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/*
* Copyright 2021 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 <hardware/keymaster_defs.h>
#include <keymaster/remote_provisioning_context.h>
#include <cppbor.h>
#include <cstdint>
#include <mutex>
#include <string>
#include <string_view>
#include <vector>
namespace keymaster {
/**
* SoftKeymasterContext provides the context for a non-secure implementation of AndroidKeymaster.
*/
class PureSoftRemoteProvisioningContext : public RemoteProvisioningContext {
public:
explicit PureSoftRemoteProvisioningContext(keymaster_security_level_t security_level);
~PureSoftRemoteProvisioningContext() override = default;
std::vector<uint8_t> DeriveBytesFromHbk(const std::string& context,
size_t numBytes) const override;
std::unique_ptr<cppbor::Map> CreateDeviceInfo() const override;
cppcose::ErrMsgOr<std::vector<uint8_t>>
BuildProtectedDataPayload(bool isTestMode, //
const std::vector<uint8_t>& macKey, //
const std::vector<uint8_t>& aad) const override;
std::optional<cppcose::HmacSha256>
GenerateHmacSha256(const cppcose::bytevec& input) const override;
void SetSystemVersion(uint32_t os_version, uint32_t os_patchlevel);
void SetVendorPatchlevel(uint32_t vendor_patchlevel);
void SetBootPatchlevel(uint32_t boot_patchlevel);
void SetVerifiedBootInfo(std::string_view boot_state, std::string_view bootloader_state,
const std::vector<uint8_t>& vbmeta_digest);
private:
// Initialize the BCC if it has not yet happened.
void LazyInitProdBcc() const;
std::pair<std::vector<uint8_t>, cppbor::Array> GenerateBcc(bool testMode) const;
keymaster_security_level_t security_level_;
std::optional<uint32_t> os_version_;
std::optional<uint32_t> os_patchlevel_;
std::optional<uint32_t> vendor_patchlevel_;
std::optional<uint32_t> boot_patchlevel_;
std::optional<std::string> verified_boot_state_;
std::optional<std::string> bootloader_state_;
std::optional<std::vector<uint8_t>> vbmeta_digest_;
mutable std::once_flag bccInitFlag_;
// Always call LazyInitProdBcc before accessing these values, as they are
// lazy-initialized.
mutable std::vector<uint8_t> devicePrivKey_;
mutable cppbor::Array bcc_;
};
} // namespace keymaster
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