrorCode(const std::unique_ptr<Item>& item,
const uint32_t pos);
private:
/**
* Get the type of the Item pointer.
*/
inline MajorType getType(const unique_ptr<Item>& item) { return item.get()->type(); }
/**
* Construct Keyparameter structure from the pair of key and value. If TagType is ENUM_REP the
* value contains binary string. If TagType is UINT_REP or ULONG_REP the value contains Array of
* unsigned integers.
*/
std::optional<std::vector<KeyParameter>> getKeyParameter(
const std::pair<const std::unique_ptr<Item>&, const std::unique_ptr<Item>&> pair);
/**
* Get the sub item pointer from the root item pointer at the given position.
*/
inline std::optional<unique_ptr<Item>> getItemAtPos(const unique_ptr<Item>& item,
const uint32_t pos) {
Array* arr = nullptr;
if (MajorType::ARRAY != getType(item)) {
return std::nullopt;
}
arr = const_cast<Array*>(item.get()->asArray());
if (arr->size() < (pos + 1)) {
return std::nullopt;
}
return std::move((*arr)[pos]);
}
};
} // namespace keymint::javacard
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